The LMH2832IRHAT is a fully differential, dual, 1.1GHz, digital variable gain amplifier in 40 pin VQFN package. It is a high linearity, digital variable gain amplifier (DVGA) for high speed signal chain and data acquisition systems. The LMH2832 is optimized to provide high bandwidth, low distortion and low noise thus making the device ideally suited as a dual, 14bit ADC driver. It consists of one fixed-gain block and one variable attenuator consisting of a total gain of 30dB with a maximum attenuation of 39dB. The gain range is from 30dB to -9dB in 1dB gain steps with a gain accuracy of ±0.2dB. The input impedance can be easily matched to 50 ohm or 75ohm systems using a 1:3ohm or 1:2ohm ratio balun respectively. The LMH2832 is designed to drive general-purpose ADCs and meets requirements for both data over cable service interface specification 3.0 32 quadrature amplitude modulation carriers and DOCSIS 3.1 wideband orthogonal frequency-division multiplexing systems.
Dual channel, individual SPI controlled DVGA
Single 5V power supply
Flat bandwidth response of 300MHz
Channel-to-channel gain matching is ±0.05 dB
Channel to channel phase matching of ±0.1°
Output third-order intercept point (OIP3) of 43dBm at 300MHz, 51dBm at 200MHz
Noise figure (NF) of 6.5dB (max gain) at 300MHz, ZIN = 150 ohm
Adjustable power consumption 90mA to 108mA per channel
Power-saving, power-down feature IQ < 4.5mA per channel, power-down pin and SPI programmability
Input return loss at 300MHz is 17dB (RS = 150 ohm)
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