AD8351_15 Datasheet, PDF (1/19 Pages) Analog Devices – Low Distortion Differential RF/IF Amplifier

Data Sheet
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
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
Low Distortion
Differential RF/IF Amplifier
AD8351
FUNCTIONAL BLOCK DIAGRAM
PWUP
AD8351
BIAS CELL
RGP1
VOCM
VPOS
INHI
INLO
RGP2
OPHI
OPLO
COMM
0
–10
–20
–30
–40
–50
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
–60
–70
–80
–90
+
–100
–110
–120
–130
INHI
R_G
200Ω
INLO
100nF _25Ω
AD8351
AD6645
14-BIT
ADC
100nF ^25Ω
2
3
Figure 1.
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.
Rev. D
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