AD1939

Data Sheet

Rev. E | Page 16 of 32

Combining the AUX ADC and DAC modes results in a system

configuration of 8 ADCs and 12 DACs. The system, then, con-

sists of two external stereo ADCs, two external stereo DACs,

and one AD1939. This mode is shown in Figure 17 (combined

AUX DAC and ADC modes).

Table 12. Pin Function Changes in TDM and AUX Modes

Pin Mnemonic

Stereo Modes

TDM Modes

AUX Modes

ASDATA1

ADC1 Data Out

ADC TDM Data Out

TDM Data Out

ASDATA2

ADC2 Data Out

ADC TDM Data In

AUX Data Out 1 (to Ext. DAC 1)

DSDATA1

DAC1 Data In

DAC TDM Data In

TDM Data In

DSDATA2

DAC2 Data In

DAC TDM Data Out

AUX Data In 1 (from Ext. ADC 1)

DSDATA3

DAC3 Data In

DAC TDM Data In 2 (Dual-Line Mode)

AUX Data In 2 (from Ext. ADC 2)

DSDATA4

DAC4 Data In

DAC TDM Data Out 2 (Dual-Line Mode)

AUX Data Out 2 (to Ext. DAC 2)

ALRCLK

ADC LRCLK In/ADC LRCLK Out

ADC TDM Frame Sync In/ADC TDM Frame Sync Out

TDM Frame Sync In/TDM Frame Sync Out

ABCLK

ADC BCLK In/ADC BCLK Out

ADC TDM BCLK In/ADC TDM BCLK Out

TDM BCLK In/TDM BCLK Out

DLRCLK

DAC LRCLK In/DAC LRCLK Out

DAC TDM Frame Sync In/DAC TDM Frame Sync Out

AUX LRCLK In/AUX LRCLK Out

DBCLK

DAC BCLK In/DAC BCLK Out

DAC TDM BCLK In/DAC TDM BCLK Out

AUX BCLK In/AUX BCLK Out

LEFT

RIGHT

MSB

MSB

MSB

MSB

ALRCLK

ABCLK

DSDATA1

(TDM_IN)

DLRCLK

(AUX PORT)

DBCLK

(AUX PORT)

ASDATA2

(AUX1_OUT)

DSDATA4

(AUX2_OUT)

MSB

EMPTY

EMPTY

EMPTY

EMPTY

DAC L1 DAC R1 DAC L2 DAC R2 DAC L3 DAC R3 DAC L4 DAC R4 AUX L1 AUX R1 AUX L2 AUX R2

8 ON-CHIP DAC CHANNELS

AUXILIARY DAC CHANNELS

APPEAR AT

AUX DAC PORTS

UNUSED SLOTS

32 BITS

Figure 14. 16-Channel DAC TDM-AUX Mode