GAIN 0-5

200

ADC

6

LATCH

RF

LO

½ LMH6517

LMH6517

www.ti.com

SNOSB19J – NOVEMBER 2008 – REVISED NOVEMBER 2011

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

Gain

Check for Samples: LMH6517

1

FEATURES

DESCRIPTION

The

LMH6517

contains

two

high

performance,

2

•

Accurate, 0.5dB Gain Steps

digitally controlled variable gain amplifiers (DVGA). It

•

200

Ω Resistive, Differential Input

has been designed for use in narrowband and

•

Low Impedance, Differential Output

broadband IF sampling applications. Typically the

LMH6517 drives a high performance ADC in a broad

•

Disable Function for Each Channel

range of mixed signal and digital communication

•

Parallel Gain Control

applications such as mobile radio and cellular base

•

SPI Compatible Serial Bus

stations where automatic gain control (AGC) is

required to increase system dynamic range.

•

Two Wire, Pulse Mode Control

•

On Chip Register Stores Gain Setting

Each channel of LMH6517 has an independent,

digitally controlled attenuator and a high linearity,

•

Low Sensitivity of Linearity and Phase to Gain

differential output amplifier. Each block has been

Setting

optimized for low distortion and maximum system

•

Single 5V Supply Voltage

design flexibility. Each channel can be individually

•

Small Footprint WQFN Package

disabled for power savings.

The LMH6517 digitally controlled attenuator provides

APPLICATIONS

precise 0.5dB gain steps over a 31.5dB range. On

•

Cellular Base Stations

chip digital latches are provided for local storage of

the gain setting. Both serial and parallel programming

•

IF Sampling Receivers

options are provided. A Pulse mode is also offered

•

Instrumentation

where simple up or down commands can change the

•

Modems

gain one step at a time.

•

Imaging

The output amplifier has a differential output allowing

large signal swings on a single 5V supply. The low

KEY SPECIFICATIONS

impedance output provides maximum flexibility when

driving filters or analog to digital converters.

•

OIP3: 43dBm @ 200MHz

The

LMH6517

operates

over

the

industrial

•

Noise figure 5.5dB

temperature range of

−40°C to +85°C. The LMH6517

•

Gain step size of 0.5dB

is available in a 32-Pin, thermally enhanced, WQFN

•

Gain step accuracy: 0.05dB

package.

•

Frequency Range of 1200 MHz

•

Supply current 80mA per channel

Typical Application: IF Sampling Receiver

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2011, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.