TBA121-5

FM-Sound IF with SCART Switch and Volume Control TBA 121-5 Bipolar IC Features q q q q Outstanding limiting qualities Few external components Integrated de-emphasis resistor Low harmonic distortion factor P-DIP-16 Type TBA 121-5 Ordering Code Q67000-A5137 Package P-DIP-16 Functional Description FM-IF amplifier, consisting in a limiter amplifier with FM demodulator. The AF section contains a SCART-record/playback switch as well as AF output with volume control. The control of the volume is controlled via an analog control input, and the SCART switch is controlled via a switch input. Application Application of the IC is intended in mono TV sets. Circuit Description In its FM section, the component contains an eight stage, symmetrical limiter amplifier with subsequent coincidence demodulator. The AF section contains an analog switch for the SCARTrecording / playback function as well as an analog volume control with AF output. Semiconductor Group 91 06.94 TBA 121-5 Pin Functions Pin No. 1 2 3 4 5 6 Function Ground Limiter amplifier operating point feedback (RF decoupling of IF amplifier with appropriate capacitors is required!) Limiter amplifier operating point feedback and low end (RF decoupling of IF amplifier with appropriate capacitors is required!) IF-amplifier output (emitter follower) IF-amplifier output (emitter follower) Demodulator input with high impedance input and internal 15 kΩ supply resistor (if an LC circuit is used, the Q is determined by the dampi...