Rev 2.0 ©2010 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286
www.aldinc.com
DUAL ULTRA MICROPOWER RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
ALD2706A/ALD2706B
ALD2706
ADVANCED
LINEAR
DEVICES, INC.
Operating Temperature Range
0°C to +70°C0°C to +70°C -55°C to 125°C
8-Pin 8-Pin 8-Pin
Small Outline Plastic Dip CERDIP
Package (SOIC) Package Package
ALD2706ASAL ALD2706APAL ALD2706ADA
ALD2706BSAL ALD2706BPAL ALD2706BDA
ALD2706SAL ALD2706PAL ALD2706DA
* Contact factory for leaded (non-RoHS) or high temperature versions.
ORDERING INFORMATION (“L” suffix denotes lead-free (RoHS))
GENERAL DESCRIPTION
The ALD2706A/ALD2706B/ALD2706 is a dual 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 80µA maximum at 5V supply voltage. It is manufactured with
Advanced Linear Devices' enhanced A CMOS silicon gate CMOS process.
The ALD2706A/ALD2706B/ALD2706 is designed to offer a trade-off of
performance parameters providing a wide range of desired specifications.
It has been developed specifically for the +5V single supply or ±1V to ±5V
dual supply user and offers the popular industry standard pin configuration.
Several important characteristics of the device make application easier to
implement at those voltages. First, each operational amplifier 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, each 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 200KHz, a slew rate of 0.1V/
µs, low offset voltage and temperature drift, make the ALD2706A/
ALD2706B/ALD2706 a versatile, micropower dual operational amplifier.
A typical ALD2706A/ALD2706B/ALD2706 has the capacity to process a
0.998V amplitude analog signal with only 1.000V single supply voltage,
while requiring only 0.1pA input bias current. Additionally, robust design
and rigorous screening make this device especially suitable for operation
in temperature-extreme environments and rugged conditions.
FEATURES
• Typical 20µA supply current per amplifier
• All parameters specified for +5V single
supply or ±2.5V dual supply systems
• Rail-to-rail input and output voltage ranges
• Unity gain stable
• Extremely low input bias currents -- 0.1pA
• High source impedance applications
• Dual power supply ±1.0V to ±5.0V
• Single power supply +2V to +10V
• High voltage gain
• Unity gain bandwidth of 0.2MHz
• Slew rate of 0.1V/µs
• Symmetrical output drive
• Suitable for rugged, temperature-extreme
environments
APPLICATIONS
• Voltage follower/buffer/amplifier
• 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
TOP VIEW
SAL, PAL, DA PACKAGES
1
2
3
4
8
7
6
5
OUT A
-IN A
+IN A
V+
-IN B
+IN B
V-
OUT B
ALD2706A/ALD2706B Advanced Linear Devices 2 of 9
ALD2706
ABSOLUTE MAXIMUM RATINGS
Supply voltage, V+ 10.6V
Differential input voltage range -0.3V to V+ +0.3V
Power dissipation 600 mW
Operating temperature range SAL, PAL packages 0°C to +70°C
DA package -55°C to +125°C
Storage temperature range -65°C to +150°C
Lead temperature, 10 seconds +260°C
CAUTION: ESD Sensitive Device. Use static control procedures in ESD controlled environment.
Supply VS±1.0 ±5.0 ±1.0 ±5.0 ±1.0 ±5.0 V Dual Supply
Voltage V+2.0 10.0 2.0 10.0 2.0 10.0 V Single Supply
Input Offset VOS 2.0 5.0 10.0 mV RS ≤ 100KΩ
Voltage 2.8 5.8 11.0 mV 0°C ≤ TA ≤ +70°C
Input Offset IOS 0.1 20 0.1 20 0.1 20 pA TA = 25°C
Current 200 200 200 pA 0°C ≤ TA ≤ +70°C
Input Bias IB0.1 20 0.1 20 0.1 20 pA TA = 25°C
Current 200 200 200 pA 0°C ≤ TA ≤ +70°C
Input Voltage VIR -0.3 5.3 -0.3 5.3 -0.3 5.3 V V+ = +5
Range -2.8 2.8 -2.8 2.8 -2.8 2.8 V VS = ±2.5V
Input
Resistance RIN 1012 1012 1012 Ω
Input Offset
Voltage Drift TCVOS 7710µV/°CR
S ≤ 100KΩ
Power Supply PSRR 65 80 65 80 60 80 dB RS ≤ 100KΩ
Rejection Ratio 65 80 65 80 60 80 dB 0°C ≤ TA ≤ +70°C
Common Mode CMRR 65 83 65 83 60 83 dB RS ≤ 100KΩ
Rejection Ratio 65 83 65 83 60 83 dB 0°C ≤ TA ≤ +70°C
Large Signal AV10 100 10 100 5 80 V/mV RL = 100KΩ
Voltage Gain 300 300 300 V/mV RL ≥ 1MΩ
10 10 5 V/mV RL = 100KΩ
0°C ≤ TA ≤ +70°C
Output VO low 0.001 0.01 0.001 0.01 0.001 0.01 V RL = 1MΩ V+ = +5V
Voltage VO high 4.99 4.999 4.99 4.999 4.99 4.999 V 0°C ≤ TA ≤ +70°C
Range VO low -2.40 -2.25 -2.40 -2.25 -2.40 -2.25 V RL = 100KΩ
VO high 2.25 2.40 2.25 2.40 2.25 2.40 V 0 °C ≤ TA ≤ +70°C
Output Short
Circuit Current ISC 200 200 200 µA
Supply Current IS50 80 50 80 50 80 µAV
IN=0V
No Load
Power Both amplifiers
Dissipation PD400 400 400 µWV
S = ±2.5V
OPERATING ELECTRICAL CHARACTERISTICS
TA = 25°C VS = ±2.5V unless otherwise specified
2706A 2706B 2706 Test
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Unit Conditions
ALD2706A/ALD2706B Advanced Linear Devices 3 of 9
ALD2706
OPERATING ELECTRICAL CHARACTERISTICS (cont'd)
VS = ± 2.5V -55°C ≤ TA ≤ +125°C unless otherwise specified
Input Offset
Voltage VOS 3.0 6.0 12.0 mV RS ≤ 100KΩ
Input Offset
Current IOS 4.0 4.0 4.0 nA
Input Bias
Current IB4.0 4.0 4.0 nA
Power Supply
Rejection Ratio PSRR 60 75 60 75 60 75 dB RS ≤ 1MΩ
Common Mode
Rejection Ratio CMRR 60 83 60 83 60 83 dB RS ≤ 1MΩ
Large Signal
Voltage Gain AV10 50 10 50 5 50 V/mV RL = 1MΩ
Output Voltage VO low -2.40 -2.25 -2.40 -2.25 -2.40 -2.25 V
Range VO high 2.25 2.40 2.25 2.40 2.25 2.40 V RL = 1MΩ
2706ADA 2706BDA 2706DA Test
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Unit Conditions
Power Supply
Rejection Ratio PSRR 80 80 80 dB RS ≤ 1MΩ
Common Mode
Rejection Ratio CMRR 80 80 80 dB RS ≤ 1MΩ
Large Signal
Voltage Gain AV50 50 50 V/mV RL = 1MΩ
Output Voltage VO low -0.95 -0.9 -.95 -0.9 -0.95 -0.9 V RL = 1MΩ
Range VO high 0.9 0.95 0.9 0.95 0.9 0.95 V
Bandwidth BW0.2 0.2 0.2 MHz
Slew Rate SR0.1 0.1 0.1 V/µsA
V =+1
CL = 25pF
TA = 25°C VS = ±1.0V unless otherwise specified
2706A 2706B 2706 Test
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Unit Conditions
Input
Capacitance CIN 111pF
Bandwidth BW200 200 200 KHz
Slew Rate SR0.1 0.1 0.1 V/µsA
V = +1
RL = 100KΩ
Rise time tr1.0 1.0 1.0 µsR
L = 100KΩ
Overshoot 20 20 20 % RL = 100KΩ
Factor CL = 25pF
Settling 10.0 10.0 10.0 µs 0.1%
Time tsAV = -1
CL = 25pF RL = 100KΩ
Channel
Separation CS140 140 140 dB AV = 100
TA = 25°C VS = ±2.5V unless otherwise specified
2706A 2706B 2706 Test
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Unit Conditions
ALD2706A/ALD2706B Advanced Linear Devices 4 of 9
ALD2706
TYPICAL PERFORMANCE CHARACTERISTICS
INPUT BIAS CURRENT AS A FUNCTION
OF AMBIENT TEMPERATURE
AMBIENT TEMPERATURE (°C)
1000
100
10
0.1
1.0
INPUT BIAS CURRENT (pA)
100-25 0 75 1255025-50
10000
V
S
= ±2.5V
COMMON MODE INPUT VOLTAGE RANGE
AS A FUNCTION OF SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
COMMON MODE INPUT
VOLTAGE RANGE (V)
±7
±6
±5
±4
±3
±2
±1
00 ±1 ±2 ±3 ±4 ±5 ±6 ±7
T
A
= 25°C
Design & Operating Notes:
1. The ALD2706A/ALD2706B/ALD2706 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
ALD2706A/ALD2706B/ALD2706 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 ALD2706A/ALD2706B/ALD2706 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 ALD2706A/ALD2706B/ALD2706 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 1012Ω 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 ALD2706A/ALD2706B/ALD2706 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 ALD2706A/ALD2706B/ALD2706, 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 up to only 0.1°C above ambient temperature under
most operating conditions.
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
160
80
120
0
40
SUPPLY CURRENT (µA)
0±1±2±3±4±5±6
T
A
= -55°C
+25°C
+70°C+125°C
INPUTS GROUNDED
OUTPUT UNLOADED
-25°C
OPEN LOOP VOLTAGE GAIN AS AFUNCTION
OF LOAD RESISTANCE
10M
LOAD RESISTANCE (Ω)
10K 100K 1M
1000
100
10
1
OPEN LOOP VOLTAGE
GAIN (V/mV)
V
S
= ±2.5V
T
A
= 25°C
ALD2706A/ALD2706B Advanced Linear Devices 5 of 9
ALD2706
INPUT OFFSET VOLTAGE AS A FUNCTION
OF COMMON MODE INPUT VOLTAGE
COMMON MODE INPUT VOLTAGE (V)
-2 -1 0 +1 +3+2
15
10
5
-5
-10
0
-15
INPUT OFFSET VOLTAGE (mV)
V
S
= ±2.5V
T
A
= 25°C
INPUT OFFSET VOLTAGE AS A FUNCTION
OF AMBIENT TEMPERATURE
REPRESENTATIVE UNITS
AMBIENT TEMPERATURE (°C)
INPUT OFFSET VOLTAGE (mV)
-50 -25 0 +25 +50 +75 +100 +125
+4
+5
+3
+1
+2
0
-2
-1
-4
-3
-5
V
S
= ±2.5V
TYPICAL PERFORMANCE CHARACTERISTICS (cont'd)
OPEN LOOP VOLTAGE GAIN AS
A FUNCTION OF FREQUENCY
FREQUENCY (Hz)
1 10 100 1K 10K 1M 10M100K
120
100
80
60
40
20
0
-20
OPEN LOOP VOLTAGE
GAIN (dB)
VS = ±2.5V
TA = 25°C
90
0
45
180
135
PHASE SHIFT IN DEGREES
LARGE - SIGNAL TRANSIENT
RESPONSE
V
S
= ±1.0V
T
A
= 25°C
R
L
= 100KΩ
C
L
= 25pF
2V/div
500mV/div 10µs/div
LARGE - SIGNAL TRANSIENT
RESPONSE
2V/div 10µs/div
5V/div V
S
= ±2.5V
T
A
= 25°C
R
L
= 100KΩ
C
L
= 25pF
SMALL - SIGNAL TRANSIENT
RESPONSE
100mV/div
50mV/div 10µs/div
V
S
= ±2.5V
T
A
= 25°C
R
L
= 100KΩ
C
L
= 25pF
OPEN LOOP VOLTAGE GAIN AS A FUNCTION
OF SUPPLY VOLTAGE AND TEMPERATURE
SUPPLY VOLTAGE (V)
1000
100
10
1
OPEN LOOP VOLTAGE
GAIN (V/mV)
0 ±2 ±4 ±6 ±8
-55°C ≤ TA ≤ +125°C
RL = 100KΩ
OUTPUT VOLTAGE SWING AS A FUNCTION
OF SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
0±1±2±3±4±7±6±5
±6
±5
±4
±3
±2
±1
OUTPUT VOLTAGE SWING (V)
-55°C ≤ T
A
≤ +125°C
R
L
= 100KΩ
ALD2706A/ALD2706B Advanced Linear Devices 6 of 9
ALD2706
TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER
LOW VOLTAGE INSTRUMENTATION AMPLIFIER
RAIL-TO-RAIL WINDOW COMPARATOR
RAIL-TO-RAIL WAVEFORM
0V
+5V
OUTPUT
0V
+5V
INPUT
-
+OUTPUT
5V
0.1µF
* See Rail to Rail Waveform
0≤ V
IN
≤ 5V
V
IN
Z
IN
= 10
12
Ω
~
1/2 ALD2706
R1
50K
100K
R3
100K
f max = 20KHz
-40mV ≤ V
IN
≤ 40mV
0.1µF
0.1µF
V+
V-
-
+
-
+
R2
100K
100K
-
R4
500K
0.1µF V+
V+ 1M
+
1M V-
V- 0.1µF
V
OUT
1/2 ALD2706
1/2 ALD2706
1/2 ALD2706 V+ = +1.0V
V- = -1.0V
V- ≤ V
OUT
≤ V+
All resistors are 1%.
R1 R3
V
OUT
= V
IN
( 1+ 2R2 ) (R4)
= 25 V
IN
+5V
+
-
+
-
V
IN
100K
V
REF
(HIGH)
V
REF
(LOW)
3
2
5
6
8
4
1
7
1/4 74 C00
1/2 ALD2706
V
OUT
V
OUT (LOW)
FOR V
REF (LOW)
<
V
IN
< V
REF(HIGH)
100K
1/2 ALD2706
HIGH INPUT IMPEDANCE RAIL-TO-RAIL PRECISION
DC SUMMING AMPLIFIER
V- = - 2.5V
10M
10M
10M
10M
10M
10M
R
IN
= 10MΩ Accuracy limited by resistor tolerances and input offset voltage
V+ = +2.5V
-
+
0.1µF
0.1µFV
OUT
V- ≤ V
OUT
≤ V+
V
1
V
4
V
3
V
2
V
OUT
= V
1
+ V
2
- V
3
- V
4
PHOTO DETECTOR CURRENT TO
VOLTAGE CONVERTER
+
-+2.5V
-2.5V
R
F
= 5M
I
PHOTODIODE
V
OUT
= 1 X R
F
R
L
= 100K
1/2 ALD2706
HIGH IMPEDANCE NON-INVERTING AMPLIFIER
+
+1V
-1V
900K
100K
VOUT
VIN
1/2 ALD2706
Performance waveforms.
Upper trace is the output of a
Wien Bridge Oscillator. Lower
trace is the output of Rail-to-Rail
voltage follower.
ALD2706A/ALD2706B Advanced Linear Devices 7 of 9
ALD2706
8 Pin Plastic SOIC Package
SOIC-8 PACKAGE DRAWING
Millimeters Inches
Min Max Min MaxDim
A
A1
b
C
D-8
E
e
H
L
S
1.75
0.25
0.45
0.25
5.00
4.05
6.30
0.937
8°
0.50
0.053
0.004
0.014
0.007
0.185
0.140
0.224
0.024
0°
0.010
0.069
0.010
0.018
0.010
0.196
0.160
0.248
0.037
8°
0.020
1.27 BSC 0.050 BSC
1.35
0.10
0.35
0.18
4.69
3.50
5.70
0.60
0°
0.25
ø
L
C
H
S (45°)
ø
e
A
A1
b
D
S (45°)
E
ALD2706A/ALD2706B Advanced Linear Devices 8 of 9
ALD2706
8 Pin Plastic DIP Package
PDIP-8 PACKAGE DRAWING
b
1
S
b
EE1
D
e
A2
A
1
A
L
ce
1
ø
Millimeters Inches
Min Max Min MaxDim
A
A1
A2
b
b1
c
D-8
E
E1
e
e1
L
S-8
ø
3.81
0.38
1.27
0.89
0.38
0.20
9.40
5.59
7.62
2.29
7.37
2.79
1.02
0°
5.08
1.27
2.03
1.65
0.51
0.30
11.68
7.11
8.26
2.79
7.87
3.81
2.03
15°
0.105
0.015
0.050
0.035
0.015
0.008
0.370
0.220
0.300
0.090
0.290
0.110
0.040
0°
0.200
0.050
0.080
0.065
0.020
0.012
0.460
0.280
0.325
0.110
0.310
0.150
0.080
15°
ALD2706A/ALD2706B Advanced Linear Devices 9 of 9
ALD2706
8 Pin CERDIP Package
CERDIP-8 PACKAGE DRAWING
A
A1
b
b1
C
D-8
E
E1
e
e1
L
L1
L2
S
Ø
3.55
1.27
0.97
0.36
0.20
--
5.59
7.73
3.81
3.18
0.38
--
0°
5.08
2.16
1.65
0.58
0.38
10.29
7.87
8.26
5.08
--
1.78
2.49
15°
Millimeters Inches
Min Max Min MaxDim 0.140
0.050
0.038
0.014
0.008
--
0.220
0.290
0.150
0.125
0.015
--
0°
0.200
0.085
0.065
0.023
0.015
0.405
0.310
0.325
0.200
--
0.070
0.098
15°
2.54 BSC
7.62 BSC
0.100 BSC
0.300 BSC
EE
1
C
e
1
ø
s
b
L
D
b
1
e
A
L
2
A
1
L
1
