2 GHz Ultralow Distortion
Differential RF/IF Amplifier
AD8352
FEATURES
FUNCTIONAL BLOCK DIAGRAM
−3 dB bandwidth of 2.2 GHz (AV = 10 dB)
Single resistor gain adjust: 3 dB ≤ AV ≤ 25 dB
Single resistor and capacitor distortion adjust
Input resistance: 3 kΩ, independent of gain (AV)
Differential or single-ended input to differential output
Low noise input stage: 2.7 nV/√Hz RTI @ AV = 10 dB
Low broadband distortion
VCM
VCC
ENB
RGP
RDP
BIAS CELL
+
–
VOP
VON
VIP
VIN
C
D
R
R
D
G
10 MHz: −86 dBc HD2, −82 dBc HD3
70 MHz: −84 dBc HD2, −82 dBc HD3
190 MHz: −81 dBc HD2, −87 dBc HD3
OIP3 of 41 dBm @ 150 MHz
Slew rate: 8 V/ns
Fast settling and overdrive recovery of 2 ns
Single-supply operation: 3 V to 5.0 V
Low power dissipation: 37 mA @ 5 V
Power down capability: 5 mA @ 5 V
RDN
RGN
GND
AD8352
Figure 1.
–60
44
42
40
38
36
34
32
30
28
–65
–70
–75
–80
–85
–90
–95
Fabricated using the high speed XFCB3 SiGe process
APPLICATIONS
Differential ADC drivers
Single-ended to differential conversion
RF/IF gain blocks
SAW filter interfacing
–100
20
40
60
80
100 120 140 160 180 200 220
FREQUENCY (MHz)
Figure 2. IP3 and Third Harmonic Distortion vs. Frequency,
Measured Differentially
GENERAL DESCRIPTION
The AD8352 is a high performance differential amplifier
optimized for RF and IF applications. It achieves better than
80 dB SFDR performance at frequencies up to 200 MHz, and
65 dB beyond 500 MHz, making it an ideal driver for high
speed 12-bit to 16-bit analog-to-digital converters (ADCs).
The device is optimized for wideband, low distortion perform-
ance at frequencies beyond 500 MHz. These attributes, together
with its wide gain adjust capability, make this device the amplifier
of choice for general-purpose IF and broadband applications
where low distortion, noise, and power are critical. In particular,
it is ideally suited for driving not only ADCs, but also mixers,
pin diode attenuators, SAW filters, and multielement discrete
devices. The device is available in a compact 3 mm × 3 mm,
16-lead LFCSP package and operates over a temperature range
of −40°C to +85°C.
Unlike other wideband differential amplifiers, the AD8352 has
buffers that isolate the gain setting resistor (RG) from the signal
inputs. As a result, the AD8352 maintains a constant 3 kΩ input
resistance for gains of 3 dB to 25 dB, easing matching and input
drive requirements. The AD8352 has a nominal 100 Ω differential
output resistance.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2006 Analog Devices, Inc. All rights reserved.
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