cs4297 Cirrus Logic, Inc., cs4297 Datasheet - Page 14

• Manufacturer Part Number: cs4297
• Description: Crystalclear Soundfusion Audio Codec 97 Logic
• Manufacturer: Cirrus Logic, Inc.

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.
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9. The Headphone Output pins have been imple-
mented as an Alternate Line Output. These pins
must drive loads greater than 10 k , 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.
CrystalClear™ SoundFusion™ Audio Codec ’97
CS4297
DS242F5