Low Distortion

Differential RF/IF Amplifier

Data Sheet

AD8351

Rev. D

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FEATURES

−3 dB bandwidth of 2.2 GHz for AV = 12 dB

Single resistor programmable gain: 0 dB ≤ AV ≤ 26 dB

Differential interface

Low noise input stage 2.7 nV/√Hz at AV = 10 dB

Low harmonic distortion

−79 dBc second at 70 MHz

−81 dBc third at 70 MHz

OIP3 of 31 dBm at 70 MHz

Single-supply operation: 3 V to 5.5 V

Low power dissipation: 28 mA at 5 V

Adjustable output common-mode voltage

Fast settling and overdrive recovery

Slew rate of 13,000 V/μs

Power-down capability

APPLICATIONS

Differential ADC drivers

Single-ended-to-differential conversion

IF sampling receivers

RF/IF gain blocks

SAW filter interfacing

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

GENERAL DESCRIPTION

The AD8351 is a low cost differential amplifier useful in RF and

IF applications up to 2.2 GHz. The voltage gain can be set from

unity to 26 dB using a single external gain resistor. The AD8351

provides a nominal 150 Ω differential output impedance. The

excellent distortion performance and low noise characteristics

of this device allow for a wide range of applications.

The AD8351 is designed to satisfy the demanding performance

requirements of communications transceiver applications. The

device can be used as a general-purpose gain block, an ADC

driver, and a high speed data interface driver, among other

functions. The AD8351 can also be used as a single-ended-to-

differential amplifier with similar distortion products as in the

differential configuration. The exceptionally good distortion

performance makes the AD8351 an ideal solution for 12-bit and

14-bit IF sampling receiver designs.

Fabricated in Analog Devices, Inc., high speed XFCB process,

the AD8351 has high bandwidth that provides high frequency

performance and low distortion. The quiescent current of the

AD8351 is 28 mA typically. The AD8351 amplifier comes in a

compact 10-lead MSOP package or in a 16-lead LFCSP package,

and operates over the temperature range of −40°C to +85°C.

VOCM

VPOS

OPHI

OPLO

COMM

PWUP

RGP1

INHI

INLO

RGP2

AD8351

BIAS CELL

0

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

+

2

3

AD8351 WITH 10dB OF

GAIN DRIVING THE

AD6645 (RL = 1kΩ)

ANALOG INPUT = 70MHz

ENCORE = 80MHz

SNR = 69.1dB

FUND = –1.1dBFS

HD2 = –78.5dBc

HD3 = –80.7dBc

THD = –75.9dBc

SFDR = 78.2dBc

25Ω

RG

200Ω

100nF

25Ω

100nF

AD8351

AD6645

14-BIT

ADC

INHI

INLO