AD1937

Rev. 0 | 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

AUDIO

INPUT

100pF

5.76kΩ

120pF

4.7µF

+

237Ω

4.7µF

+

100pF

1nF

NPO

1nF

NPO

ADCxxN

ADCxxP

Figure 31. Typical ADC Input Filter Circuit

39nF

2.2nF

LF

LRCLK

AVDD2

3.32kΩ

5.6nF

390pF

LF

MCLK

AVDD2

562Ω

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

3.01kΩ

11kΩ

DAC

OUTP

1.50kΩ

5.62kΩ

11kΩ

5.62kΩ

Figure 33. Typical DAC Output Filter Circuit (Differential)

10µF

+

E

C

B

VSUPPLY

5V

VSENSE

3.3V

FZT953

VDRIVE

1kΩ

100nF

10µF

+

100nF

Figure 34. Recommended 3.3 V Regulator Circuit