an12949a Panasonic Corporation of North America, an12949a Datasheet - Page 19

• Manufacturer Part Number: an12949a
• Description: Audio Power Ic For Note Pc
• Manufacturer: Panasonic Corporation of North America

AN12949A
Technical Data (continued)
The explanation of the function for mainly
Note) The characteristics listed below are reference values based on the IC design and are not guaranteed.
1. Speaker amplifier
1) Gain of amplifier and input impedance can be set up by the external resistance.
2) LPF to remove the high frequency element for that to be unnecessary by giving the capacity of C1 can compose it.
Total gain of the speaker amplifier is +20 dB when gain of the input amplifier is set up in ±0 dB.
External resistance is made R1, R2.
They are gain = ±0 dB, input impedance = 10 kΩ in the case of R1 = 10 kΩ, R2 = 10 kΩ.
Use R1 and R2 in more than 10 kΩ.
External resistor is made R2. Capacity is made C1. Cutoff frequency is fc.
fc is about 19.4 kHz in the case of R2 = 10 kΩ, C1 = 820 pF.
SP_INL
SP_INR
SP_STBY1 34
SP_STBY2
Gain = 20log(R2/R1)
Zin = R1
fc = 1/(2 p × R2 × C1)
10 kΩ
10 kΩ
35
DC: 0 V
DC: 0 V
AND
29
8
820 pF
10 kΩ
820 pF
10 kΩ
±0 dB
±0 dB
Standby
Control
(Timer)
28
9
SDF00043BEB
AGCL
AGCR
AGC
DET
+14 dB
+14 dB
+14 dB
+14 dB
SP
mute
BTL: +6 dB
BTL: +6 dB
22
23
20
21
14
15
16
17
R1
SP_OUTL –
SP_OUTL +
SP_OUTR –
SP_OUTR +
Pin29
Pin8
Pin29
Pin8
C1
R2
R2
Pin28
Pin9
Pin28
Pin9
19