AK5700VN AKM [Asahi Kasei Microsystems], AK5700VN Datasheet - Page 32

• Manufacturer Part Number: AK5700VN
• Description: 16-Bit ?? Mono ADC with PLL & MIC-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

ASAHI KASEI
The ADC has a digital high pass filter for DC offset cancellation. The cut-off frequency of the HPF is selected by HPF1-0
bits (see Table 17) and scales with sampling rate (fs). The default value is 3.4Hz (@fs=44.1kHz).
The AK5700 has input selector. When MDIF1 bit is “0”, AIN bit selects AIN1or AIN2. When MDIF1 bit is “1”, AIN1pin
become AIN+ pin . In this case, full-differential input is available (Figure 33). When full-differential input is used, the
signal should not be input to the pins marked by “X” in Table 19.
MS0569-E-01
Digital High Pass Filter
MIC/LINE Input Selector
HPF1 bit
0
0
1
1
Table 19. Handling of MIC/Line Input Pins (“-“: N/A; “X”: Signal should not be input.)
AIN1/AIN+ pin
AIN− pin
AIN2 pin
HPF0 bit
MDIF1 bit
0
1
0
1
0
1
AK5700
Table 17. Digital HPF Cut-off Frequency
MDIF1 bit
Register
Figure 32. Mic/Line Input Selector
Table 18. MIC/Line In Path Select
0
1
fs=44.1kHz
13.6Hz
3.4Hz
6.8Hz
N/A
AIN bit
AIN1+
AIN1
0
1
0
1
x
x
Pin
O
O
MDIF1 bit
AIN bit
- 32 -
fs=22.05kHz
AIN2
O
X
1.7Hz
3.4Hz
6.8Hz
AIN+/−
AIN+/−
N/A
AIN1
AIN1
AIN2
AIN2
AIN1
fc
Ach
N/A
N/A
AIN1−
O
-
Default
fs=11.025kHz
0.85Hz
1.7Hz
3.4Hz
ADC
N/A
Default
[AK5700]
2006/12