Use 400Hz High-Pass
Filter and 30kHz
Low-Pass Filter
Low-Pass
Filter
40kHz 3rd-Order
GIC Type
Programmable
Gain Amp
0dB to 60dB
Distortion
Analyzer
Meter Settings
(Shiba Soku Model
725 or Equivalent)
I-to-V
Converter
OPA627
Binary
Counter
Digital Code
(EPROM)
Parallel-to-Serial
Conversion
DUT
(PCM67/69A)
System Clock
Bit Clock
Word Clock
Sampling Rate = 44.1kHz x 8 (352.8kHz)
Output Frequency = 991Hz
Timing
Logic
FIGURE 12. PCM67/69A THD+N Production Test.
C10
1000pF
R5
2kΩ
+5V
R7
200Ω
11
12
13
14
15
16
17
18
19
20
10
9
8
7
6
5
4
3
2
1
A2
OUT R-ch
2.5V ± 1.2V
+
C6
+
C12
C8
C9
+
2200pF
100µF
10µF
R4
C5
C4
PCM67
or
PCM69A
680Ω
Digital
In
1000pF
R6
10µF
10µF
R3
680Ω
2kΩ
R8
200Ω
A1
OUT L-ch
2.5V ± 1.2V
+
C3
C7
+
+
C11
R2
100µF
10µF
680Ω
2200pF
R1
A1, A2; NJM2100 or LM833
+
C1
0.1µF
680Ω
VCC
(+5V)
+
C2
100µF
FIGURE 13. Single +5V Power Supply, with LPF, I/V Amp Application Circuit for Portable Digital Audio.
®
11
PCM67/69A
BB [ BURR-BROWN CORPORATION ]
