Datasheet > AD549SH/883B

AD549SH/883B

更新时间： 2024-02-22 18:43:48

品牌	Logo	应用领域
亚德诺 - ADI		运算放大器
页数	文件大小	规格书
20页	1228K
描述
Ultralow Input Bias Current Operational Amplifier

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AD549SH/883B 数据手册

Ultralow Input Bias Current

Operational Amplifier

AD549

FEATURES

CONNECTION DIAGRAM

GUARD PIN,

CONNECTED

TO CASE

Ultralow input bias current

60 fA maximum (AD549L)

250 fA maximum (AD549J)

Input bias current guaranteed over the common-mode

voltage range

OFFSET NULL

V+

AD549

INVERTING

INPUT

OUTPUT

Low offset voltage

0.25 mV maximum (AD549K)

1.00 mV maximum (AD549J)

Low offset drift

5 μV/°C maximum (AD549K)

20 μV/°C maximum (AD549J)

Low power

NONINVERTING

INPUT

OFFSET

NULL

V–

10kΩ

–15V

TRIM

700 μA maximum supply current

Low input voltage noise

4 μV p-p over 0.1 Hz to 10 Hz

MIL-STD-883B parts available

Figure 1.

APPLICATIONS

Electrometer amplifier

Photodiode preamp

pH electrode buffer

Vacuum ion gauge measurement

connected to a point at the same potential as the input terminals,

minimizing stray leakage to the case. 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.

GENERAL DESCRIPTION

The AD549¹is a monolithic electrometer operational amplifier

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

offset voltage drift are laser trimmed for precision performance.

The ultralow input current of the part 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 10¹⁵Ω common-mode impedance,

which results from the bootstrapped input stage, ensures that

the input current is essentially independent of the common-

mode voltage.

PRODUCT HIGHLIGHTS

1. 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 is suited for applications requiring very low input

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

wide variety of current output transducers, such as photodiodes,

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.

2. The AD549 input offset voltage and drift are laser trimmed

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

20 μV/°C (AD549J).

3. A maximum quiescent supply current of 700 μA minimizes

heating effects on input current and offset voltage.

4. 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%.

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

is connected to Pin 8, thus, the metal case can be independently

¹Protected by U.S. Patent No. 4,639,683.

Rev. H

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 registeredtrademarks arethe 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

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AD549SH/883B 替代型号

型号	品牌	替代类型	描述	数据表
AD549LHZ	ADI	类似代替	Ultralow Input Bias Current Operational Amplifier
AD549KHZ	ADI	类似代替	Ultralow Input Bias Current Operational Amplifier
AD549JHZ	ADI	类似代替	Ultralow Input Bias Current Operational Amplifier

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