AD9767-EB Просмотр технического описания (PDF) - Analog Devices

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AD9767-EB

14-Bit, 125 MSPS Dual TxDAC+® D/A Converter

Analog Devices 

AD9767

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.

–30

–40

–50

–60 ==

–70

–80

–90

–100

–110

c11

c11

–120

C0

–130

CENTER 2.4GHz

cu1

C0

3MHz

FREQUENCY

cu1

SPAN 30MHz

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.

3V

DVDD AVDD

CLK1

RSET1

2k⍀

AD9767

(“I DAC”)

FSADJ1

I DATA

INPUT

INPUT

LATCHES

U1

DAC

LATCHES

DAC

IOUTA

IOUTB

50⍀

500⍀

500⍀

50⍀

500⍀

500⍀

IIPP

IIPN

AD6122

WRT1

WRT2

500⍀

500⍀

LOIPP

LOIPN

،2

PHASE

SPLITTER

Q DATA

INPUT

RSET2

1.9k⍀

RCAL

220⍀

INPUT

LATCHES

(“Q DAC”)

FSADJ2

REFIO

U2

DAC

LATCHES

DAC

QOUTA

QOUTB

SLEEP

ACOM DCOM

CLK2

0.1␮F

50⍀

500⍀

500⍀

50⍀

GAIN

CONTROL

IIQP

MODOPP

IIQN

MODOPN

TEMPERATURE

COMPENSATION

VCC

VCC

REFIN

VGAIN

GAIN

CONTROL

SCALE

FACTOR

TXOPP

TXOPN

Figure 42. CDMA Transmit Application Using AD9767 and AD6122

REV. B

–17–

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