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参数资料
| 型号： | DAC5688IRGCTG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | DAC |
| 英文描述： | PARALLEL, WORD INPUT LOADING, 0.0104 us SETTLING TIME, 16-BIT DAC, PQCC64 |
| 封装： | 9 X 9 MM, GREEN, PLASTIC, VQFN-64 |
| 文件页数： | 25/56页 |
| 文件大小： | 1321K |
| 代理商： | DAC5688IRGCTG4 |
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Frequency
Register
32
Accumulator
32
RESET
CLK
FDAC
NCOSYNC
via
nco_sel(1:0)
32
Phase
Register
16
LookUp
Table
16
sin
cos
NCO +
ref
NCO_CLK
232
I
OUT(t) + IIN(t) cos 2
pf
NCOt )
d * QIN(t) sin 2pfNCOt ) d
2
(mixer_gain*1)
+
d + 2p
phase(15 : 0) 2
16
www.ti.com
SLLS880C – DECEMBER 2007 – REVISED AUGUST 2010
Full Complex Mixer (FMIX)
The full complex Mixer (FMIX) block uses a Numerically Controlled Oscillator (NCO) with a 32-bit frequency
register phaseadd(31:0) and a 16-bit phase register phaseoffset(15:0) to provide sin and cos for mixing. The
NCO tuning frequency is programmed in CONFIG8 through CONFIG11 registers. Phase offset is programmed in
CONFIG6 and CONFIG7 registers. A block-diagram of the NCO is shown below in Figure 29.
Figure 29. Block-Diagram of the NCO
Synchronization of the NCO occurs by resetting the NCO accumulator to zero. The synchronization source is
selected by CONFIG22 nco_sel(1:0). Frequency word fref in the phaseadd register is added to the accumulator
every clock cycle, fDAC. The output frequency of the NCO is
(1)
Treating channels A and B as a complex vector I + I×Q where I(t) = A(t) and Q(t) = B(t), the output of FMIX
IOUT(t) and QOUT(t) is
(2)
(3)
Where t is the time since the last resetting of the NCO accumulator, d is the phase offset value and mixer_gain
is either 0 or 1. d is given by:
(4)
The maximum output amplitude of FMIX occurs if IIN(t) and QIN(t) are simultaneously full scale amplitude and the
sine and cosine arguments 2pfNCOt + d (2N-1)×p/4 (N = 1, 2, ...).
With CONFIG5 mixer_gain = 0, the gain through FMIX is sqrt(2)/2 or –3 dB. This loss in signal power is in most
cases undesirable, and it is recommended that the gain function of the QMC block be used to increase the signal
by 3 dB to compensate. With mixer_gain = 1, the gain through FMIX is sqrt(2) or + 3 dB, which can cause
clipping of the signal if IIN(t) and QIN(t) are simultaneously near full scale amplitude and should therefore be used
with caution.
Copyright 2007–2010, Texas Instruments Incorporated
31
Product Folder Link(s): DAC5688
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