ADA4530-1ARZ-R7 datasheet(1/51 Pages) AD

部件名	ADA4530-1ARZ-R7

功能描述	Femtoampere Input Bias Current Electrometer Amplifier

PDF	51 Pages

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制造商	AD [Analog Devices]

网页	http://www.analog.com

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Femtoampere Input Bias Current

Electrometer Amplifier

Data Sheet

ADA4530-1

Rev. A

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FEATURES

Low input bias current

±20 fA maximum at TA = 25°C (guaranteed at production test)

± 20 fA maximum at −40°C < TA < +85°C

± 250 fA maximum at −40°C < TA < +125°C (guaranteed at

production test)

Low offset voltage: 50 μV maximum over specified CMRR range

Offset drift: 0.13 μV/°C typical, 0.5 μV/°C maximum

Integrated guard buffer with 100 μV maximum offset

Low voltage noise density: 14 nV/√Hz at 10 kHz

Wide bandwidth: 2 MHz unity-gain crossover

Supply voltage: 4.5 V to 16 V (±2.25 V to ±8 V)

Operating temperature: −40°C to +125°C

APPLICATIONS

Laboratory and analytical instrumentation:

spectrophotometers, chromatographs, mass

spectrometers, and potentiostatic and amperostatic

coulometry

Instrumentation: picoammeters and coulombmeters

Transimpedance amplifier (TIA) for photodiodes, ion

chambers, and working electrode measurements

High impedance buffering for chemical sensors and

capacitive sensors

PIN CONNECTION DIAGRAM

+IN 1

GRD 2

IC 3

V– 4

–IN

8

GRD

7

OUT

6

V+

5

ADA4530-1

NOTES

1. IC = INTERNAL CONNECTION. THIS

PIN MUST BE CONNECTED TO V–

OR LEFT UNCONNECTED.

Figure 1.

GENERAL DESCRIPTION

The ADA4530-1 is a femtoampere (10−15 A) level input bias

current operational amplifier suitable for use as an electrometer

that also includes an integrated guard buffer. It has an operating

voltage range of 4.5 V to 16 V enabling it to operate in conven-

tional 5 V and 10 V single supply systems as well as ±2.5 V and

±5 V dual supply systems.

It provides ultralow input bias currents that are production

tested at temperature to ensure the device meets its perfor-

mance goals in user systems. The integrated guard buffer is

provided to isolate the input pins from leakage in the printed

circuit board (PCB), minimize board component count, and

enable ease of system design. The ADA4530-1 is available in an

industry-standard surface-mount 8-lead SOIC package with a

unique pinout optimized to prevent signals from coupling

between the sensitive input pins, the power supplies, and the

output pin while enabling easy routing of the guard ring traces.

The ADA4530-1 also offers low offset voltage, low offset drift,

and low voltage and current noise needed for the types of

applications that require such low leakages. To maximize the

dynamic range of the system, the ADA4530-1 has a rail-to-rail

output stage that can typically drive to within 30 mV of the

supply rails under a 10 kΩ load.

The ADA4530-1 operates over the −40°C to +125°C industrial

temperature range and is available in an 8-lead SOIC package.

1000

0.001

0.01

0.1

1

10

100

010

30

20

40

50

60

70

80

90 100 110 120 130

TEMPERATURE (°C)

VSY = 10V

VCM = VSY/2

RH < 10%

–40°C TO +85°C LIMIT

–40°C TO +125°C LIMIT

IB+

IB–

Figure 2. Input Bias Current (IB) vs. Temperature, VSY = 10 V

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