ALD ALD2702BDA Dual 5v rail-to-rail precision operational amplifier Datasheet

ADVANCED
LINEAR
DEVICES, INC.
ALD2702A/ALD2702B
ALD2702
DUAL 5V RAIL-TO-RAIL PRECISION OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
FEATURES
The 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 +12V 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.
• Rail-to-rail input and output voltage range
• 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 ±6V operation
• Single power supply +5V to +12V 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
The 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. Secondly, the
device was designed to accommodate mixed applications where digital
and analog circuits may work off the same 5V power supply. Thirdly, 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 ALD2702 a
truly versatile, user friendly, operational amplifier.
The 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 ALD2702 is designed to settle to 0.01% in 8µs.
APPLICATIONS
ORDERING INFORMATION
PIN CONFIGURATION
Operating Temperature Range *
-55°C to +125°C
0°C to +70°C
0°C to +70°C
8-Pin
CERDIP
Package
8-Pin
Small Outline
Package (SOIC)
8-Pin
Plastic Dip
Package
ALD2702A DA
ALD2702B DA
ALD2702 DA
ALD2702A SA
ALD2702B SA
ALD2702 SA
ALD2702A PA
ALD2702B PA
ALD2702 PA
* Contact factory for industrial temperature range
•
•
•
•
•
•
•
•
•
•
•
•
•
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
OUT A
1
8
V+
-IN A
2
7
OUT B
+IN A
3
6
-IN B
V-
4
5
+IN B
TOP VIEW
DA, PA, SA PACKAGE
© 1998 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com
ABSOLUTE MAXIMUM RATINGS
-0.3V to V++13.2V
±6.6V
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
Supply voltage, V+ referenced to VSupply voltage, VS referenced to VDifferential input voltage range
Power dissipation
Operating temperature range PA, SA package
DA package
Storage temperature range
Lead temperature, 10 seconds
OPERATING ELECTRICAL CHARACTERISTICS
TA = 25 °C VS = ±2.5V unless otherwise specified
Min
2702A
Typ
Symbol
Supply
Voltage
VS
V+
Input Offset
Voltage
VOS
Input Offset
Current
IOS
1.0
20
240
1.0
20
240
Input Bias
Current
IB
1.0
20
300
1.0
20
300
Input Voltage
Range
VIR
Input
Resistance
RIN
Input Offset
Voltage Drift
TCVOS
Power Supply
Rejection Ratio
PSRR
65
65
83
83
65
65
83
83
63
63
Common Mode
Rejection Ratio
CMRR
65
65
83
83
65
65
83
83
Large Signal
Voltage Gain
AV
15
28
100
15
28
100
Output
Voltage
Range
VO low
VO high
0.002
4.998
0.01
4.99
VO low
VO high
-2.44
2.44
-2.40
2.40
±2.0
4.0
Max
Min
±6.0
12.0
±2.0
4.0
2702B
Typ Max
Parameter
5.3
+2.8
2702
Typ
Unit
Test
Conditions
V
V
Single Supply
5.0
6.0
mV
mV
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
1.0
20
240
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
1.0
20
300
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
5.3
+2.8
V
V
V+ = +5V
VS = ±2.5V
±6.0 ±2.0
12.0 4.0
1.0
1.5
-0.3
-2.8
Min
±6.0
12.0
2.0
3.0
-0.3
-2.8
5.3
+2.8
Max
-0.3
-2.8
10 12
10 12
1012
7
7
7
Ω
µV/°C
RS ≤ 100KΩ
83
83
dB
R S ≤ 100KΩ
0°C ≤ TA ≤ +70°C
63
63
83
83
dB
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
12
28
100
V/mV
V/mV
RL = 10KΩ
RL ≥ 1MΩ
V
R L = 1MΩ Single supply
0°C ≤ TA ≤ +70°C
V
V
R L = 10KΩ Dual supply
0°C ≤ TA ≤ +70°C
0.002 0.01
4.998
4.99
0.002
4.998
0.01
4.99
-2.44 -2.40
2.44
2.40
-2.44
2.44
-2.40
2.40
8
8
8
mA
Output Short
Circuit Current
ISC
Supply
Current
IS
2.0
3.0
2.0
3.0
2.0
3.0
mA
VIN = 0V No Load
Power
Dissipation
PD
10
15.0
10
15.0
10
15.0
mW
Both amplifiers
VS = ±2.5V
Input
Capacitance
CIN
1
Bandwidth
BW
0.7
1.5
0.7
1.5
0.7
1.5
MHz
Slew Rate
SR
1.1
1.9
1.1
1.9
1.1
1.9
V/µs
AV = +1 RL = 10KΩ
Rise time
tr
Overshoot
1
1
pF
0.2
0.2
0.2
µs
RL = 10KΩ
10
10
10
%
RL = 10KΩ CL = 100pF
Factor
ALD2702A/ALD2702B
ALD2702
Advanced Linear Devices
2
OPERATING ELECTRICAL CHARACTERISTICS (cont'd)
T A = 25°C VS = ±2.5V unless otherwise specified
Min
2702A
Typ
Max
Min
2702B
Typ
Max
Min
2702
Typ
Parameter
Symbol
Maximum Load
Capacitance
CL
400
4000
400
4000
400
4000
Input Noise
Voltage
en
26
26
Input Current
Noise
in
0.6
Settling
Time
ts
8.0
3.0
Max
Unit
Test Conditions
pF
pF
Gain = 1
Gain = 5
26
nV/√H Z
f = 1KHZ
0.6
0.6
fA/√HZ
f = 10HZ
8.0
3.0
8.0
3.0
µs
µs
0.01%
0.1% AV = -1
RL = 5KΩ CL = 50pF
TA = 25 °C VS = ±5.0V unless otherwise specified
Min
2702A
Typ
Unit
Test Conditions
Power Supply
Rejection Ratio
PSRR
83
83
83
dB
RS ≤ 100KΩ
Common Mode
Rejection Ratio
CMRR
83
83
83
dB
RS ≤ 100KΩ
Large Signal
Voltage Gain
AV
250
250
250
V/mV
RL = 10KΩ
Output Voltage
Range
VO low
VO high
V
RL = 10KΩ
Bandwidth
BW
1.7
1.7
1.7
MHZ
Slew Rate
SR
2.8
2.8
2.8
V/µs
AV =+1
CL =50pF
2702 DA
Typ
Max
Unit
Test Conditions
RS ≤ 100KΩ
-4.90
4.93
Min
-4.8
4.8
-4.90
4.93
Max
Min
2702
Typ
Symbol
4.8
Max
2702B
Typ
Parameter
-4.8
4.8
-4.90
4.93
Max
-4.8
VS = +5.0V -55 °C ≤ TA ≤ +125°C unless otherwise specified
Min
2702B DA
Typ Max
Symbol
Input Offset
Voltage
VOS
2.0
4.0
7.0
mV
Input Offset
Current
IOS
8.0
8.0
8.0
nA
Input Bias
Current
IB
10.0
10.0
10.0
nA
Power Supply
Rejection Ratio
PSRR
60
75
60
75
60
75
dB
RS ≤ 100KΩ
Common Mode
Rejection Ratio
CMRR
60
83
60
83
60
83
dB
RS ≤ 100KΩ
Large Signal
Voltage Gain
AV
10
25
10
25
7
25
V/mV
RL ≤ 10KΩ
Output Voltage
Range
VO low
VO high
0.1
4.9
4.8
0.1
4.9
RL ≤ 10KΩ
4.8
0.1
4.9
V
4.8
ALD2702A/ALD2702B
ALD2702
Min
2702A DA
Typ Max
Parameter
0.2
Min
0.2
Advanced Linear Devices
0.2
3
Design & Operating Notes:
1. The 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 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 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 ALD2702 has shown itself to be more resistant to
parasitic oscillations.
2. The 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
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 ALD2702 an effective analog signal buffer for medium to
high source impedance sensors, transducers, and other circuit
networks.
5. The 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
OPEN LOOP VOLTAGE GAIN AS A FUNCTION
OF SUPPLY VOLTAGE AND TEMPERATURE
1000
±6
TA = 25°C
OPEN LOOP VOLTAGE
GAIN (V/mV)
COMMON MODE INPUT
VOLTAGE RANGE (V)
±7
±5
±4
±3
±2
} -55°C
} +25°C
100
} +125°C
10
RL= 10KΩ
RL= 5KΩ
±1
1
0
0
±1
±2
±3
±4
±5
±6
±7
0
±2
INPUT BIAS CURRENT AS A FUNCTION
OF AMBIENT TEMPERATURE
±8
±6
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
6
10000
VS = ± 2.5V
1000
SUPPLY CURRENT (mA)
INPUT BIAS CURRENT (pA)
±4
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
100
10
1.0
INPUTS GROUNDED
OUTPUTS UNLOADED
5
4
TA = -55°C
3
-25°C
+25°C
2
+80°C
+125°C
1
0
0.1
-50
-25
0
25
50
75
100
±1
125
ALD2702A/ALD2702B
ALD2702
±2
±3
±4
±5
±6
SUPPLY VOLTAGE (V)
AMBIENT TEMPERATURE (°C)
Advanced Linear Devices
4
TYPICAL PERFORMANCE CHARACTERISTICS
±7
120
OPEN LOOP VOLTAGE
GAIN (dB)
±25°C ≤ TA ≤ 125°C
±6
RL = 10KΩ
RL = 10KΩ
±5
±4
RL = 2KΩ
±3
±2
VS = ±2.5V
TA = 25°C
100
80
60
0
40
45
20
90
0
135
180
-20
0
±1
±2
±3
±4
±5
±6
±7
1
10
100
SUPPLY VOLTAGE (V)
100K
1M
10M
INPUT OFFSET VOLTAGE AS A FUNCTION
OF COMMON MODE INPUT VOLTAGE
15
+5
+4
INPUT OFFSET VOLTAGE (mV)
INPUT OFFSET VOLTAGE (mV)
10K
FREQUENCY (Hz)
INPUT OFFSET VOLTAGE AS A FUNCTION
OF AMBIENT TEMPERATURE
REPRESENTATIVE UNITS
VS = ±2.5V
+3
+2
+1
0
-1
-2
-3
-4
VS = ±2.5V
TA = 25°C
10
5
0
-5
-10
-15
-5
-50
OPEN LOOP VOLTAGE GAIN (V/mV)
1K
PHASE SHIFT IN DEGREES
OUTPUT VOLTAGE SWING (V)
OPEN LOOP VOLTAGE GAIN AS
A FUNCTION OF FREQUENCY
OUTPUT VOLTAGE SWING AS A
FUNCTION OF SUPPLY VOLTAGE
-25
0
+25
+50
+75
-2
+100 +125
-1
0
+1
+2
AMBIENT TEMPERATURE (°C)
COMMON MODE INPUT VOLTAGE (V)
OPEN LOOP VOLTAGE GAIN AS A
FUNCTION OF LOAD RESISTANCE
LARGE - SIGNAL TRANSIENT
RESPONSE
+3
1000
5V/div
VS = ±2.5V
TA = 25°C
100
VS = ±2.5V
TA = 25°C
RL = 10KΩ
CL = 50pF
10
1V/div
2µs/div
1
1K
10K
1000K
100K
LOAD RESISTANCE (Ω)
SMALL - SIGNAL TRANSIENT
RESPONSE
VOLTAGE NOISE DENSITY AS A
FUNCTION OF FREQUENCY
VOLTAGE NOISE DENSITY
(nV/ √ Hz)
150
100mV/div
125
VS = ±2.5V
TA = 25°C
100
VS = ±2.5V
TA = 25°C
RL = 10KΩ
CL = 50pF
75
50
25
20mV/div
2µs/div
0
10
100
1K
10K
100K
1000K
FREQUENCY (Hz)
ALD2702A/ALD2702B
ALD2702
Advanced Linear Devices
5
TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER
RAIL-TO-RAIL WAVEFORM
INPUT
5V
~ 1012Ω
ZIN =
+5V
0V
0.1µF
-
VIN
CL
+
+5V
OUTPUT
0V
OUTPUT
RL =10KΩ
400pF
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
PHOTO DETECTOR CURRENT
TO VOLTAGE CONVERTER
LOW OFFSET SUMMING AMPLIFIER
RF = 5M
50K
+2.5V
10K
INPUT 1
INPUT 2
I
.01µF
OUTPUT
GAIN = 5
+2.5V
-
10K
.01µF
+
+
CL = 4000pF
* Circuit Drives Large Load
Capacitance ≤ 4000pF
VOUT = I x RF
PHOTODIODE
-2.5V
RL = 10K
- 2.5V
RAIL-TO-RAIL VOLTAGE COMPARATOR
WIEN BRIDGE OSCILLATOR (RAIL-TO -RAIL)
SINE WAVE GENERATOR
+5V
+2.5V
-
OUTPUT
+
.01µF
C = .01µF
10K
-2.5V
0.1µF
-
+5V
50K
10K
OUTPUT
+
10K
R = 10K
1
f =~
2πRC
VIN
10M
~ 1.6KHz
* See rail to rail waveform
ALD2702A/ALD2702B
ALD2702
Advanced Linear Devices
6
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