AD9767AST datasheet(17/27 Pages) AD

17 / 27 page

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

IIPP

IIPN

IIQP

IIQN

AD6122

CLK1

FSADJ1

RSET1

RCAL

220

500

INPUT

LATCHES

500

DAC

LATCHES

DAC

LATCHES

DAC

INPUT

LATCHES

WRT1

WRT2

ACOM

AD9767

LOIPP

LOIPN

PHASE

SPLITTER

REFIN

VGAIN

GAIN

CONTROL

TXOPP

TXOPN

GAIN

CONTROL

SCALE

FACTOR

TEMPERATURE

COMPENSATION

MODOPN

MODOPP

VCC

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

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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