1FEATURES

2• 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

APPLICATIONS

• Cellular Base Stations

• IF Sampling Receivers

• Instrumentation

• Modems

• Imaging

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

DESCRIPTION

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.