ADVANCED
LINEAR
DEVICES, INC.
ALD1726E/ALD1726
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
+
EPAD™ ULTRA MICROPOWER OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
The ALD1726E/ALD1726 is a monolithic rail-to-rail ultra-micropower
precision CMOS operational amplifier with integrated user programmable
EPAD (Electrically Programmable Analog Device) based offset voltage
adjustment. The ALD1726E/ALD1726 is a direct replacement of the
ALD1706 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 ALD1726E/ALD1726 operational amplifier features rail-to-rail input
and output voltage ranges, tolerance to over-voltage input spikes of
300mV beyond supply rails, extremely low input currents of 0.01pA typical,
high open loop voltage gain, useful bandwidth of 200KHz, slew rate of 0.17
V/µs, and low typical supply current of 25µA.
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
• 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
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-system circuit precision trimming
• Reduces or eliminates V
OS
, PSRR, CMRR and TCV
OS
errors
• System level “calibration” capability
• Application-Specific Programming mode
• In-System Programming mode
• Electrically programmable to compensate for
external component tolerances
• Achieves 0.01pA input bias current and 50µV
input offset voltage simultaneously
• Compatible with industry standard pinout
ORDERING INFORMATION
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
ALD1726E DA ALD1726E SA ALD1726E PA
ALD1726 DA ALD1726 SA ALD1726 PA
* Contact factory for industrial temperature range
© 1998 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com