AK4691 Datasheet, PDF (57/80 Pages) Asahi Kasei Microsystems – 4ch ADC + 2ch DAC with MIC/HP/SPK-AMP

[AK4691]
■ Speaker Output
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.
SPKG1-0 bits
00
01
10
11
Gain
ALC bit = “0”
ALC bit = “1”
+4.43dB
+6.43dB
+6.43dB
+8.43dB
+10.65dB
+12.65dB
+12.65dB
+14.65dB
Table 52. SPK-Amp Gain
(default)
SPK-Amp Output (DAC Input = 0dBFS)
AVDD
SVDD SPKG1-0 bits
ALC bit = “0”
ALC bit = “1”
(LMTH1-0 bits = “00”;-2.5dBFS)
00
3.0Vpp
2.83Vpp
3.0V
01
3.77Vpp
10
4.0Vpp (Note 57)
3.56Vpp
4.0Vpp (Note 57)
3.0V
11
4.0Vpp (Note 57)
00
3.0Vpp
4.0Vpp (Note 57)
2.83Vpp
3.3V
01
3.77Vpp
10
4.6Vpp (Note 57)
3.56Vpp
4.6Vpp (Note 57)
11
4.6Vpp (Note 57)
4.6Vpp (Note 57)
Note 57. The output level is calculated on the assumption that output signal is not clipped. In actual case, output signal
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.
Table 53. SPK-Amp Output Level
MS0672-E-00
- 57 -
2007/11