Datasheet

DAC5688

SLLS880C –DECEMBER 2007–REVISED AUGUST 2010

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Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

PLL_lock unused unused device_ID (2:0) version(1:0)

0 0 0 0 0 0 0 1

PLL_lock : Asserted when the internal PLL is locked. (Read Only)

device_ID(2:0) : Returns ‘000’ for DAC5688. (Read Only)

version(1:0) : A hardwired register that contains the version of the chip. (Read Only)

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

insel_mode (1:0) unused synchr_clkin twos inv_inclk interp_valule(1:0)

0 0 0 0 1 0 1 1

insel_mode(1:0) : Controls the expected format of the input data. For the interleaved modes, TXENABLE or the MSB of the port

that does not have data can be used to tell the chip which sample is the A sample. For TXENABLE the sample

aligned with the rising edge is A. For the MSB, it is presumed that this signal will toggle with A and B. The MSB

should be ‘1’ for A and ‘0’ for B. (*** See CONFIG23 ***)

insel_mode Function

00 Normal input on A and B.

01 Interleaved input on A, which is de-interleaved and placed on

both A and B data paths. (*** See CONFIG23 ***)

10 Interleaved input on B, which is de-interleaved and placed on

both A and B data paths. (*** See CONFIG23 ***)

11 Half rate data on A and B inputs. This data is merge together

to form a single stream of data on the A data path.

synchr_clkin : This turns on the synchronous mode of the dual-clock in mode. In this mode, the CLK2/C and CLK1/C must be

synchronous in phase since the slower clock is used to synchronize dividers in the clock distribution circuit.

twos : When set (default), the input data format is expected to be 2’s complement. When cleared, the input is

expected to be offset-binary.

inv_inclk : This allows the input clock, the clock driving the input side of the FIFO to be inverted. This allows easier

registering of the data (more setup/hold time) in the single-clock mode of the device

interp_value(1:0) : These bits define the interpolation factor:

interp_value Interpolation Factor

00 1X

01 2X

10 4X

11 8X

Product Folder Link(s): DAC5688