2 GHz Ultralow Distortion
Differential RF/IF Amplifier
AD8352
Rev. B
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FEATURES
−3 dB bandwidth of 2.2 GHz (A
V
= 10 dB)
Single resistor gain adjust: 3 dB ≤ A
V
≤ 25 dB
Single resistor and capacitor distortion adjust
Input resistance: 3 kΩ, independent of gain (A
V
)
Differential or single-ended input to differential output
Low noise input stage: 2.7 nV/√Hz RTI @ A
V
= 10 dB
Low broadband distortion
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 5.5 V
Low power dissipation: 37 mA typical @ 5 V
Power-down capability: 5 mA @ 5 V
Fabricated using the high speed XFCB3 SiGe process
APPLICATIONS
Differential ADC drivers
Single-ended-to-differential conversion
RF/IF gain blocks
SAW filter interfacing
FUNCTIONAL BLOCK DIAGRAM
ENB
VCM
VOP
VON
GND
RGP
RDP
RDN
RGN
VIP
VIN
BIAS CELL
VCC
C
D
R
D
R
G
AD8352
+
–
5728-001
Figure 1.
60
–100
20 220
FREQUENCY (MHz)
IP3 (dBm)
HD3 (dBc)
–65
–70
–75
–80
–85
–90
–95
44
28
42
40
38
36
34
32
30
40 60 80 100 120 140 160 180 200
05728-002
Figure 2. Third Harmonic Distortion (HD3) and IP3 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).
Unlike other wideband differential amplifiers, the AD8352 has
buffers that isolate the gain setting resistor (R
G
) 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.
The device is optimized for wideband, low distortion performance
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. It is ideally
suited for driving not only ADCs but also mixers, pin diode
attenuators, SAW filters, and multi-element discrete devices. The
device is available in a compact 3 mm × 3 mm, 16-lead LFCSP
and operates over a temperature range of −40°C to +85°C.
