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AD8432:  Dual-Channel Ultralow Noise Amplifier with Selectable Gain and Input Impedance

Product Details

Product Status:Recommended for New Designs

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.

Applications

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

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

Functional Block Diagram for AD8432

Evaluation Kits & Symbols & Footprints

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Price, packaging, availability

AD8432 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8432ACPZ-R7 Status: Production 24 ld LFCSP (4x4mm 2.5mm PAD) 24 Ind Reel, 1500 $1.60 $1.29 Y  Material Info PCN Purchase Sample
AD8432ACPZ-RL Status: Production 24 ld LFCSP (4x4mm 2.5mm PAD) 24 Ind Reel, 5000 $1.60 $1.29 Y  Material Info PCN Purchase
AD8432ACPZ-WP Status: Production 24 ld LFCSP (4x4mm 2.5mm PAD) 24 Ind Tray, 64 $1.60 $1.29 Y  Material Info Notify Me Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

AD8432 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8432-EVALZ Status: Production Evaluation Board $125.00 Yes -

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.

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