LMH2832 Fully-Differential, Dual, 1.1 GHz Digital Variable Gain Amplifier | TI.com

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Fully-Differential, Dual, 1.1 GHz Digital Variable Gain Amplifier



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.


  • Dual-Channel, Individual SPI™-Controlled DVGA
  • Single 5-V Supply
  • –3-dB Bandwidth: 1.1 GHz (Max Gain)
  • Flat Bandwidth Response: 300 MHz
  • Channel-to-Channel Gain Matching: ±0.05 dB
  • Channel-to-Channel Phase Matching: ±0.1°
  • Gain:
    • 30 dB to –9 dB
    • 1-dB Steps ±0.2 dB
  • Output Third-Order Intercept Point (OIP3):
    • 43 dBm at 300 MHz
    • 51 dBm at 200 MHz
  • Noise Figure (NF):
    • 6.5 dB (Max Gain) at 300 MHz, ZIN = 150 Ω
  • Adjustable Power Consumption:
    • 90 mA to 108 mA per Channel
  • Power-Saving, Power-Down Feature:
    • IQ < 4.5 mA per Channel
    • Power-Down Pin and SPI Programmability
  • Input Return Loss at 300 MHz:
    • 17 dB (RS = 150 Ω)


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Part number Order 2nd harmonic (dBc) 3rd harmonic (dBc) @ MHz Acl, min spec gain (V/V) Approx. price (US$) Architecture BW @ Acl (MHz) Gain (Max) (dB) Iq per channel (Typ) (mA) Number of channels (#) Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Total supply voltage (Max) (+5V=5, +/-5V=10) Total supply voltage (Min) (+5V=5, +/-5V=10) Vs (Min) (V) Vs (Max) (V)
LMH2832 Order now 82     94     100     0.35     7.88 | 1ku     VGA
Fully Differential ADC Driver    
1100     30     105     2     -40 to 85     VQFN | 40     40VQFN: 36 mm2: 6 x 6 (VQFN | 40)     5.25     4.75     4.75     5.25