ALD1722E/ALD1722 Advanced Linear Devices 1
EPAD™ OPERATIONAL AMPLIFIER
ADVANCED
LINEAR
DEVICES, INC.
ALD1722E/ALD1722
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
* Contact factory for industrial temperature range
Operating Temperature Range*
-55°C to +125°C0°C to +70°C0°C to +70°C
8-Pin 8-Pin 8-Pin
CERDIP Small Outline Plastic Dip
Package Package (SOIC) Package
ALD1722E DA ALD1722E SA ALD1722E PA
ALD1722 DA ALD1722 SA ALD1722 PA
ORDERING INFORMATION
PIN CONFIGURATION
1
2
2
3
4
8
7
6
5
TOP VIEW
DA, PA, SA PACKAGE
VE1
-IN
+IN
VE2
OUT
N/CV
-
V
+
APPLICATIONS
• 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
KEY FEATURES
• 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 25µV
input offset voltage simultaneously
• Compatible with industry standard pinout