
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
GENERAL DESCRIPTION
The ALD2722E/ALD2722 is a dual monolithic rail-to-rail precision CMOS
operational amplifier with integrated user programmable EPAD (Electri-
cally Programmable Analog Device) based offset voltage adjustment. The
ALD2722E/ALD2722 is a dual version of the ALD1722E/ALD2722 opera-
tional amplifier. Each ALD2722E/ALD2722 operational amplifier features
individual user-programming offset voltage trimming, resulting in signifi-
cantly 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 performance.
The ALD2722E/ALD2722 dual 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, ex-
tremely low input currents of 0.01pA typical, high open loop voltage gain,
useful bandwidth of 1.5MHz, slew rate of 1.9V/
s, and low typical supply
current of 2mA for both amplifiers.
BENEFITS
 Eliminates manual and elaborate
system trimming procedures
 Remote controlled automated trimming
 In-System Programming capability
 No external components
 No internal clocking noise source
 Simple and cost effective
 Small package size
 Extremely small total functional
volume size
 Low system implementation cost
 Low power
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
5V single supply operation
EPAD (Electrically Programmable Analog Device)
User programmable VOS trimmer
Computer-assisted trimming
Rail-to-rail input/output
Compatible with standard EPAD Programmer
Each amplifier VOS can be trimmed to a different VOS level
High precision through in-system circuit precision trimming
Reduces or eliminates VOS, PSRR, CMRR and TCVOS 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
V input offset
voltage simultaneously
Low voltage operation
1
2
3
4
5
6
7
11
12
13
14
8
9
10
VE 2A
VE 1A
V-
N/C
VE 2B
VE 1B
OUT B
OUT A
+IN A
-IN A
+IN B
-IN B
N/C
V+
PIN CONFIGURATION
TOP VIEW
SB, PB, DB PACKAGES
* N/C Pins are internally connected. Do not connect externally.
ORDERING INFORMATION
Operating Temperature Range
0
°C to +70°C0°C to +70°C
-55
°C to +125°C
14-Pin
Small Outline
Plastic Dip
CERDIP
Package (SOIC)
Package
ALD2722ESB
ALD2722EPB
ALD2722EDB
ALD2722SB
ALD2722PB
ALD2722DB
* Contact factory for high temperature versions.
eEPAD
TM
N
A
B
L
E
D
E
DUAL EPAD LOW POWER CMOS OPERATIONAL AMPLIFIER
ALD2722E/ALD2722
ADVANCED
LINEAR
DEVICES, INC.