ADA4075-2ACPZ-R7 datasheet(18/25 Pages) AD

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Data Sheet

ADA4075-2

Rev. C | Page 17 of 24

DAC OUTPUT FILTER

The ultralow voltage noise, low distortion, and high slew rate of

the ADA4075-2 make it an ideal choice for professional audio

signal processing. Figure 66 shows the ADA4075-2 used in a

typical audio DAC output filter configuration. The differential

outputs of the DAC are fed into the ADA4075-2. The ADA4075-2

is configured as a differential Sallen-Key filter. It operates as an

external low-pass filter to remove high frequency noise present

on the output pins of the DAC. It also provides differential-to-

single-ended conversion from the differential outputs of the DAC.

For a DAC output filter, an op amp with reasonable slew rate and

bandwidth is required. The ADA4075-2 has a high slew rate of the

12 V/µs and a relatively wide bandwidth of 6.5 MHz. The cutoff

frequency of the low-pass filter is approximately 167 kHz. In

addition, the 100 kΩ − 47 µF RC network provides ac coupling

to block out the dc components at the output.

OUTPUT

DAC OUTN

DAC OUTP

11k

Ω

11k

Ω

5.62k

Ω

1.5k

Ω

3.01k

Ω

100

Ω

5.62k

Ω

100k

Ω

2.2nF

150pF

270pF

560pF

68pF

47µF

ADA4075-2

1/2

Figure 66. Typical DAC Output Filter Circuit (Differential)

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