CS4297 datasheet(14/46 Pages) CIRRUS

14 / 46 page

DS242F5

CS4297

CrystalClear™ SoundFusion™ Audio Codec ’97

4. The digital outputs are specified with a 18 pF ca-

pacitive load.

5. The nominal Vrefout level is 2.2 V.

6. All analog mixer input and output paths are de-

signed to achieve greater than 90 dBFSA Dynamic

Range.

7. All stereo-to-mono mixer stages contain a scale

factor of -6 dB to prevent output clipping of the

summed mono signal.

8. When the analog mixer is powered down, the

control registers for Record Select and Record

Gain are frozen. The analog mixer stage must be

powered up to gain access to these registers.

9. The Headphone Output pins have been imple-

mented as an Alternate Line Output. These pins

must drive loads greater than 10 k

Ω, just as the

Line Outputs.

10. Reserved bits in the AC’97 serial data input

stream may return a ‘set’ or a ‘cleared’ value.

11. The Vref pin defined in the AC’97 Specifica-

tion has been renamed to REFFLT. This pin is used

for internal filtering and should not be used as an

external circuit bias voltage. The Vrefout pin is

used to supply biasing voltages to external analog

circuitry. This pin is not capable of supplying 5 mA

of bias current as the specification indicates.

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