TM
A
L
D
DVANCED
INEAR
EVICES, INC.
®
e
EPAD
ALD1721E
®
EPAD MICROPOWER CMOS OPERATIONAL AMPLIFIER
KEY FEATURES
BENEFITS
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EPAD (Electrically Programmable Analog Device)
trimmer
Computer-assisted trimming
Rail-to-rail input/output
Compatible with standard EPAD Programmer
High precision through in-system circuit precision trimming
• 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
User programmable V
OS
Reduces or eliminates V , PSRR, CMRR and TCV
errors
OS
OS
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
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Compatible with industry standard pinout
APPLICATIONS
GENERAL DESCRIPTION
• Sensor interface circuits
The ALD1721E is a monolithic rail-to-rail precision CMOS operational
amplifier with integrated user programmable EPAD (Electrically Program-
mable Analog Device) based offset voltage adjustment. The ALD1721E
operational amplifier is a direct replacement of the ALD1701 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
aidofapersonal computerundersoftwarecontrol. Onceprogrammed,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 perfor-
mance.
• 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 ALD1721E 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 0.7V/µs, and low typical supply current of 120µA.
PIN CONFIGURATION
VE1
-IN
1
8
7
6
5
VE2
2
+
2
V
ORDERING INFORMATION (“L” suffix denotes lead-free (RoHS))
Operating Temperature Range
+IN
3
4
OUT
N/C
0°C to +70°C
0°C to +70°C
-55°C to +125°C
-
V
8-Pin
8-Pin
8-Pin
Small Outline
Package (SOIC)
Plastic Dip
Package
CERDIP
Package
TOP VIEW
SAL, PAL, DA PACKAGES
ALD1721ESAL
ALD1721EPAL
ALD1721EDA
* N/C Pin is internally connected. Do not connect externally.
* Contact factory for leaded (non-RoHS) or high temperature versions.
Rev 2.1 ©2011 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286
www.aldinc.com
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