CS4525 datasheet(19/98 Pages) CIRRUS

19 / 98 page

DS726PP1

CS4525

ANALOG INPUT CHARACTERISTICS

Test Conditions (unless otherwise specified): AGND = DGND = PGND = 0 V; All voltages with respect to ground;

TA = 25°C; VD = 3.3 V; Input Signal: 1 kHz sine wave through the recommended passive input filter shown in Fig-

ure 28 on page 61; Capacitor values connected to AFILTA, AFILTB, FILT+, VQ, VD_REG, and VA_REG as shown

in Figure 1 on page 13; Sample Frequency = 48 kHz; 10 Hz to 20 kHz Measurement Bandwidth; Power outputs in

power-down state (PDnOut1 = 1, PDnOut2 = 1, PDnOut3/4 = 1).

Notes:

4. Referred to the typical full-scale voltage

5. For VD = 2.5 V, VA_REG and VD_REG must be connected to VD. See section 6.7 on page 63 for

details.

6. Measured between AINx and AGND.

ADC DIGITAL FILTER CHARACTERISTICS

Notes:

7. Filter response is clock dependent and scales with the ADC sampling frequency (Fs). With a

27.000 MHz or 24.576 MHz XTAL/SYS_CLK, Fs is equal to the applied clock divided by 512. With an

18.432 MHz XTAL/SYS_CLK, Fs is equal to the applied clock divided by 384.

Parameter

Min

Typ

Max

Unit

Dynamic Range (Note 4)

A-weighted

unweighted

Total Harmonic Distortion + Noise

-1 dB

-20 dB

-60 dB

-86

-72

-32

-77

DC Accuracy

Interchannel Gain Mismatch

0.05

Gain Drift

±100

ppm/°C

Interchannel Isolation

Full-scale Input Voltage

VD = 2.5V (Note 5)

VD = 3.3V

VD = 5.0V

0.786*VD

0.590*VD

0.398*VD

0.827*VD

0.621*VD

0.419*VD

0.868*VD

0.652*VD

0.440*VD

Vpp

Input Impedance

(Note 6)

Parameter

Min

Typ

Max

Unit

Passband (Frequency Response) (Note 7)

to -0.1 dB corner

0.4948

Passband Ripple

-0.09

Stopband

(Note 7) 0.6677

Stopband Attenuation

48.4

Total Group Delay

2.7/Fs

High-Pass Filter Characteristics

Frequency Response

-3.0 dB

-0.13 dB

3.7

24.2

Phase Deviation

20 Hz

Deg

Passband Ripple

0.17

Filter Settling Time

-105/Fs

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