1FEATURES

2• OIP3: 49dBm at 200MHz

• Noise Figure: 8.5dB

• Voltage Gain: 26dB

• 1dB Gain Steps

• Enable Pins Active in SPI Mode

• −3dB Bandwidth of 1400 MHz

• Gain Step Accuracy: 0.2 dB

• Disable Function for Each Channel

• Parallel and Serial Gain Control

• Low Power Mode for Power Management

Flexibility

• Small Footprint WQFN Package

APPLICATIONS

• Cellular Base Stations

• Wideband and Narrowband IF Sampling

Receivers

• Wideband Direct Conversion

• ADC Driver

DESCRIPTION

The LMH6523 contains four, high performance,

digitally controlled variable gain amplifiers (DVGA). It

has been designed for use in narrowband and

broadband IF sampling applications. Typically, the

LMH6523 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 LMH6523 has an independent,

digitally controlled attenuator and a high linearity,

differential output, amplifier. All circuitry has been

optimized for low distortion and maximum system

design flexibility. Power consumption is managed by

a three-state enable pin. Individual channels can be disabled or placed into a Low Power Mode or a

higher performance, High Power Mode. The enable

pin is active in both serial and parallel modes for

systems that require high speed power control.

The LMH6523 digitally controlled attenuator provides

precise 1dB gain steps over a 31dB range. The digital attenuator can be controlled by either a SPI™ Serial

bus or a high speed parallel bus.

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 a wide range filter designs or analog to digital

converters. For applications which have very large

changes in signal level LMH6523 can support up to

62dB of gain range by cascading channels.

The LMH6523 operates over the industrial temperature range of −40°C to 85°C. The LMH6523

is available in a 54-Pin, thermally enhanced, WQFN

package.