參數(shù)資料
型號(hào): AK5700VN
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: 16-Bit ツヒ Mono ADC with PLL & MIC-AMP
中文描述: 16位ツヒ單聲道ADC,帶鎖相環(huán)
文件頁數(shù): 32/61頁
文件大?。?/td> 519K
代理商: AK5700VN
ASAHI KASEI
[AK5700]
MS0569-E-01
2006/12
- 32 -
Digital High Pass Filter
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).
HPF1 bit
HPF0 bit
fs=44.1kHz
0
0
3.4Hz
0
1
6.8Hz
1
0
13.6Hz
1
1
N/A
Table 17. Digital HPF Cut-off Frequency
MIC/LINE Input Selector
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.
MDIF1 bit
AIN bit
fc
Default
fs=22.05kHz
1.7Hz
3.4Hz
6.8Hz
N/A
fs=11.025kHz
0.85Hz
1.7Hz
3.4Hz
N/A
Ach
AIN1
AIN1
AIN2
AIN2
AIN1
N/A
N/A
AIN+/
AIN+/
Default
0
1
0
1
0
x
1
x
Table 18. MIC/Line In Path Select
Register
Pin
AIN1
AIN1+
O
O
MDIF1 bit
AIN2
AIN1
0
1
O
X
-
O
Table 19. Handling of MIC/Line Input Pins (“-“: N/A; “X”: Signal should not be input.)
AIN1/AIN+ pin
ADC
AIN
pin
AIN bit
MDIF1 bit
AIN2 pin
AK5700
Figure 32. Mic/Line Input Selector
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