AD549SH Analog Devices, AD549SH Datasheet

AD549SH

Manufacturer Part Number

AD549SH

Description

18V; 500mW; ultra low input bias current operational amplifier. For electrometer amplifiers, photodiode preamp, pH electrode buffer, vacuum Ion gage measurement

Manufacturer

Analog Devices

Datasheet

1.AD549SH.pdf (20 pages)

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FEATURES

Ultralow input-bias current

Input-bias current guaranteed over common-mode

Low offset voltage

Low offset drift

Low power

4 μV p-p 0.1 Hz to 10 Hz

MIL-STD-883B parts available

GENERAL DESCRIPTION

The AD549

with very low input bias current. Input offset voltage and input

offset voltage drift are laser trimmed for precision performance.

The part’s ultralow input current is achieved with “Topgate” JFET

technology, a process development exclusive to Analog Devices,

Inc. This technology allows fabrication of extremely low input

current JFETs compatible with a standard junction isolated

bipolar process. The 10

results from the bootstrapped input stage, ensures that the input

current is essentially independent of common-mode voltage.

The AD549 is suited for applications that require very low input

current and low input offset voltage. It excels as a preamp for a

wide variety of current output transducers, such as photo-

diodes, photomultiplier tubes, or oxygen sensors. The AD549

can also be used as a precision integrator or low droop sample

and hold. The AD549 is pin compatible with standard FET and

electrometer op amps, allowing designers to upgrade the

performance of present systems at little additional cost.

The AD549 is available in a TO-99 hermetic package. The case

is connected to Pin 8 so that the metal case can be independ-

ently connected to a point at the same potential as the input

terminals, minimizing stray leakage to the case.

Rev. G

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.

Protected by U.S. Patent No. 4,639,683.

60 fA maximum (AD549L)

250 fA maximum (AD549J)

voltage range

0.25 mV maximum (AD549K)

1.00 mV maximum (AD549J)

5 μV/°C maximum (AD549K)

20 μV/°C maximum (AD549J)

700 μA maximum supply current

Low input voltage noise

is a monolithic electrometer operational amplifier

Ω common-mode impedance, which

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

Tel: 781.329.4700

Fax: 781.461.3113

APPLICATIONS

Electrometer amplifier

Photodiode preamp

pH electrode buffer

Vacuum ion gauge measurement

The AD549 is available in four performance grades. The J, K,

and L versions are rated over the commercial temperature range

of 0°C to +70°C. The S grade is specified over the military

temperature range of −55°C to +125°C and is available

processed to MIL-STD-883B, Rev. C. Extended reliability plus

screening is also available. Plus screening includes 168 hour

burn-in, as well as other environmental and physical tests

derived from MIL-STD-883B, Rev. C.

PRODUCT HIGHLIGHTS

Ultralow Input-Bias Current

The AD549 input currents are specified, 100% tested, and

guaranteed after the device is warmed up. They are guaran-

teed over the entire common-mode input voltage range.

The AD549 input offset voltage and drift are laser trim-

med to 0.25 mV and 5 μV/°C (AD549K), and to 1 mV and

20 μV/°C (AD549J).

A maximum quiescent supply current of 700 μA minimizes

heating effects on input current and offset voltage.

AC specifications include 1 MHz unity gain bandwidth

and 3 V/μs slew rate. Settling time for a 10 V input step is

5 μs to 0.01%.

NONINVERTING

INVERTING

OFFSET NULL

CONNECTION DIAGRAM

NC = NO CONNECTION

Operational Amplifier

INPUT

GUARD PIN, CONNECTED TO CASE

INPUT

Figure 1.

AD549

10kΩ

V–

TRIM

V+

OFFSET

NULL

–15V

OUTPUT

www.analog.com

AD549

Related parts for AD549SH

AD549SH Summary of contents

Page 1

... Rev. G 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. ...

Page 2

AD549 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Connection Diagram ....................................................................... 1 General Description ......................................................................... 1 Product Highlights ........................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 Typical Performance Characteristics ............................................. 6 Functional Description .................................................................. 10 ...

Page 3

SPECIFICATIONS @ 25°C and V = ±15 V dc, unless otherwise noted. All minimum and maximum specifications are guaranteed. Specifications in boldface S are tested on all production units at final electrical test. Results from those tests are used to ...

Page 4

... AD549LH AD549SH/883B Max Unit + MHz kHz V/μs μs μs μs V ±18 V 0.70 mA +125 °C +150 °C ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Internal Power Dissipation 1 Input Voltage Output Short-Circuit Duration Differential Input Voltage Storage Temperature Range (H) Operating Temperature Range AD549J, AD549K, AD549L AD549S Lead Temperature (Soldering, 60 sec) 1 For supply voltages ...

Page 6

AD549 TYPICAL PERFORMANCE CHARACTERISTICS SUPPLY VOLTAGE (V) Figure 2. Input Voltage Range vs. Supply Voltage 20 25° 10kΩ SUPPLY VOLTAGE ...

Page 7

TEMPERATURE (°C) Figure 8. Open-Loop Gain vs. Temperature WARM-UP TIME (Minutes) Figure 9. Change in Offset Voltage vs. ...

Page 8

AD549 100 –20 –40 10 100 1k 10k 100k FREQUENCY (Hz) Figure 14. Open-Loop Frequency Response 100 1k 10k FREQUENCY (Hz) Figure 15. Large Signal ...

Page 9

S 0.1µ AD549 10kΩ 100pF 3 IN 0.1µF SQUARE WAVE –V S INPUT Figure 19. Unity Gain Follower Figure 20. Unity Gain Follower Large Signal Pulse Response Figure 21. Unity ...

Page 10

AD549 FUNCTIONAL DESCRIPTION MINIMIZING INPUT CURRENT The AD549 has been optimized for low input current and offset voltage. Careful attention to how the amplifier is used reduces input currents in actual applications. The amplifier operating temperature should be kept as ...

Page 11

AD549 is connected to Pin 8 so that it can be bootstrapped near the input potential. This minimizes pin leakage and input common-mode capacitance due to the case. Guard schemes for inverting and noninverting amplifier topologies are illustrated in ...

Page 12

AD549 AC RESPONSE WITH HIGH VALUE SOURCE AND FEEDBACK RESISTANCE Source and feedback resistances greater than 100 kΩ magnify the effect of the input capacitances (stray and inherent to the AD549) on the ac behavior of the circuit. The effects ...

Page 13

DIFFERENTIAL INPUT VOLTAGE OVERLOAD A plot of the AD549 input currents vs. differential input voltage (defined − V −) appears in Figure 36. The IN IN input current at either terminal stays below a few hundred femtoamps ...

Page 14

AD549 The test apparatus is calibrated without a device under test present. After power is turned on minute stabilization period is required. First, V and V ERR1 ERR2 voltages are the errors caused by the offset voltages and ...

Page 15

Input current contributes an output voltage error proportional to the feedback resistance × The op amp’s input voltage offset causes an error current through the photodiode’s shunt ...

Page 16

AD549 Frequency compensation is provided by R11, R12, C1, and C2. The bandwidth of the circuit is 300 kHz at input signals greater than 50 μA; bandwidth decreases smoothly with decreasing signal levels. To trim the circuit, set the input ...

Page 17

The pH probe output is ideally independent of temperature. The slope of the probe’s transfer function, though predictable, is temperature dependent (−54.2 mV/ and −74.04 mV/pH at 100°C). By using an ...

Page 18

... AD549JHZ 0°C to +70°C AD549KH 0°C to +70°C 1 AD549KHZ 0°C to +70°C AD549LH 0°C to +70°C 1 AD549LHZ 0°C to +70°C AD549SH/883B −55°C to +125° RoHS Compliant Part. REFERENCE PLANE 0.5000 (12.70) MIN 0.1000 (2.54) 0.2500 (6.35) MIN BSC 0.1600 (4.06) 0.0500 (1.27) MAX 0.1400 (3.56) ...

Page 19

NOTES Rev Page AD549 ...

Page 20

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