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参数资料
| 型号： | AD73422BB-80 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 数字信号处理 |
| 英文描述： | Dual Low Power CMOS Analog Front End with DSP Microcomputer |
| 中文描述： | 24-BIT, 52 MHz, MIXED DSP, PBGA119 |
| 封装： | PLASTIC, BGA-119 |
| 文件页数： | 34/36页 |
| 文件大小： | 396K |
| 代理商： | AD73422BB-80 |
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REV. 0
AD73422
–
34
–
In the case of ac-coupling, a capacitor is used to couple the
signal to the input of the ADC. The ADC input must be biased
to the internal reference (REFCAP) level, which is done by
connecting the input to the REFOUT pin through a 10 k
resistor as shown in Figure 28.
CONTINUOUS
TIME
LOW-PASS
FILTER
V
REF
VFBN1
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
AD73422
V
REF
+6/
–
15dB
PGA
REFERENCE
0/38dB
PGA
0.1 F
GAIN
1
100
10k
0.1 F
100
0.047 F
0.047 F
10k
0.1 F
Figure 28. Analog Input (AC-Coupled) Differential
If the ADC is being connected in single-ended mode, the
AD73422 should be programmed for single-ended mode using
the SEEN and INV bits of CRF and the inputs connected as
shown in Figure 29. When operated in single-ended input
mode, the AD73422 can multiplex one of the two inputs to the
ADC input.
CONTINUOUS
TIME
LOW-PASS
FILTER
V
REF
VFBN1
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
AD73422
V
REF
+6/
–
15dB
PGA
REFERENCE
0/38dB
PGA
0.1 F
GAIN
1
100
0.047 F
10k
0.1 F
Figure 29. Analog Input (AC-Coupled) Single-Ended
If best performance is required from a single-ended source, it is
possible to configure the AD73422’s input amplifiers as a
single-ended-to-differential converter as shown in Figure 30.
CONTINUOUS
TIME
LOW-PASS
FILTER
V
REF
VFBN1
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
AD73422
V
REF
+6/
–
15dB
PGA
REFERENCE
0/38dB
PGA
0.1 F
GAIN
1
100pF
50k
50k
100pF
50k
50k
Figure 30. Single-Ended-to-Differential Conversion On
Analog Input
Interfacing to an Electret Microphone
Figure 31 details an interface for an electret microphone which
may be used in some voice applications. Electret microphones
typically feature a FET amplifier whose output is accessed on
the same lead that supplies power to the microphone, therefore
this output signal must be capacitively coupled to remove the
power supply (dc) component. In this circuit the AD73422
CONTINUOUS
TIME
LOW-PASS
FILTER
V
REF
VFBN1
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
AD73422
V
REF
+6/
–
15dB
PGA
REFERENCE
0/38dB
PGA
GAIN
1
C1
R2
R1
C2
R
B
R
A
+5V
ELECTRET
PROBE
10 F
C
REFCAP
Figure 31. Electret Microphone Interface Circuit
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