Low Power, Low Noise IF and Baseband Dual 16 bit ADC Driver With Digitally Controlled Gain


Product details


2nd harmonic (dBc) 70 3rd harmonic (dBc) 92 @ MHz 10 Acl, min spec gain (V/V) 0.33 Architecture VGA, Fully Differential ADC Driver BW @ Acl (MHz) 1200 Gain (Max) (dB) 22 Gain (Min) (dB) -9.5 Step size (dB) 0.5 Iq per channel (Typ) (mA) 80 Type RF VGA Number of channels (#) 2 Operating temperature range (C) -40 to 85 Slew rate (Typ) (V/us) 5000 Total supply voltage (Max) (+5V=5, +/-5V=10) 5.25 Total supply voltage (Min) (+5V=5, +/-5V=10) 4.5 Vs (Min) (V) 4.5 Vs (Max) (V) 5.25 open-in-new Find other RF VGAs

Package | Pins | Size

WQFN (RTV) 32 25 mm² 5 x 5 open-in-new Find other RF VGAs


  • Accurate, 0.5dB Gain Steps
  • 200Ω Resistive, Differential Input
  • Low Impedance, Differential Output
  • Disable Function for Each Channel
  • Parallel Gain Control
  • SPI Compatible Serial Bus
  • Two Wire, Pulse Mode Control
  • On Chip Register Stores Gain Setting
  • Low Sensitivity of Linearity and Phase to Gain Setting
  • Single 5V Supply Voltage
  • Small Footprint WQFN Package

Key Specifications

  • OIP3: 43dBm @ 200MHz
  • Noise figure 5.5dB
  • Gain step size of 0.5dB
  • Gain step accuracy: 0.05dB
  • Frequency Range of 1200 MHz
  • Supply current 80mA per channel

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The LMH6517 contains two high performance, digitally controlled variable gain amplifiers (DVGA). It has been designed for use in narrowband and broadband IF sampling applications. Typically the LMH6517 drives a high performance ADC in a broad range of mixed signal and digital communication applications such as mobile radio and cellular base stations where automatic gain control (AGC) is required to increase system dynamic range.

Each channel of LMH6517 has an independent, digitally controlled attenuator and a high linearity, differential output amplifier. Each block has been optimized for low distortion and maximum system design flexibility. Each channel can be individually disabled for power savings.

The LMH6517 digitally controlled attenuator provides precise 0.5dB gain steps over a 31.5dB range. On chip digital latches are provided for local storage of the gain setting. Both serial and parallel programming options are provided. A Pulse mode is also offered where simple up or down commands can change the gain one step at a time.

The output amplifier has a differential output allowing large signal swings on a single 5V supply. The low impedance output provides maximum flexibility when driving filters or analog to digital converters.

The LMH6517 operates over the industrial temperature range of −40°C to +85°C. The LMH6517 is available in a 32-Pin, thermally enhanced, WQFN package.

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Technical documentation

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Type Title Date
* Data sheet Low Pwr, Low Noise, IF& Basebnd, Dual 16-bit ADC Drvr w/Dig Cntrlld Gain datasheet (Rev. K) Mar. 13, 2013
E-book The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017
Technical article Part 2 - Mitigating common mode noise Nov. 03, 2014
Application note AN-1719 Noise Figure Analysis Fully Differential Amplifier (Rev. A) May 01, 2013
User guide AN-2081 LMH6517EVAL-R1 Evaluation Board (Rev. B) May 01, 2013
Application note AN-2235 Ckt Brd Design for LMH6517/21/22 & Other H-Sp IF/RF F Amp (Rev. A) May 01, 2013
User guide AN-1942 LMH6517 Evaluation Board (Rev. B) Apr. 26, 2013
Application note Using High Speed Diff Amp to Drive ADCs (Rev. A) Apr. 26, 2013
User guide High-IF Sub-sampling Receiver Subsystem User Guide Jan. 27, 2012
Application note A Walk Along the Signal Path (High-Speed Signal Path) Mar. 30, 2005

Design & development

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Hardware development

document-generic User guide

The LMH6517EVAL evaluation board is designed to aid in the characterization of TI`s High Speed LMH6517 Digital Controlled Variable Gain Amplifier. Use the evaluation board as a guide for high frequency layout and as a tool to aid in device testing and characterization.

The LMH6517 DVGA has (...)

Design tools & simulation

SNAC012.ZIP (3259 KB)

CAD/CAE symbols

Package Pins Download
WQFN (RTV) 32 View options

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