Le79R101 Ringing Subscriber Line Interface Circuit VoiceChip Family 79R Series

Transcription

1 APPLICATIONS Le79R101 Ringing Subscriber Line Interface Circuit VoiceChip Family 79R Series ORDERING INFORMATION Integrated Access Device (IAD Smart Residential Gateway (SRG Set Top/House Side Box Network Interface Unit (NIU Cable Modem Cable PC Fiber in the Loop (FITL Fiber to the Home (FTTH Wireless Local Loop (WLL Intelligent PBX ISDN TA/NT1 FEATURES Meets UL1950 safety requirements Through sinusoidal ringing with DC offset On-chip ring-trip detector Low standby state power Battery operation: V BAT1 : 15 V to 99 V V BAT2 : 15 V to V BAT1 On-chip battery switching and feed selection On-hook transmission Two-wire impedance set by single external impedance Programmable constant-current feed Programmable Open Circuit voltage Programmable loop-detect threshold Current gain = 1000 Ground-key detector Polarity reversal option available Internal V EE regulator (no external 5 V power supply required Two on-chip relay drivers and snubber circuits RELATED LITERATURE Le79R79/R100/R101 SLIC Evaluation Board User s Guide Le79R79 Ringing SLIC User s Guide Le79R70/79/100/101 Ringing SLIC Technical Overview Le79R100/101 Vs. Le79R79 Device Comparison Brief Le58QL02/021/031 QLSLAC Data Sheet Le58QL061/063 QLSLAC Data Sheet Devices* Le79R1011JC Le79R1012JC Le79R1013JC Le79R1014JC Package 32-pin PLCC Notes: -1: 52 db Longitudinal Balance, Polarity Reversal -2: 63 db Longitudinal Balance, Polarity Reversal -3: 52 db Longitudinal Balance, No Polarity Reversal -4: 63 db Longitudinal Balance, No Polarity Reversal * Legerity reserves the right to fulfill all orders for this device with parts marked with the "Am" part number prefix, until such time as all inventory bearing this mark has been depleted. It should be noted that parts marked with either the "Am" or the "Le" part number prefix are equivalent devices in terms of form, fit, and function. The only difference between the two is in the part number prefix appearing on the topside mark. DESCRIPTION The Le79R101 device is a bipolar monolithic Ringing SLIC device that offers on-chip sinusoidal ringing. The sinusoidal ringing waveform generated through the Le79R101 device has an advantageously low distortion, and satisfies the traditional ringing waveform requirements of small PBX, WLL, and Pairgain applications. The Le79R101 device also offers offset ringing and satisfies most phones that require an offset from ring to tip during ringing. BLOCK DIAGRAM RTRIP1 RTRIP2 A(TIP HPA HPB B(RING VBAT2 VBAT1 Two-Wire Interface Switch Driver Ring-Trip Detector Ground-Key Detector Off-Hook Detector Signal Transmission Power-Feed Controller Relay Driver Relay Driver Input Decoder and Control RYOUT2 RYE RYOUT1 D1 D2 C1 C2 C3 E1 DET RD VTX RSN RREF VRING RDC RDCR RSGL RSGH VCC VNEG BGND AGND/DGND Document ID# Date: Date: May Nov 07, 25, 2002 Rev: ED Version: 12 Distribution: Public Document

2 TABLE OF CONTENTS Applications Features Related Literature Ordering Information Description Block Diagram Product Description Connection Diagram Pin Descriptions Electrical Characteristics Absolute Maximum Ratings Thermal Resistance Electrical Operating Ranges Specifications Transmission Performance Longitudinal Performance Idle Channel Noise Insertion Loss and Four-to-Four-Wire Balance Return Signal Line Characteristics Power Supply Rejection Ratio, Active Normal State Power Dissipation Supply Currents Logic Inputs Logic Output Ring Trip Detector Input Ring Signal Ground-Key Detector Thresholds Loop Detector Relay Driver Output Relay driver schematic SLIC Decoding User-Programmable Components DC Feed Characteristics Ring-Trip Components Test Circuits Le79R101 Test Circuit Application Circuit Line card Parts List Physical Dimensions Pin PLCC Revision Summary Revision B1 to C Revision C to D Revision D1 to D Le79R101 VoiceChip 79R Series Data Sheet

3 PRODUCT DESCRIPTION The Legerity family of subscriber line interface circuit (SLIC products provide the telephone interface functions required throughout the worldwide market. Legerity SLIC devices address all major telephony markets including central office (CO, private branch exchange (PBX, digital loop carrier (DLC, fiber-in-the-loop (FITL, radio-in-the-loop (RITL, hybrid fiber coax (HFC, and cable telephony applications. The Legerity SLIC devices offer support of BORSHT (battery feed, overvoltage protection, ringing, supervision, hybrid, and test functions with features including current limiting, on-hook transmission, polarity reversal, Tip Open, and loop-current detection. These features allow reduction of linecard cost by minimizing component count, conserving board space, and supporting automated manufacturing. The Legerity SLIC devices provide the two- to four-wire hybrid function, DC-loop feed, and two-wire supervision. Two-wire termination is programmed by a scaled impedance network. Transhybrid balance can be achieved with an external balance circuit or simply programmed using a companion Legerity codec, the Le58QL02/021/031/061/063 (QLSLAC device. The Le79R101 device is a bipolar monolithic Ringing SLIC device that offers on-chip sinusoidal ringing. Now designers can achieve significant cost reductions at the system level for reduced-loop applications by integrating the ringing function on chip. Examples of such applications would be ISDN terminal adaptors, fiber-in-the-loop, radio-in-the-loop, hybrid fiber/coax and cable telephony (home-side boxes. The Le79R101 device can provide sufficient voltage to meet the stringent LSSGR five-ringer equivalent specification. Using an appropriate input signal, the Le79R101 device provides a sinusoidal ringing waveform with DC offset. In order to further enhance the suitability of this device in short-loop, distributed switching applications, Legerity has maximized power savings by incorporating battery switching on chip. The Le79R101 device switches between two battery supplies such that in the off-hook (active state, a low battery is used to save power. In order to meet the Open Circuit voltage requirements of fax machines and maintenance termination units (MTU, the SLIC automatically switches to a higher voltage in the on-hook (standby state. Like all of the Legerity SLIC devices, the Le79R101 device supports on-hook transmission, ring-trip detection, programmable loop-detect threshold, and is available with on-chip polarity reversal. The Le79R101 device is a programmable constant-current feed device with two on-chip relay drivers to operate external relays. Several performance grades are available to meet both CCITT and LSSGR requirements, including various longitudinal balance options. This unique device is available in a 100-V bipolar process in a 32-pin PLCC package. Le79R101 VoiceChip 79R Series Data Sheet 3

4 CONNECTION DIAGRAM RYOUT2 VCC VBAT2 BGND B(RING A(TIP RD RYE 5 29 RTRIP1 RYOUT RTRIP2 NC 7 27 HPB VBAT HPA D1 E Pin PLCC RINGIN RDCR C VTX C VNEG DET RSN C1 D2 RREF RSGH RSGL RDC AGND/DGND Note: 1. Pin 1 is marked for orientation. 2. NC = No connect. 4 Le79R101 VoiceChip 79R Series Data Sheet

5 PIN DESCRIPTIONS Pin Names Type Description AGND/DGND Gnd Analog and digital ground A(TIP Output Output of A (TIP power amplifier BGND Gnd Battery (power ground B(RING Output Output of B(RING power amplifier C3 C1 Input Decoder. SLIC control pins. C3 is MSB and C1 is LSB. TTL compatible. D1 Input Relay1 Control. TTL compatible. Logic Low activates the Relay1 relay driver. D2 Input Relay2 Control. (Option TTL compatible. Logic Low activates the Relay2 relay driver. DET Output Switchhook Detector. When enabled, a logic Low indicates that a selected condition is detected. The detect condition is selected by the logic inputs (C3 C1 and E1. The output is open collector with a builtin 15 kω pull-up resistor. E1 Input Ground-Key Enable. (Option A logic High selects the off-hook detector. A logic Low selects the groundkey detector. TTL compatible. HPA Capacitor High-Pass Filter. A(TIP side of high-pass filter capacitor. HPB Capacitor High-Pass Filter. B(RING side of high-pass filter capacitor. RD Resistor Detect Resistor. Detector threshold set and filter pin. RDC Output DC Feed Resistor. Connection point for the DC-feed current programming network. The other end of the network connects to the receiver summing node (RSN. The sign of VRDC is negative for normal polarity and positive for reverse polarity. RDCR Connection point for feedback during ringing. RREF Ringing Reference. Reference voltage for Vring pin. RSGH Input Saturation Guard High. Pin for resistor to adjust Open Circuit voltage when operating from V BAT1. RSGL Input Saturation Guard Low. Pin for resistor to adjust the anti-saturation cut-in voltage when operating from both V BAT1 and V BAT2. RSN Input Receive Summing Node. The metallic current (both AC and DC between A(TIP and B(RING is equal to 1000 x the current into this pin. The networks that program receive gain, two-wire impedance, and feed resistance all connect to this node. RTRIP1 Input Ring-Trip Detector. Ring-trip detector threshold set and filter pin. RTRIP2 Input Ring-Trip Detector. Ring-trip detector threshold offset (switch to V BAT1. For power conservation in any nonringing state, this switch is open. RYE Output Common Emitter of RYOUT1/RYOUT2. Emitter output of RYOUT1 and RYOUT2. Normally connected to relay ground. RYOUT1 Output Relay/Switch Driver. Open collector driver with emitter internally connected to RYE. RYOUT2 Output Relay/Switch Driver. (Option Open collector driver with emitter internally connected to RYE. VBAT1 Battery Battery supply and connection to substrate. VBAT2 Battery Power supply to output amplifiers. Connect to off-hook battery through a diode. VCC Power Positive analog power supply VNEG Power Negative analog power supply. This pin is the return for the internal V EE regulator. VRING Input Ring Signal. Ring signal input with respect R REF. 1 V maximum level 10 kω input impedance to R REF. VTX Output Transmit Audio. This output is proportional to the A (TIP and B (RING metallic AC voltage. VTX also sources the two-wire input impedance programming network. (See two-to-four-wire gain accuracy. Le79R101 VoiceChip 79R Series Data Sheet 5

6 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings Stresses greater than those listed under Absolute Maximum Ratings can cause permanent device failure. Functionality at or above these limits is not implied. Exposure to absolute maximum ratings for extended periods can affect device reliability. Storage Temperature 55 to +150ºC V CC with respect to AGND/DGND 0.4 to +7 V V NEG with respect to AGND/DGND 0.4 V to V BAT2 V BAT1 to GND V BAT2 V BAT1 with respect to AGND/DGND: Continuous 10 ms +0.4 to 104 V +0.4 to 109 V BGND with respect to AGND/DGND: +3 to 3 V A(TIP or B(RING to BGND: Continuous V BAT1 5 to +1 V 10 ms (F = 0.1 Hz V BAT1 10 to +5 V 1 µs (F = 0.1 Hz V BAT1 15 to +8 V 250 ns (F = 0.1 Hz V BAT1 20 to +12 V Current from A (TIP or B (RING ±150 ma RYOUT1, RYOUT2 current 75 ma RYOUT1, RYOUT2 voltage RYE to +7 V RYOUT1, RYOUT2 transient RYE to +10 V RYE voltage (relays off BGND to V BAT1 RYE voltage (relays on BGND to 90 V C3 C1, D2 D1, E1: Input voltage 0.4 V to V CC V ESD Immunity (Human Body Model 1500 V min Maximum power dissipation, continuous, T A = 85º C, No heat sink (see note In 32-pin PLCC package 1.33 W Thermal data: In 32-pin PLCC package θ JA 45º C/W typ Note: Thermal limiting circuitry on chip will shut down the circuit at a junction temperature of about 165 C. Operation above 145 C junction temperature may degrade device reliability. Thermal Resistance The junction to air thermal resistance of the Le79R101 device in a 32-pin PLCC package is 45 C/W. The typical junction to case thermal resistance is 14 C/W. Measured under free air convection conditions and without external heat-sinking. Electrical Operating Ranges Legerity guarantees the performance of this device over commercial (0 to 70 C and industrial ( 40 to 85 C temperature ranges by conducting electrical characterization over each range, and by conducting a production test with single insertion coupled to periodic sampling. These characterization and test procedures comply with section of Bellcore TR-TSY Component Reliability Assurance Requirements for Telecommunications Equipment. Environmental Ranges Ambient Temperature 0 to 70 C Commercial 40 to +85 C extended temperature Ambient Relative Humidity 15 to 85% 6 Le79R101 VoiceChip 79R Series Data Sheet

7 Electrical Ranges V CC V NEG V BAT to 5.25 V 4.75 V to V BAT2 15 to 99 V V BAT2 15 V to V BAT1 AGND/DGND 0 V BGND with respect to AGND/DGND 100 to +100 mv Load resistance on VTX to ground 20 kω minimum R REF 0 to V CC /2 V RING R REF ± 1 V pk SPECIFICATIONS Transmission Performance 1., 4., 2-wire return loss 200 Hz to 3.4 khz (See Figure db 6. Z VTX, analog output impedance 3 20 Ω 1. 0 to +70 C V VTX, analog output offset voltage mv 40 to +85 C Z RSN, analog input impedance 1 20 Ω Overload level, 2-wire and 4-wire, off Active state 2.5 Vpk 2.a hook Overload level, 2-wire On hook, R LAC = 600 Ω, OHT state 0.88 Vrms 2.b THD (Total Harmonic Distortion +3 dbm THD, on hook, OHT state 0dBm, R LAC = 600 Ω 40 db 5. Longitudinal Performance (See Figure 7. Longitudinal to metallic L-T, L-4 balance 200 Hz to 1 khz 1, 3* 52 normal polarity 2, 4 63 reverse polarity 2 54 normal polarity, to +85 C 2, 4 1 khz to 3.4 khz 1, 3* 52 db normal polarity 2, 4 58 reverse polarity 2 54 normal polarity, 40 to +85 C 2, Longitudinal signal generation 4-L 200 Hz to 800 Hz normal polarity 42 Longitudinal current per pin (A or B Active or OHT state marms 4. Longitudinal impedance at A or B 0 to 100 Hz, T A = +25 C 25 Ω/pin Note: * Performance Grade Le79R101 VoiceChip 79R Series Data Sheet 7

8 Idle Channel Noise C-message weighted noise Insertion Loss and Four-to-Four-Wire Balance Return Signal (See Figure 5 and Figure 6. Line Characteristics Phosphometric weighted noise 0 to +70 C to +85 C to +70 C to +85 C 78 Gain accuracy, 4- to 2-wire 0 dbm, 1 khz to 4- wire 4- to 4-wire dbrnc dbmp relative to 1 khz relative to 0 dbm 40 to +85 C 40 to +85 C db µs 3., to +85 C to 0 dbm Group delay 0 dbm, 1kHz 3 1., 4., 6. I L, Loop-current accuracy, Active state I L in constant-current region I L I L 1.085I L R LDC = 1250 Ω, RSGL = short, 20 Bat2 = 35 V ma ma OHT, A and B to ground I A, Pin A leakage, Tip Open state R L = I B, Pin B current, Tip Open state B to ground 26 VA, Standby, ground-start signaling A to 48 V = 7 kω, B to ground = 100 Ω V 4. V B, Open Circuit, Standby state I L, Accuracy, Standby state I L = Resistive feed region 54 I L = , Vbat < 62 R L I L I L 1.2I L ma I L = constant-current region T A = 25 C T A = 40 to +85 C Le79R101 VoiceChip 79R Series Data Sheet

9 Power Supply Rejection Ratio, Active Normal State (V RIPPLE = 100 mvrms Power Dissipation Supply Currents Logic Inputs (Applies to C3 C1, D2 D1, and E1. Logic Output V CC 50 to 3400 Hz V NEG 50 to 3400 Hz db 5. V BAT1 50 to 3400 Hz On hook, Open Circuit state 30 On hook, Standby state 50 On hook, OHT state 180 On hook, Active state 110 Off hook, Active state R L = 300 Ω I CC, On-hook V CC supply current I BAT1, On-hook V BAT1 supply current I BAT2, On-hook V BAT2 supply current Open Circuit state Standby state OHT state Active state-normal Standby state OHT state Active state-normal Open Circuit state Standby state OHT state Active state-normal Active state-normal Description Test Conditions Min Typ Max Unit Note V IH, Input High voltage 2.0 V IL, Input Low voltage 0.8 V I IH, Input High current I IL, Input Low current 400 µa mw ma (DET V OL, Output Low voltage I OUT = 0.8 ma, 15 kω to V CC 0.40 V V OH, Output High voltage I OUT = 0.1 ma, 15 kω to V CC 2.4 Ring Trip Detector Input Ring detect accuracy See ring trip detection equation % Le79R101 VoiceChip 79R Series Data Sheet 9

10 Ring Signal V AB, Ringing Ringload = 1570 Ω Vpk 7. V AB, Ringing offset V RINGIN = 2.5 V V V AB V RINGIN (VRINGIN gain R L = Open circuit V/V Ring input impedance to R REF 10 k Ω Harmonic distortion VRING = 0.65 Vrms, R L = 1570 Ω 3 5 % Off-hook current limit R L = 300 Ω ma 4. Ground-Key Detector Thresholds Loop Detector Ringing source impedance 100 Ω 4. Ground-key current threshold B to ground 11 ma R LTH, Loop-resistance detect Active threshold OHT % 9. I LTH, Loop-current detect threshold Standby Relay Driver Output (Relay 1 and 2 V OL, On voltage (each output I OL = 30 ma V V OL, On voltage (each output I OL = 40 ma I OH, Off leakage (each output V OH = +5 V 100 µa Zener breakover (each output I Z = 100 µa V Zener on voltage (each output I Z = 30 ma 11 RELAY DRIVER SCHEMATIC RYOUT1 RYOUT2 BGND RYE BGND Note: 1. Unless otherwise noted, test conditions are BAT1 = 99 V, BAT2 = 21 V, V CC = +5 V, V NEG = 5 V, R L = 600 Ω, R DC1 = 50 kω, R DC2 = 50 kω, R D = 75 kω, no fuse resistors, C HP = µf, C DC = 1.2 µf, D 1 = D 2 = 1N400x, two-wire AC input impedance (ZSL is a 600-Ω resistance synthesized by the programming network shown below. R SGL = open, R SGH = short to GND, R DCR1 = 15 kω, R DCR2 = 15 kω, C DCR = 10 nf, R RT1 = 833 kω, R RT2 = 42 kω, C RT = 1.0 µf, V REF = 0 V. 10 Le79R101 VoiceChip 79R Series Data Sheet

11 Figure 1. AC Input Impedance Programming Network VTX R T1 = 150 kω R T2 = 150 kω C T1 = 60 pf RSN R RX = 300 kω V RX 2. a. Overload level is defined when THD = 1%. b. Overload level is defined when THD = 1.5%. 3. Balance return signal is the signal generated at V TX by V RX. This specification assumes that the two-wire AC load impedance matches the programmed impedance. 4. Not tested in production. This parameter is guaranteed by characterization or correlation to other tests. 5. This parameter is tested at 1 khz in production. Performance at other frequencies is guaranteed by characterization. 6. Group delay can be greatly reduced by using a Z T network such as that shown in Note 1 above. The network reduces the group delay to less than 2 µs and increases Two-Wire Return Loss. The effect of group delay on linecard performance may also be compensated for by synthesizing complex impedance with the QSLAC or DSLAC device Vpk provides 57 Vrms with a crest factor of 1.4 to a load of 1400 Ω with 2 R F = 100, and R LINE = 70 Ω (1570 Ω. 8. Open Circuit V AB can be modified using RSGH. Longitudinal voltage in OHT state is 30 V limiting V AB to 60 V. 9. R D must be greater than 52 kω. See User-Programmable Components, on page 12. for typical value of R LTH. 10. Conforms to UL1950. SLIC DECODING (DET Output State C3 C2 C1 Two-Wire Status E1 = 1 E1 = 0 Battery Open Circuit Ring trip Ring trip VBAT Ringing Ring trip Ring trip VBAT Active Loop detector Ground key VBAT On-hook TX (OHT Loop detector Ground key VBAT Reserved Loop detector Ground key VBAT Standby Loop detector Ground key VBAT1 6* Active Polarity Reversal Loop detector Ground key VBAT2 7* OHT Polarity Reversal Loop detector Ground key VBAT1 Note: * Only 1 and 2 performance grade devices support polarity reversal. Le79R101 VoiceChip 79R Series Data Sheet 11

12 USER-PROGRAMMABLE COMPONENTS Z T = 500( Z 2WIN 2R F Z RX Z L 1000 Z T = G 42L Z T + 500( Z L + 2R F 2500 R DC1 + R DC2 = R DCR1 + R DCR2 I LOOP = I RINGLIM C DC 19 ms R DC1 + R DC2 = R DC1 R DC2 R DCR1 + R DCR2 C DCR = µs R DCR1 R DCR2 Z T is connected between the VTX and RSN pins. The fuse resistors are R F, and Z 2WIN is the desired 2-wire AC input impedance. When computing Z T, the internal current amplifier pole and any external stray capacitance between VTX and RSN must be taken into account. Z RX is connected from V RX to R SN. Z T is defined above, and G 42L is the desired receive gain. R DC1, R DC2, and C DC form the network connected to the RDC pin. I LOOP is the desired loop current in the constant-current region. R DCR1, R DCR2, and C DCR form the network connected to the RDCR pin. See Applications Circuit for these components. C DCR sets the ringing time constant, which can be between 15 µs and 150 µs. Loop-Threshold Detect Equations Active and OHT state R LTH R D = Standby state V BAT1 8 R LTH = R 915 D 400 2R F V BAT1 > 62 V 54 R LTH = R 875 D 400 2R F V BAT1 > 62 V Ring-Trip Detection Equation R D is the resistor connected from the RD pin to GND and R LTH is the loop-resistance threshold between onhook and off-hook detection. R D should be greater than 52 kω to guarantee detection occurs in the Standby state. Choose the value of R D for high battery state; then use the equation for R LTH to find where the threshold is for low battery. This equation shows at what resistance the standby threshold is; it is actually a current threshold rather than a resistance threshold, which is shown by the Vbat dependency. V I BAT1 1 RTD = I OFFSET 325 R RT1 I OFFSET = 8 µa for ON transition I OFFSET = 20 µa for OFF transition 12 Le79R101 VoiceChip 79R Series Data Sheet

13 DC FEED CHARACTERISTICS (See note V APPH OHT State Anti-Sat V AB (Volts 40 4 V ASH 30 1 Constant-Current Region 20 3 V APPL Active State Anti-Sat 2 V ASL 10 Note: 0 I L (ma 30 Figure 2. Typical V AB vs. I L DC Feed Characteristics Constant-current region: V AB = I L R L = R L ; where R L = R L + 2R F RDC 2. Active state Anti-sat region: 61.44( R SGL V ASL = ; R SGL where R SGL = open is default setting where R SGL = resistor to GND. VASL increase. V APPL = V ASL I LOOPL = V APPL ( R DC1 + R DC R F + R LOOP OHT state Anti-sat region: V ASH = V ASHH + V ASL V ASH = ( R SGH ; R SGH 3 where R SGH = resistor to GND, R SGH = 0 is default setting. where R SGH = open, V ASH decrease. V APPH = V ASH I LOOPH = V APPH ( R DC1 + R DC R F + R LOOP 600 Le79R101 VoiceChip 79R Series Data Sheet 13

14 RING-TRIP COMPONENTS R RT2 = 42 kω C RT = 1.0 µf V BAT1 R RT1 = 300 CF ( R LRT R F V BAT1 3.5 ( 15 µa 300 CF ( R LRT R F where R LRT = Loop-detection threshold resistance for ring trip and CF = Crest factor of ringing signal ( Figure 3. Input via Output of Sinusoidal with DC Offset V RING R Ref Vbat/2 Figure 4. Feed Programming A (TIP a RSN R L I L SLIC R DC1 b R DC2 C DC B (RING RDC Feed current programmed by R DC1 and R DC2 14 Le79R101 VoiceChip 79R Series Data Sheet

15 TEST CIRCUITS Figure 5. Two-to-Four-Wire Insertion Loss ATIP VTX R L 2 SLIC V L V AB R T AGND R L 2 R RX B(RING RSN I L2-4 = 20 log(v TX / V AB Figure 6. Four-to-Two-Wire Insertion Loss and Four-to-Four-Wire Balance Return Signal ATIP VTX SLIC V AB R L AGND R T R RX B(RING R SN I L4-2 = 20 log(v AB / V RX V RX BRS = 20 log(v TX / V RX Figure 7. Longitudinal Balance 1 << ωc R L S1 C R L 2 ATIP SLIC VTX V L V AB AGND R T V L R L 2 B(RING R SN S2 R RX S2 Open, S1 Closed L-T Long. Bal. = - 20 log(v AB / V L S2 Closed, S1Open 4-L Long. Sig. Gen. = 20 log(v L / V RX V Le79R101 VoiceChip 79R Series Data Sheet 15

16 Figure 8. Two-Wire Return Loss Test Circuit Z D ATIP VTX R SLIC R T1 V S R V M Z IN AGND R T2 C T1 Z D : The desired impedance; eg., the characteristic impedance of the line B(RING RSN R RX Return loss = 20 log (2V M / V S Figure 9. Loop-Detector Switching V CC 6.2 kω A(TIP DET R L = 600 Ω 15 pf B(RING E1 Figure 10. Ground-Key Switching A(TIP B(RING RG 16 Le79R101 VoiceChip 79R Series Data Sheet

17 Figure 11. RFI Test Circuit L 1 200Ω C 1 RF 1 A 50Ω HF GEN 1.5 Vrms 80% Amplitude Modulated 100 khz to 30 MHz 50Ω L 2 200Ω C 2 50Ω RF 2 C AX 33nF C BX 33nF B VTX SLIC under test Le79R101 VoiceChip 79R Series Data Sheet 17

18 LE79R101 TEST CIRCUIT +5 V -5 V C RT 1.0 µf A(TIP B(RING R RT2 42 kω C AX 2.2 nf C HP R RT1 833 kω 18 nf RTRIP1 RTRIP2 A(TIP HPA HPB B(RING Le79R101 VCC VNEG RD RSGH RSGL VTX RSN R T R D 75 kω R SGH short R RX 300 kω 300 kω RSGL open V TX V RX C BX 2.2 nf RDC R DC1 50 kω R DC2 50 kω RDCR2 15 kω C DC RYOUT1 RYOUT2 RYOUT1 RYOUT2 RDCR C DCR R DCR1 15 kω 10 nf RYE RYE BAT1 BAT2 D1 D2 0.1 µf 0.1 µf VBAT1 VBAT2 C1 C2 C3 D1 D2 E1 DET C1 C2 C3 D1 D2 E1 DET BGND VRING RREF See note below. AGND/ DGND BATTERY GROUND ANALOG GROUND DIGITAL GROUND Note: The input should be sinusoidal with less than ± 1 V peak amplitude. 18 Le79R101 VoiceChip 79R Series Data Sheet

19 APPLICATION CIRCUIT +5 V -5 V C RT 1.0 µf RFA = 50 Ω TIP BAT1 RING RFB = 50 Ω U2 U3 RYOUT1 RYOUT2 D3 D4 R RT2 42 kω CBX = 2.2 nf R RT1 715 kω C AX = 2.2 nf C HP 18 nf RTRIP1 RTRIP2 A(TIP HPA HPB B(RING RYOUT1 RYOUT2 U1 Le79R101 VCC VNEG RD RSGH RSGL VTX RSN RDC RDCR R T2 R DC1 R D 66 kω R T1 C T 50 kω R DCR1 15 kω R DC2 50 kω R SGH short 125 kω 125 kω C DC 820 nf C DCR 10 nf R RX 250 kω RSGL R DCR2 15 kω open V TX V RX RYE RYE BAT1 BAT2 D1 D2 0.1 µf 0.1 µf VBAT1 VBAT2 C1 C2 C3 D1 D2 E1 DET C1 C2 C3 D1 D2 E1 DET VRING See note below. BGND RREF AGND/ DGND BATTERY GROUND Assumptions: 1. Vring is 0.65 Vrms for 65 Vrms ringing ma I LOOP ma Ringing Current Limit KΩ Ω Ω High Battery Loop Threshold Ringing Loop Threshold Two-wire Impedance, 600 Ω Z L 7. G 42L = V BAT1, -24 V BAT2 ANALOG GROUND DIGITAL GROUND Note: The input should be sinusoidal with less than ± 1 V peak amplitude. U2, U3 - TECCOR BATTRAX P1001SC protector or TISP61089AD from Power Innovation. For battery voltages below 80 V, see Le79R79 for alternate protection. D3, D4: 1A, 100 V Le79R101 VoiceChip 79R Series Data Sheet 19

20 LINE CARD PARTS LIST The following list defines the parts and part values required to meet target specification limits for only one channel of the application circuit. Item Quantity Type Value Tol. Rating Comments C AX, C BX 2 Capacitor (X7R 2200 pf 20% 100 V EMI Suppression C DC 1 Capacitor (X7R 820 nf 20% 16 V Application dependent C DCR 1 Capacitor (X7R 10 nf 20% 16 V Application dependent C HP 1 Capacitor (X7R 18 nf 20% 100 V DC/AC seperation C RT 1 Capacitor (X7R 1 µf 10% 16 V Set ring trip RC constant C T 1 Capacitor (X7R 68 pf 10% 16 V Application dependent Battery Decoupling 2 Capacitor (X7R 100 nf 20% 100 V VBAT1 dependent D 3, D 4 2 Diode 1N400X 1 A 100 V D 1, D 2 2 Diode 100 ma 100 V 50 ns R D 1 Resistor 66 kω 1% 1/10 W Set loop detect threshold R DC1, R DC2 2 Resistor 50 kω 1% 1/10 W Set loop current Iimit R DCR1, R DCR2 2 Resistor 15 kω 1% 1/10 W Set ringing current limit R RX 1 Resistor 250 kω 1% 1/10 W Set 4W/2W gain R T1, R T2 2 Resistor 125 kω 1% 1/10 W Program termination impedance R RT1 1 Resistor 715 kω 1% 1/10 W Set ring trip threshold R RT2 1 Resistor 42 kω 1% 1/10 W Set ring trip RC constant R FA, R FB 1 Hybrid 50 Ω x 2 1% MMC 9935 RSLIC 1 Le79R101 U2, U3 2 Sidactor P100 ISC or TISP 61089AD Note: The BOM above is based on balanced ringing. Additional decoupling capacitor on V CC may be required. For the reference design, please contact Legerity s applications department. 20 Le79R101 VoiceChip 79R Series Data Sheet

21 PHYSICAL DIMENSIONS 32-Pin PLCC Le79R101 VoiceChip 79R Series Data Sheet 21

22 REVISION SUMMARY Revision B1 to C Updated Loop-Threshold Detect Equation for V BAT1 > 62 V and for V BAT1 < 62 V. Updated Physical Dimensions graphic. Updated Copyright, Sales Offices Listing pages. Revision C to D1 Updated document to new format. Updated "Am" OPNs (Ordering Part Numbers to "Le" throughout document. The following changes were made to the "Ordering Information" section: Removed chip graphic Added entries for Le79R1011JC, Le79R1012JC, Le79R1013JC and Le79R1014JC Added notes Standardized notes in "Absolute Maximum Ratings" section. In "Thermal Management Equations", IL > 5 ma, deleted the last sentence in the Description section. In the "Programmable Components" section, updated equations for R LTH. Removed VSU pin from the Le79R101 test and application circuit graphics. Added Line card Parts List. Updated 32-Pin PLCC physical dimensions graphic. Revision D1 to D2 Made formatting and branding updates. 22 Le79R101 VoiceChip 79R Series Data Sheet

23 The contents of this document are provided in connection with Legerity, Inc. products. Legerity makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to specifications and product descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this publication. Except as set forth in Legerity's Standard Terms and Conditions of Sale, Legerity assumes no liability whatsoever, and disclaims any express or implied warranty, relating to its products including, but not limited to, the implied warranty of merchantability, fitness for a particular purpose, or infringement of any intellectual property right. Legerity's products are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant into the body, or in other applications intended to support or sustain life, or in any other application in which the failure of Legerity's product could create a situation where personal injury, death, or severe property or environmental damage may occur. Legerity reserves the right to discontinue or make changes to its products at any time without notice Legerity, Inc. All rights reserved. Trademarks Legerity, the Legerity logo and combinations thereof, and VoiceChip are trademarks of Legerity, Inc. Other product names used in this publication are for identification purposes only and may be trademarks of their respective companies.

24 TM 4509 Freidrich Lane Austin, Texas Telephone: ( Fax: ( North America Toll Free: ( To find the Legerity Sales Office nearest you, visit our website at: or To download or order data sheets, application notes, or evaluation tools, go to: For all other technical inquiries, please contact Legerity Tech Support at: or call