Cirrus-logic AN234 Manual de usuario descargar pdf (Pagina 3)

AN234

3. Pin Compatibility

Table 1 shows the pins of the AK5394A and the corresponding pins of the CS5381. Please note that the

AK5394A has 28 pins, and the CS5381 has 24 pins.

Table 2. Pin Compatibility Between AK5394A and CS5381

4. Offset Calibration

The CS5381, and AK5394A all have offset calibration capability. However, the calibration process varies

slightly between the AK5394A and the CS5381.

4.1 CS5381

The CS5381 implements a high pass filter that can be controlled via the HPF

pin (pin 11). The high pass

filter continuously subtracts a measure of the DC offset from the output of the decimation filter. If the HPF

pin is taken high during normal operation, the current value of the DC offset register is frozen and this DC

offset will continue to be subtracted from the conversion result.

A system calibration can then be performed by first running the CS5381 with the high pass filter enabled

(HPF = LOW) until the filter settles. At this point, disable the high pass filter (HPF = HI), thereby freezing

the stored DC offset.

AK5394A CS5381 Description

Pin Number Pin Name Pin Number

Pin Name

1, 28 VREFL+, VREFR+ 24

FILT+

Positive reference voltage

2, 27 VREFL-, VREFR- 23

REFGND

Ground reference

3, 26 VCOML, VCOMR 22

Internal quiescent reference voltage

4 AINL+ 16

AINL+

Differential Left Channel Input

5 AINL- 17

AINL-

Differential Left Channel Input

6ZCAL -

Zero Calibration Control

7VD 6

Digital power

8DGND 7

GND

Ground reference

9CAL -

Calibration Active Signal

10 RST 1

RST

Reset

11 SMODE2 12

I2S/LJ

Digital Interface Format Select

12 SMODE1 2

M/S

Master/Slave Mode Select

13 LRCK 3

LRCK

Left right clock

14 SCLK 4

SCLK

Serial clock

15 SDATA 9

SDOUT

Serial data

16 FSYNC -

Frame Synchronization Signal

17 MCLK 5

MCLK

Master clock

18 DFS0 13

Mode selection

19 HPFE 11

HPF

High Pass Filter Enable

20 DFS1 14

Mode selection

21 BGND -

Substrate Ground

22 AGND 18

GND

Ground reference

23 VA 19

Analog power

24 AINR- 20

AINR-

Differential Right Channel Input

25 AINR+ 21

AINR+

Differential Right Channel Input

Logic Power

MDIV

MCLK divider

OVFL

Overflow

1 2 3 4 5 6 7

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Cirrus-logic AN234 Manual de usuario Pagina 3

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