TM
ADVANCED
LINEAR
DEVICES, INC.
®
e
EPAD
ALD1731A/ALD1731
PRECISION MICROPOWER CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
FEATURES & BENEFITS
The ALD1731A/ALD1731 is a precision, low cost, monolithic CMOS
micropower high slew rate operational amplifier intended for a broad
range of analog applications using ±1V to ±5V dual power supply
systems, as well as +2V to +10V battery operated systems. All device
characteristics are specified for +5V single supply or ±2.5V dual supply
systems. Supply current is 250µA maximum at 5V supply voltage. It is
• Extremely low input offset voltages --
35µV typical
• Extremely low input bias currents --
0.01pA typical
• All parameters specified for +5V single
supply or ±2.5V dual supply systems
• Rail to rail input and output voltage ranges
• No frequency compensation required --
unity gain stable
®
manufactured with Advanced Linear Devices' enhanced EPAD silicon
gate CMOS process.
The ALD1731A/ALD1731 features extremely low input power require-
ments, practically removing any loading effects on high source imped-
ancesignalsourcessuchascpacitivesensors. Thesedevicesdonotadd
anysignificanterrors, regardlessofwhatthesouceimpedancevariations
may be, thereby improving overall system precision and accuracy. The
device is designed to offer the benefits of CMOS technology by providing
a wide range of desired specifications. The most important of these
specifications is extremely low input bias/offset currents at extremely low
inputoffsetvoltages. Ithasbeendevelopedspecificallyforthe+5Vsingle
supply or ±1V to ±5V dual supply user and offers the popular industry
standard pin configuration of µA741 and ICL7611 types.
• Idealforhighsourceimpedanceapplications
• Dual power supplies ±1.0V to ±5.0V
• Single power supply +2.0V to +10.0V
• High voltage gain -- typically 100V/mV
@ ±2.5V(100dB)
• Drive as low as 10KΩ load
• Output short circuit protected
• Unity gain bandwidth of 0.7MHz
• Slew rate of 0.7V/µs
• Micropower dissipation
• Suitable for rugged, temperature-extreme
environments
Several additional important characteristics of the device make applica-
tioneasiertoimplementatthosevoltages. First, theoperationalamplifier
can operate with rail to rail input and output voltages. This means the
signal input voltage and output voltage can be equal to the positive and
negative supply voltages. This feature allows numerous analog serial
stages and flexibility in input signal bias levels. Second, the device was
designed to accommodate mixed applications where digital and analog
circuits may operate off the same power supply or battery. Third, the
output stage can typically drive up to 50pF capacitive and 10KΩ resistive
loads.
APPLICATIONS
• Voltage amplifier
• Voltage follower/buffer
• Charge integrator
• Photodiode amplifier
• Data acquisition systems
• High performance portable instruments
• Signal conditioning circuits
• Sensor and transducer amplifiers
• Low leakage amplifiers
• Active filters
These features, combined with extremely low input currents, high open
loop voltage gain of 100V/mV, useful bandwidth of 700KHz, a slew rate
of 0.7V/µs, low power dissipation of 0.5mW, low offset voltage and
temperaturedrift,maketheALD1731A/ALD1731aversatile,micropower
operational amplifier.
• Sample/Hold amplifier
• Picoammeter
• Current to voltage converter
The ALD1731A/ALD1731, designed and fabricated with silicon gate
CMOStechnology,offers0.01pAtypicalinputbiascurrent. Onchipoffset
voltage trimming, using EPAD technology, allows the device to be used
without nulling. Additionally, robust design and rigorous screening make
this device especially suitable for operation in temperature-extreme
environments and rugged conditions.
PIN CONFIGURATION
I/C
-IN
1
8
7
6
5
I/C
ORDERING INFORMATION (“L” suffix denotes lead-free (RoHS))
Operating Temperature Range
2
+
V
2
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
ALD1731ASAL
ALD1731SAL
ALD1731ASA
ALD1731SA
ALD1731APAL
ALD1731PAL
TOP VIEW
SAL, PAL, SA, DA PACKAGES
ALD1731ADA
ALD1731DA
* I/C pins are internally connected. Do not connect externally.
* Contact factory for leaded (non-RoHS) or high temperature versions.
©2014 Advanced Linear Devices, Inc., Vers. 2.0
www.aldinc.com
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