2 GHz Ultralow Distortion

Differential RF/IF Amplifier

AD8352

Rev. A

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FEATURES

Single resistor gain adjust: 3 dB

≤ A

V

≤ 25 dB

Single resistor and capacitor distortion adjust

Differential or single-ended input to differential output

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 5.0 V

Low power dissipation: 37 mA @ 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

AD8352

+

–

Figure 1.

–60

–100

20

220

FREQUENCY (MHz)

–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

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).

Unlike other wideband differential amplifiers, the AD8352 has

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 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.