ad8432acpz Analog Devices, Inc., ad8432acpz Datasheet

ad8432acpz

Manufacturer Part Number

ad8432acpz

Description

Dual Lna With Selectable Gain And Input Impedance

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD8432ACPZ.pdf (12 pages)

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Preliminary Technical Data

FEATURES

Low noise

Excellent ac specifications

Selectable Gain: ×4, ×8, ×12, ×16

Active input impedance matching

Single-ended input, differential output

Supply range: 4.5 V to 5.5 V

Low power: 60 mW/channel

APPLICATIONS

Ultrasound front ends

Wideband A/D drivers

Low Noise Preamplification

Predriver for I/Q demodulators and phase shifters

GENERAL DESCRIPTION

The AD8432 is a dual-channel, low power, ultralow noise

amplifier with selectable gain and active impedance matching.

Each amplifier has a single-ended input, differential output, and

optional integrated input clamps. By pin strapping the gain

setting pins, four accurate gains of G = ×4, ×8, ×12, and ×16 are

possible. A bandwidth of 200 MHz at G = ×4 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.

Rev. PrA

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.

Input voltage noise: 0.85 nV/√Hz

Current noise: 2.0 pA/√Hz

200 MHz bandwidth @ G = 4

271 V/μs slew rate

Selectable Gain and Input Impedance

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

The AD8432 achieves 0.85 nV/√Hz input referred voltage noise

for a gain of ×4. The ultralow noise and low distortion of the

AD8432, excellent gain accuracy, and active impedance

matching is ideal for high performance ultrasound systems.

Dual-channel and gain matching make it ideal 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.

INH1

IND1

INH2

IND2

INL1

INL2

FUNCTIONAL BLOCK DIAGRAM

ENB

VPS1

Figure 1.

BIAS

LNA1

LNA2

VPS2

Dual LNA with

AD8432

COMM

AD8432

www.analog.com

OPH1

OPL1

GMH1

GOH1

GOL1

GML1

OPH2

OPL2

GMH2

GOH2

GOL2

GML2

Related parts for ad8432acpz

ad8432acpz Summary of contents

Page 1

... One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 Dual LNA with AD8432 VPS1 VPS2 COMM BIAS AD8432 OPH1 LNA1 OPL1 GMH1 GOH1 GOL1 GML1 OPH2 LNA2 OPL2 GMH2 GOH2 GOL2 GML2 Figure 1. www.analog.com ©2009 Analog Devices, Inc. All rights reserved. ...

Page 2

AD8432 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 5 ESD Caution .................................................................................. 5 Pin Configuration and Function Descriptions ...

Page 3

Preliminary Technical Data SPECIFICATIONS 25° Ω ended input to differential output MHz, unless otherwise specified. Table 1. Parameter DYNAMIC PERFORMANCE ...

Page 4

AD8432 Parameter Two-Tone IMD3 Distortion 10 MHz 1 MHz Input 1dB Compression Point Input 1dB Compression Point Output-Third Order Intercept Crosstalk DC PERFORMANCE Input Offset Voltage Input Offset Voltage Drift INPUT CHARACTERISTICS Input Voltage Range Input Resistance Input Capacitance Input ...

Page 5

Preliminary Technical Data ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Voltage Supply Voltage Input Voltage Power Dissipation Temperature Operating Temperature Storage Temperature Lead Temperature (Soldering, 60 sec) 1 Thermal Resistance 24-Lead LFCSP θ JA θ JC θ JB Ψ ...

Page 6

AD8432 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions Pin No. Mnemonic Description 1 INH1 Noninverting Input of LNA1 2 INL1 Inverting Input of LNA1 (AC-Coupled to Ground IND1, IND2 Integrated Input Clamping Back-to-Back Diodes 4 ...

Page 7

Preliminary Technical Data TYPICAL PERFORMANCE CHARACTERISTICS Figure 3. Figure 4. Figure 5. Rev. PrA | Page AD8432 Figure 6. Figure 7. Figure 8. ...

Page 8

AD8432 THEORY OF OPERATION LOW NOISE AMPLIFIER (LNA) A simplified schematic of an LNA is shown in Figure 9. The LNA is driven with a single-ended input and measured differentially at the output. The inverting input INL must be ac- ...

Page 9

Preliminary Technical Data The single-ended gain from INHx to OPLx is defined − − OPL INH Again, different gain configurations can be realized ...

Page 10

AD8432 Table 5. Feedback Resistance for Several R Desired R (Ω) Single-Ended Gain, G/2 (V/ 100 2 200 100 100 100 8 and ...

Page 11

Preliminary Technical Data APPLICATIONS INFORMATION The unterminated input impedance of LNA is 6.2 kΩ. Any input resistance between 50 Ω and 6.2 kΩ can be synthesized. When active input termination is used, a decoupling capacitor ( required to ...

Page 12

... AD8432ACPZ 1 −40°C to +85°C 1 AD8432ACPZ-R7 -40°C to +85°C 1 AD8432ACPZ-RL -40°C to +85°C 1 AD8432ACPZ-WP -40°C to +85°C 1 AD8432-EVALZ RoHS Compliant Part. ©2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. PR08341-0-6/09(PrA) 4.10 ...

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