TM
A
L
D
DVANCED
INEAR
EVICES, INC.
®
e
EPAD
ALD1722E
®
EPAD LOW POWER CMOS OPERATIONAL AMPLIFIER
KEY FEATURES
BENEFITS
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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-system circuit precision trimming
Reduces or eliminates V , PSRR, CMRR and TCV
OS
System level “calibration” capability
Application Specific Programming mode
In-System Programming mode
• Eliminates manual system trimming
• Drive up to 4000pF load capacitance
• Remote controlled automated trimming
• In-System Programming capable
• Industry standard pinout
• Rail-to-rail input/output
• Input bias current of 0.01pA and
input offset voltage of 25µV
OS
errors
OS
• No external components
• No internal chopper clocking noise
• No chopper dynamic power dissipation
• Simple and cost effective
Electrically programmable to compensate for external
component tolerances
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Achieves 0.01pA input bias current and 25µV input offset
voltage simultaneously
Compatible with industry standard pinout
• Small package size
• Low power
APPLICATIONS
GENERAL DESCRIPTION
• Sensor interface circuits
• Unity gain buffer amplifier
• Precision analog cable driver
• 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
• Current sources
The ALD1722E 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 ALD1722E
is a direct replacement of the ALD1712 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 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 perfor-
mance.
• Periodic In-system calibration
• System output level shifter
The ALD1722E 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, extremely low input
currents of 0.01pA typical, high open loop voltage gain, useful bandwidth
of 1.5MHz, slew rate of 2.1V/µs, and low supply current of 0.8mA.
PIN CONFIGURATION
VE1
-IN
1
8
7
6
5
VE2
ORDERING INFORMATION (“L” suffix denotes lead-free (RoHS))
2
+
V
2
Operating Temperature Range
0°C to +70°C
0°C to +70°C
-55°C to +125°C
+IN
3
4
OUT
N/C
8-Pin
8-Pin
8-Pin
-
Small Outline
Package (SOIC)
Plastic Dip
Package
CERDIP
Package
V
TOP VIEW
SAL, PAL, DA PACKAGES
ALD1722ESAL
ALD1722EPAL
ALD1722EDA
* 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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