HA1137W FM IF SYSTEM 8 FUNCTIONS @ IF Amplifier @ Quadrature Detector @ Low-noise AF Preamplifier @ Delayed AGC Circuit for Tuner Front End @ Tuning Meter Circuit @ Center Meter Circuit Muting (Squelch) Circuit (Operates as input signal decreases) @ Muting (Squelch) Circuit (Operates when detuned) @ AFC Circuit @ Multipath Circuit = FEATURES Exceptional Input Limiting Sensitivity : 15uV typ. @(-3dB point, measured between term. No. 1 and GND) High AM Rejection Ratio : 40dB typ. @(Vin = 60dBu. FM: 400 Hz, 30% mod. AM: 1 kHz, 30% mod.} Low Harmonic Distortion : 0.1% typ. *(When doubly-tuned detector coil is used) * Total harmonic distortion of the HA1137W essencially depends on frequency-phase characteristics of the detec- tor coil. A simple-tuned detector coil is also applicable. GENERAL DESCRIPTION The HITACHI HA1137W is a monolithic integrated circuit developed for the FM IF system in a Hi-Fi stereo tuner set. It includes all those functions necessary for a FM IF housed ina 16-lead, dual-in-line plastic package. The block diagram shows that the input signal is fed to a three-stage FM IF amplifier/limiter configuration and to a three-stage detector for a tuning meter driver. The detector circuit utilizes a double-balanced quadrature FM detector followed by an audio amplifier and a muting (squelch) circuit. The HA1137W's sophisticated muting circuit features a conventional muting circuit as well as a O-volt switch. The = ABSOLUTE MAXIMUM RATINGS (Ta= 25C) (DP-16) High Recovered AF Voltage : 350 mVrms typ. (When doubly-tuned detector coil is used. 100% mod.) Muting Circuit without shock sound : Muting band width +50 kHz typ. (Where Ry95 = 15 kQ) (Muting band width adjustable by changing only one resistor value) Wide Operating Voltage Range : 9V to 14V O-volt switch, utilizing a so-called S-shaped curve of FM detectors, operates sensitively when the receiving frequency is slightly detuned, thus preventing any small shock sound regardless of whether the muting switch is ON and OFF. The HA1137W offers exceptionally high sensitivity and a high AM rejection ratio, permitting it to be easily applied to highty sensitive, selective sets, using a detector coil and doubly-tuned ceramic filter as a coupler between the front end and the IF stage. Item Symbol Rating Unit DC Supply Voltage Vee 14 v Total Power Dissipation Py _ 550 (Ta= 60C) > mW Operating Temperature Topr 20 to+60 C Storage Temperature Tstg 5510+ 125 C 18 HITACHIHA1137W = BLOCK DIAGRAM Ries 2.2k Vec Ls 2.2uH i 8 \ DC Reference Bias Quadrature Ls t Input | t Cres [ome : IF 1 Output Center Meter 7 Antenna ( + 1104A/80028 ) Oca the. Ceramic IF Input \ IF Amplifiers - coco ilters (st. IF 2nd.1 3rd. IF rT is ss s Hy Amp. Amp. Amp. ' ( Ri ' . t ' S330 I Audio Output Can : : | (to MPX IC) 350mVrms/ 0.0474 T 0. { 100% mod. AM FM Ru | 1 etc. Leve Vor omo Det. Muting SW Function L --b ~~-+ F ---- Delayed AGC for Sub- to MPX IC RF Amp. strate c Multipath 109 i Toe (Vertical) Rios 100k B Unit Tuning Meter Ring (2204A/8002 ) CinF a CIRCUIT SCHEMATIC Center Meter HITACHI 19HA1137W ELECTRICAL CHARACTERISTICS (Ta= 25C) Static (DC) Characteristics Item Symbol Test Condition min typ max Unit Terminal 1 (IF Input) vi _ 1.9 _ v Terminal 2 (DC Feedback to Input) V2 _ 1.9 _ v Terminal 3 (DC Bias to Input) v3 See Test Cirevit _ 1.9 _ v Terminal 6 (Audio Output) V6 _ 5.6 _ Vv Terminal 7 (AFC) V7 _ 5.6 _ Vv Terminal 10 (DC Reference) v10 _ 5.6 _ Vv Dynamic Characteristics (Note. 1) Item Symbol Test Condition min typ max Unit Dynamic Circuit Current In Vin= 100dBK, Mute : ON _ 32 39 mA Input Limiting Voltage Vin ( lim) <3 OO uBR ape voltage _ 31 37 dBH Recovered AF Voltage Vocar) 72 92 138 mVrms Total Harmonic Distortion THD _ 0.1 0.3 % Signal-to-noise Ratio (S+N)/N 57 _ _ dB Vin= 100dB # AM Rejection AMR FM: 400Hz, 30% mod _ 45 _ dB AM: 1kHz, 30% mod Muting Sensitivity Vinc MUTE) Vie 1.4V _ 35 _ dBe Output Voltage of Tuning Meter (1) Vis-70 Vin = 70dB # _ 1.5 _ Vv Output Voltage of Tuning Meter (2) Vis100 Vin= 100dB _ 5.7 _ v Muting Band Width BW wute) Vi2=1.4V _ 95 _ kHz Muting Attenuation Mute arr Vs=2V 60 _ _ dB Notes: 1. Unless otherwise noted, supply voltage Vo, = 13V, center 2. Vin is measured at point A noted on the test circuit. Input frequency f= 10.7 MHz, modulation frequency finog = voltage at the IC input terminals (between term No. 1 and 400Hz, input signal voltage Vin = 100dBu, and maximum GND) becomes one-half of Vip. frequency deviation f = 22.5kHz (30% modulation) m TEST CIRCUIT Center 4 Meter . : 0.33, O04 305 db . | i pet ww AC Volt, . i } thy Meter \ HALIS7W & Distortion Meter 0.0la 20k Note) V. for test condition is the voltage of A point. IC input voltage is 4 V... 20 HITACHIHA1137W = PRINTED CIRCUIT BOARD (Bottom View) RECOVERED AF VOLTAGE, NOISE VOLTAGE, MUTING ACTION, TUNER AGC AND AM REJECTION AND TOTAL HARMONIC TUNING METER OUTPUT VS. DISTORTION VS. IF INPUT VOLTAGE (F INPUT VOLTAGE : See test circuit AM! IkHz 30% mod. eet ci POD ew tase) 5 5 : ||| \ | z = 10s 2 4 Van (Mute) <3 2 20 > 3 aw (Signal 3 & = . Meter) V = 2 gu 8 s { a5 t S 2 eS s 3 q LSV Oe e e 3 32 ge E 1.4,----------- | maf \ az 2 e& 1 50 ' : : oP oR 60 % 20 3540 60 70 80 100 120 IF Input Voltage Vi. (dBu) IF Input Voltage V,. (dByu) TERMINAL No. 12 VOLTAGE AND VOLTAGE BETWEEN TERMINAL No. 7 AND No. 10 VS. CHANGE IN FREQUENCY See circuit Vv. Frequency ( } HITACHI 21HA1137W # EXTERNAL COMPONENTS Parts | Recommended influence N Val Purpose Remarks . alue Larger than Recommended Value | Smaller than Recommended Value . Influence of ceramic filter Influence of ceramic filter Rios 3300 Input biasing characteristics characteristics R 2. 2kO Increase in output R.., 5 6kQ Damping of detecting coil Decrease in detector dynamic Decrease in output 104 . range Rios 15k Determination of dV7/df Decrease in muting bandwidth Increse in muting bandwidth R 1500 Current by-pass of center Increase in indicating position Decrease in center meter 08 meter drift of center meter sensitivity 68k, . : fer 100kQ. Pe cane ee signal Poor sensitivity Excessive over sensitivity _ (B-type) Rice xa Prevention of muting errors Error in muting Error in muting . . . . : Error jin mutin Rin 12kQ, Time constant with Cire Delay in muting build up Large pop roe C102 0.047 F . . Use Cros 0.047HF By-poss capacitors of input Oscillation ceramic Cio 0.047KF ampl capacitors By-pass capacitor of . . . . . Choa 0.47KF detected output Delay in AFC build up Decrease in muting bandwidth By-pass capacitor of Increase in THD at low input Cros | 0.0474 F detected output level c 330pF By-pass capacitor of Poor high-frequency characteri- | Increase in THD (crosstalk of ne P detected output stics of audio output internal frequency component Gn 10#F | DC cutting Capacitor Large pop noise during power ON/OF F 22 HITACHI