Semiconductor Group

92

TBA 121-5

Pin Functions

Pin No.

Function

1

Ground

2

Limiter amplifier operating point feedback

(RF decoupling of IF amplifier with appropriate capacitors is required!)

3

Limiter amplifier operating point feedback and low end

(RF decoupling of IF amplifier with appropriate capacitors is required!)

4

IF-amplifier output (emitter follower)

5

IF-amplifier output (emitter follower)

6

Demodulator input with high impedance input and internal 15 k

Ω supply resistor

(if an LC circuit is used, the Q is determined by the damping resistance across

pins 6 and 7)

7

Demodulator input with high impedance input and internal 15 k

Ω supply resistor

(if an LC circuit is used, the Q is determined by the damping resistance across

pins 6 and 7)

8

Connection for de-emphasis capacitor (a series resistor of 11 k

Ω is integrated)

9

AF output of the SCART interface (emitter follower with short circuit limiter)

10

AF input 1 of the SCART interface (IF branch)

11

Rec/Pb switch input

12

AF input 2 of the SCART interface (SCART input)

13

Volume control

14

IF output (emitter follower)

15

+

16

IF input (limiter amplifier input; internal resistor between pin 16 and 3 typ. 800

Ω)