Product
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LMH6401
  • LMH6401
  • LMH6401

LMH6401

ACTIVE

4.5 GHz ultra wideband digital variable gain amplifier

Texas Instruments LMH6401 Product Info

1 April 2026 0

Parameters

2nd harmonic (dBc)

-73

3rd harmonic (dBc)

-80

Frequency of harmonic distortion measurement (MHz)

200

Acl, min spec gain (V/V)

0.5

Architecture

Fully Differential ADC Driver, VGA

BW at Acl (MHz)

4500

Gain (max) (dB)

26

Gain (min) (dB)

-6

Step size (dB)

1

Type

RF VGA

Iq per channel (typ) (mA)

69

Number of channels

1

Rating

Catalog

Operating temperature range (°C)

-40 to 85

Slew rate (typ) (V/µs)

18200

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

Vs (min) (V)

4

Vs (max) (V)

5.25

Package

UQFN-HR (RMZ)-16-9 mm² 3 x 3

Features

  • 3-dB Bandwidth: 4.5 GHz at 26-dB Gain
  • Gain Range: –6 dB to 26 dB in 1-dB Steps
  • Differential Input Impedance: 100 Ω
  • Differential Output with Common-Mode Control
  • Distortion at Max Gain (VO = 2 VPPD, RL = 200 Ω):
    • 200 MHz: HD2 at –73 dBc, HD3 at –80 dBc
    • 500 MHz: HD2 at –68 dBc, HD3 at –72 dBc
    • 1 GHz: HD2 at –63 dBc, HD3 at –63 dBc
    • 2 GHz: HD2 at –58 dBc, HD3 at –54 dBc
  • Output IP3:
    • 43 dBm at 200 MHz
    • 33 dBm at 1 GHz
    • 27 dBm at 2 GHz
  • Output IP2:
    • 67 dBm at 200 MHz
    • 60 dBm at 1 GHz
    • 52 dBm at 2 GHz
  • 8-dB Noise Figure at 1 GHz, RS = 100 Ω
  • 82-ps Rise, Fall Time Pulse Response
  • Supply Operation: 5.0 V at 69 mA
  • Supports Single- and (±) Split-Supply Operation:
    • DC- and AC-Coupled Applications
  • Fabricated on an Advanced Complementary BiCMOS Process
  • 3-mm × 3-mm UQFN-16 Package
  • 3-dB Bandwidth: 4.5 GHz at 26-dB Gain
  • Gain Range: –6 dB to 26 dB in 1-dB Steps
  • Differential Input Impedance: 100 Ω
  • Differential Output with Common-Mode Control
  • Distortion at Max Gain (VO = 2 VPPD, RL = 200 Ω):
    • 200 MHz: HD2 at –73 dBc, HD3 at –80 dBc
    • 500 MHz: HD2 at –68 dBc, HD3 at –72 dBc
    • 1 GHz: HD2 at –63 dBc, HD3 at –63 dBc
    • 2 GHz: HD2 at –58 dBc, HD3 at –54 dBc
  • Output IP3:
    • 43 dBm at 200 MHz
    • 33 dBm at 1 GHz
    • 27 dBm at 2 GHz
  • Output IP2:
    • 67 dBm at 200 MHz
    • 60 dBm at 1 GHz
    • 52 dBm at 2 GHz
  • 8-dB Noise Figure at 1 GHz, RS = 100 Ω
  • 82-ps Rise, Fall Time Pulse Response
  • Supply Operation: 5.0 V at 69 mA
  • Supports Single- and (±) Split-Supply Operation:
    • DC- and AC-Coupled Applications
  • Fabricated on an Advanced Complementary BiCMOS Process
  • 3-mm × 3-mm UQFN-16 Package

Description

The LMH6401 is a wideband, digitally-controlled, variable-gain amplifier (DVGA) designed for dc to radio frequency (RF), intermediate frequency (IF), and high-speed time-domain applications. The device is an ideal analog-to-digital converter (ADC) driver for dc- or ac-coupled applications that require an automatic gain control (AGC).

Noise and distortion performance is optimized to drive ultra-wideband ADCs. The amplifier has an 8-dB noise figure at maximum gain and a –63-dBc harmonic distortion at 1 GHz for full-scale signal levels. The device supports both single- and split-supply operation for driving an ADC. A common-mode reference input pin is provided to align the amplifier output common-mode with the ADC input requirements.

Gain control is performed via an SPI™ interface, allowing a 32-dB gain range from –6 dB to 26 dB in 1-dB steps. A power-down feature is also available through the external PD pin or SPI control.

This level of performance is achieved at a low power level of 345 mW. The operating ambient temperature range is –40°C to 85°C.

The LMH6401 is a wideband, digitally-controlled, variable-gain amplifier (DVGA) designed for dc to radio frequency (RF), intermediate frequency (IF), and high-speed time-domain applications. The device is an ideal analog-to-digital converter (ADC) driver for dc- or ac-coupled applications that require an automatic gain control (AGC).

Noise and distortion performance is optimized to drive ultra-wideband ADCs. The amplifier has an 8-dB noise figure at maximum gain and a –63-dBc harmonic distortion at 1 GHz for full-scale signal levels. The device supports both single- and split-supply operation for driving an ADC. A common-mode reference input pin is provided to align the amplifier output common-mode with the ADC input requirements.

Gain control is performed via an SPI™ interface, allowing a 32-dB gain range from –6 dB to 26 dB in 1-dB steps. A power-down feature is also available through the external PD pin or SPI control.

This level of performance is achieved at a low power level of 345 mW. The operating ambient temperature range is –40°C to 85°C.

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