AD1837AASZ datasheet(17/24 Pages) AD

17 / 24 page

REV. A

AD1837A

–17–

Table IV. Pin Function Changes in Auxiliary Mode

Pin Name

2S Mode

Auxiliary Mode

ASDATA (O)

2S Data Out, Internal ADC

TDM Data Out to SHARC.

DSDATA1 (I)

2S Data In, Internal DAC1

TDM Data In from SHARC.

DSDATA2 (I)/AAUXDATA1 (I)

2S Data In, Internal DAC2

AUX-I

2S Data In 1 (from External ADC).

DSDATA3 (I)/AAUXDATA2 (I)

2S Data In, Internal DAC3

AUX-I

2S Data In 2 (from External ADC).

DSDATA4 (I)/AAUXDATA3 (I)

2S Data In, Internal DAC4

AUX-I

2S Data In 3 (from External ADC).

ALRCLK (O)

LRCLK for ADC

TDM Frame Sync Out to SHARC (FSTDM).

ABCLK (O)

BCLK for ADC

TDM BCLK Out to SHARC.

DLRCLK (I)/AUXLRCLK (I/O)

LRCLK In/Out Internal DACs

AUX LRCLK In/Out. Driven by external LRCLK from

ADC in slave mode. In master mode, driven by

MCLK/512.

DBCLK (I)/AUXBCLK (I/O)

BCLK In/Out Internal DACs

AUX BCLK In/Out. Driven by external BCLK from ADC

in slave mode. In master mode, driven by MCLK/8.

FSTDM

INTERNAL

ADC L1

AUX_ADC L2

AUX_ADC L3

AUX_ADC L4

INTERNAL

ADC R1

AUX_ADC R2

AUX_ADC R3

AUX_ADC R4

INTERNAL

DAC L1

INTERNAL

DAC L2

INTERNAL

DAC L3

INTERNAL

DAC R1

INTERNAL

DAC R2

INTERNAL

DAC R3

MSB TDM

1ST

LEFT

RIGHT

I2S – MSB RIGHT

I2S – MSB LEFT

BCLK

TDM

ASDATA1

TDM (OUT)

ASDATA

DSDATA1

TDM (IN)

DSDATA1

AUX

LRCLK I2S

(FROM AUX ADC NO. 1)

AUX

BCLK I2S

(FROM AUX ADC NO. 1)

AAUXDATA1 (IN)

(FROM AUX ADC NO. 1)

AAUXDATA2 (IN)

(FROM AUX ADC NO. 2)

AAUXDATA3 (IN)

(FROM AUX ADC NO. 3)

AUX BCLK FREQUENCY IS 64

FRAME RATE; TDM BCLK FREQUENCY IS 256

FRAME RATE.

MSB TDM

8TH

MSB TDM

1ST

MSB TDM

8TH

I2S – MSB RIGHT

I2S – MSB LEFT

I2S – MSB RIGHT

I2S – MSB LEFT

INTERNAL

DAC L4

INTERNAL

DAC R4

Figure 11. Auxiliary Mode Timing

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