AK4671_10 Datasheet, PDF (112/166 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/RCV/HP-AMP

[AK4671]
■ SAR 10bit ADC
The AK4671 incorporates a 10-bit successive approximation resistor A/D converter for DC measurement.
The A/D converter output is a straight binary format as shown in Table 93:
Input Voltage
(AVDD−1.5LSB) ~ AVDD
(AVDD−2.5LSB) ~ (AVDD−1.5LSB)
:
0.5LSB ~ 1.5LSB
0 ~ 0.5LSB
Table 93. Output Code
Output Code
3FFH
3FEH
:
001H
000H
When PMSAD bit is set to “1”, 10bit ADC is powered-up. When the control register is read, A/D conversion is executed
and data is output. In case of 4-wire serial control mode, 10bit A/D data is output from 9th to 18th CCLK clock when 4th
bit is set to “1” just after R/W bit.
10bit ADC supports 3 kinds of analog input. A1-0 bits select the measurement modes.
Mode
A1
A0
Input Channel
0
0
0
SAIN1
(default)
1
0
1
SAIN2
2
1
0
SAIN3
3
1
1
N/A
Table 94. SAR ADC Measurement Mode (N/A: Not available)
MS0666-E-02
- 112 -
2010/06