參數(shù)資料
型號(hào): AD9767AST
廠商: ANALOG DEVICES INC
元件分類: DAC
英文描述: 14-Bit, 125 MSPS Dual TxDAC+ D/A Converter
中文描述: DUAL, PARALLEL, WORD INPUT LOADING, 0.035 us SETTLING TIME, 14-BIT DAC, PQFP48
封裝: MS-026BBC, LQFP-48
文件頁(yè)數(shù): 17/27頁(yè)
文件大小: 469K
代理商: AD9767AST
REV. B
AD9767
–17–
(
Q DAC
)
FSADJ2
IOUTA
QOUTA
QOUTB
DCOM
REFIO
SLEEP
R
1.9k
0.1 F
CLK2
Q DATA
INPUT
I DATA
INPUT
DVDD
AVDD
500
50
500
500
IIPP
IIPN
IIQP
IIQN
AD6122
CLK1
FSADJ1
R
SET1
2k
R
CAL
220
500
INPUT
LATCHES
50
500
50
500
50
LADAC
DAC
DAC
LATCHES
DAC
INPUT
LATCHES
WRT1
WRT2
ACOM
AD9767
(
I DAC
)
U1
U2
LOIPP
LOIPN
2
PHASE
SPLITTER
REFIN
VGAIN
GAIN
CONTROL
TXOPP
TXOPN
GAIN
CONTROL
SCALE
TEMPERATURE
COMPENSATION
MODOPN
MODOPP
V
CC
V
CC
3V
500
500
IOUTB
Figure 42. CDMA Transmit Application Using AD9767 and AD6122
Figure 41 shows the AD9767, when used with the AD8346,
reconstructing a wideband CDMA signal at 2.4 GHz. The
baseband signal is being sampled at 65 MSPS and has a chip
rate of 8M chips.
==
80
120
70
90
110
50
60
100
40
CENTER 2.4GHz
3MHz
SPAN 30MHz
130
30
d
c11
cu1
C0
C0
c11
FREQUENCY
Figure 41. CDMA Signal, 8 M Chips Sampled at 65 MSPS,
Recreated at 2.4 GHz Adjacent Channel Power > 60 dBm
Figure 42 shows an example of the AD9767 used in a W-CDMA
transmitter application using the AD6122 CDMA 3 V IF sub-
system. The AD6122 has functions, such as external gain con-
trol and low distortion characteristics, needed for the superior
Adjacent Channel Power (ACP) requirements of W-CDMA.
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