AD-DPGIOZ datasheet(26/61 Pages) AD

26 / 61 page

AD9961/AD9963

Data Sheet

Rev. A | Page 26 of 60

Address

Bit(s)

Parameter

Function

11: RXCLK is driven by the DLL output.

Note that the RXCLK signal is present on the TRXCLK pin with one

exception. In Half-Duplex 1-Clock mode, the RXCLK signal is present on

the TRXCLK pin when Rx is active, but the TXCLK signal appears on the

TRXCLK pin when TX is active.

RXCLK_INV

0: uses TRxCLK negative edge to drive out Rxdata.

1: uses TRxCLK positive edge to drive out Rxdata.

RXIQ_HILO

Data appears on the RXD bus sequentially but is sampled in the Rx path

in pairs. RXIQ_HILO selects how the RXIQ signal marks each data pair.

0: each data pair is marked by RXIQ being low then high.

1: each data pair is marked by RXIQ being high then low.

RX_IFIRST

The Rx path I and Q ADCs sample simultaneously producing a pair of

samples. Because the RXD bus is shared, the sampled I and Q data

appears on the TRXD bus sequentially. This bit determines the order of

the paired samples.

0: Q appears first on Rx path.

1: I appears first on Rx path.

RX_BNRY

0: straight binaryon Rx path.

1: twos compliment on Rx path.

FIFO Alignment

0x33

Unused

ALIGN_REQ

1: request FIFO read and write pointers alignment

2:0

FIFO_OFFSET[2:0]

Sets the FIFO read and write pointer phase offset following FIFO reset.

Normally this should be set to 000 to set the FIFO to half full.

FIFO Status

0x34

7:0

FIFO_LVL[7:0]

For valid transmit data path operation, the FIFO should be running half

full, that is, it should always contain 4 valid DAC input samples for each

DAC.

FIFO_LVL values of 00011110, 00011111, 000001110, and 00001111 all

indicate that the FIFO is half full. This phenomenon is due to ambiguities

in reading back the FIFO_LVL level from this register using the SPI port

versus the actual FIFO pointer values.

Tx Scale P

0x35

7:5

Unused

4:0

SRRC_SCALE[4:0]

Value of 1.4 multiplier applied to both I and Q channels just after the

SRRC filter.

00000: multiply by 0.0.

00001: multiply by 0.0625.

…

11111: multiply by 1.9375.

Tx Scale 0

0x36

7:5

Unused

4:0

INT0_SCALE[4:0]

Value of 1.4 multiplier applied to both I and Q channels just after

Interpolation Filter 0.

00000: multiply by 0.0.

00001: multiply by 0.0625.

…

Tx Scale 1

0x37

7:5

Unused

11111: multiply by 1.9375.

4:0

INT1_SCALE[4:0]

Value of 1.4 multiplier applied to both I and Q channels just after

Interpolation Filter 1.

00000: multiply by 0.0.

00001: multiply by 0.0625.

11111: multiply by 1.9375.

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