A
DVANCED
L
INEAR
D
EVICES,
I
NC.
TM
ALD1722E
e
®
EPAD
D
LE
AB
E
N
EPAD® LOW POWER CMOS OPERATIONAL AMPLIFIER
KEY FEATURES
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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 25
µ
V input offset
voltage simultaneously
Compatible with industry standard pinout
BENEFITS
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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
No external components
No internal chopper clocking noise
No chopper dynamic power dissipation
Simple and cost effective
Small package size
Low power
APPLICATIONS
GENERAL DESCRIPTION
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.
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.
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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
Periodic In-system calibration
System output level shifter
PIN CONFIGURATION
VE1
1
2
3
4
TOP VIEW
SAL, PAL, DA PACKAGES
* N/C Pin is internally connected. Do not connect externally.
8
2
7
6
5
VE2
V+
OUT
N/C
ORDERING INFORMATION
(“L” suffix denotes lead-free (RoHS))
Operating Temperature Range
0°C to +70°C
8-Pin
Small Outline
Package (SOIC)
ALD1722ESAL
0°C to +70°C
8-Pin
Plastic Dip
Package
ALD1722EPAL
-55°C to +125°C
8-Pin
CERDIP
Package
ALD1722EDA
-IN
+IN
V-
* 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
ALD [ ADVANCED LINEAR DEVICES ]
