A
DVANCED
L
INEAR
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EVICES,
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NC.
ALD1706A/ALD1706B
ALD1706/ALD1706G
ULTRA MICROPOWER RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
The ALD1706A/ALD1706B/ALD1706/ALD1706G is a monolithic CMOS
ultra micropower high slew-rate, high performance 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 40µA maximum at 5V supply
voltage. It is manufactured with Advanced Linear Devices' enhanced
ACMOS silicon gate CMOS process.
The ALD1706A/ALD1706B/ALD1706/ALD1706G is designed to offer high
performance for a wide range of applications requiring very low power
dissipation. It has been developed specifically for the +5V single battery
or
±1V
to
±5V
dual battery user and offers the popular industry standard
single operational amplifier pin configuration.
Several important characteristics of the device make application easier
to implement at those voltages. First, the operational amplifier can
operate with rail to rail input and output voltages. This means the signal
input voltage and output voltage can be close to or 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 25pF capacitive and 20KΩ
resistive loads. These features, combined with extremely low input
currents, high open loop voltage gain of 100V/mV, useful bandwidth of
400KHz, a slew rate of 0.17V/µs, low offset voltage and temperature
drift, make the ALD1706A/ALD1706B/ALD1706/ALD1706G a versatile,
micropower operational amplifier.
The ALD1706A/ALD1706B/ALD1706/ALD1706G, designed and
fabricated with silicon gate CMOS technology, offers 0.1 pA typical input
bias current. On chip offset voltage trimming allows the device to be
used without nulling in most applications. Additionally, robust design
and rigorous screening make this device especially suitable for operation
in temperature-extreme environments and rugged conditions.
FEATURES
• 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
• Extremely low input bias currents --
1.0pA typical (30pA max.)
• Ideal for high source impedance applications
• Dual power supply
±1.0V
to
±5.0V
operation
• Single power supply +2.0V to +10.0V
operation
• 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
• Low power dissipation
• Suitable for rugged, temperature-extreme
environments
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
Sample/Hold amplifier
Picoammeter
Current to voltage converter
PIN CONFIGURATION
ORDERING INFORMATION
(“L” suffix denotes lead-free (RoHS))
Operating Temperature Range
0°C to +70°C
0°C to +70°C
-55°C to 125°C
8-Pin
Small Outline
Package (SOIC)
ALD1706ASAL
ALD1706BSAL
ALD1706SAL
ALD1706GSAL
8-Pin
Plastic Dip
Package
ALD1706APAL
ALD1706BPAL
ALD1706PAL
ALD1706GPAL
8-Pin
CERDIP
Package
ALD1706ADA
ALD1706BDA
ALD1706DA
N/C
-IN
+IN
V-
1
2
3
4
TOP VIEW
SAL, PAL, DA PACKAGES
* N/C pins are internally connected. Do not connect externally.
8
2
7
6
5
N/C
V+
OUT
N/C
* Contact factory for leaded (non-RoHS) or high temperature versions.
Rev 2.1 ©2010 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286
www.aldinc.com
Design & Operating Notes:
1. The ALD1706A/ALD1706B/ALD1706/ALD1706G CMOS operational
amplifier uses a 3 gain stage architecture and an improved
frequency compensation scheme to achieve large voltage gain,
high output driving capability, and better frequency stability. In a
conventional CMOS operational amplifier design, compensation
is achieved with a pole splitting capacitor together with a nulling
resistor. This method is, however, very bias dependent and thus
cannot accommodate the large range of supply voltage operation
as is required from a stand alone CMOS operational amplifier. The
ALD1706A/ALD1706B/ALD1706/ALD1706G is internally
compensated for unity gain stability using a novel scheme that does
not use a nulling resistor. This scheme produces a clean single
pole roll off in the gain characteristics while providing for more
than 70 degrees of phase margin at the unity gain frequency.
2. The ALD1706A/ALD1706B/ALD1706/ALD1706G has complementary
p-channel and n-channel input differential stages connected in
parallel to accomplish rail-to-rail input common mode voltage range.
This means that with the ranges of common mode input voltage
close to the power supplies, one of the two differential stages is
switched off internally. To maintain compatibility with other
operational amplifiers, this switching point has been selected to
be about 1.5V below the positive supply voltage. Since offset
voltage trimming on the ALD1706A/ALD1706B/ALD1706/ALD1706G
is made when the input voltage is symmetrical to the supply
voltages, this internal switching does not affect a large variety of
applications such as an inverting amplifier or non-inverting amplifier
with a gain larger than 2.5 (5V operation), where the common mode
voltage does not make excursions above this switching point. The
user should however, be aware that this switching does take place
if the operational amplifier is connected as a unity gain buffer and
should make provision in his design to allow for input offset voltage
variations.
3. The input bias and offset currents are essentially input protection
diode reverse bias leakage currents, and are typically less than
1pA at room temperature. This low input bias current assures that
the analog signal from the source will not be distorted by input
bias currents. Normally, this extremely high input impedance of
greater than 10
12
Ω
would not be a problem as the source impedance
would limit the node impedance. However, for applications where
source impedance is very high, it may be necessary to limit noise
and hum pickup through proper shielding.
4. The output stage consists of class AB complementary output
drivers, capable of driving a low resistance load. The output voltage
swing is limited by the drain to source on-resistance of the output
transistors as determined by the bias circuitry, and the value of the
load resistor. When connected in the voltage follower configuration,
the oscillation resistant feature, combined with the rail to rail input
and output feature, makes an effective analog signal buffer for
medium to high source impedance sensors, transducers, and other
circuit networks.
5. The ALD1706A/ALD1706B/ALD1706/ALD1706G operational
amplifier has been designed to provide full static discharge
protection. Internally, the design has been carefully implemented
to minimize latch up. However, care must be exercised when
handling the device to avoid strong static fields that may degrade
a diode junction, causing increased input leakage currents. In using
the operational amplifier, the user is advised to power up the circuit
before, or simultaneously with, any input voltages applied and to
limit input voltages to not exceed 0.3V of the power supply voltage
levels.
6. The ALD1706A/ALD1706B/ALD1706/ALD1706G , with its micropower
operation, offers numerous benefits in reduced power supply
requirements, less noise coupling and current spikes, less thermally
induced drift, better overall reliability due to lower self heating, and
lower input bias current. It requires practically no warm up time as
the chip junction heats less than 0.1°C above ambient temperature
under most operating conditions.
TYPICAL PERFORMANCE CHARACTERISTICS
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
INPUTS GROUNDED
OUTPUT UNLOADED
80
-25°C
60
40
20
0
0
±1
+70°C
±2
±3
±4
SUPPLY VOLTAGE (V)
+125°C
±5
±6
T
A
= -55°C
±7
COMMON MODE INPUT
VOLTAGE RANGE (V)
COMMON MODE INPUT VOLTAGE RANGE
AS A FUNCTION OF SUPPLY VOLTAGE
±6
±5
±4
±3
±2
±1
0
0
±1
±2
±3
±4
±5
±6
±7
SUPPLY VOLTAGE (V)
T
A
= 25°C
SUPPLY CURRENT (µA)
+25°C
OPEN LOOP VOLTAGE GAIN AS AFUNCTION
OF LOAD RESISTANCE
1000
10000
INPUT BIAS CURRENT AS A FUNCTION
OF AMBIENT TEMPERATURE
INPUT BIAS CURRENT (pA)
OPEN LOOP VOLTAGE
GAIN (V/mV)
1000
100
V
S
=
±2.5V
100
10
10
V
S
=
±2.5V
T
A
= 25°C
1
10K
100K
1M
10M
1.0
0.1
-50
-25
0
25
50
75
100
125
LOAD RESISTANCE (Ω)
AMBIENT TEMPERATURE (°C)
ALD1706A/ALD1706B
ALD1706/ALD1706G
Advanced Linear Devices
4 of 9
Discrete Device
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