AN12941A Datasheet, PDF (20/41 Pages) Panasonic Semiconductor – The AN12941A is an amplifier IC for stereo speakers which can output 1 W by 8 Ohm or 2 W by 4 Ohm

AN12941A
■ Application Notes (continued)
3. Main signal on/off change and alarm signal mix circuit block
 Main signal on/off circuit
1) The speaker amplifier section is set to Mute when main signal is off.
2) High: Signal on , Low: Signal off
 Main signal level adjustment
1) The gain of this inverting amplifier can be reduced by adding external resistance in parallel between pin 12
and pin 13 or pin 44 and pin 45.
When addition resistance is set to Rd (kΩ)
Gd =
18 × (9 + Rd)
12.7 × (18 + 9 + Rd)
9 10
8 _VREF
48 47
8 _VREF
Headphone
11
12.7 kΩ
3 dB
AGC
9 kΩ
18 kΩ
12
13 ^{+3 dB}
+9 dB
V_CC
7
Mute
Rd
14
46
Headphone
12.7 kΩ
3 dB
AGC
9 kΩ
18 kΩ
45
44 +3 dB
+9 dB
Rd
43
20
SDC00056AEB