Philips AZ7900 - Page 11

3-3
CS 46 648
TA2120FN – Stereo Headphone Amplifier
Pin Name Direction Description
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1 DBB NF → headphone-amp NF of DBB amplifier
2 ADD OUT headphone-amp → output of ADD amplifier
3 RF IN → headphone-amp terminal for ripple filter circuit
4 PWC → headphone-amp center amplifier on/off switch (open = on)
5 VCC → headphone-amp positive supply voltage
6 B headphone-amp → output of power amplifier
7 C headphone-amp → output of center amplifier
8 A headphone-amp → output of power amplifier
9 GND GND ground of power amplifier
10 MIX OUT headphone-amp → output of power amplifier (mixed)
11 ALC IN → headphone-amp input terminal for ALC detector circuit
12 ALC DET → headphone-amp smoothing for ALC detection (GND = ALC off, open = ALC ON)
13 ATT → headphone-amp power amplifier gain switch (open/VCC = ATT off, GND = ATT on)
14 IN A → headphone-amp input of power amplifier
15 IN B → headphone-amp input of power amplifier
16 GND GND ground of input stage in power amplifier
17 BEEP IN → headphone-amp input terminal for beep sound
18 MUTE TC → headphone-amp terminal for mute smoothing
19 MUTE SW → headphone-amp power mute switch (GND/open = mute off, VCC = mute on)
20 POWER → headphone-amp power switch (VCC = power on, GND/open = power off)
21 BIAS headphone-amp → BIAS voltage
22 BIAS IN → headphone-amp filter terminal for BIAS circuit
23 DBB SW → headphone-amp DBB on/off switch (open/VCC = DBB on, GND = DBB off)
24 DBB OUT headphone-amp → Output of DBB amplifier (terminal for filter)