A
DVANCED
L
INEAR
D
EVICES,
I
NC.
ALD1722E/ALD1722
EPAD™ OPERATIONAL AMPLIFIER
KEY FEATURES
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EPAD ( Electrically Programmable Analog Device)
User programmable V
OS
trimmer
Computer-assisted trimming
Rail-to-rail input/output
Compatible with standard EPAD Programmer
High precision through in-situ circuit precision trimming
Reduce or eliminate V
OS
, PSRR, CMRR and TCV
OS
errors
System level “calibration” capability
In-System Programming capable
Electrically programmable to compensate for external
component tolerances
• Achieve 0.01pA input bias current and 25
µ
V
input offset voltage simultaneously
• Compatible with industry standard pinout
GENERAL DESCRIPTION
The ALD1722E/ALD1722 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
ALD1722E/ALD1722 is a direct replacement of the ALD1702 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 pro-
grammed, 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 ALD1722E/ALD1722 operational amplifier features rail-to-rail input
and output voltage ranges, tolerance to over-voltage input spikes of
300mV beyond supply rails, high capacitive loading up to 4000pF, ex-
tremely low input currents of 0.01pA typical, high open loop voltage gain,
useful bandwidth of 1.5 MHz, slew rate of 2.1 V/µs, and low supply current
of 0.8mA.
BENEFITS
• Eliminates manual and elaborate
system trimming procedures
• 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
volume size
• Low system implementation cost
• Low power
APPLICATIONS
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Sensor interface circuits
Transducer biasing circuits
Capacitive and charge integration circuits
Biochemical probe interface
Signal conditioning
Portable instruments
High source impedance electrode
amplifiers
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
1
2
3
4
TOP VIEW
DA, PA, SA PACKAGE
2
8
7
6
5
VE2
V+
OUT
N/C
ORDERING INFORMATION
Operating Temperature Range*
-55°C to +125°C
0°C to +70°C
0°C to +70°C
8-Pin
CERDIP
Package
8-Pin
Small Outline
Package (SOIC)
8-Pin
Plastic Dip
Package
-IN
+IN
V-
ALD1722E DA
ALD1722 DA
ALD1722E SA
ALD1722 SA
ALD1722E PA
ALD1722 PA
* Contact factory for industrial temperature range
ALD1722E/ALD1722
Advanced Linear Devices
1
ALD [ ADVANCED LINEAR DEVICES ]
