UNISONIC TECHNOLOGIES CO., LTD FM IF DETECTOR IC FOR CORDLESS TELEPHONE DESCRIPTION The UTC UA336 is a low operation voltage FM IF detector IC that includes an Oscillator, Mixer, Limiting Amplifier, Quadrature Detector and Noise Detector, it is suitable for cordless telephone. FEATURES * Low operation voltage: V CC =.8 ~ 5.5V * Excellent temperature characteristics * High sensitivity 2dB sensitivity: dbµv EMF (Input 50Ω) * High intercept point: 96dBµV (Input 50Ω) * Quadrature detector, both ceramic and coil discriminators are usable. * Builtin 2nd MIX Operating frequency: 0 ~ 00MHz * Builtin noise detection circuit * RSSI function Leadfree: UA336L Halogenfree: UA336G ORDERING INFORMATION Ordering Number Normal Lead Free Halogen Free Package Packing UA336P6R UA336LP6R UA336GP6R TSSOP6 Tape Reel UA336P6T UA336LP6T UA336GP6T TSSOP6 Tube of Copyright 2008 Unisonic Technologies Co., Ltd
PIN DESCRIPTION (The values of resistor and capacitor are typical.) PIN No. PIN NAME FUNCTION INTERNAL EQUIVALENT CIRCUIT VOLTAGE OSC IN 2 OSC OUT Local oscillator input and output terminals. Colpitts oscillator is formed by internal emitter follower and external X tal. And external injection is possible from pin 2 or pin. 2 22kΩ 20μA 6pF MIX.98.33 3 MIX OUT MIX output terminal. Output impedance is around.8kω. 200μA.6kΩ 3 0.74 4 V CC Power supply 2.0 5 IF IN 6 DEC 2nd IF input and decoupling for bias. Input impedance is around.8kω. 5 6 90Ω 90Ω 33kΩ 0μA.67.67 INVERTER AMP input and 7 FIL OUT output terminals. 20μA BPF is composed of external 30pF 0.67 capacitors and resistors. 8 7 Connected internally to 500Ω 8kΩ 00Ω 8 FIL IN rectifier circuit by coupling capacitor. 0.65 9 AF OUT Demodulate signal output terminal. Carrier leak is small as LPF is builtin. Output impedance is around 360Ω. 00μA 330Ω 9 0 QUAD Phase shift signal input terminal of FM demodulator. 0 500Ω 2.0 UNISONIC TECHNOLOGIES CO., LTD 2 of
PIN DESCRIPTION (Cont.) PIN No. PIN NAME FUNCTION INTERNAL EQUIVALENT CIRCUIT VOLTAGE 00Ω IF OUT Output terminal of IF AMP..4 200μA 2 RSSI This terminal outputs DC level according to input signal level to IF AMP. Dynamic range is around 70dB. 56kΩ 2 3 NDET The result of noise detection is output by comparing output voltage of NREC terminal with internal reference. Hysteresis range is about 00mV and output is open collector. 3 4 NREC After output of INVERTER AMP amplified around 20dB, noise signal is rectified by external capacitor. 75kΩ NOISE COMP 4 5 GND GND terminal. 0.0 6 MIX IN st IF signal input terminal. Input impedance is around 4kΩ at 2.7MHz. 0 5kΩ 30pF 00μA 5kΩ 2kΩ 0.94 UNISONIC TECHNOLOGIES CO., LTD 3 of
BLOCK DIAGRAM NOISE DET RSSI OUT MIX IN + MIX IN 6 GND 5 NREC 4 NDET 3 RSSI 2 CD IF OUT QUAD 0 AF OUT 9 LPF DE EMP BPF 300Hz ~ 3kHz AF OUT MIX NOISE COMP RSSI QUADRATURE DETECTOR BUFFER RECTIFIER NOISE AMP LOCAL OSC IF AMP INVERTER AMP OSC IN 2 3 4 OSC OUT MIX OUT VCC 5 IF IN 6 DEC 7 8 FIL OUT FIL IN X'tal CF + UNISONIC TECHNOLOGIES CO., LTD 4 of
ABSOLUTE MAXIMUM RATINGS (Ta = 25 ) PARAMETER SYMBOL RATINGS UNIT Supply Voltage V CC 7 V Power Dissipation P D 560 mw Junction Temperature T J 25 Operating Temperature T OPR 30 ~ +85 Storage Temperature T STG 50 ~ +50 Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. ELECTRICAL CHARACTERISTICS (V CC = 2.0V, f IN (MIX) = 2.7MHz, f IN (IF) = 450kHz, f = ±.5kHz, f MOD = khz, Ta= 25 C, unless otherwise specified.) PARAMETER TEST SYMBOL CIRCUIT TEST CONDITIONS MIN TYP MAX UNIT Power Supply Voltage V CC.8 2.0 5.5 V Noise Detection Output Voltage V NDET 2 I SINK = 0.2mA 0. 0.5 V Noise Detection Level High V TH 0.5 0.7 2 Low V TL 0.3 0.4 V RSSI Output Voltage V RSSI 2 V IN(IF) = 30dBµV 200 360 520 mv V CC = 3V V RSSI 2 2 V IN(IF) = 00dBµV.4 2.0 2.6 V Demodulation Output Level V OD 2 V IN (IF) = 80dBµV 80 00 20 mv Current Consumption I Q 3.2 4.6 ma Noise Detection Output Leak Current I O(LEAK) V NREC = 0.6V, V NDET = 2V 0 5 µa IF AMP. Input Resistance R IN(IF).2.8 2.4 kω Mixer Output Resistance R O(MIX).2.8 2.4 kω Mixer Input Impedance R IN (MIX) 5.5 kω C IN (MIX) 2.8 pf SN Ratio SN 2 V IN (IF) = 80dBµV 43 65 db Rejection Ratio RR 2 V IN (IF) = 80dBµV, AM = 30% 40 db Mixer Conversion Gain G VC 2 Measured via ceramic filter. V IN (MIX) = 46dBµV 5 8 2 db Mixer Intercept Point P IM Input 50Ω 96 dbµv 2dB Sensitivity 2dB SN dbµv Note: All AC levels are indicated by open lever (EMF). UNISONIC TECHNOLOGIES CO., LTD 5 of
FUNCTION DISCRIPTION. Local oscillator external injection method Figure and Figure 2 show external injection from pin 2 or pin is possible. In both case, the level at PIN 2 is between 95dBµV and 00dBµV. When Local oscillator injected from PIN, then the input frequency is increased, the level on pin 2 may not be sufficient, causing a decrease in sensitivity. In such a case, add resistor R 5. A builtin BUFFER amp. minimizes leakage from the mixer. kω flo 2 flo R5 2 BUFFER MIX Figure Figure 2 2. Overtone oscillation The basic configuration of the local oscillation circuit using overtone oscillation is showed as Fig 3. The C 5 and L tuning circuits prevent crystal fundamental oscillation. Therefore, set C 5 and L to inductive at the fundamental frequency and capacitive at the overtone frequency. Since the level at pin 2 may decrease and the sensitivity may fall at high frequency as with external injection, adjust the oscillation level using R 5. X'tal C3 C2 2 C5 L R5 Figure 3 3. Detection circuit Detection stage is quadrature method. Both ceramic and coil discriminator are suitable. The case of using coil is shown in Figure 4, in this case, L and C0 composing a phase shifter, demodulation output V OD is about 80mVrms. V OD will be increased as raising damping resistance R6. Center frequency f 0 and demodulation output depends largely on phase shifter and C 7. For C 7 and C 0 use a capacitor with good temperature characteristics. Detector is ceramic discriminator on reference application. UNISONIC TECHNOLOGIES CO., LTD 6 of
FUNCTION DISCRIPTION(Cont.) 4. INVERTER AMP usage Figure 5 shows the INVERTER AMP can be used to from a band pass filter. Set constants as in equations () ~ (3). However, because a low pass filter and a high pass filter are built in, it is recommended that center frequency f 0 be about 30kHz. LPF (fc 47kHz) HPF (fc 25kHz) (2) G V = R 3 / 2R 4 9 8 7 R3 at R 4 R p Example R 3 = 50kΩ, R 4 = 330kΩ, R 5 = 3.3kΩ, R p = 20kΩ (VR) C = 220pF provide; f 0 3kHz, G V 3dB Q 2 Rp R4 C R5 Figure 5 C UNISONIC TECHNOLOGIES CO., LTD 7 of
TEST CIRCUIT fin (MIX) 2.7MHz 000pF 5Ω 6 MIX IN VTH H VTH L 5 GND V VNDET V V VCC 0.2mA 000pF 0.μF 4 3 2 NREC NDET RSSI VRSSI VRSSI 2 0μF IF OUT + 9pF 0 CD QUAD VCC.5kΩ 9 AF OUT DE EMP + BPF 300Hz ~ 3kHz VOD SN AMR V UTC UA336 OSC IN OSC OUT MIX OUT VCC IF IN DEC FIL OUT FIL IN 2 3 4 5 6 7 8 39pF 50kΩ 2.25MHz 56pF 0μF + VCC 0.μF 0.μF 220pF 220pF 0kΩ CFU450G SW 0.μF 5.6kΩ VN 3kHz SW : GVC Measurement Others b a a V GVC b 5Ω fin (IF) 450kHz UNISONIC TECHNOLOGIES CO., LTD 8 of
TYPICAL APPLICATION CIRCUIT NOISE DET RSSI OUT MIX IN L 2.2μH C3 22pF C 000pF C9 0.μF R7 00kΩ C2 + 0μF C8 000pF CD : CDB450C24 (MURATA) CD C7 9pF R6.5kΩ DE EMP BPF 300Hz ~ 3kHz AF OUT MIX IN 6 GND 5 NREC 4 NDET 3 RSSI 2 IF OUT QUAD 0 AF OUT 9 LPF MIX NOISE COMP RSSI QUADRATURE DETECTOR BUFFER RECTIFIER NOISE AMP 4700pF LOCAL OSC IF AMP INVERTER AMP 2 3 4 5 6 7 8 OSC IN OSC OUT MIX OUT VCC IF IN DEC FIL OUT FIL IN X'tal 2.25MHz C2 39pF C3 CF 56pF C5 R3 C4 220pF 50kΩ 0.μF C + C0 R5 0μF 0.μF 3.3kΩ C6 220pF R4 330kΩ VR 0kΩ CF : CFW450G (MURATA) UNISONIC TECHNOLOGIES CO., LTD 9 of
TYPICAL CHARACTERICS Mixer Conversion, GVC (db) Demodllation Output Level, VOP (db) 2dB Sensitivity (dbμv EMF) Current Consumption, IQ (ma) Mixer Conversion, GVC (db) IN COIL DISCRIMINATER USED Rssi Output Voltage, VRSSI (V) Rssi Output Voltage, VRSSI (V) UNISONIC TECHNOLOGIES CO., LTD 0 of
IN COIL DISCRIMINATER USED (Cont.) Noise Detection Characteristics Noise Detection Frequency Characteristics N Rec Output Voltage (V).6.2 0.8 0.4 0 0 VCC = 2V fin = 3kHz N REC N DET 0. 0.2 0.3 0.4 0.5 Filter Amp Input Level, VIN (mv) 3.0 2.0.0 0 N Det Output Voltage (V) Noise Detector Sensitivity (mv) 000 500 00 50 0 5 0.5 0. 220pF 7 8 50kΩ 5.6kΩ 5 0 50 Input Frequency, fin (khz) 220pF 0kΩ VIN VIN level is measured when NDET (pin 3)output changes. 00 UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD of