參數(shù)資料
型號(hào)： DAC1208D650HN
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： DAC
英文描述： Dual 12-bit DAC; up to 650 Msps; 2×, 4× or 8× interpolating
中文描述： 12-BIT DAC, PQCC64
封裝： 9 X 9 MM, 0.85 MM HEIGHT, PLASTIC, SOT804-3, VQFN-64
文件頁(yè)數(shù)： 27/98頁(yè)
文件大?。?/td> 557K
代理商： DAC1208D650HN
DAC1208D650
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 2 — 14 December 2010
27 of 98
NXP Semiconductors
DAC1208D650
2
×
, 4
×
or 8
×
interpolating DAC with JESD204A interface
10.6 Quadrature modulator and Numerically Controlled Oscillator (NCO)
The quadrature modulator allows the 12-bit I and Q data to be mixed with the carrier
signal generated by the NCO.
The frequency of the NCO is programmed over 32 bits and the sign of the sine component
can be inverted in order to operate positive or negative, lower or upper single sideband
up-conversion.
10.6.1
NCO in 32-bit
When using the NCO, the frequency can be set by the four registers FREQNCO_LSB,
FREQNCO_LISB, FREQNCO_UISB and FREQNCO_MSB over 32 bits.
The frequency for the NCO in 32-bit is calculated as follows:
(1)
where M is the decimal representation of FREQ_NCO[31:0].
The phase of the NCO can be set from 0
°
to 360
°
by both registers PHINCO_LSB and
PHINCO_MSB over 16 bits.
The default setting is f
NCO
= 96 MHz when f
s
= 640 Msps and the default phase is 0
°
.
10.6.2
Low-power NCO
When using the low-power NCO, the frequency can be set by the five MSBs of register
FREQNCO_MSB.
The frequency for the low-power NCO is calculated as follows:
(2)
where M is the decimal representation of FREQ_NCO[31:27].
The phase of the low-power NCO can be set by the five MSBs of the register
PHINCO_MSB.
10.6.3
Minus_3dB
During normal use, a full-scale pattern will also be full-scale at the output of the DAC.
Nevertheless, when the I and Q data are simultaneously close to full-scale, some clipping
can occur and the minus_3dB function can be used to reduce the gain in the modulator by
3 dB. This is to keep a full-scale range at the output of the DAC without added interferers.
10.7 x / (sin x)
The roll-off effect of the DAC causes a selectable FIR filter to be inserted to compensate
for the (sin x) / x effect. This filter introduces a DC loss of 3.4 dB. The coefficients are
represented in
Table 11
.
f
NCO
M
--------------
f
s
×
2
=
f
NCO
M
--------------
f
s
×
2
5
=
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