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.