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DAC5687MPZPEP データシート(PDF) 22 Page - Texas Instruments

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部品番号 DAC5687MPZPEP
部品情報  16-BIT 500-MSPS 2쨈??쨈 INTERPOLATING DUAL-CHANNEL DIGITAL-TO-ANALOG CONVERTER (DAC)
PDF  75 Pages
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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DAC5687MPZPEP データシート(HTML) 22 Page - Texas Instruments

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Peak-to-Average Ratio − dB
3
5
7
9
11
13
15
G041
10−6
1 Carrier
2 Carriers
4 Carriers
10−4
10−2
100
DETAILED DESCRIPTION
Modes of Operation
DAC5687-EP
SGLS333 – JUNE 2006
Test Methodology (continued)
Figure 29. WCDMA TM1 Cumulative Complementary Distribution Function for 1, 2, and 4 Carriers
The DAC5687 has six digital signal processing blocks: FIR1 and FIR2 (interpolate by two digital filters), FMIX
(fine frequency mixer), QMC (quadrature modulation phase correction), FIR3 (interpolate by two digital filter) and
CMIX (coarse frequency mixer). The modes of operation, listed in Table 1, enable or bypass the blocks to
produce different results. The modes are selected by registers CONFIG1, CONFIG2, and CONFIG3 (0x02,
0x03, and 0x04). Block diagrams for each mode (x2, x4, x4L, and x8) are shown in Figure 30 through Figure 33.
Table 1. DAC5687 Modes of Operation
MODE
FIR1
FIR2
FMIX
QMC
FIR3
CMIX
FULL BYPASS
–
–
–
–
–
–
X2
–
–
–
–
ON
–
X2 FMIX
–
–
ON
–
ON
–
X2 QMC
–
–
–
ON
ON
–
X2 FMIX QMC
–
–
ON
ON
ON
–
X2 CMIX
–
–
–
–
ON
ON
X2 FMIX CMIX
–
–
ON
–
ON
ON
X2 QMC CMIX
–
–
–
ON(1)
ON
ON
X2 FMIX QMC CMIX
–
–
ON
ON(1)
ON
ON
X4
ON
ON
–
–
–
–
X4 FMIX(2)
ON
ON
ON
–
–
–
X4 QMC(2)
ON
ON
–
ON
–
–
X4 FMIX QMC
ON
ON
ON
ON
–
–
X4 CMIX
ON
ON
–
–
–
ON
X4L
ON
–
–
–
ON
–
(1)
The QMC phase correction will be eliminated by the CMIX, so the QMC phase should be set to zero.
The QMC gain settings can still be used to adjust the signal path gain as needed.
(2)
fDAC limited to maximum clock rate for the NCO and QMC, (See the AC specs).
22
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