A
DVANCED
L
INEAR
D
EVICES,
I
NC.
ALD4704A/ALD4704B
ALD4704
QUAD RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
The ALD4704 is a quad CMOS monolithic operational amplifier with
MOSFET input that has rail-to-rail input and output voltage ranges. The
input voltage can be beyond positive power supply voltage V+ or the
negative power supply voltage V- by up to 300mV. The output voltage
swings to within 60mV of either positive or negative power supply voltages
at rated load.
With high impedance load, the output voltage approaches to within 1mV
of the power supply rails. This device is designed as an alternative to the
popular J-FET input operational amplifiers in applications where lower
operating voltages, such as 9V battery or
±3.25V
to
±6V
power supplies
are being used. It offers high slew rate of 5V/µs at low operating power.
The ALD4704 is designed and manufactured with Advanced Linear
Devices' standard enhanced ACMOS silicon gate CMOS process for low
unit cost and exceptional reliability.
The rail-to-rail input and output feature of the ALD4704 expand signal
voltage range for a given operating supply voltage and allow numerous
analog serial stages to be implemented without losing operating voltage
margin. The output stage is designed to drive up to 10mA into 400pF
capacitive and 1.5KΩ resistive loads at unity gain and up to 4000pF at a
gain of 5. Short circuit protection to either ground or the power supply rails
is at approximately 15mA clamp current. The output can both source and
sink 10mA into a load with symmetrical drive and is ideally suited for
applications where push-pull voltage drive is desired.
For each of the operational amplifier, the offset voltage is trimmed on-chip
to eliminate the need for external nulling in many applications. For
precision applications, the output is designed to settle to 0.1% in 2µs. For
large signal buffer applications, the operational amplifier can function as
an ultrahigh input impedance voltage follower/buffer that allows input
and output voltage swings from positive to negative supply voltages. This
feature is intended to greatly simplify systems design and eliminate higher
voltage power supplies in many applications.
FEATURES
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Rail-to-rail input and output voltage ranges
5.0V/µs slew rate
Symmetrical push-pull output drive
Inputs can extend beyond supply rails by
300mV
Outputs settle to 2mV of supply rails
High capacitive load capability -- up to
4000pF
No frequency compensation required –
unity gain stable
Extremely low input bias currents -- 1.0pA
typical (20pA max.)
Ideal for high source impedance applica-
tions
High voltage gain -- typically 100V/mV
Output short circuit protected
Unity gain bandwidth of 2.1MHz
APPLICATIONS
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Voltage amplifier
Voltage follower/buffer
Charge integrator
Photodiode amplifier
Data acquisition systems
High performance portable
instruments
Signal conditioning circuits
Low leakage amplifiers
Active filters
Sample/Hold amplifier
Picoammeter
Current to voltage converter
Coaxial cable driver
Capacitive sensor amplifier
Piezoelectric transducer amplifier
PIN CONFIGURATION
OUT
A
-IN
A
1
2
14
13
12
11
10
9
8
OUT
D
-IN
D
+IN
D
V-
+IN
C
-IN
C
OUT
C
ORDERING INFORMATION
Operating Temperature Range*
-55°C to +125°C
0°C to +70°C
0°C to +70°C
14-Pin
CERDIP
Package
ALD4704A DB
ALD4704B DB
ALD4704 DB
14-Pin
Small Outline
Package (SOIC)
ALD4704A SB
ALD4704B SB
ALD4704 SB
14-Pin
Plastic Dip
Package
ALD4704A PB
ALD4704B PB
ALD4704 PB
+IN
A
3
V+
4
+IN
B
5
-IN
B
OUT
B
6
7
* Contact factory for industrial temperature range
DB, PB, SB Package
© 1998 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com
ALD [ ADVANCED LINEAR DEVICES ]
