ald1721esa Advanced Linear Devices Inc (ALD), ald1721esa Datasheet

ald1721esa

Manufacturer Part Number

ald1721esa

Description

Epad? Micropower Operational Amplifier

Manufacturer

Advanced Linear Devices Inc (ALD)

Datasheet

1.ALD1721ESA.pdf (10 pages)

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KEY FEATURES

• EPAD ( Electrically Programmable Analog Device)

• User programmable V

• Computer-assisted trimming

• Rail-to-rail input/output

• Compatible with standard EPAD Programmer

• High precision through in-system circuit precision trimming

• Reduces or eliminates V

• System level “calibration” capability

• Application Specific Programming mode

• In-System Programming mode

• Electrically programmable to compensate for

• Achieves 0.01pA input bias current and 35 V

• Compatible with industry standard pinout

GENERAL DESCRIPTION

The ALD1721E/ALD1721 is a monolithic rail-to-rail precision CMOS

operational amplifier with integrated user programmable EPAD (Electri-

cally Programmable Analog Device) based offset voltage adjustment. The

ALD1721E/ALD1721 operational amplifier is a direct replacement of the

ALD1701 operational amplifier, with the added feature of user-program-

mable offset voltage trimming resulting in significantly enhanced total

system performance and user flexibility. EPAD technology is an exclusive

ALD design which has been refined for analog applications where preci-

sion voltage trimming is necessary to achieve a desired performance. It

utilizes CMOS FETs as in-circuit elements for trimming of offset voltage

bias characteristics with the aid of a personal computer under software

control. Once programmed, the set parameters are stored indefinitely

within the device even after power-down. EPAD offers the circuit designer

a convenient and cost-effective trimming solution for achieving the very

highest amplifier/system performance.

The ALD1721E/ALD1721 operational amplifier features rail-to-rail input

and output voltage ranges, tolerance to over-voltage input spikes of

300mV beyond supply rails, capacitive loading up to 50pF, extremely low

input currents of 0.01pA typical, high open loop voltage gain, useful

bandwidth of 700KHz, slew rate of 0.7 V/ s, and low typical supply current

of 120 uA.

ORDERING INFORMATION

* Contact factory for industrial temperature range

external component tolerances

input offset voltage simultaneously

-55 C to +125 C

8-Pin

CERDIP

Package

ALD1721E DA

ALD1721 DA

INEAR

DVANCED

EVICES,

Operating Temperature Range

NC.

EPAD™ MICROPOWER OPERATIONAL AMPLIFIER

0 C to +70 C

8-Pin

Small Outline

Package (SOIC)

ALD1721E SA

ALD1721 SA

trimmer

, PSRR, CMRR and TCV

0 C to +70 C

Plastic Dip

ALD1721E PA

ALD1721 PA

8-Pin

Package

errors

BENEFITS

• Eliminates manual and elaborate

• Remote controlled automated trimming

• In-System Programming capability

• No external components

• No internal chopper clocking noise

• No chopper dynamic power dissipation

• Simple and cost effective

• Small package size

• Extremely small total functional

• Low system implementation cost

• Micropower and Low Voltage

APPLICATIONS

• Sensor interface circuits

• Transducer biasing circuits

• Capacitive and charge integration circuits

• Biochemical probe interface

• Signal conditioning

• Portable instruments

• High source impedance electrode

• Precision Sample and Hold amplifiers

• Precision current to voltage converter

• Error correction circuits

• Sensor compensation circuits

• Precision gain amplifiers

• Periodic In-system calibration

• System output level shifter

PIN CONFIGURATION

system trimming procedures

volume size

amplifiers

VE1

+IN

-IN

V -

DA, PA, SA PACKAGE

TOP VIEW

ALD1721E/ALD1721

VE2

N/C

V +

OUT

Related parts for ald1721esa

ald1721esa Summary of contents

Page 1

A DVANCED L INEAR D I EVICES, NC. EPAD™ MICROPOWER OPERATIONAL AMPLIFIER KEY FEATURES • EPAD ( Electrically Programmable Analog Device) trimmer • User programmable V OS • Computer-assisted trimming • Rail-to-rail input/output • Compatible with standard EPAD Programmer • ...

Page 2

FUNCTIONAL DESCRIPTION The ALD1721E/ALD1721 uses EPADs as in-circuit elements for trimming of offset voltage bias characteristics. Each ALD1721E/ALD1721 has a pair of EPAD-based circuits connected such that one circuit is used to adjust V direction and the other circuit is ...

Page 3

ABSOLUTE MAXIMUM RATINGS + Supply voltage, V Differential input voltage range Power dissipation Operating temperature range Storage temperature range Lead temperature, 10 seconds OPERATING ELECTRICAL CHARACTERISTICS 2.5V unless otherwise specified A S Parameter ...

Page 4

OPERATING ELECTRICAL CHARACTERISTICS (cont' 2.5V unless otherwise specified A S Parameter Symbol Supply Current I S Power Dissipation P D Input Capacitance C IN Maximum Load Capacitance C L Equivalent Input Noise Voltage ...

Page 5

V = 2.5V - +125 C unless otherwise specified S A Parameter Symbol Initial Input offset Voltage Input Offset Current I OS Input Bias Current I B Initial Power Supply PSRR i 8 Rejection Ratio ...

Page 6

TYPICAL PERFORMANCE CHARACTERISTICS OUTPUT VOLTAGE SWING AS A FUNCTION OF SUPPLY VOLTAGE +125 100K SUPPLY VOLTAGE (V) INPUT BIAS CURRENT AS ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS COMMON MODE INPUT VOLTAGE RANGE AS A FUNCTION OF SUPPLY VOLTAGE SUPPLY VOLTAGE (V) OPEN LOOP VOLTAGE GAIN AS A ...

Page 8

TWO EXAMPLES OF EQUIVALENT INPUT OFFSET VOLTAGE DUE TO 500 400 300 200 100 THREE EXAMPLES OF EQUIVALENT INPUT OFFSET VOLTAGE DUE TO CHANGE IN COMMON MODE VOLTAGE vs. COMMON MODE VOLTAGE 500 400 300 EXAMPLE B: ...

Page 9

APPLICATION SPECIFIC / IN-SYSTEM PROGRAMMING Examples of applications where accumulated total input offset voltage from various contributing sources is minimized under different sets of user-specified operating conditions 2500 2000 1500 V BUDGET AFTER OS 1000 EPAD PROGRAMMING 500 0 -500 ...

Page 10

DEFINITIONS AND DESIGN NOTES: 1. Initial Input Offset Voltage is the initial offset voltage of the ALD1721E/ALD1721 operational amplifier when shipped from the factory. The device has been pre-programmed and tested for programmability. 2. Offset Voltage Program Range is the ...

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