A
DVANCED
L
INEAR
D
EVICES,
I
NC.
ALD2702A/ALD2702B
ALD2702
DUAL 5V RAIL-TO-RAIL PRECISION OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
The ALD2702A/ALD2702B/ALD2702 is a dual monolithic operational
amplifier intended primarily for a wide range of analog applications in +5V
single power supply and
±5V
dual power supply systems as well as +4V
to +10V battery operated systems. All device characteristics are specified
for +5V single supply or
±2.5V
dual supply systems. The device has an
input stage that operates to +300mV above and -300mV below the supply
voltages with no adverse effects and/or phase reversals. It offers popular
industry pin configuration.
The ALD2702A/ALD2702B/ALD2702 has been developed specifically
with the +5V single supply or
±2.5V
dual supply user in mind. Several
important characteristics of the device make many applications easy to
implement for these supply voltages. First, the operational amplifier can
operate with rail to rail input and output voltages. This feature allows
numerous analog serial stages to be implemented without losing operating
voltage margin. Second, the device was designed to accommodate
mixed applications where digital and analog circuits may work off the
same 5V power supply. Third, the output stage can drive up to 400pF
capacitive and 5KΩ resistive loads in non-inverting unity gain connection
and double the capacitance in the inverting unity gain mode.
These features, coupled with extremely low input currents, high voltage
gain, useful bandwidth of 1.5MHz, a slew rate of 1.9V/µs, low power
dissipation, low offset voltage and temperature drift, make the ALD2702A/
ALD2702B/ALD2702 a truly versatile, user friendly, operational amplifier.
The ALD2702A/ALD2702B/ALD2702 is designed and fabricated with
silicon gate CMOS technology, and offers less than 1pA typical input bias
current. On-chip offset voltage trimming allows the device to be used
without nulling in most applications. The device offers typical offset drift
of less than 7µV/°C which eliminates many trim or temperature
compensation circuits. For precision applications, the ALD2702A/
ALD2702B/ALD2702 is designed to settle to 0.01% in 8µs. Additionally,
robust design and rigorous screening make this device especially suitable
for operation in temperature-extreme environments and rugged conditions.
FEATURES
• Rail-to-rail input and output voltage ranges
• Symmetrical push-pull class AB output
drivers
• All parameters specified for +5V single
supply or
±2.5V
dual supply systems
• High load capacitance capability -- drives
up to 4000pF typical
• No frequency compensation required --
unity gain stable
• Extremely low input bias currents --
<1.0pA typical
• Ideal for high source impedance applications
• Dual power supply
±2.5V
to
±5V
operation
• Single power supply +5V to +10V operation
• High voltage gain -- typically 85V/mV
@
±2.5V
and 250V/mV @
±5.0V
• Drive as low as 2KΩ load with 5mA
drive current
• Output short circuit protected
• Unity gain bandwidth of 1.5MHz
• Slew rate of 1.9V/µs
• Low power dissipation
• Suitable for rugged, temperature-extreme
environments
APPLICATIONS
•
•
•
•
•
•
•
•
•
•
•
•
•
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
Coaxial cable driver
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)
ALD2702ASAL
ALD2702BSAL
ALD2702SAL
8-Pin
Plastic Dip
Package
ALD2702APAL
ALD2702BPAL
ALD2702PAL
8-Pin
CERDIP
Package
ALD2702ADA
ALD2702BDA
ALD2702DA
PIN CONFIGURATION
V+
OUT
B
-IN
B
+IN
B
OUT
A
-IN
A
+IN
A
V-
1
2
3
4
TOP VIEW
SAL, PAL, DA PACKAGES
8
7
6
5
* 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
+
referenced to V
-
Supply voltage, V
S
referenced to V
-
Differential input voltage range
Power dissipation
Operating tempurature range SAL, PAL packages
DA package
Storage tempurature range
Lead tempurature, 10 seconds
CAUTION:
ESD Sensitive Device. Use static control procedures in ESD controlled environment.
-0.3V to V++10.6V
±5.3V
-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
T
A
= 25
°
C V
S
=
±
2.5V unless otherwise specified
Parameter
Supply
Voltage
Input Offset
Voltage
Input Offset
Current
Input Bias
Current
Input Voltage
Range
Input
Resistance
Input Offset
Voltage Drift
Power Supply
Rejection Ratio
Common Mode
Rejection Ratio
Large Signal
Voltage Gain
Output
Voltage
Range
Symbol
V
S
V
+
V
OS
I
OS
I
B
V
IR
R
IN
TCV
OS
PSRR
65
65
65
65
15
-0.3
-2.8
10
12
1.0
1.0
2702A
Min Typ
±2.0
4.0
Max
±5.0
10.0
1.0
1.5
20
240
20
300
5.3
+2.8
-0.3
-2.8
10
12
1.0
1.0
2702B
Min Typ Max
±2.0
4.0
2702
Min Typ
Max
±5.0
10.0
5.0
6.0
1.0
1.0
-0.3
-2.8
10
12
20
240
20
300
5.3
+2.8
Unit
V
V
mV
mV
pA
pA
pA
pA
V
V
Ω
Test
Conditions
Dual Supply
Single Supply
R
S
≤
100KΩ
0°C
≤
T
A
≤
+70°C
T
A
= 25°C
0°C
≤
T
A
≤
+70°C
T
A
= 25°C
0°C
≤
T
A
≤
+70°C
V
+
= +5V
V
S
=
±2.5V
±5.0 ±2.0
10.0 4.0
2.0
3.0
20
240
20
300
5.3
+2.8
7
83
83
83
83
28
100
0.002
4.998
-2.44
2.44
8
0.01
4.99
-2.40
2.40
65
65
65
65
15
7
83
83
83
83
28
100
63
63
63
63
12
7
83
83
83
83
28
100
0.002
4.998
-2.44
2.44
8
0.01
µV/°C
dB
R
S
≤
100KΩ
R
S
≤
100KΩ
0°C
≤
T
A
≤
+70°C
R
S
≤
100KΩ
0°C
≤
T
A
≤
+70°C
R
L
= 10KΩ
R
L
≥
1MΩ
R
L
= 1MΩ Single supply
0°C
≤
T
A
≤
+70°C
R
L
= 10KΩ Dual supply
0°C
≤
T
A
≤
+70°C
CMRR
dB
A
V
V/mV
V/mV
V
O
low
V
O
high
V
O
low
V
O
high
4.99
2.40
0.002 0.01
4.998
4.99
-2.44 -2.40
2.44
2.40
8
V
-2.40
V
V
mA
Output Short
Circuit Current
Supply
Current
Power
Dissipation
Input
Capacitance
Bandwidth
Slew Rate
Rise time
Overshoot
Factor
I
SC
I
S
P
D
2.0
3.0
2.0
3.0
2.0
3.0
mA
V
IN
= 0V No Load
Both amplifiers
V
S
=
±2.5V
10
15.0
10
15.0
10
15.0
mW
C
IN
1
1
1
pF
B
W
S
R
t
r
0.7
1.1
1.5
1.9
0.2
10
0.7
1.1
1.5
1.9
0.2
10
0.7
1.1
1.5
1.9
0.2
10
MHz
V/µs
µs
%
A
V
= +1 R
L
= 10KΩ
R
L
= 10KΩ
R
L
= 10KΩ C
L
= 100pF
ALD2702A/ALD2702B
ALD2702
Advanced Linear Devices
2 of 9
OPERATING ELECTRICAL CHARACTERISTICS (cont'd)
T
A
= 25
°
C V
S
=
±
2.5V unless otherwise specified
Parameter
Maximum Load
Capacitance
Symbol
C
L
2702A
Min
Typ
400
4000
Max
2702B
Min Typ
400
4000
Max
Min
2702
Typ
400
4000
Max
Unit
pF
pF
Test Conditions
Gain = 1
Gain = 5
Input Noise
Voltage
e
n
26
26
26
nV/√H
Z
f = 1KH
Z
Input Current
Noise
i
n
0.6
0.6
0.6
fA/√H
Z
f = 10H
Z
Settling
Time
t
s
8.0
3.0
8.0
3.0
8.0
3.0
µs
µs
0.01%
0.1% A
V
= -1
R
L
= 5KΩ C
L
= 50pF
T
A
= 25
°
C V
S
=
±
5.0V unless otherwise specified
2702A
Parameter
Power Supply
Rejection Ratio
Common Mode
Rejection Ratio
Large Signal
Voltage Gain
Output Voltage
Range
Bandwidth
Slew Rate
Symbol
PSRR
Min
Typ
83
Max
Min
2702B
Typ
83
Max
Min
2702
Typ
83
Max
Unit
dB
Test Conditions
R
S
≤
100KΩ
CMRR
83
83
83
dB
R
S
≤
100KΩ
A
V
V
O
low
V
O
high
B
W
S
R
250
250
250
V/mV
R
L
= 10KΩ
R
L
= 10KΩ
4.8
-4.90
4.93
1.7
2.8
-4.8
4.8
-4.90
4.93
1.7
2.8
-4.8
4.8
-4.90
4.93
1.7
2.8
-4.8
V
MH
Z
V/µs
A
V
=+1
C
L
=50pF
V
S
= +5.0V -55
°
C
≤
T
A
≤
+125
°
C unless otherwise specified
Parameter
Input Offset
Voltage
Input Offset
Current
Input Bias
Current
Power Supply
Rejection Ratio
Common Mode
Rejection Ratio
Large Signal
Voltage Gain
Output Voltage
Range
Symbol
V
OS
I
OS
I
B
PSRR
CMRR
A
V
V
O
low
V
O
high
60
60
10
75
83
25
0.1
4.9
0.2
4.8
2702ADA
Min
Typ Max
2.0
8.0
10.0
60
60
10
75
83
25
0.1
4.9
0.2
4.8
2702BDA
Min Typ Max
4.0
8.0
10.0
60
60
7
75
83
25
0.1
4.9
0.2
Min
2702DA
Typ
Max
7.0
8.0
10.0
Unit
mV
nA
nA
dB
dB
V/mV
V
R
S
≤
100KΩ
R
S
≤
100KΩ
R
L
≤
10KΩ
R
L
≤
10KΩ
Test Conditions
R
S
≤
100KΩ
4.8
ALD2702A/ALD2702B
ALD2702
Advanced Linear Devices
3 of 9
Design & Operating Notes:
1. The ALD2702A/ALD2702B/ALD2702 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. The ALD2702A/
ALD2702B/ALD2702 is internally compensated for unity gain
stability using a novel scheme. This design 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.
A unity gain buffer using the ALD2702A/ALD2702B/ALD2702 will
typically drive 400pF of external load capacitance without stability
problems. In the inverting unity gain configuration, it can drive up
to 800pF of load capacitance. Compared to other CMOS
operational amplifiers, the ALD2702A/ALD2702B/ALD2702 has
shown itself to be more resistant to parasitic oscillations.
2. The ALD2702A/ALD2702B/ALD2702 has complementary p-channel
and n-channel input differential stages connected in parallel to
accomplish rail-to-rail input common mode voltage range. With the
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 above the negative supply voltage.
As offset voltage trimming on the ALD2702A/ALD2702B/ALD2702
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
greater than 2.5 (5V operation), where the common mode voltage
does not make excursions below this switching point.
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. 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 the ALD2702A/ALD2702B/ALD2702 an effective analog signal
buffer for medium to high source impedance sensors, transducers,
and other circuit networks.
5. The ALD2702A/ALD2702B/ALD2702 operational amplifier has been
designed with 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.
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. Alternatively, a 100KΩ or higher value resistor at the input
terminals will limit input currents to acceptable levels while causing
very small or negligible accuracy effects.
TYPICAL PERFORMANCE CHARACTERISTICS
COMMON MODE INPUT VOLTAGE RANGE
AS A FUNCTION OF SUPPLY VOLTAGE
±7
COMMON MODE INPUT
VOLTAGE RANGE (V)
OPEN LOOP VOLTAGE GAIN AS A FUNCTION
OF SUPPLY VOLTAGE AND TEMPERATURE
1000
±5
±4
±3
±2
±1
0
0
±1
±2
±3
±4
±5
±6
±7
OPEN LOOP VOLTAGE
GAIN (V/mV)
±6
T
A
= 25°C
}
-55°C
}
+25°C
100
}
+125°C
10
R
L
= 10KΩ
R
L
= 5KΩ
1
0
±2
±4
SUPPLY VOLTAGE (V)
±6
±8
SUPPLY VOLTAGE (V)
INPUT BIAS CURRENT AS A FUNCTION
OF AMBIENT TEMPERATURE
10000
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
6
SUPPLY CURRENT (mA)
INPUT BIAS CURRENT (pA)
1000
100
V
S
=
±
2.5V
5
4
INPUTS GROUNDED
OUTPUTS UNLOADED
T
A
= -55°C
3
2
1
0
10
-25°C
+25°C
+80°C
+125°C
1.0
0.1
-50
-25
0
25
50
75
100
125
±1
±2
±3
±4
±5
±6
AMBIENT TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
ALD2702A/ALD2702B
ALD2702
Advanced Linear Devices
4 of 9
TYPICAL PERFORMANCE CHARACTERISTICS (cont'd)
OUTPUT VOLTAGE SWING AS A
FUNCTION OF SUPPLY VOLTAGE
±7
120
OPEN LOOP VOLTAGE GAIN AS
A FUNCTION OF FREQUENCY
100
80
60
40
20
0
-20
0
45
90
135
180
1
10
100
1K
10K
100K
1M
10M
V
S
=
±2.5V
T
A
= 25°C
OUTPUT VOLTAGE SWING (V)
±6
±5
±4
±3
±2
0
RL = 10KΩ
R
L
= 10KΩ
R
L
= 2KΩ
±1
±2
±3
±4
±5
±6
±7
OPEN LOOP VOLTAGE
GAIN (dB)
-55°C
≤
T
A
≤
125°C
PHASE SHIFT IN DEGREES
SUPPLY VOLTAGE (V)
FREQUENCY (Hz)
INPUT OFFSET VOLTAGE AS A FUNCTION
OF AMBIENT TEMPERATURE
REPRESENTATIVE UNITS
INPUT OFFSET VOLTAGE (mV)
+5
+4
+3
+2
+1
0
-1
-2
-3
-4
-5
-50
-25
0
+25
+50
+75
+100 +125
INPUT OFFSET VOLTAGE AS A FUNCTION
OF COMMON MODE INPUT VOLTAGE
15
INPUT OFFSET VOLTAGE (mV)
V
S
=
±2.5V
10
5
0
-5
-10
-15
-2
-1
0
+1
V
S
=
±2.5V
T
A
= 25°C
+2
+3
AMBIENT TEMPERATURE (°C)
COMMON MODE INPUT VOLTAGE (V)
OPEN LOOP VOLTAGE GAIN AS A
FUNCTION OF LOAD RESISTANCE
OPEN LOOP VOLTAGE GAIN (V/mV)
1000
V
S
=
±2.5V
T
A
= 25°C
100
VOLTAGE NOISE DENSITY AS A
FUNCTION OF FREQUENCY
150
VOLTAGE NOISE DENSITY
(nV/
√
Hz)
125
100
75
50
25
0
V
S
=
±2.5V
T
A
= 25°C
10
1
1K
10K
100K
1000K
10
100
1K
10K
100K
1000K
LOAD RESISTANCE (Ω)
FREQUENCY (Hz)
LARGE - SIGNAL TRANSIENT
RESPONSE
5V/div
V
S
=
±2.5V
T
A
= 25°C
R
L
= 10KΩ
C
L
= 50pF
SMALL - SIGNAL TRANSIENT
RESPONSE
100mV/div
V
S
=
±2.5V
T
A
= 25°C
R
L
= 10KΩ
C
L
= 50pF
1V/div
2µs/div
20mV/div
2µs/div
ALD2702A/ALD2702B
ALD2702
Advanced Linear Devices
5 of 9
