CS5351 datasheet(24/24 Pages) CIRRUS

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CS5351

DS565PP2

7 ADDENDUM

The CS5351 and CS5361 family of analog-to-digi-

tal converters are functionally compatible and can

easily be interchanged with minimal modifications

to the input buffer circuitry.

Figure 25 shows an analog input buffer that pro-

vides anti-alias filtering, proper dc biasing, and op-

timum source impedance for the modulators. The

input buffer shown will work well with both the

CS5351 and the CS5361, merely by changing the

bill of materials.

In order to use this buffer design with the CS5351,

one would stuff the 0ohm resistors R19 and R22

and not populate R3 and R20. This will create a sin-

gle-ended input buffer (as shown in Figure 3) with

the unused differential input pin connected to the

quiescent voltage of the converter (VQ). Note that

in this configuration, it is unnecessary to have the

second op-amp and related components.

In order to use this buffer design with the CS5361,

one would stuff the 0ohm resistors R3 and R20 and

not populate R19 and R22. This will create a fully

differential analog input buffer.

Figure 25. CS5351/CS5361 Analog Input Buffer

CS5351 Datasheet(PDF) 24 Page - Cirrus Logic