ADVANCED
LINEAR
DEVICES, INC.
ALD2706A/ALD2706B
ALD2706
DUAL ULTRA MICROPOWER RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
FEATURES
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.
• 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
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.
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
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)
8-Pin
Plastic Dip
Package
8-Pin
CERDIP
Package
ALD2706ASAL
ALD2706BSAL
ALD2706SAL
ALD2706APAL
ALD2706BPAL
ALD2706PAL
ALD2706ADA
ALD2706BDA
ALD2706DA
OUT A
1
8
V+
-IN A
2
7
OUT B
+IN A
3
6
-IN B
V-
4
5
+IN B
TOP VIEW
SAL, PAL, DA PACKAGES
* Contact factory for leaded (non-RoHS) or high temperature versions.
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
ABSOLUTE MAXIMUM RATINGS
Supply voltage, V+
Differential input voltage range
Power dissipation
Operating temperature range SAL, PAL packages
DA package
Storage temperature range
Lead temperature, 10 seconds
CAUTION: ESD Sensitive Device. Use static control procedures in ESD controlled environment.
10.6V
-0.3V to V+ +0.3V
600 mW
0°C to +70°C
-55°C to +125°C
-65°C to +150°C
+260°C
OPERATING ELECTRICAL CHARACTERISTICS
TA = 25°C VS = ±2.5V unless otherwise specified
Min
2706B
Typ Max
Min
±5.0 ±1.0
10.0 2.0
±5.0
10.0
±1.0
2.0
Symbol
Supply
Voltage
VS
V+
Input Offset
Voltage
VOS
Input Offset
Current
IOS
0.1
20
200
0.1
20
200
Input Bias
Current
IB
0.1
20
200
0.1
20
200
Input Voltage
Range
VIR
Input
Resistance
RIN
Input Offset
Voltage Drift
TCVOS
Min
2706A
Typ
Parameter
±1.0
2.0
Max
2.0
2.8
-0.3
-2.8
5.3
2.8
2706
Typ
Max
Unit
Test
Conditions
±5.0
10.0
V
V
Dual Supply
Single Supply
10.0
11.0
mV
mV
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
0.1
20
200
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
0.1
20
200
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
5.3
2.8
V
V
V+ = +5
VS = ±2.5V
5.0
5.8
-0.3
-2.8
5.3
2.8
-0.3
-2.8
1012
1012
1012
7
7
10
µV/°C
RS ≤ 100KΩ
Ω
Power Supply
Rejection Ratio
PSRR
65
65
80
80
65
65
80
80
60
60
80
80
dB
dB
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
Common Mode
Rejection Ratio
CMRR
65
65
83
83
65
65
83
83
60
60
83
83
dB
dB
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
Large Signal
Voltage Gain
AV
10
100
300
10
100
300
5
80
300
V/mV
V/mV
V/mV
RL = 100KΩ
RL ≥ 1MΩ
RL = 100KΩ
0°C ≤ TA ≤ +70°C
10
Output
Voltage
Range
VO low
VO high
0.001
4.999
0.01
4.99
VO low
VO high
-2.40
2.40
-2.25
2.25
Output Short
Circuit Current
ISC
Supply Current
IS
Power
Dissipation
PD
ALD2706A/ALD2706B
ALD2706
10
50
0.001
4.99 4.999
0.01
V
V
RL = 1MΩ V+ = +5V
0°C ≤ TA ≤ +70°C
-2.40 -2.25
-2.40
2.40
2.25 2.40
-2.25
V
V
RL = 100KΩ
0°C ≤ TA ≤ +70°C
0.001
4.99 4.999
2.25
200
5
0.01
200
80
400
50
200
80
400
Advanced Linear Devices
50
µA
80
400
µA
µW
VIN=0V
No Load
Both amplifiers
VS = ±2.5V
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OPERATING ELECTRICAL CHARACTERISTICS (cont'd)
TA = 25°C VS = ±2.5V unless otherwise specified
Symbol
Min
2706A
Typ
1
1
Bandwidth
BW
200
200
200
KHz
Slew Rate
SR
0.1
0.1
0.1
V/µs
AV = +1
RL = 100KΩ
Rise time
tr
1.0
1.0
1.0
µs
RL = 100KΩ
20
20
20
%
RL = 100KΩ
CL = 25pF
10.0
10.0
10.0
µs
0.1%
AV = -1
CL = 25pF RL = 100KΩ
140
140
140
dB
AV = 100
ts
Channel
Separation
CS
Max
Min
Max
Unit
Test
Conditions
1
Settling
Time
Min
2706
Typ
CIN
Overshoot
Factor
Max
2706B
Typ
Parameter
Input
Capacitance
pF
TA = 25°C VS = ±1.0V unless otherwise specified
Parameter
Symbol
Min
2706A
Typ
Max
Min
2706B
Typ
Max
Min
2706
Typ
Max
Unit
Test
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
AV
50
50
50
V/mV
RL = 1MΩ
Output Voltage
Range
VO low
VO high
V
V
RL = 1MΩ
Bandwidth
BW
0.2
0.2
0.2
MHz
Slew Rate
SR
0.1
0.1
0.1
V/µs
AV =+1
CL = 25pF
Unit
Conditions
RS ≤ 100KΩ
0.9
-0.95
0.95
-0.9
0.9
-.95
0.95
-0.9
0.9
-0.95
0.95
-0.9
VS = ± 2.5V -55°C ≤ TA ≤ +125°C unless otherwise specified
2706ADA
Typ
Max
Min
VOS
3.0
6.0
12.0
mV
Input Offset
Current
IOS
4.0
4.0
4.0
nA
Input Bias
Current
IB
4.0
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
AV
10
50
10
50
5
50
V/mV
RL = 1MΩ
Output Voltage
Range
VO low
VO high
2.25
-2.40
2.40
-2.40 -2.25
2.40
2.25
-2.40
2.40
V
V
RL = 1MΩ
2.25
Max
Min
Advanced Linear Devices
Typ
Test
Input Offset
Voltage
-2.25
Typ
2706DA
Symbol
ALD2706A/ALD2706B
ALD2706
Min
2706BDA
Parameter
Max
-2.25
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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 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 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.
TYPICAL PERFORMANCE CHARACTERISTICS
COMMON MODE INPUT VOLTAGE RANGE
AS A FUNCTION OF SUPPLY VOLTAGE
±7
INPUTS GROUNDED
OUTPUT UNLOADED
+25°C
160
COMMON MODE INPUT
VOLTAGE RANGE (V)
SUPPLY CURRENT (µA)
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
-25°C
TA = -55°C
120
80
40
+125°C
+70°C
0
±6
TA = 25°C
±5
±4
±3
±2
±1
0
0
±1
±2
±3
±4
±5
±6
0
±1
SUPPLY VOLTAGE (V)
±5
±6
±7
10000
INPUT BIAS CURRENT (pA)
OPEN LOOP VOLTAGE
GAIN (V/mV)
±4
INPUT BIAS CURRENT AS A FUNCTION
OF AMBIENT TEMPERATURE
1000
100
10
VS = ±2.5V
TA = 25°C
VS = ±2.5V
1000
100
10
1.0
0.1
100K
1M
10M
LOAD RESISTANCE (Ω)
ALD2706A/ALD2706B
ALD2706
±3
SUPPLY VOLTAGE (V)
OPEN LOOP VOLTAGE GAIN AS AFUNCTION
OF LOAD RESISTANCE
1
10K
±2
-50
-25
0
25
50
75
100
125
AMBIENT TEMPERATURE (°C)
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4 of 9
TYPICAL PERFORMANCE CHARACTERISTICS (cont'd)
OUTPUT VOLTAGE SWING AS A FUNCTION
OF SUPPLY VOLTAGE
OPEN LOOP VOLTAGE GAIN AS A FUNCTION
OF SUPPLY VOLTAGE AND TEMPERATURE
OUTPUT VOLTAGE SWING (V)
OPEN LOOP VOLTAGE
GAIN (V/mV)
1000
100
10
-55°C ≤ TA ≤ +125°C
RL = 100KΩ
±6
-55°C ≤ TA ≤ +125°C
RL = 100KΩ
±5
±4
±3
±2
±1
1
0
±2
±4
±6
0
±8
±1
±2
±4
±5
±6
±7
OPEN LOOP VOLTAGE GAIN AS
A FUNCTION OF FREQUENCY
120
+5
+4
OPEN LOOP VOLTAGE
GAIN (dB)
VS = ±2.5V
+3
+2
+1
0
-1
-2
-3
-4
VS = ±2.5V
TA = 25°C
100
80
60
0
40
45
20
90
0
135
180
-20
-5
-50
-25
0
+25
+50
+75
+100 +125
1
10
AMBIENT TEMPERATURE (°C)
INPUT OFFSET VOLTAGE AS A FUNCTION
OF COMMON MODE INPUT VOLTAGE
100
1K
10K 100K
FREQUENCY (Hz)
1M
PHASE SHIFT IN DEGREES
INPUT OFFSET VOLTAGE (mV)
INPUT OFFSET VOLTAGE AS A FUNCTION
OF AMBIENT TEMPERATURE
REPRESENTATIVE UNITS
INPUT OFFSET VOLTAGE (mV)
±3
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
10M
LARGE - SIGNAL TRANSIENT
RESPONSE
15
VS = ±2.5V
TA = 25°C
10
2V/div
VS = ±1.0V
TA = 25°C
RL = 100KΩ
CL= 25pF
500mV/div
10µs/div
5
0
-5
-10
-15
-2
-1
0
+1
+2
+3
COMMON MODE INPUT VOLTAGE (V)
LARGE - SIGNAL TRANSIENT
RESPONSE
5V/div
2V/div
ALD2706A/ALD2706B
ALD2706
SMALL - SIGNAL TRANSIENT
RESPONSE
VS = ±2.5V
TA = 25°C
RL = 100KΩ
CL= 25pF
100mV/div
10µs/div
50mV/div
Advanced Linear Devices
VS = ±2.5V
TA = 25°C
RL = 100KΩ
CL= 25pF
10µs/div
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TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER
RAIL-TO-RAIL WAVEFORM
INPUT
5V
~ 1012Ω
ZIN =
+5V
0V
0.1µF
-
+5V
OUTPUT
0V
OUTPUT
+
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.
0≤ VIN ≤ 5V
* See Rail to Rail Waveform
RAIL-TO-RAIL WINDOW COMPARATOR
HIGH INPUT IMPEDANCE RAIL-TO-RAIL PRECISION
DC SUMMING AMPLIFIER
+5V
1/2 ALD2706
8
V+ = +2.5V
V1
100K
VREF (HIGH) 3
+
1
10M
+
0.1µF
V2
10M
10M
10M
2
-
VOUT
VIN
VOUT
1/4 74 C00
5
0.1µF
+
7
V3
V4
100K
V- ≤ VOUT ≤ V+
V- = - 2.5V
10M
VREF (LOW) 6
-
4
VOUT = V1 + V2 - V3 - V4
RIN = 10MΩ Accuracy limited by resistor tolerances and input offset voltage
VOUT (LOW) FOR VREF (LOW) < VIN < VREF(HIGH)
PHOTO DETECTOR CURRENT TO
VOLTAGE CONVERTER
HIGH IMPEDANCE NON-INVERTING AMPLIFIER
900K
100K
RF = 5M
+1V
I
PHOTODIODE
1/2 ALD2706
10M
-
+2.5V
VOUT = 1 X RF
VOUT
+
-2.5V
VIN
RL = 100K
+
-1V
1/2 ALD2706
1/2 ALD2706
LOW VOLTAGE INSTRUMENTATION AMPLIFIER
1/2 ALD2706
V+
0.1µF
R3
100K
+
-
R4
500K
100K
V-
V+
0.1µF
0.1µF
R1
50K
f max = 20KHz
-40mV ≤ VIN ≤ 40mV
+
VOUT
V+ 1M
1/2 ALD2706
R2
100K
-
V-
0.1µF
V-
100K
+
1/2 ALD2706
ALD2706A/ALD2706B
ALD2706
V+ = +1.0V
V- = -1.0V
V- ≤ VOUT ≤ V+
All resistors are 1%.
Advanced Linear Devices
1M
VOUT = VIN ( 1+ 2R2 ) (R4)
R1 R3
= 25 VIN
6 of 9
SOIC-8 PACKAGE DRAWING
8 Pin Plastic SOIC Package
E
Millimeters
Dim
S (45°)
D
A
Min
1.35
Max
1.75
Min
0.053
Max
0.069
A1
0.10
0.25
0.004
0.010
b
0.35
0.45
0.014
0.018
C
0.18
0.25
0.007
0.010
D-8
4.69
5.00
0.185
0.196
E
3.50
4.05
0.140
0.160
1.27 BSC
e
A
A1
e
Inches
0.050 BSC
H
5.70
6.30
0.224
0.248
L
0.60
0.937
0.024
0.037
ø
0°
8°
0°
8°
S
0.25
0.50
0.010
0.020
b
S (45°)
H
L
ALD2706A/ALD2706B
ALD2706
C
ø
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7 of 9
PDIP-8 PACKAGE DRAWING
8 Pin Plastic DIP Package
Millimeters
E
E1
D
S
A2
A1
e
b
A
L
Dim
Min
Max
Min
Max
A
3.81
5.08
0.105
0.200
A1
0.38
1.27
0.015
0.050
A2
1.27
2.03
0.050
0.080
b
0.89
1.65
0.035
0.065
b1
0.38
0.51
0.015
0.020
c
0.20
0.30
0.008
0.012
D-8
9.40
11.68
0.370
0.460
E
5.59
7.11
0.220
0.280
E1
7.62
8.26
0.300
0.325
e
2.29
2.79
0.090
0.110
e1
7.37
7.87
0.290
0.310
L
2.79
3.81
0.110
0.150
S-8
1.02
2.03
0.040
0.080
0°
15°
0°
15°
ø
b1
Inches
c
e1
ALD2706A/ALD2706B
ALD2706
ø
Advanced Linear Devices
8 of 9
CERDIP-8 PACKAGE DRAWING
8 Pin CERDIP Package
E E1
Millimeters
D
A1
s
A
L
L2
b
b1
e
L1
Inches
Dim
A
Min
Max
3.55
5.08
Min
0.140
Max
0.200
A1
1.27
2.16
0.050
0.085
b
0.97
1.65
0.038
0.065
b1
0.36
0.58
0.014
0.023
C
0.20
0.38
0.008
0.015
D-8
--
10.29
--
0.405
E
5.59
7.87
0.220
0.310
E1
7.73
8.26
0.290
0.325
e
2.54 BSC
0.100 BSC
e1
7.62 BSC
0.300 BSC
L
3.81
5.08
0.150
0.200
L1
3.18
--
0.125
--
L2
0.38
1.78
0.015
0.070
S
--
2.49
--
0.098
Ø
0°
15°
0°
15°
C
e1
ALD2706A/ALD2706B
ALD2706
ø
Advanced Linear Devices
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