AD743KN AD [Analog Devices], AD743KN Datasheet

AD743KN

Manufacturer Part Number

AD743KN

Description

Ultralow Noise BiFET Op Amp

Manufacturer

AD [Analog Devices]

Datasheet

1.AD743KN.pdf (12 pages)

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

AD743KNZ

Manufacturer:

MOT

Quantity:

454

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PRODUCT DESCRIPTION

The AD743 is an ultralow noise precision, FET input,

monolithic operational amplifier. It offers a combination of the

ultralow voltage noise generally associated with bipolar input op

amps and the very low input current of a FET-input device.

Furthermore, the AD743 does not exhibit an output phase

reversal when the negative common-mode voltage limit is

exceeded.

The AD743’s guaranteed, maximum input voltage noise of

4.0 nV/ Hz at 10 kHz is unsurpassed for a FET-input

monolithic op amp, as is the maximum 1.0 V p-p, 0.1 Hz to

10 Hz noise. The AD743 also has excellent dc performance with

250 pA maximum input bias current and 0.5 mV maximum

offset voltage.

The AD743 is specifically designed for use as a preamp in

capacitive sensors, such as ceramic hydrophones. It is available

in five performance grades. The AD743J and AD743K are rated

over the commercial temperature range of 0 C to +70 C. The

AD743A and AD743B are rated over the industrial temperature

range of –40 C to +85 C. The AD743S is rated over the

military temperature range of –55 C to +125 C and is available

processed to MIL-STD-883B, Rev. C.

The AD743 is available in 8-pin plastic mini-DIP, 8-pin cerdip,

16-pin SOIC, or in chip form.

REV. C

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

FEATURES

ULTRALOW NOISE PERFORMANCE

2.9 nV/ Hz at 10 kHz

0.38 V p-p, 0.1 Hz to 10 Hz

6.9 fA/ Hz Current Noise at 1 kHz

EXCELLENT DC PERFORMANCE

0.5 mV max Offset Voltage

250 pA max Input Bias Current

1000 V/mV min Open-Loop Gain

AC PERFORMANCE

2.8 V/ s Slew Rate

4.5 MHz Unity-Gain Bandwidth

THD = 0.0003% @ 1 kHz

Available in Tape and Reel in Accordance with

APPLICATIONS

Sonar Preamplifiers

High Dynamic Range Filters (>140 dB)

Photodiode and IR Detector Amplifiers

Accelerometers

EIA-481A Standard

PRODUCT HIGHLIGHTS

1. The low offset voltage and low input offset voltage drift of

2. The combination of low voltage and low current noise make

3. The low input offset voltage and low noise level of the

4. The typical 10 kHz noise level of 2.9 nV/ Hz permits a three

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

Tel: 617/329-4700

NULL

8-Pin Plastic Mini-DIP (N)

8-Pin Cerdip (Q) Packages

–V

the AD743 coupled with its ultralow noise performance

mean that the AD743 can be used for upgrading many

applications now using bipolar amplifiers.

the AD743 ideal for charge sensitive applications such as

accelerometers and hydrophones.

AD743 provide >140 dB dynamic range.

op amp instrumentation amplifier, using three AD743s, to be

built which exhibits less than 4.2 nV/ Hz noise at 10 kHz

and which has low input bias currents.

–IN

+IN

NC = NO CONNECT

Input Noise Voltage vs. Source Resistance

1000

TOP VIEW

100

AD743

and

100

CONNECTION DIAGRAMS

AD743 & RESISTOR

OP27 & RESISTOR

SOURCE

RESISTOR NOISE ONLY

SOURCE

SOURCE RESISTANCE –

OUT

NULL

10k

(– – –)

OFFSET

NULL

–V

16-Pin SOIC (R) Package

–IN

+IN

Ultralow Noise

100k

BiFET Op Amp

OP27 &

RESISTOR

( — )

NC = NO CONNECT

AD743 + RESISTOR

AD743

(

AD743

)

Fax: 617/326-8703

10M

16 NC

OUTPUT

OFFSET

NULL

Related parts for AD743KN

AD743KN Summary of contents

Page 1

FEATURES ULTRALOW NOISE PERFORMANCE 2.9 nV kHz 0.38 V p-p, 0 6.9 fA/ Hz Current Noise at 1 kHz EXCELLENT DC PERFORMANCE 0.5 mV max Offset Voltage 250 pA max Input Bias ...

Page 2

AD743–SPECIFICATIONS Model Conditions 1 INPUT OFFSET VOLTAGE Initial Offset Initial Offset MIN MAX vs. Temp MIN MAX vs. Supply (PSRR vs. Supply (PSRR MIN MAX 3 ...

... IMCS 5000 automated ESD tester. Pins other than null pins fail at greater than 2500 V. REV Model V S AD743JN and – AD743KN AD743JR-16 AD743KR-16 AD743BQ AD743SQ/883B AD743JR-16-REEL AD743KR-16-REEL *N = Plastic DIP Small Outline IC Cerdip C/Watt C/Watt ...

Page 4

AD743 –Typical Characteristics 10k LOAD – SUPPLY VOLTAGE VOLTS Figure 1. Input Voltage Swing vs. Supply Voltage ...

Page 5

PHASE 60 GAIN –20 1M 10M 100M 100 1k 10k 100k FREQUENCY – Hz Figure 10. Open-Loop Gain and Phase vs. Frequency 120 100 V = 10V 100 1k ...

Page 6

AD743 –Typical Characteristics 2.5 2.7 2.9 3.1 INPUT VOLTAGE NOISE – Figure 19. Typical Noise Distribution @ 10 kHz (602 Units) Figure 20. Offset Null Configuration ...

Page 7

OP AMP PERFORMANCE: JFET VS. BIPOLAR The AD743 is the first monolithic JFET op amp to offer the low input voltage noise of an industry-standard bipolar op amp without its inherent input current errors. This is demonstrated in Figure 24, ...

Page 8

AD743 Figures 26 and 27 show two ways to buffer and amplify the output of a charge output transducer. Both require using an amplifier which has a very high input impedance, such as the AD743. Figure 26 shows a model ...

Page 9

HOW CHIP PACKAGE TYPE AND POWER DISSIPATION AFFECT INPUT BIAS CURRENT As with all JFET input amplifiers, the input bias current of the AD743 is a direct function of device junction temperature, I approximately doubling every 10°C. Figure 30 shows ...

Page 10

AD743 AN INPUT-IMPEDANCE-COMPENSATED, SALLEN-KEY FILTER The simple high pass filter of Figure 35 has an important source of error which is often overlooked. Even input capacitance in amplifier “A” will contribute an additional 1% of passband amplitude ...

Page 11

Figure 37b. An AC-Coupled, Low Noise Hydrophone Amplifier Figure 37c. A Hydrophone Amplifier Incorporating a DC Servo Loop Figure 39. Optional External Components for Balancing Source Impedances REV. C Where the dc gain is 1 and the gain above the ...

Page 12

AD743 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Pin Plastic Mini-DIP (N) 8-Pin Cerdip (Q) Packages 16-Pin SOIC (R) Package –12– REV. C ...

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