AK4691EG AKM [Asahi Kasei Microsystems], AK4691EG Datasheet - Page 57

• Manufacturer Part Number: AK4691EG
• Description: 4ch ADC + 2ch DAC with MIC/HP/SPK-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

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When DACS bit is set to “1”, the DAC output signal is input to the Speaker-amp as [(L+R)/2]. The Speaker-amp is mono
and BTL output. The gain is set by SPKG1-0 bits. Output level depends on AVDD voltage and SPKG1-0 bits.
Note 57. The output level is calculated on the assumption that output signal is not clipped. In actual case, output signal
MS0672-E-00
Speaker Output
AVDD
may be clipped when DAC outputs 0dBFS signal. DAC output level should be set to lower level by setting digital
volume so that Speaker-Amp output level is 4.0Vpp (@ SVDD = 3.0V), 4.6Vpp (@ SVDD = 3.3V) or less and
output signal is not clipped.
3.0V
SVDD
3.0V
3.3V
SPKG1-0 bits
00
01
10
11
SPKG1-0 bits
00
01
10
11
00
01
10
11
Table 53. SPK-Amp Output Level
ALC bit = “0”
Table 52. SPK-Amp Gain
+10.65dB
+12.65dB
+4.43dB
+6.43dB
4.0Vpp
4.0Vpp
4.6Vpp
4.6Vpp
ALC bit = “0”
- 57 -
3.77Vpp
3.77Vpp
3.0Vpp
3.0Vpp
Gain
(Note
(Note
(Note
(Note
SPK-Amp Output (DAC Input = 0dBFS)
ALC bit = “1”
57)
57)
57)
57)
+12.65dB
+14.65dB
+6.43dB
+8.43dB
(LMTH1-0 bits = “00”;-2.5dBFS)
(default)
4.0Vpp
4.0Vpp
4.6Vpp
4.6Vpp
ALC bit = “1”
2.83Vpp
3.56Vpp
2.83Vpp
3.56Vpp
(Note
(Note
(Note
(Note
57)
57)
57)
57)
[AK4691]
2007/11