ALD1721E ALD [Advanced Linear Devices], ALD1721E Datasheet

ALD1721E

Manufacturer Part Number

ALD1721E

Description

Manufacturer

ALD [Advanced Linear Devices]

Datasheet

1.ALD1721E.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 ALD1721E

ALD1721E Summary of contents

Page 1

... 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 ...

Page 2

... User appli- cation-specific circuit programming refers to the situation where the Total Input Offset Voltage of the ALD1721E can be trimmed with the actual intended operating conditions. The ALD1721E is pre-programmed at the factory under standard operating conditions for minimum equivalent input offset voltage ...

Page 3

... Input Offset Voltage Drift Initial Power Supply 8 Rejection Ratio Initial Common Mode 8 Rejection Ratio Large Signal Voltage Gain Output Voltage Range Output Short Circuit Current \* NOTES 1 through 9, see section titled "Definitions and Design Notes". ALD1721E/ALD1721 PA,SA package DA package 1721E Symbol Min Typ Max V S 1.0 5 ...

Page 4

... Test Conditions 120 200 Load 0 1KHz 0.6 fA =10Hz 700 KHz 0 10K 0 10K 100K , 50pF 1,R L =100K 50pF Typ Max Unit Test Conditions 0.02 V/ 1000 hrs 1.7 V 1 ALD1721E/ALD1721 ...

Page 5

... Initial Power Supply PSRR i 8 Rejection Ratio Initial Common Mode CMRR i 8 Rejection Ratio Large Signal Voltage Gain A V Output Voltage Range V O low V O high Bandwidth B W Slew Rate S R ALD1721E/ALD1721 1721E 1721 Min Typ Max Min 0.5 2.0 2 -2.47 -2.40 -2 ...

Page 6

... SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE INPUTS GROUNDED -25 C OUTPUT UNLOADED SUPPLY VOLTAGE (V) OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF FREQUENCY 100 1K 10K 100K FREQUENCY (Hz) ALD1721E/ALD1721 +125 +25 C +125 2. 135 180 1M 10M ...

Page 7

... SUPPLY VOLTAGE (V) OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF LOAD RESISTANCE 1000 100 10 1 10K 100K LOAD RESISTANCE ( ) LARGE - SIGNAL TRANSIENT RESPONSE 5V/div 2V/div ALD1721E/ALD1721 2. 10M 100 EXAMPLE 2. OST PROGRAMMING ...

Page 8

... FOR A COMMON MODE VOLTAGE RANGE OF 0.5V COMMON MODE VOLTAGE RANGE OF 0.5V CMRR = 80dB -0.2 -0.1 0.1 -0.3 0.0 COMMON MODE VOLTAGE (V) Advanced Linear Devices EXAMPLE B: V EPAD OS PROGRAMMED +8V SUPPLY SUPPLY CMRR = 80dB EPAD PROGRAMMED = + EPAD OS PROGRAMMED AT COMMON MODE VOLTAGE OF 0.25V 0.2 0.3 0.4 0.5 ALD1721E/ALD1721 ...

Page 9

... V BUDGET BEFORE 1000 OS EPAD PROGRAMMING 500 0 -500 + -1000 -1500 V BUDGET AFTER OS -2000 EPAD PROGRAMMING -2500 EXAMPLE C ALD1721E/ALD1721 X X Device input V OS PSRR equivalent CMRR equivalent equivalent Noise equivalent V OS External Error equivalent V OS Advanced Linear Devices ...

Page 10

... In addition, optional decoupling capacitors of 1000pF or greater value can be added to VE1 and VE2 terminals. F. The ALD1721E/ALD1721 is designed for use in low voltage, micropower circuits. The maximum operating voltage during normal operation should remain below 10 Volts at all times. Care ...

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