Datasheet


SLES100A − DECEMBER 2003 − REVISED NOVEMBER 2006
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34
Differential Section
The PCM1796 voltage outputs are followed by differential amplifier stages, which sum the differential signals for each
channel, creating a single-ended I/V op-amp output. In addition, the differential amplifiers provide a low-pass filter
function.
The operational amplifier recommended for the differential circuit is the low-noise type.
–
+
R
1
820 Ω
2
3
7
5
8
6
4
C
11
0.1 µF
C
17
22 pF
V
CC
C
1
2700 pF
C
12
0.1 µF
V
EE
U
1
NE5534
I
OUT
–
–
+
R
2
820 Ω
2
3
7
5
8
6
4
C
13
0.1 µF
C
18
22 pF
V
CC
C
2
2700 pF
C
14
0.1 µF
V
EE
U
2
NE5534
I
OUT
+
–
+
2
3
7
4
C
15
0.1 µF
V
CC
C
16
0.1 µF
V
EE
U
3
NE5534
R
9
100 Ω
C
3
8200 pF
R
5
200 Ω
C
4
8200 pF
R
6
200 Ω
R
3
220 Ω
R
4
220 Ω
V
CC
= 15 V
V
EE
= –15 V
f
c
= 50 kHz
C
5
27000 pF
R
7
180 Ω
R
8
180 Ω
5
8
6
C
19
22 pF
Figure 36. Measurement Circuit for PCM