2.9 GHz Ultralow Distortion

RF/IF Differential Amplifier

ADL5561

FEATURES

Low supply current: 40 mA

Pin-strappable gain adjust: 6 dB, 12 dB, 15.5 dB

Differential or single-ended input to differential output

Low broadband distortion (Av = 6 dB)

10 MHz: −94 dBc HD2, −87 dBc HD3

70 MHz: −98 dBc HD2, −87 dBc HD3

140 MHz: −95 dBc HD2, −87 dBc HD3

250 MHz: −80 dBc HD2, −73 dBc HD3

IMD3s of −86 dBc @ 250 MHz center

Slew rate: 9.8 V/ns

Fast settling of 2 ns and overdrive recovery of 3 ns

Single-supply operation: 3 V to 3.6 V

Power-down control

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

VIP2

ENBL

VCOM

VOP

GND

VIP1

VIN1

VIN2

ADL5561

GND

VCC

VON

Figure 1.

GENERAL DESCRIPTION

The ADL5561 is a high performance differential amplifier

optimized for RF and IF applications. The amplifier offers low

noise of 2.1 nV/√Hz and excellent distortion performance over

a wide frequency range, making it an ideal driver for high speed

8-bit to 16-bit analog-to-digital converters (ADCs).

The ADL5561 provides three gain levels of 6 dB, 12 dB, and 15.5 dB

through a pin-strappable configuration. For the single-ended

input configuration, the gains are reduced to 5.6 dB, 11.1 dB, and

14.1 dB. Using an external series input resistor expands the

amplifier gain flexibility and allows for any gain selection from

0 dB to 15.5 dB.

The quiescent current of the ADL5561 is typically 40 mA and,

when disabled, consumes less than 3 mA, offering excellent

input-to-output isolation.

The device is optimized for wideband, low distortion performance.

These attributes, together with its adjustable gain capability,

make this device the amplifier of choice for general-purpose IF

and broadband applications where low distortion, noise, and power

are critical. This device is optimized for the best combination of

slew speed, bandwidth, and broadband distortion. These attributes

allow it to drive a wide variety of ADCs and make it ideally suited

for driving mixers, pin diode attenuators, SAW filters, and multi-

element discrete devices.

Fabricated on the Analog Devices, Inc., high speed SiGe process,

the ADL5561 is supplied in a compact 3 mm × 3 mm, 16-lead

LFCSP package and operates over the temperature range of

−40°C to +85°C.

Rev. B

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