DAC5682Z datasheet(22/59 Pages) TI

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DAC5682Z

SLLS853C – AUGUST 2007 – REVISED JUNE 2009 ........................................................................................................................................................ www.ti.com

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Twos_comp

dual_DAC

FIR2x4x

Unused

CMIX1_mode(1:0)

CMIX0_mode(1:0)

Twos_comp:

When set (default) the input data format is expected to be 2’s complement, otherwise

offset binary format is expected.

dual_DAC:

Selects between dual DAC mode (default) and single DAC mode. This bit is also used

to select input interleaved data.

FIR2x4x:

When set, 4X interpolation of the input data is performed, otherwise 2X interpolation.

CMIX1_mode(1:0):

Determines the mode of FIR1 and final CMIX1 blocks. Settings apply to both A and B

channels. Refer to Table 8 for a detailed description of CMIX1 modes.

Mode

CMIX1_mode(1)

CMIX1_mode(0)

Normal (Low Pass)

High Pass

+FDAC /4

–FDAC/4

CMIX0_mode(1:0): Determines the mode of FIR0 and CMIX0 blocks. Since CMIX0 is located between FIR0

and FIR1, its output is half-rate. Refer to Table 7 for a detailed description of CMIX0

modes. The table below shows the effective Fs/4 or ±Fs/8 mixing with respect to the final

DAC sample rate. Settings apply to both A and B channels.

Mode

CMIX1_mode(1)

CMIX1_mode(0)

Normal (Low Pass)

High Pass

+FDAC /8

–FDAC/8

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