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LMH6881

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2.4GHz Programmable Differential Amplifier with Gain Control

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Data sheet

LMH6881

ACTIVE
Data sheet Order now

Product details

2nd harmonic (dBc) 70 3rd harmonic (dBc) 76 Frequency of harmonic distortion measurement (MHz) 200 Acl, min spec gain (V/V) 2 Architecture Fully Differential ADC Driver, VGA BW at Acl (MHz) 2400 Gain (max) (dB) 26 Gain (min) (dB) 6 Step size (dB) 0.25 Type RF VGA Iq per channel (typ) (mA) 50 Number of channels 1 Rating Catalog Operating temperature range (°C) -40 to 85 Slew rate (typ) (V/µs) 6000 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.25 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 4.75 Vs (min) (V) 4.75 Vs (max) (V) 5.25
2nd harmonic (dBc) 70 3rd harmonic (dBc) 76 Frequency of harmonic distortion measurement (MHz) 200 Acl, min spec gain (V/V) 2 Architecture Fully Differential ADC Driver, VGA BW at Acl (MHz) 2400 Gain (max) (dB) 26 Gain (min) (dB) 6 Step size (dB) 0.25 Type RF VGA Iq per channel (typ) (mA) 50 Number of channels 1 Rating Catalog Operating temperature range (°C) -40 to 85 Slew rate (typ) (V/µs) 6000 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.25 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 4.75 Vs (min) (V) 4.75 Vs (max) (V) 5.25
WQFN (RTW) 24 16 mm² 4 x 4
  • Small Signal Bandwidth: 2400 MHz
  • OIP3 at 100 MHz: 44 dBm
  • HD3 at 100 MHz: –100 dBc
  • Noise Figure: 9.7 dB
  • Voltage Gain Range: 26 dB to 6 dB
  • Voltage Gain Step Size: 0.25 dB
  • Input Impedance: 100 Ω
  • Parallel and Serial Gain Control
  • Power Down Capability
  • Small Signal Bandwidth: 2400 MHz
  • OIP3 at 100 MHz: 44 dBm
  • HD3 at 100 MHz: –100 dBc
  • Noise Figure: 9.7 dB
  • Voltage Gain Range: 26 dB to 6 dB
  • Voltage Gain Step Size: 0.25 dB
  • Input Impedance: 100 Ω
  • Parallel and Serial Gain Control
  • Power Down Capability

The LMH6881 is a high-speed, high-performance, programmable differential amplifier. With a bandwidth of 2.4 GHz and high linearity of 44 dBm OIP3, the LMH6881 is suitable for a wide variety of signal conditioning applications.

The LMH6881 programmable differential amplifier combines the best of both fully differential amplifiers and variable-gain amplifiers. The device offers superior noise and distortion performance over the entire gain range without external resistors, enabling the use of just one device and one design for multiple applications requiring different gain settings.

The LMH6881 is an easy-to-use amplifier that can replace both fully differential, fixed-gain amplifiers as well as variable-gain amplifiers. The LMH6881 requires no external gain-setting components and supports gain settings from 6 dB to 26 dB with small, accurate 0.25-dB gain steps. With an input impedance of 100 Ω, the LMH6881 is easy to drive from a variety of sources such as mixers or filters. The LMH6881 also supports 50-Ω single-ended signal sources and supports both DC- and AC-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.

The LMH6881 is a high-speed, high-performance, programmable differential amplifier. With a bandwidth of 2.4 GHz and high linearity of 44 dBm OIP3, the LMH6881 is suitable for a wide variety of signal conditioning applications.

The LMH6881 programmable differential amplifier combines the best of both fully differential amplifiers and variable-gain amplifiers. The device offers superior noise and distortion performance over the entire gain range without external resistors, enabling the use of just one device and one design for multiple applications requiring different gain settings.

The LMH6881 is an easy-to-use amplifier that can replace both fully differential, fixed-gain amplifiers as well as variable-gain amplifiers. The LMH6881 requires no external gain-setting components and supports gain settings from 6 dB to 26 dB with small, accurate 0.25-dB gain steps. With an input impedance of 100 Ω, the LMH6881 is easy to drive from a variety of sources such as mixers or filters. The LMH6881 also supports 50-Ω single-ended signal sources and supports both DC- and AC-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.
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Technical documentation

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Type Title Date
* Data sheet LMH6881 DC to 2.4-GHz, High-Linearity, Programmable Differential Amplifier datasheet (Rev. F) PDF | HTML 06 Feb 2015
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017
Technical article Part 1 - Avoid common missteps with the common mode 13 Aug 2014
EVM User's guide AN-2267 LMH6881 Evaluation Board (Rev. C) 01 May 2013
More literature Featured High Speed Differential Amplifiers 23 Oct 2012
Application note LMH6881 - Making Differential Amplifier Design Easy (Rev. A) 18 Oct 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LMH6881EVAL — LMH6881 Evaluation Module

The LMH6881EVAL is an easy to use, fully assembled, evaluation kit for the LMH6881 Programmable Gain Amplifier. The LMH6881EVAL has been designed to provide high performance measurements using single ended test equipment. The LMH6881EVAL has also been designed to be modified by the user for (...)
User guide: PDF
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Simulation model

LMH6881 ADS Model

SNOM341.ZIP (65 KB) - Spice Model
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Simulation model

LMH6881 PSpice Model

SNAM246.ZIP (145 KB) - PSpice Model
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Simulation model

LMH6881 TINA-TI Reference Design

SNOM334.TSC (3443 KB) - TINA-TI Reference Design
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Simulation model

LMH6881 TINA-TI Spice Model

SNOM335.ZIP (11 KB) - TINA-TI Spice Model
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Reference designs

TIDA-00094 — Quad-Channel 250-Msps Digitizer with Variable Gain Amplifier Reference Design

This reference design shows a quad channel, 14-bit, 250-Msps digitizer with wide input range using the LMH6881 programmable differential amplifier and ADS4449 quad-channel, 14-bit, 250-Msps ADC. This combination allows an input voltage range of approximately 1 Vpp to 100 uVpp (4 dBm to -75 dBm) (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00093 — Optimizing THS4509 to Drive High Speed ADCs Reference Design

This reference design shows the ability of the high-speed amplifier, THS4509 to perform single-ended to differential conversion to drive high-speed analog-to-digital converters (ADCs) while maintaining excellent noise and distortion performance. Performance versus input frequency is shown for both (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00092 — Optimizing LMH6554 to Drive High Speed ADCs

This reference design shows the ability of the high-speed amplifier, LMH6554, to perform single-ended to differential conversion to drive high-speed analog-to-digital converters (ADCs) while maintaining excellent noise and distortion performance. Performance versus input frequency is shown for both (...)
Design guide: PDF
Schematic: PDF
Package Pins Download
WQFN (RTW) 24 View options
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