Datasheet

AD1937
Rev. B | Page 32 of 36
APPLICATIONS CIRCUITS
Typical application circuits are shown in Figure 31 through Figure 34. Figure 31 shows a typical ADC input filter circuit. Recommended
loop filters for LRCLK and MCLK as the PLL reference are shown in Figure 32. Output filters for the DAC outputs are shown in Figure 33
and a regulator circuit is shown in Figure 34.
2
1
3
OP275
–
+
6
7
5
OP275
+
–
5.76kΩ
5.76kΩ 237Ω
5.76kΩ
120pF
600Z
A
UDIO
INPUT
100pF
5.76kΩ
120pF
4.7µF
+
237Ω
4.7µF
+
100pF
1nF
NPO
1nF
NPO
ADCxxN
ADCxxP
07414-030
Figure 31. Typical ADC Input Filter Circuit
39nF
2.2nF
LF
LRCL
K
A
VDD2
3.32kΩ
5.6nF
390pF
LF
MCLK
AVDD2
562Ω
07414-031
Figure 32. Recommended Loop Filters for LRCLK or MCLK as PLL Reference
2
1
3
OP275
–
+
2.2nF
NPO
AUDIO
OUTPUT
604Ω
68pF
NPO
150pF
NPO
560pF
NPO
270pF
NPO
DAC
OUTN
11kΩ
3.01kΩ
11kΩ
DAC
OUTP
5.62kΩ 1.50kΩ
5.62kΩ
07414-032
Figure 33. Typical DAC Output Filter Circuit (Differential)
VSUPPLY 5V
10µF
+
E
C
B
VSENSE 3.3V
FZT953
VDRIVE
1kΩ
100nF
10µF
+
100nF
07414-033
Figure 34. Recommended 3.3 V Regulator Circuit