ALD1721EDA ALD [Advanced Linear Devices], ALD1721EDA Datasheet

ALD1721EDA

Manufacturer Part Number

ALD1721EDA

Description

Manufacturer

ALD [Advanced Linear Devices]

Datasheet

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GENERAL DESCRIPTION

The ALD1721E is a monolithic rail-to-rail precision CMOS operational

amplifier with integrated user programmable EPAD (Electrically Program-

mable Analog Device) based offset voltage adjustment. The ALD1721E

operational amplifier is a direct replacement of the ALD1701 operational

amplifier, with the added feature of user-programmable 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 precision 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 perfor-

mance.

The ALD1721E 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 0.7V/ s, and low typical supply current of 120 A.

* Contact factory for leaded (non-RoHS) or high temperature versions.

ORDERING INFORMATION

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 external

• Achieves 0.01pA input bias current and 35 V input offset

• Compatible with industry standard pinout

component tolerances

voltage simultaneously

0 C to +70 C

8-Pin

Small Outline

Package (SOIC)

ALD1721ESAL

INEAR

DVANCED

EVICES,

Operating Temperature Range

EPAD ® MICROPOWER CMOS OPERATIONAL AMPLIFIER

NC.

0 C to +70 C

8-Pin

Plastic Dip

Package

ALD1721EPAL

(“L” suffix denotes lead-free (RoHS))

trimmer

, PSRR, CMRR and TCV

-55 C to +125 C

8-Pin

CERDIP

Package

ALD1721EDA

www.aldinc.com

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

VE1

+IN

system trimming procedures

volume size

amplifiers

-IN

V -

* N/C Pin is internally connected. Do not connect externally.

SAL, PAL, DA PACKAGES

TOP VIEW

ALD1721E

VE2

EPAD

V +

OUT

N/C

Related parts for ALD1721EDA

ALD1721EDA Summary of contents

Page 1

... Sensor compensation circuits • Precision gain amplifiers • Periodic In-system calibration • System output level shifter PIN CONFIGURATION VE1 -IN +IN - +125 8-Pin CERDIP Package ALD1721EDA * N/C Pin is internally connected. Do not connect externally. www.aldinc.com EPAD ALD1721E 1 8 VE2 ...

Page 2

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

Page 3

ABSOLUTE MAXIMUM RATINGS + Supply voltage, V Differential input voltage range Power dissipation Operating temperature range SAL, PAL packages DA package Storage temperature range Lead temperature, 10 seconds CAUTION: ESD Sensitive Device. Use static control procedures in ESD controlled environment. ...

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

OPERATING ELECTRICAL CHARACTERISTICS (cont' 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 ...

Page 6

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

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF SUPPLY VOLTAGE AND TEMPERATURE 1000 100 10 - SUPPLY VOLTAGE (V) INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE 1000 V = ...

Page 8

TYPICAL PERFORMANCE CHARACTERISTICS COMMON MODE INPUT VOLTAGE RANGE AS A FUNCTION OF SUPPLY VOLTAGE SUPPLY VOLTAGE (V) LARGE - SIGNAL TRANSIENT RESPONSE ...

Page 9

TYPICAL PERFORMANCE CHARACTERISTICS TWO EXAMPLES OF EQUIVALENT INPUT OFFSET VOLTAGE DUE TO 500 400 300 200 100 0 0 THREE EXAMPLES OF EQUIVALENT INPUT OFFSET VOLTAGE DUE TO CHANGE IN COMMON MODE VOLTAGE vs. COMMON MODE VOLTAGE 500 400 300 ...

Page 10

TYPICAL PERFORMANCE CHARACTERISTICS 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 ...

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ALD1721EDA ALD [Advanced Linear Devices], ALD1721EDA Datasheet

ALD1721EDA

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ALD1721EDA Summary of contents

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