ALD ALD2731PAL Precision dual micropower cmos operational amplifier Datasheet

e
ADVANCED
LINEAR
DEVICES, INC.
TM
EPAD
EN
®
AB
LE
D
ALD2731A/ALD2731
PRECISION DUAL MICROPOWER CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
FEATURES & BENEFITS
The ALD2731A/ALD2731 is a precision dual low-cost high-slew-rate
monolithic CMOS micropower 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 per amplifier maximum at 5V supply
voltage. It is manufactured with Advanced Linear Devices' enhanced
EPAD® silicon gate CMOS process.
• Two package versions -- lead-free (RoHS
compliant) and legacy leaded (tin-lead)
• Extremely low input offset voltages -0.6mV 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
• Ideal for high source impedance applications
• Dual power supplies ±1.0V to ±5.0V
• Single power supply +2.0V to +10.0V
• High voltage gain -- typ. 100V/mV @ ±2.5V
• Drive as low as 10KΩ load
• Output short circuit protected
• Unity gain bandwidth of 0.7MHz
• Slew rate of 0.7V/µs
• Micropower symmetrical complementary
output drive
• Suitable for rugged, temperature-extreme
environments
The ALD2731A/ALD2731 features extremely low input power requirements, practically removing any leading effects on high source impedance signal sources such as cpacitive sensors. These devices do not add
any significant errors, regardless of what the souce impedance variations
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
input offset voltages. 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 of µA741 and ICL7611 types.
Several additional 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 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.
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
temperature drift, make the ALD2731A/ALD2731 a versatile, micropower
operational amplifier.
The ALD2731A/ALD2731, designed and fabricated with silicon gate
CMOS technology, offers 0.01pA typical input bias current. On chip offset
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.
ORDERING INFORMATION (“L” suffix denotes lead-free (RoHS))
0°C to +70°C
Operating Temperature Range
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
ALD2731ASAL
ALD2731SAL
ALD2731ASA
ALD2731SA
ALD2731APAL
ALD2731PAL
ALD2731APA
ALD2731PA
ALD2731ADA
ALD2731DA
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
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, SA, PA, DA PACKAGES
* 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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ABSOLUTE MAXIMUM RATINGS
Supply voltage, V+
Differential input voltage range
Power dissipation
Operating temperature range SAL, PAL, SA, PA 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
600mW
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
Parameter
Symbol
Min
ALD2731A
Typ
Max
Min
ALD2731
Typ
Supply Voltage
VS
V+
Input Offset Voltage
VOS
0.6
1.0
1.0
Input Offset Current
IOS
0.01
10
200
Input Bias Current
IB
0.01
10
200
Input Voltage Range
VIR
Input Resistance
RIN
Input Offset Voltage Drift
TCVOS
Power Supply
Rejection Ratio
±1.0
2.0
±5.0
10.0
-0.3
-2.8
+5.3
+2.8
2.0
mV
RS ≤ 100KΩ
0.01
10
200
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
0.01
10
200
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
+5.3
+2.8
V
V
V+ = +5V
VS = ±2.5V
-0.3
-2.8
5
5
PSRR
85
85
Common Mode
Rejection Ratio
CMRR
Large Signal
Voltage Gain
AV
Output Voltage Range
VO low
VO high
VO high
2.40
Ω
µV/°C
RS ≤ 100KΩ
85
85
dB
dB
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
85
85
85
85
dB
dB
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
100
300
100
300
V/mV
V/mV
RL = 100KΩ
RL = 1MΩ
V
V
RL = 1MΩ, V+ = +5V
0°C ≤ TA ≤ +70°C
V
RL =100KΩ
0°C ≤ TA ≤ +70°C
0.001
4.999
0.01
-2.48
-2.40
4.99
2.48
2.40
0.001
4.999
0.01
-2.48
-2.40
2.48
V
Output Short
Circuit Current
ISC
Supply Current
IS
Power Dissipation
PD
Input Capacitance
CIN
1
1
Bandwidth
BW
700
700
KHz
Slew Rate
SR
0.7
0.7
V/µs
ALD2731A/ALD2731
Test
Conditions
Dual Supply
Single Supply
±5.0
10.0
1014
VO low
Unit
V
V
±1.0
2.0
1014
4.99
Max
1
240
1
360
240
1.8
Advanced Linear Devices
mA
360
µA
VIN = 0V, No Load
1.8
mW
VS = ±2.5V
pF
AV = +1, RL =100KΩ
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OPERATING ELECTRICAL CHARACTERISTICS (cont'd)
TA = 25°C VS = ±2.5V unless otherwise specified (cont'd)
ALD2731A
Parameter
Symbol
Rise time
tr
Min
Overshoot Factor
Settling Time
ts
ALD2731
Typ
Max
Min
Typ
Max
Unit
Test Conditions
0.2
0.2
µs
RL = 100KΩ
20
20
%
RL = 100KΩ,
CL = 50pF
10
10
µs
0.1%, AV = 100,
RL = 100KΩ,
CL = 50pF
Channel Separation
cs
140
140
dB
AV = 100
Unit
Test Conditions
TA = 25°C VS = ±5.0V unless otherwise specified
ALD2731A
Min
Symbol
Power Supply Rejection Ratio
PSRR
90
90
dB
RS ≤ 100KΩ
Common Mode Rejection Ratio
CMRR
90
90
dB
RS ≤ 100KΩ
Large Signal Voltage Gain
AV
250
250
V/mV
RL = 100KΩ
Output Voltage Range
VO low
VO high
V
RL = 100KΩ
4.90
Typ
ALD2731
Parameter
Max
-4.98
4.98
Min
-4.90
4.90
Typ
-4.98
4.98
Max
-4.90
Bandwidth
BW
1.0
1.0
MHz
Slew Rate
SR
1.0
1.0
V/µs
AV = +1, CL = 50pF
Max
Unit
Test Conditions
RS ≤ 100KΩ
VS = ±2.5V -55°C ≤ TA ≤ +125°C unless otherwise specified
ALD2731A
Symbol
Input Offset Voltage
VOS
2.0
3.0
mV
Input Offset Current
IOS
2.0
2.0
nA
Input Bias Current
IB
2.0
2.0
nA
Power Supply Rejection Ratio
PSRR
75
75
dB
RS ≤ 100KΩ
Common Mode Rejection Ratio
CMRR
83
83
dB
RS ≤ 100KΩ
Large Signal Voltage Gain
AV
50
50
V/mV
RL = 100KΩ
Output Voltage Range
VO low
VO high
V
V
RL = 100KΩ
ALD2731A/ALD2731
Min
2.35
Typ
ALD2731
Parameter
-2.47
2.45
Max
Min
-2.40
2.35
Advanced Linear Devices
Typ
-2.47
2.45
-2.40
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Design & Operating Notes:
1. The ALD2731A/ALD2731 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 ALD2731A/ALD2731 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 ALD2731A/ALD2731 has complementary p-channel and nchannel input differential stages connected in parallel to accomplish
rail to rail common mode input voltage ranges. 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 ALD2731A/
ALD2731 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 below 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 provisions in the 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 0.01pA 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 14Ω
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 ALD2731A/ALD2731 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 not to exceed 0.3V of the power
supply voltage levels.
6. The ALD2731A/ALD2731, 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.
7. The ALD2731A/ALD2731 has an internal design architecture that
provides robust high temperature operation. Contact factory for
custom screening versions.
TYPICAL PERFORMANCE CHARACTERISTICS
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
±6
INPUTS GROUNDED
OUTPUT UNLOADED
+25°C
COMMON MODE INPUT
VOLTAGE RANGE (V)
SUPPLY CURRENT (µA)
500
COMMON MODE INPUT VOLTAGE RANGE
AS A FUNCTION OF SUPPLY VOLTAGE
400
-25°C
300
TA = -55°C
200
+125°C
100
+70°C
TA = 25°C
±4
±3
±2
±1
0
0
0
±1
±2
±3
±4
±5
0
±6
±1
±2
±3
±4
±5
±6
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
OPEN LOOP VOLTAGE GAIN AS A
FUNCTION OF LOAD RESISTANCE
INPUT BIAS CURRENT AS A FUNCTION
OF AMBIENT TEMPERATURE
1000
INPUT BIAS CURRENT (pA)
1000
OPEN LOOP VOLTAGE
GAIN (V/mV)
±5
100
10
VS = ±2.5V
TA = 25°C
100
VS = ±2.5V
10
1.0
0.1
0.01
1
10K
100K
1M
10M
ALD2731A/ALD2731
-50
-25
0
+25
+50
+75
+100
+125
AMBIENT TEMPERATURE (°C)
LOAD RESISTANCE (Ω)
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TYPICAL PERFORMANCE CHARACTERISTICS (cont'd)
OPEN LOOP VOLTAGE GAIN AS A FUNCTION
OF SUPPLY VOLTAGE AND TEMPERATURE
OUTPUT VOLTAGE SWING AS A
FUNCTION OF SUPPLY VOLTAGE
±6
OUTPUT VOLTAGE SWING (V)
OPEN LOOP VOLTAGE
GAIN (V/mV)
1000
100
10
-55°C ≤ TA ≤ +125°C
RL = 100KΩ
-55°C ≤ TA ≤ +125°C
RL = 100KΩ
±5
±4
±3
±2
±1
1
0
±1
±2
±3
±4
±5
0
±6
±1
±2
±3
±4
±5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
OPEN LOOP VOLTAGE GAIN AS A
FUNCTION OF FREQUENCY
LARGE-SIGNAL TRANSIENT
RESPONSE
±6
5V/div
100
VS = ±2.5V
TA = 25°C
80
60
0
40
45
20
90
0
135
-20
180
1
10
100
1K
10K
100K
1M
PHASE SHIFT IN DEGREES
OPEN LOOP VOLTAGE
GAIN (dB)
120
2V/div
VS = ±2.5V
TA = 25°C
RL = 100KΩ
CL = 50pF
5µs/div
10M
FREQUENCY (Hz)
LARGE-SIGNAL TRANSIENT
RESPONSE
2V/div
500mV/div
ALD2731A/ALD2731
VS = ±1.0V
TA = 25°C
RL = 100KΩ
CL = 50pF
5µs/div
Advanced Linear Devices
SMALL-SIGNAL TRANSIENT
RESPONSE
100mV/div
20mV/div
VS = ±2.5V
TA = 25°C
RL = 100KΩ
CL = 50pF
2µs/div
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TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER
PHOTO DETECTOR CURRENT TO
VOLTAGE CONVERTER
RF = 5M
5V
~ 1012Ω
ZIN =
0.1µF
I
OUTPUT
+
VIN
1/2 ALD2731
0≤ VIN ≤ 5V
1/2 ALD2731
RAIL-TO-RAIL WAVEFORM
V+ = +2.5V
V2
-2.5V
* See Rail to Rail Waveform
INPUT
10M
+
10M
10M
10M
0.1µF
1/2 ALD2731
-
+5V
0V
+5V
OUTPUT
0V
VOUT
0.1µF
V3
VOUT = 1 X RF
RL = 100K
+
HIGH INPUT IMPEDANCE RAIL-TO-RAIL
PRECISION DC SUMMING AMPLIFIER
V1
+2.5V
-
PHOTODIODE
V- ≤ VIN ≤ V+
V4
10M
Performance waveforms.
Upper trace is the output of a
Wien Bridge Oscillator. Lower
trace is the output of Rail-to-rail
voltage follower.
V- ≤ VOUT ≤ V+
V- = - 2.5V
10M
VOUT = V1 + V2 - V3 - V4
RIN = 10MΩ Accuracy limited by resistor tolerances and input offset voltage
WIEN BRIDGE OSCILLATOR (RAIL-TO-RAIL)
SINE WAVE GENERATOR
RAIL-TO-RAIL WINDOW COMPARATOR
+5V
-
8
+2.5V
100K
VREF (HIGH) 3
1
VOUT
1/2 ALD2731
+
2
10K
-2.5V
.01µF
5
10K
100K
~
f=
-
+
7
10K
R = 10K
1/4 74 C00
VOUT
VIN
C = .01µF
1/2 ALD2731
+
VREF (LOW)
6 -
4
~ 1.6KHZ
1
=
2πRC
1/2 ALD2731
VOUT (LOW) FOR VREF (LOW) < VIN < VREF(HIGH)
* See Rail to Rail Waveform
LOW VOLTAGE INSTRUMENTATION AMPLIFIER
V+
0.1µF
1M
+
100K
-
500K
100K
V-
1/2 ALD2731
f max = 20KHz
-40mV ≤ VIN ≤ 40mV
V+
V+
0.1µF
0.1µF
+
50K
V+ 1M
0.1µF
100K
1M
100K
VOUT
V-
0.1µF
ALD1731
V-
1M
+
V-
0.1µF
1/2 ALD2731
ALD2731A/ALD2731
GAIN = 25 V- ≤ VOUT ≤ V+ All resistors are 1%
V+ = +1.0V V- = -1.0V Short Circuit Input Current 1µA
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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
ALD2731A/ALD2731
C
ø
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PDIP-8 PACKAGE DRAWING
8 Pin Plastic DIP Package
E
E1
Millimeters
D
S
A2
A1
e
b
b1
A
L
Inches
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
L
7.37
7.87
0.290
0.310
2.79
3.81
0.110
0.150
S-8
1.02
2.03
0.040
0.080
0°
15°
0°
15°
ø
c
e1
ALD2731A/ALD2731
ø
Advanced Linear Devices
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CERDIP-8 PACKAGE DRAWING
8 Pin CERDIP Package
E E1
Millimeters
D
A1
s
A
L
L2
b
b1
e
L1
Min
Inches
Dim
A
3.55
Max
5.08
0.140
Min
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
ALD2731A/ALD2731
ø
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