AK4560A Datasheet, PDF (36/47 Pages) Asahi Kasei Microsystems – 16bit CODEC with ALC and MIC/HP/SPK-Amps

ASAHI KASEI
[AK4560A]
n SPEAKER BLOCK
The output signal from analog volume is converted into a monaural signal, its signal is input to speaker-Amp via ALC2
circuit. This speaker-Amp is a monaural output by BTL, can be output to maximum 80mW at 8Ω. (Refer to Figure 26)
Speaker Blocks (MOUT, ALC2 and Speaker-Amp) can be powered ON/OFF by controlling SPKP bit.
When SPKP bit is “0”, MOUT, SP0 and SP1 pins go Hi-z. (Refer to Figure 28)
When SPPS bit is “0”, Speaker-Amp becomes Power-Save-Mode. (Refer to Figure 27)
Then SP0 pin goes Hi-z and SP1 pin is output to SVDD/2 via R1 (typ.100k Ω).
When PD pin changes from “L” to “H” after power-up, SP0 and SP1 pins become Power-Save-Mode. In Power-Save-
Mode, SP0 and SP1 pins gradually become HVCM voltage via an internal resistor (R1: typ.200kΩ) from Hi-z to decrease
a pop noise. And when Power OFF (SPKP = “0”), the pop noise can be decreased by controlling via Power-Save-Mode.
SPPS
-
+
SPPS
or
SPKP
SP0
SPPS
8Ω
SPPS
-
+
SPPS
SPPS
SPKP
SP1
R1
Figure 26. Speaker-Amp Normal Operation
SPPS
-
+
SPPS
or
SPKP
SP0
SPPS
8Ω
SPPS
-
+
SPPS
SPPS
SPKP
SP1
R1
Figure 27. Speaker-Amp Power-Save-Mode
MS0028-E-00
- 36 -
2000/05