The LMH2832 is a high-linearity, dual-channel, 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, 14-bit,
analog-to-digital converter (ADC) driver. The device consists of one fixed-gain block and one
variable attenuator consisting of a total gain of 30 dB with a maximum attenuation of 39 dB. The
gain range is from 30 dB to –9 dB in 1-dB gain steps with a gain accuracy of ±0.2 dB. The input
impedance can be easily matched to 50-Ω or 75-Ω systems using a 1:3-Ω or 1:2-Ω ratio balun,
respectively. The LMH2832 is designed to drive general-purpose ADCs and also meets the requirements
for both data over cable service interface specification (DOCSIS) 3.0 32 quadrature amplitude
modulation (QAM) carriers and DOCSIS 3.1 wideband orthogonal frequency-division multiplexing (OFDM)
systems. With excellent NF (6.5 dB) and linearity, the LMH2832 is designed to perform
to within DOCSIS specifications. The quiescent current in the power-down state is less than 5 mA
per channel with the typical current consumption during operation at 105 mA per channel.
The LMH2832 is a high-linearity, dual-channel, 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, 14-bit,
analog-to-digital converter (ADC) driver. The device consists of one fixed-gain block and one
variable attenuator consisting of a total gain of 30 dB with a maximum attenuation of 39 dB. The
gain range is from 30 dB to –9 dB in 1-dB gain steps with a gain accuracy of ±0.2 dB. The input
impedance can be easily matched to 50-Ω or 75-Ω systems using a 1:3-Ω or 1:2-Ω ratio balun,
respectively. The LMH2832 is designed to drive general-purpose ADCs and also meets the requirements
for both data over cable service interface specification (DOCSIS) 3.0 32 quadrature amplitude
modulation (QAM) carriers and DOCSIS 3.1 wideband orthogonal frequency-division multiplexing (OFDM)
systems. With excellent NF (6.5 dB) and linearity, the LMH2832 is designed to perform
to within DOCSIS specifications. The quiescent current in the power-down state is less than 5 mA
per channel with the typical current consumption during operation at 105 mA per channel.