ALD1721E Datasheet, PDF (1/10 Pages) Advanced Linear Devices – EPAD™ MICROPOWER OPERATIONAL AMPLIFIER

ADVANCED
LINEAR
DEVICES, INC.
ALD1721E/ALD1721
EPAD™ MICROPOWER OPERATIONAL AMPLIFIER
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 35µV
input offset voltage simultaneously
• 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/µs, and low typical supply current
of 120 uA.
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
PIN CONFIGURATION
ORDERING INFORMATION
Operating Temperature Range
VE1 1
-IN 2
2
8 VE2
7 V+
-55°C to +125°C
8-Pin
CERDIP
Package
ALD1721E DA
ALD1721 DA
0°C to +70°C
8-Pin
Small Outline
Package (SOIC)
ALD1721E SA
ALD1721 SA
0°C to +70°C
8-Pin
Plastic Dip
Package
ALD1721E PA
ALD1721 PA
+IN 3
6
V- 4
5
TOP VIEW
DA, PA, SA PACKAGE
OUT
N/C
* Contact factory for industrial temperature range
© 1998 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: [phone] Fax: [phone] http://www.aldinc.com