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OIP3 (dBm)
VOLTAGE GAIN (dB)
f = 100 MHz
P
OUT
= 4dBm / Tone
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LMH6881
SNOSC72F –JUNE 2012–REVISED FEBRUARY 2015
LMH6881 DC to 2.4-GHz, High-Linearity, Programmable Differential Amplifier
1 Features 3 Description
The LMH6881 is a high-speed, high-performance,
1
• Small Signal Bandwidth: 2400 MHz
programmable differential amplifier. With a bandwidth
• OIP3 at 100 MHz: 44 dBm
of 2.4 GHz and high linearity of 44 dBm OIP3, the
• HD3 at 100 MHz: −100 dBc
LMH6881 is suitable for a wide variety of signal
conditioning applications.
• Noise Figure: 9.7 dB
• Voltage Gain Range: 26 dB to 6 dB
The LMH6881 programmable differential amplifier
combines the best of both fully differential amplifiers
• Voltage Gain Step Size: 0.25 dB
and variable-gain amplifiers. The device offers
• Input Impedance: 100 Ω
superior noise and distortion performance over the
• Parallel and Serial Gain Control
entire gain range without external resistors, enabling
the use of just one device and one design for multiple
• Power Down Capability
applications requiring different gain settings.
2 Applications
The LMH6881 is an easy-to-use amplifier that can
replace both fully differential, fixed-gain amplifiers as
• Oscilloscope Front End
well as variable-gain amplifiers. The LMH6881
• Spectrum Analyzer Gain Block
requires no external gain-setting components and
• Differential ADC Driver
supports gain settings from 6 dB to 26 dB with small,
accurate 0.25-dB gain steps. With an input
• Differential Cable Driver
impedance of 100 Ω, the LMH6881 is easy to drive
• IF/RF and Baseband Gain Blocks
from a variety of sources such as mixers or filters.
• Medical Imaging
The LMH6881 also supports 50-Ω single-ended
signal sources and supports both DC- and AC-
OIP3 vs Voltage Gain
coupled applications.
Parallel gain control allows the LMH6881 to be
soldered down in a fixed-gain so that no control
circuit is required. If dynamic-gain control is desired,
the LMH6881 can be changed with SPI™ serial
commands or with the parallel pins.
The LMH6881 is fabricated in TI’s CBiCMOS8
proprietary complementary silicon germanium
process and is available in a space-saving, thermally
enhanced 24-pin lead quad WQFN package. The
same amplifier is offered in a dual package as the
LMH6882.
Device Information
(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
LMH6881 WQFN (24) 4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
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