ak4537 AKM Semiconductor, Inc., ak4537 Datasheet - Page 34

• Manufacturer Part Number: ak4537
• Description: 16-bit 6 Stereo Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
„ Speaker Output
The output signal from analog volume is converted into a mono signal [(L+R)/2] and this signal is input to the
Speaker-amp via the ALC2 circuit. This Speaker-amp is a mono BTL output. When DAC output signal is input to MIN
pin as system design example (Figure 47), Speaker-amp can output a maximum of 300mW@SPKG bit = “0” and ALC2
bit = “0” at 8 load when HVDD = 3.3V. When BEEP input is used for DAC output, maximum power becomes 400mW.
Figure 29 and Figure 30 indicates connection examples for 400mW output.
Speaker blocks (MOUT2, ALC2 and Speaker-amp) can be powered up/down by controlling the PMSPK bit. When the
PMSPK bit is “0”, the MOUT2, SPP and SPN pins are placed in a Hi-Z state.
When the SPPS bit is “0”, the Speaker-amp enters power-save-mode. In this mode, the SPP pin is placed in a Hi-Z state
and the SPN pin goes to HVDD/2 voltage. And then the Speaker output gradually changes to the HVDD/2 voltage and
this mode can reduce pop noise at power-up. When the AK4537 is powered down, pop noise can be also reduced by first
entering power-save-mode.
[Connection Example for 400mW output]
1)
MS0202-E-04
Using BEEPM pin
PMSPK bit
SPPS bit
SPP pin
SPN pin
Figure 29. Connection example for 400mW output using BEEPM pin (SPKG bit = “1”)
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MOUT2
Hi-Z
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AK4537
0.047u
Table 20. SPK-Amp Maximum Output Power (x: Don’t care)
Figure 28. Power-up/Power-down Timing for Speaker-amp
HVDD/2
Hi-Z
SPKG
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0
1
16k
ALC2
BEEPM
45%AVDD
x
0
1
- 34 -
20k
30%
Po(max)
150mW
300mW
250mW
BPMSP
Default
SPK-Amp
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SPP
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Hi-Z
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Hi-Z
[AK4537]
2005/04