CS4297 datasheet(34/46 Pages) CIRRUS

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DS242F5

CS4297

CrystalClear™ SoundFusion™ Audio Codec ’97

PERFORMANCE PLOTS

Figures 11 through 26 show the overall Frequency

Response, the THD+N over frequency, and the DR

over frequency of the ADCs, the DACs, the analog

mixer (Line In to Line Out) and the microphone in-

puts. Crosstalk plots and the noise floor FFT plots

of the DACs, the analog mixer and the muted noise

floor of the CS4297 are also included. All plots

were taken on a CRD4297-1 with a CS4297-KQ

Codec.

Figures 11, 14, 17, and 20: The Frequency Re-

sponse plots were taken using a -20 dB FS input

signal swept over the frequency range of 20 Hz to

20 kHz and normalized to 0 dB at 1 kHz.

Figures 12, 15, 18, and 21: The THD+N plots were

taken using a -3 dB FS input signal swept over the

frequency range of 20 Hz to 20 kHz. These perfor-

mance plots used an “A”-weighted filter applied on

the output with the exception of the ADC THD+N

plot.

Figures 13, 16, 19, and 22: The Dynamic Range

plots were taken using a -50 dB FS input signal

swept over the frequency range of 20 Hz to 20 kHz.

These performance plots used an “A”-weighted fil-

ter applied on the output with the exception of the

ADC Dynamic Range plot.

Figure 23: The crosstalk plot was generated using a

0 dB FS input signal on one channel of the

LINE_IN input and measuring the magnitude of

the other output channel swept over the frequency

range of 20 Hz to 20 kHz. This performance plots

used an “A”-weighted filter applied on the output

Figures 24, 25, and 26: The noise floor plots were

generated by running a 16K-point FFT on the

LINE_OUT output with no input signal applied.

The Muted Noise Floor plot was taken with the

master mute bit ‘set’ (bit D15, register 0x02h).

These performance plots used an “A”-weighted fil-

ter applied on the output

All audio performance plots used unity gain set-

tings on the analog volume controls. Additionally,

the microphone input plots were taken with the +20

dB gain stage enabled (bit D6, register 0x0Eh).

The ADC plots used the A-D signal path. The DAC

plots used the D-A signal path. The mixer and the

microphone plots used the A-A signal path.

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