AD1937 AD [Analog Devices], AD1937 Datasheet - Page 32

• Manufacturer Part Number: AD1937
• Description: Four ADCs/Eight DACs with PLL, 192 kHz, 24-Bit Codec
• Manufacturer: AD [Analog Devices]

AD1937
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.
AUDIO
INPUT
Figure 32. Recommended Loop Filters for LRCLK or MCLK as PLL Reference
AVDD2
600Z
100pF
LF
Figure 31. Typical ADC Input Filter Circuit
5.76kΩ
LRCLK
3.32kΩ
39nF
2
3
6
5
OP275
–
OP275
+
–
+
2.2nF
5.76kΩ
5.76kΩ
5.76kΩ
120pF
120pF
AVDD2
1
7
LF
4.7µF
4.7µF
+
+
MCLK
562Ω
5.6nF
237Ω
237Ω
NPO
NPO
1nF
1nF
390pF
100pF
ADCxxN
ADCxxP
Rev. 0 | Page 32 of 36
OUTN
OUTP
DAC
DAC
Figure 33. Typical DAC Output Filter Circuit (Differential)
5.62kΩ
5.62kΩ
11kΩ
Figure 34. Recommended 3.3 V Regulator Circuit
VSUPPLY
11kΩ
VSENSE
VDRIVE
3.01kΩ
1.50kΩ
270pF
NPO
560pF
NPO
100nF
100nF
1kΩ
68pF
NPO
150pF
NPO
2
3
–
OP275
+
B
+
+
10µF
10µF
E
C
1
FZT953
604Ω
2.2nF
NPO
5V
3.3V
AUDIO
OUTPUT