CS4329 datasheet(12/36 Pages) CIRRUS

12 / 36 page

CS4329

DS153F1

is changed, the CS4390 will reset. Power is applied

to the internal voltage reference, the D/A convert-

ers, switched-capacitor filters and the DAC will

then enter a calibration mode to properly set the

common mode bias voltage and minimize the dif-

ferential offset. This initialization and calibration

sequence requires approximately 2700 cycles of

LRCK.

A offset calibration can also be invoked by taking

the Format select pins, DIF0, DIF1 and DIF2, to a

logic 1 as shown in Table 2. During calibration, the

differential outputs are shorted together and the

common-mode voltage appears at the output with

approximately an 8 kohm output impedance. Fol-

lowing calibration, the analog output impedance

becomes less than 10 ohms and the common mode

voltage will move to approximately 2.2 V .

The CS4329 will enter the power-down mode,

within 1 period of LRCK, if either MCLK or

LRCK is removed. The initialization sequence, as

described above, occurs when MCLK and LRCK

are restored.

Combined Digital and Analog Filter

Response

The frequency response of the combined analog

switched-capacitor and digital filters is shown in

Figures 9, 10 and 11. The overall response is clock

dependent and will scale with Fs. Note that the re-

sponse plots have been normalized to Fs and can be

de-normalized by multiplying the X-axis scale by

Fs, such as 48 kHz.

Analog Output and Filtering

The analog output should be operated in a differen-

tial mode which allows for the cancellation of com-

mon mode errors including noise, distortion and

offset voltage. Each output will produce a nominal

2.83 Vpp (1 Vrms) output for a full scale digital in-

put which equates to a 5.66 Vpp (2Vrms) differen-

tial signal as shown in Figure 12.

-10

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-90

-100

0.0

0.1

0.2 0.3

0.4

0.5

0.6

0.7 0.8

0.9

1.0

Frequency (x Fs)

Figure 9. CS4329 Combined Digital and Analog Filter

Stopband Rejection

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-90

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0.45

0.48

0.51

0.54

0.57

0.60

Frequency (x Fs)

Figure 10. CS4329 Combined Digital and Analog

Filter

-1

-2

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-8

-9

-10

0.46

0.47

0.48

0.49

0.50

0.51

0.52

Frequency (x Fs)

Figure 11. Combined Digital and Analog Filter

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