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AD6122ARS

CDMA 3 V Transmitter IF Subsystem with Integrated Voltage Regulator

Analog Devices 

INPUT INTERFACES

The AD6122 interfaces to CDMA baseband converters provid-

ing either IF or baseband outputs. The baseband input is pro-

vided by direct connection of the baseband converter’s baseband

output to the baseband input of the AD6122 (Figure 30). The

IF amplifier’s gain control is provided by connection of the

transmit AGC DAC’s output on the baseband converter, through a

low-pass filter to the VGAIN pin on the AD6122.

AD6122

PD1

PD2

VCC

LDOE

LDOB

LDOC

LDOGND

TEMPERATURE

COMPENSATION

LOW

DROPOUT

REGULATOR

DGND

LOIPP

،2

LOIPN

DVCC

AD6122

GAIN

CONTROL

SCALE

FACTOR

Q

I

VGAIN

TX AGC DAC

REFIN

EXT REF IN

REFOUT

IFVCC

IFGND

IIPP

IIPN

MODCMREF

I OUTPUT

I OUTPUT

VCM REF IN

QIPN

QIPP

MODOPP

MODOPN

VCC

Q OUTPUT

Q OUTPUT

VCC

CDMA

BASEBAND

IC

TXOPP

TXOPN

TXVCC

IFGND

IFINP

IFINN

Figure 30. Typical Connections to Baseband IC Using I and Q Inputs with SSOP Package

REV. B

–15–

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