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AD9767AST Arkusz danych(PDF) 17 Page - Analog Devices

Numer części AD9767AST
Szczegółowy opis  14-Bit, 125 MSPS Dual TxDAC D/A Converter
PDF  27 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD9767AST Arkusz danych(HTML) 17 Page - Analog Devices

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REV. B
AD9767
–17–
(“Q DAC”)
IOUTA
QOUTA
QOUTB
DCOM
FSADJ2
REFIO
SLEEP
RSET2
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
RSET1
2k
RCAL
220
500
INPUT
LATCHES
50
500
50
500
50
DAC
LATCHES
DAC
DAC
LATCHES
DAC
INPUT
LATCHES
WRT1
WRT2
ACOM
AD9767
U1
U2
LOIPP
LOIPN
2
PHASE
SPLITTER
REFIN
VGAIN
GAIN
CONTROL
TXOPP
TXOPN
GAIN
CONTROL
SCALE
FACTOR
TEMPERATURE
COMPENSATION
MODOPN
MODOPP
VCC
VCC
3V
500
500
IOUTB
(“I DAC”)
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
c11
cu1
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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