AD9961-EBZ datasheet(26/60 Pages) AD

26 / 60 page

AD9961/AD9963

Rev. 0 | 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 TRxCLKIO negative edge to drive out Rxdata.

1: uses TRxCLKIO 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: twos complement on Tx path.

1: straight binary on Tx path.

FIFO Alignment

0x33

Unused

FIFO_INIT

1: FIFO read and write pointers are aligned after chip reset.

Aligned

1: FIFO read and write pointers aligned after frame input driven FIFO reset.

ALIGN_ACK

1: FIFO read and write pointers aligned after serial port driven FIFO reset.

ALIGN_REQ

1: request FIFO read and write pointers alignment via serial port.

2:0

FIFO_OFFSET[2:0]

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

Normally this should be set to 4 to set the FIFFO to half full.

000 = 0.

001 = 1.

…

111 = 7.

FIFO Status

0x34

7:0

FIFO_LVL[7:0]

Indicator of the amount of valid data in the FIFO. Each one indicates a

latched input sample in the FIFO. Ideally, the eight deep FIFO should be

half full, indicating four latched input samples. The indicator is a

thermometer code that can wrap around from LSB to MSB. Some

examples follow:

00011110: indicates that FIFO is half full. The read pointer is 1 and the

write pointer is 5.

10000111: indicates the FIFO is half full. The read pointer is 3 and the

write pointer is 7.

00100000: indicates the FIFO has only one latched sample and is nearly

empty.

01111111: indicates the FIFO has seven latched samples and is nearly

over flowing.

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.

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