DAC5687IPZP datasheet(26/79 Pages) TI

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DAC5687

SLWS164E – FEBRUARY 2005 – REVISED SEPTEMBER 2006

input data MSB to LSB order is reversed, DA[15] = LSB and DA[0] = MSB.

rev_bbus: When cleared, DB input data MSB to LSB order is DB[15] = MSB and DB[0] = LSB. When set, DB

input data MSB to LSB order is reversed, DB[15] = LSB and DB[0]= MSB.

fir_bypass: When set, all interpolation filters are bypassed (interp(1:0) setting has no effect). QMC and NCO

blocks are functional in this mode up to fDAC = 250 MHz, limited by the input data rate.

full_bypass: When set, all filtering, QMC and NCO functions are bypassed.

BIT 7

BIT 0

nco

nco_gain

qmc

cm_mode(3:0)

invsinc

nco: When set, the NCO is enabled.

nco_gain: When set, the data output of the NCO is increased by 2

×.

qmc: Quadrature modulator gain and phase correction is enabled when set.

cm_mode(3:0): Controls fDAC/2 or fDAC/4 mixer modes for the coarse mixer block.

Table 3. Coarse Mixer Sequences

cm_mode(3:0)

Mixing Mode

Sequence

00XX

No mixing

0100

fDAC/2

DAC A = {–A +A –A +A …}

DAC B = {–B +B –B +B …}

0101

fDAC/2

DAC A = {–A +A –A +A …}

DAC B = {+B –B +B –B …}

0110

fDAC/2

DAC A = {+A –A +A –A …}

DAC B = {–B +B –B +B …}

0111

fDAC/2

DAC A = {+A –A +A –A …}

DAC B = {+B –B +B –B …}

1000

fDAC/4

DAC A = {+A –B –A +B …}

DAC B = {+B +A –B –A …}

1001

fDAC/4

DAC A = {+A –B –A +B …}

DAC B = {–B –A +B +A …}

1010

fDAC/4

DAC A = {–A +B +A –B …}

DAC B = {+B +A –B –A …}

1011

fDAC/4

DAC A = {–A +B +A –B …}

DAC B = {–B –A +B +A …}

1100

–fDAC/4

DAC A = {+A +B –A –B …}

DAC B = {+B –A –B +A …}

1101

–fDAC/4

DAC A = {+A +B –A –B …}

DAC B = {–B +A +B –A …}

1110

–fDAC/4

DAC A = {–A –B +A +B …}

DAC B = {+B –A –B +A …}

1111

–fDAC/4

DAC A = {–A –B +A +B …}

DAC B = {–B +A +B –A …}

invsinc: Enables the invsinc compensation filter when set.

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