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INTEGRATED CIRCUITS DATA SHEET TDA3857 Quasi-split sound processor with two FM demodulators Product specification File under Integrated Circuits, IC02 June 1994 Philips Semiconductors Product specification Quasi-split sound processor with two FM demodulators FEATURES · Quasi-split sound processor for all FM standards e. g. B/G TDA3857 · Reducing of spurious video signals by tracking function and AFC for the vision carrier reference circuit; (recommended for NICAM) · Automatic muting of the AF2 signal by the input level · Stereo matrix correction · Layout-compatible with TDA3856 (24 pins) and TDA3858 (32 pins). GENERAL DESCRIPTION Symmetrical IF inputs. Gain controlled wideband IF amplifier. AGC generation due to peak sync. Reference amplifier for the regeneration of the vision carrier. Optimized limiting amplifier for AM suppression in the regenerated vision carrier signal and 90° phase shifter. Intercarrier mixer for FM sound, output with low-pass filter. Separate signal processing for 5.5 and 5.74 MHz intercarriers. Wide supply voltage range, only 300 mW power dissipation at 5 V. QUICK REFERENCE DATA SYMBOL VP IP Vi IF Vo AF THD S/N (W) supply voltage (pin 19) supply current IF input sensitivity (-3 dB) audio output signal (RMS value) total harmonic distortion weighted signal-to-noise ratio PARAMETER MIN. 4.5 - - - - - TYP. 5 60 70 1 0.5 68 MAX. 8.8 72 100 - - - UNIT V mA µV V % dB ORDERING INFORMATION PACKAGE EXTENDED TYPE NUMBER TDA3857 Note 1. SOT 146-1; 1996 November 28. PINS 20 PIN POSITION DIL MATERIAL plastic CODE SOT146(1) June 1994 2 Philips Semiconductors Product specification Quasi-split sound processor with two FM demodulators TDA3857 Fig.1 Block diagram (standard B/G). June 1994 3 Philips Semiconductors Product specification Quasi-split sound processor with two FM demodulators PINNING SYMBOL FMIF1 CAGC MATR FM2R1 FM2R2 AF2 AF1 FM1R1 FM1R2 VC-R1 VC-R2 TRACK FM1I CAF1 ICO CAF2 FM2I GND VP FMIF2 PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 DESCRIPTION IF difference input 1 for B/G standard (38.9 MHz) charge capacitor for AGC input for stereo matrix correction reference circuit for FM2 (5.74 MHz) reference circuit for FM2 (5.74 MHz) AF2 output (AF out of 5.74 MHz) AF1 output (AF out of 5.5 MHz) reference circuit for FM1 (5.5 MHz) reference circuit for FM1 (5.5 MHz) reference circuit for the vision carrier (38.9 MHz) reference circuit for the vision carrier (38.9 MHz) DC output level for tracking intercarrier input for FM1 (5.5 MHz) DC decoupling capacitor for FM1 demodulator (AF1) intercarrier output signal (5.5/5.74 MHz) DC decoupling capacitor for FM2 demodulator (AF2) intercarrier input for FM2 (5.74 MHz) ground (0 V) +5 to +8 V supply voltage IF difference input 2 for B/G standard (38.9 MHz) TDA3857 Fig.2 Pin configuration. June 1994 4 Philips Semiconductors Product specification Quasi-split sound processor with two FM demodulators FUNCTIONAL DESCRIPTION The quasi-split sound processor is suitab