A
L
D
DVANCED
INEAR
EVICES, INC.
ALD1722E/ALD1722
EPAD™ OPERATIONAL AMPLIFIER
BENEFITS
KEY FEATURES
• 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
• EPAD ( Electrically Programmable Analog Device)
• User programmable V
trimmer
• Computer-assisted trimming
• Rail-to-rail input/output
• Compatible with standard EPAD Programmer
• High precision through in-situ circuit precision trimming
OS
• Reduce or eliminate V , PSRR, CMRR and TCV
errors
OS
OS
• System level “calibration” capability
• In-System Programming capable
• Extremely small total functional
volume size
• Electrically programmable to compensate for external
component tolerances
• Low system implementation cost
• Low power
• Achieve 0.01pA input bias current and 25µV
input offset voltage simultaneously
• Compatible with industry standard pinout
APPLICATIONS
GENERAL DESCRIPTION
The ALD1722E/ALD1722 is a monolithic rail-to-rail precision CMOS
operational amplifier with integrated user programmable EPAD (Electri-
callyProgrammableAnalogDevice)basedoffsetvoltageadjustment. 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,thesetparametersarestoredindefinitelywithinthedeviceeven
afterpower-down. EPADoffersthecircuitdesigneraconvenientandcost-
effective trimming solution for achieving the very highest amplifier/system
performance.
• 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
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.
PIN CONFIGURATION
VE1
-IN
1
8
7
6
5
VE2
ORDERING INFORMATION
Operating Temperature Range*
2
+
V
2
-55°C to +125°C
0°C to +70°C
0°C to +70°C
+IN
3
4
OUT
N/C
8-Pin
8-Pin
8-Pin
CERDIP
Small Outline
Plastic Dip
-
V
Package
Package (SOIC)
Package
TOP VIEW
DA, PA, SA PACKAGE
ALD1722E DA
ALD1722 DA
ALD1722E SA
ALD1722 SA
ALD1722E PA
ALD1722 PA
* Contact factory for industrial temperature range
ALD1722E/ALD1722
Advanced Linear Devices
1