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  2. Amplifiers
  3. Variable Gain Amplifiers (VGA)
  4. Digital Control VGAs
  5. AD8432


Features and Benefits

  • Low noise
    • Input voltage noise: 0.85 nV/√Hz 
    • Current noise: 2.0 pA/√Hz
  • High speed
    • 200 MHz bandwidth (G = 12.04 dB) 
    • 295 V/μs slew rate 
  • Selectable gain 
    • G = 12.04 dB (×4)
    • G = 18.06 dB (×8)
    • G = 21.58 dB (×12) 
    • G = 24.08 dB (×16) 
  • Active input impedance matching
  • Integrated input clamp diodes
  • Single-ended input, differential output 
  • Supply range: 4.5 V to 5.5 V 
  • Low power: 60 mW/channel

Product Details

The AD8432 is a dual-channel, low power, ultralow noise amplifier with selectable gain and active impedance matching. Each channel has a single-ended input, differential output, and integrated input clamps. By pin strapping the gain setting pins, four accurate gains of G = 12.04 dB, 18.06 dB, 21.58 dB, and 24.08 dB (×4, ×8, ×12, and ×16, respectively) are possible. A bandwidth of 200 MHz at G = 12.04 dB makes this amplifier well suited for many high speed applications.

The exceptional noise performance of the AD8432 is made possible by the active impedance matching. Using a feedback network, the input impedance of the amplifiers can be adjusted to match the signal source impedance without compromising the noise performance. Impedance matching and low noise in the AD8432 allow designers to create wider dynamic range systems that are able to detect even very low level signals.

The AD8432 achieves 0.85 nV/√Hz input-referred voltage noise for a gain of 12.04 dB. The AD8432’s ultralow noise, low distortion, gain accuracy, and channel-to-channel matching are ideal for high performance ultrasound systems and for processing I/Q demodulator signals.

The AD8432 operates on a single supply of 5 V at 24 mA. It is available in a 4 mm × 4 mm, 24-lead LFSCP. The LFCSP features an exposed paddle that provides a low thermal resistance path to the PCB, which enables more efficient heat transfer and increases reliability. The operating temperature range is −40°C to +85°C.


  • CW Doppler ultrasound front ends 
  • Low noise preamplification 
  • Predriver for I/Q demodulators and phase shifters 
  • Wideband analog-to-digital drivers

Product Categories

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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

Design Tool


ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
AD8432ACPZ-R7 Material Declaration Reliability Data 24-Lead LFCSP (4mm x 4mm w/ EP)
AD8432ACPZ-WP Material Declaration Reliability Data 24-Lead LFCSP (4mm x 4mm w/ EP)
Wafer Fabrication Data

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.