DC LINE TERMINATION ACT DCT V-
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1 L3845 TRUNK INTERFACE ON CHIP POLARITY GUARD MEETS DC LINE CHARACTERISTICS OF EITHER CCITT AND EIA RS 464 SPECS PULSE FUNCTION HIGH AC IMPEDANCE OFF HOOK-STATUS DETECTION OUTPUT LOW EXTERNAL COMPONENT COUNT DESCRIPTION The circuit provides DC loop termination for analog trunk lines. The -I characteristics is equivalent to a fixed voltage drop (zener like characteristic) in series with an external resistance that determines the slope of the DC characteristic. An external low voltage electrolytic capacitor causes the circuit to exhibit a very high impedance to all AC signal above a minimum frequency that is determined by the capacitor itself and by a 20 K nominal resistor integrated on the chip. The Off-Hook status is detected all the time a typic of 8 ma is flowing into the circuit. In this condition a constant current generator is activated to BLOCK DIAGRAM Minidip SO8 SO20W (12+4+4) ORDERING NUMBERS: L3845B L3845D L supply an external device (typically an optocoupler) without affecting the AC characteristic of the circuit. When Pulse Dialing is required the PULSE input (pin 3) connected to - causes the device to reduce the fixed DC voltage drop and to exhibit a pure resistive impedance equal to the external resistor. IN1 IN2 1 7 POLARITY GUARD DC LINE TERMINATION OF HOOK DETECTION CIRCUIT PULSE HD ACT DCT - R2 R3 S2 S1 C1 R1 D96TL263 September /8 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
2 ABSOLUTE MAXIMUM RATINGS Symbol Parameter alue Unit L Max Line oltage (pulse duration 10 ms max) 20 I L Max Line Current 150 ma P tot Total Power Dissipation at Tamb = 70 C 800 mw T op Operating Temperature 40 to + 70 C T srg, T j Storage and Junction Temperature 55 to C PIN CONNECTION (Top view) SO20 MINIDIP and SO8 PULSE HD IN1 NC NC ACT NC NC + DCT IN2 SO20 IN1 - PULSE HD IN2 DCT ACT DIP8 = the pin is electrically and thermally in good contact with the chip sustrate. Connect to PCB copper tracks, for heat dissipation the tracks shall preferably be electrically connected to pin 20 (internally bonded to the chip substrate) or left floating. A higher track density and/or area assures a Rth j-amb towards the lower limit. THERMAL DATA Symbol Parameter Minidip SO8 SO20 Unit R th j-amb Thermal Resistance Junction-ambient (*) Max to to 70 C/W (*) Mounted on FR4 Boards 2/8
3 DC ELECTRICAL CHARACTERISTICS (IL = 10 ma to 100 ma, R1 = 56 Ω, S1 = Open, Tamb = + 25 C, unless otherwise specified) Symbol Parameter Test Condition Min. Typ. Max. Unit L LP I hn I hf I OUT Line oltage (normal mode) Line oltage (pulse mode) ON/OFF-Hook Line Current Detection Threshold OFF/ON-Hook Line Current Detection Threshold OFF-Hook Output Drive Current at Pin HDO PULSE = Open IL = 10 ma I L = 20 ma I L = 100 ma PULSE = I L = 20 ma I L = 35 ma I L = 80 ma IL = 10 ma I L 20 ma ma ma PM Pulse Input Low oltage 0.8 I PM I NM Pull-up Input Current at Pin PULSE (pulse mode) Imput Current at Pin Pulse (normal mode) ma ma IL = 100 ma 20 µa Pulse = 3 µa AC ELECTRICAL CHARACTERISTICS (IL = 10mA to 100mA, R1 = 56Ω, R2 = 470KΩ, R3 = 130 KΩ, Tamb = + 25 C, unless otherwise specified) Symbol Parameter Test Condition Min. Typ. Max. Unit Z L AC Line Impedance S 1 = Open, S 2 = Open C 1 = 2.2mF 20 KΩ f = 1KHz Sending/Receiving Distortion S 1 = Open, S 2 = Open f = 1KHz AC-L = 775mrms 2 % I L = 15 to 100mA Sending/Receiving Distortion S 1 = Closed; S 2 = Open AC-L = 1.3rms 2 % Sending/Receiving Distortion S 1 = Open; S 2 = Closed AC-L = 1.9rms 2(*) % (*) Not tested, guaranteed only by design. APPLICATION INFORMATION With the use of this circuit it is possible to terminate an analog trunk so that all the DC current component is flowing in the TRUNK TERMINA- TION CIRCUIT while the AC component is decoupled with a low voltage capacitor and can be used with a small and low cost audio coupler transformer to provide the AC balancing termination and two to four wire conversion. Therefore it is usefull both for MODEM and PABX systems. Figure 1 gives the typical application circuit ; it is worth to note that the TRUNK TERMINATION CIRCUIT, together with the LS5018 transient suppressor provides a compact and low cost module fully protected against lightning or overvoltages frequently present on telephone lines. The PULSE input when connected to - allows the device to reduce the Line oltage and to show a resistive impedance equal to R1 to the line. When PULSE input is left open, this function is disable. 3/8
4 Figure 1: Typical Application. 4/8
5 mm inch DIM. MIN. TYP. MAX. MIN. TYP. MAX. A OUTLINE AND MECHANICAL DATA a B b b D E e e e F I L Z Minidip 5/8
6 DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. A a a a b b C c1 45 (typ.) D (1) E e e F (1) L M S 8 (max.) OUTLINE AND MECHANICAL DATA SO8 (1) D and F do not include mold flash or protrusions. Mold flash or potrusions shall not exceed 0.15mm (.006inch). 6/8
7 DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. OUTLINE AND MECHANICAL DATA A A B C D E e H h L K 0 (min.)8 (max.) SO20 L h x 45 A B e K H A1 C D E 1 10 SO20MEC 7/8
8 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners 2003 STMicroelectronics - All rights reserved STMicroelectronics GROUP OF COMPANIES Australia Belgium - Brazil - Canada - China Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States 8/8
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