Maker : Analog Devices
Part No. : AD8432

Datasheet PDF : AD8432.pdf
Cross Reference : AD8432 Cross Reference
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Product Information

Dual-Channel Ultralow Noise Amplifier with Selectable Gain and Input Impedance AD8432 FEATURES Low noise Input voltage noise: 0.85 nV/√Hz Current noise: 2.0 pA/√Hz Excellent ac specifications 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 ENB VPS1 VPS2 COMM BIAS AD8432 INH1 IND1 LNA1 OPL1 GMH1 GOH1 GOL1 GML1 OPH2 IND2 LNA2 OPL2 GMH2 GOH2 GOL2 GML2 OPH1 INL1 INH2 Figure 1. APPLICATIONS CW Doppler ultrasound front ends Low noise preamplification Predriver for I/Q demodulators and phase shifters Wideband analog-to-digital drivers GENERAL DESCRIPTION The AD8432 is a dual-channel, low power, ultralow noise amplifier with selectable gain and active impedance matching. www.DataSheet4U.com Each amplifier 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) 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 of 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, excellent 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. Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2009 Analog Devices, Inc. All rights reserved. 08341-001 INL2 AD8432 TABLE OF CONTENTS Features .............................................................................................. 1  Applications ....................................................................................... 1  Functional Block Diagram .............................................................. 1  General Description ......................................................................... 1  Revision History ............................................................................... 2  Specifications..................................................................................... 3  Absolute Maximum Ratings............................................................ 5  Thermal Resistance ...................................................................... 5  Maximum Power Dissipation ..................................................... 5  ESD Caution .............................................................

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