参数资料
型号: AD73522
厂商: Analog Devices, Inc.
英文描述: Dual Analog Front End with Flash based DSP Microcomputer(带闪速DSP微计算机的双模拟前端)
中文描述: 双模拟前端与闪存的DSP微机(带闪速DSP的微计算机的双模拟前端)
文件页数: 44/46页
文件大小: 654K
代理商: AD73522
AD73522
–44–
REV. PrC 05/99
Prelimnary Technical Data
PRELMNARY
DATA
2
π
f
C
R
LOAD
TECHNCAL
VFBN1
GAIN
6
1
+6/15dB
PGA
CONTINUOUS
TIME
LOW-PASS
FILTER
V
REF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
REFERENCE
V
REF
0/38dB
PGA
ELECTRET
PROBE
10
m
F
R
A
R
B
R1
R2
+5V
C2
C1
C
REFCAP
Figure 30. Electret Microphone Interface Circuit
Analog Output
T he AD73522’s differential analog output (VOUT ) is
produced by an on-chip differential amplifier. T he differential
output can be ac-coupled or dc-coupled directly to a load
which can be a headset or the input of an external amplifier
(the specified minimum resistive load on the output section is
150
.) It is possible to connect the outputs in either a
differential or a single-ended configuration but please note
that the effective maximum output voltage swing (peak to
peak) is halved in the case of single-ended connection. Figure
31 shows a simple circuit providing a differential output with
ac coupling. T he capacitors in this circuit (C
OUT
) are
optional; if used, their value can be chosen as follows:
C
OUT
=
1
where
f
C
= desired cutoff frequency.
VFBN1
GAIN
1
+PGA
CONTIME
LOW-PASS
FILTER
V
REF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
REFERENCE
C
REFCAP
R
LOAD
C
OUT
C
OUT
Figure 31. Example Circuit for Differential Output
Figure 32 shows an example circuit for providing a single-
ended output with ac coupling. T he capacitor of this circuit
(C
OUT
) is not optional if dc current drain is to be avoided.
VFBN1
GAIN
6
1
+6/15dB
PGA
CONTINUOUS
TIME
LFILTER
V
REF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
REFERENCE
R
LOAD
C
OUT
0.1
m
F
Figure 32. Example Circuit for Single-Ended Output
Differential to Single-E nded Output
In some applications it may be desireable to convert the full
differential output of the decoder channel to a single-ended
signal. T he circuit of Figure 33 shows a scheme for doing
this.
VFBN1
GAIN
6
1
+6/15dB
PGA
CONTINUOUS
TIME
LOW-PASS
FILTER
V
REF
VINN1
VINP1
VFBP1
VOUTP1
VOUTN1
REFCAP
REFOUT
REFERENCE
V
REF
0/38dB
PGA
R
LOAD
R
I
R
I
R
R
F
0.1
m
F
Figure 33. Example Circuit for Differential to Single-
Ended Output Conversion
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