Datasheet

Product data sheet Rev. 5 — 31 January 2012 26 of 43

NXP Semiconductors

DAC1405D750

Dual 14-bit DAC, up to 750 Msps; 4 and 8 interpolating

10.7 Quadrature modulator and Numerically Controlled Oscillator (NCO)

The quadrature modulator allows the 14-bit I and Q-data to be mixed with the carrier

signal generated by the NCO.

The frequency of the Numerically Controlled Oscillator (NCO) is programmed over 32-bit

and allows the sign of the sine component to be inverted in order to operate positive or

negative, lower or upper single sideband up-conversion.

Table 36. Interpolation filter coefficients

First interpolation filter Second interpolation filter Third interpolation filter

Lower Upper Value Lower Upper Value Lower Upper Value

H(1) H(55) 4 H(1) H(23) 2 H(1) H(15) 39

H(2) H(54) 0 H(2) H(22) 0 H(2) H(14) 0

H(3) H(53) 13 H(3) H(21) 17 H(3) H(13) 273

H(4) H(52) 0 H(4) H(20) 0 H(4) H(12) 0

H(5) H(51) 34 H(5) H(19) 75 H(5) H(11) 1102

H(6) H(50) 0 H(6) H(18) 0 H(6) H(10) 0

H(7) H(49) 72 H(7) H(17) 238 H(7) H(9) 4964

H(8) H(48) 0 H(8) H(16) 0 H(8) - 8192

H(9) H(47) 138 H(9) H(15) 660 - - -

H(10) H(46) 0 H(10) H(14) 0 - - -

H(11) H(45) 245 H(11) H(13) 2530 - - -

H(12) H(44) 0 H(12) - 4096 - - -

H(13) H(43) 408------

H(14)H(42)0------

H(15) H(41) 650 - - - - - -

H(16)H(40)0------

H(17) H(39) 1003------

H(18)H(38)0------

H(19) H(37) 1521 - - - - - -

H(20)H(36)0------

H(21) H(35) 2315------

H(22)H(34)0------

H(23) H(33) 3671 - - - - - -

H(24)H(32)0------

H(25) H(31) 6642------

H(26)H(30)0------

H(27) H(29) 20756 - - - - - -

H(28)-32768------