A
DVANCED
L
INEAR
D
EVICES,
I
NC.
ALD1702A/ALD1702B
ALD1702/ALD1703
5V RAIL-TO-RAIL PRECISION OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
The ALD1702/ALD1703 is a 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. It is manufactured with Advanced
Linear Devices' enhanced ACMOS silicon gate CMOS process.
The device is designed to offer a balanced trade-off of performance
parameters providing a wide range of desired specifications. It offers the
industry pin configuration of
µA741
and ICL7611 types.
The ALD1702/ALD1703 has been developed specifically with the 5V
single supply or
±2.5
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, slew rate of 2.1V/µs, low power
dissipation, low offset voltage and temperature drift, make the ALD1702/
ALD1703 a truly versatile, user friendly, operational amplifier.
The ALD1702/ALD1703 is designed and fabricated with silicon gate
CMOS technology, and offers 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 ALD1702 is designed to settle to 0.01% in 8µs.
FEATURES
• Rail-to-rail input and output voltage ranges
• All parameters specified for +5V single
supply or
±2.5V
dual supply systems.
• High load capacitance capability --
4000pF typical
• No frequency compensation required --
unity gain stable
• Extremely low input bias currents --
1.0pA typical (30pA max.)
• Ideal for high source impedance applications
• Dual power supply
±2.5V
to
±5.0V
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
(1.0MHz min.)
• Slew rate of 2.1V/µs (1.4V/µs min.)
• Low power dissipation
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
Coaxial cable driver
ORDERING INFORMATION
Operating Temperature Range
-55°C to +125°C
0°C to +70°C
0°C to +70°C
8-Pin
CERDIP
Package
ALD1702A DA
ALD1702B DA
ALD1702 DA
ALD1703 DA
8-Pin
Small Outline
Package (SOIC)
ALD1702A SA
ALD1702B SA
ALD1702 SA
ALD1703 SA
8-Pin
Plastic Dip
Package
ALD1702A PA
ALD1702B PA
ALD1702 PA
ALD1703 PA
PIN CONFIGURATION
N/C
-IN
+IN
V-
1
2
3
4
TOP VIEW
DA, PA, SA PACKAGE
2
8
7
6
5
N/C
V+
OUT
N/C
* Contact factory for industrial temperature range
* N/C Pin is internally connected. Do not connect externally.
© 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
Supply voltage, V
+
Differential input voltage range
Power dissipation
Operating temperature range PA, SA package
DA package
Storage temperature range
Lead temperature, 10 seconds
13.2V
-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
Symbol Min
V
S
V
+
V
OS
I
OS
1.0
±2.0
4.0
1702A
Typ
Max
±6.0
12.0
0.9
1.7
25
240
30
300
5.3
2.8
10
12
-0.3
-2.8
10
12
1.0
Min
±2.0
4.0
1702B
Typ
Max
±6.0
12.0
2.0
2.8
25
240
30
300
5.3
2.8
-0.3
-2.8
10
12
1.0
Min
±2.0
4.0
1702
Typ Max
±6.0
12.0
4.5
5.3
25
240
30
300
5.3
2.8
0.15
-2.35
10
12
1.0
Min
±2.0
4.0
1703
Typ
Max
±6.0
12.0
10.0
11.0
30
450
50
600
4.85
2.35
Unit
V
mV
mV
pA
pA
pA
pA
V
V
Ω
µV/°C
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
=10KΩ
0°C
≤
T
A
≤
+70°C
R L =1MΩ V+ = 5V
0°C
≤
T
A
≤
+70°C
R
L
=10KΩ
0°C
≤
T
A
≤
+70°C
Test
Conditions
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
I
B
1.0
1.0
1.0
1.0
V
IR
R
IN
-0.3
-2.8
TCV
OS
7
7
7
10
Power Supply PSRR
Rejection Ratio
Common Mode CMRR
Rejection Ratio
Large Signal
Voltage Gain
A
V
70
70
70
70
50
20
80
80
83
83
85
400
65
65
65
65
50
20
80
80
83
83
85
400
65
65
65
65
50
20
80
80
83
83
85
400
60
60
60
60
32
10
80
80
83
83
85
300
dB
dB
dB
dB
V/mV
V/mV
V/mV
Output
Voltage
Range
V
O
low
V
O
high
V
O
low
V
O
high
0.002
4.99 4.998
-2.44
2.35 2.44
8
0.01
4.99
-2.35
2.35
0.002 0.01
4.998
-2.44 -2.35
2.44
8
4.99
2.35
0.002 0.01
4.998
-2.44 -2.35
2.44
8
4.99
2.3
0.002
4.998
-2.4
2.4
8
0.01
-2.3
V
V
V
Output Short
I
SC
Circuit Current
Supply Current I
S
Power
Dissipation
Input
Capacitance
Bandwidth
Slew Rate
P
D
mA
1.1
2.0
1.1
2.0
1.1
2.0
1.1
2.5
mA
V
IN
= 0V
No Load
V
S
=
±2.5V
5.5
10.0
5.5
10.0
5.5
10.0
5.5
12.5
mW
C
IN
1
1
1
1
pF
B
W
S
R
1.0
1.4
1.5
2.1
1.0
1.4
1.5
2.1
1.0
1.4
1.5
2.1
0.7
1.1
1.5
2.1
MHz
V/µs
µs
A
V
= +1
R
L
= 10KΩ
R
L
= 10KΩ
C
L
= 100pF
Rise time
t
r
0.2
0.2
0.2
0.2
ALD1702A/ALD1702B
ALD1702/ALD1703
Advanced Linear Devices
2
OPERATING ELECTRICAL CHARACTERISTICS (cont'd)
T
A
= 25
°
C V
S
=
±
2.5V unless otherwise specified
Parameter
Overshoot
Factor
Symbol
Min
1702A
Typ
Max
10
Min
1702B
Typ
Max
10
Min
1702
Typ
10
Max
1703
Min
Typ
10
Max
Unit
%
Test
Conditions
R
L
=10KΩ
C
L
= 100pF
Gain = 1
Gain = 5
f =1KHz
Maximum Load
Capacitance
Input Noise
Voltage
C
L
400
4000
26
400
4000
26
400
4000
26
400
4000
26
pF
pF
nV/√Hz
e
n
Input Current
Noise
Settling Time
i
n
0.6
0.6
0.6
0.6
fA/√Hz
f =10Hz
t
s
8.0
3.0
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
Parameter
Power Supply
Rejection Ratio
Symbol
PSRR
Min
1702A
Typ
Max
83
Min
1702B
Typ
Max
83
Min
1702
Typ
83
Max
1703
Min
Typ
83
Max
Unit
dB
Test
Conditions
R
S
≤
100KΩ
Common Mode CMRR
Rejection Ratio
83
83
83
83
dB
R
S
≤
100KΩ
Large Signal
Voltage Gain
A
V
250
250
250
250
V/mV
R
L
=10KΩ
Output Voltage V
O
low
Range
V
O
high
Bandwidth
Slew Rate
B
W
S
R
4.8
-4.9
4.93
1.7
2.8
-4.8
4.8
-4.9
4.93
1.7
2.8
-4.8
4.8
-4.9
4.93
1.7
2.8
-4.8
4.8
-4.9
4.93
1.7
2.8
-4.8
V
R
L
=10KΩ
MHz
V/µs
A
V
= +1
C
L
= 50pF
V
S
=
±
2.5V -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
I
B
10.0
10.0
10.0
nA
R
S
≤
100KΩ
R
S
≤
100KΩ
Symbol
V
OS
I
OS
1702A DA
Min
Typ
Max
3.0
Min
1702B DA
Typ
Max
4.0
Min
1702 DA
Typ
Max
6.5
Unit
mV
Test
Conditions
R
S
≤
100KΩ
8.0
8.0
8.0
nA
PSRR
60
75
60
75
60
75
dB
CMRR
60
83
60
83
60
83
dB
A
V
V
O
low
V
O
high
10
25
10
25
7
25
V/ mV
R
L
= 10KΩ
R
L
= 10KΩ
4.8
0.1
4.9
0.2
4.8
0.1
4.9
0.2
4.8
0.1
4.9
0.2
V
ALD1702A/ALD1702B
ALD1702/ALD1703
Advanced Linear Devices
3
Design & Operating Notes:
1. The ALD1702/ALD1703 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 ALD1702 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.
A unity gain buffer using the ALD1702 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 ALD1702
has shown itself to be more resistant to parasitic oscillations.
2. The ALD1702/ALD1703 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 compa-
tibility with other operational amplifiers, this switching point has been
selected to be about 1.5V above the negative supply voltage. Since
offset voltage trimming on the ALD1702/ALD1703 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 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 ALD1702/ALD1703 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.
TYPICAL PERFORMANCE CHARACTERISTICS
COMMON MODE INPUT VOLTAGE RANGE
AS A FUNCTION OF SUPPLY VOLTAGE
±7
OPEN LOOP VOLTAGE GAIN AS A FUNCTION
OF SUPPLY VOLTAGE AND TEMPERATURE
1000
COMMON MODE INPUT
VOLTAGE RANGE (V)
±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
±5
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
INPUTS GROUNDED
OUTPUT UNLOADED
INPUT BIAS CURRENT (pA)
1000
100
SUPPLY CURRENT (mA)
V
S
=
±
2.5V
±4
±3
±2
±1
0
T
A
= -55ºC
-25°C
+25°C
+80°C
+125°C
10
1.0
0.1
-50
-25
0
25
50
75
100
125
0
±1
±2
±3
±4
±5
±6
AMBIENT TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
ALD1702A/ALD1702B
ALD1702/ALD1703
Advanced Linear Devices
4
TYPICAL PERFORMANCE CHARACTERISTICS
±7
OUTPUT VOLTAGE SWING AS A
FUNCTION OF SUPPLY VOLTAGE
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)
±5
±4
±3
±2
0
±1
±2
RL = 10KΩ
R
L
= 10KΩ
R
L
= 2KΩ
±3
±4
±5
±6
±7
SUPPLY VOLTAGE (V)
OPEN LOOP VOLTAGE
GAIN (dB)
±6
±25°C ≤
T
A
≤
125°C
PHASE SHIFT IN DEGREES
FREQUENCY (Hz)
INPUT OFFSET VOLTAGE AS A FUNCTION
OF AMBIENT TEMPERATURE
REPRESENTATIVE UNITS
INPUT OFFSET VOLTAGE (mV)
V
S
=
±2.5V
INPUT OFFSET VOLTAGE AS A FUNCTION
OF COMMON MODE INPUT VOLTAGE
15
INPUT OFFSET VOLTAGE (mV)
+5
+4
+3
+2
+1
0
-1
-2
-3
-4
-5
-50
-25
0
+25
+50
10
5
0
-5
-10
-15
V
S
=
±2.5V
T
A
= 25°C
+75
+100 +125
-2
-1
0
+1
+2
+3
AMBIENT TEMPERATURE (°C)
COMMON MODE INPUT VOLTAGE (V)
OPEN LOOP VOLTAGE GAIN AS A
FUNCTION OF LOAD RESISTANCE
1000
LARGE - SIGNAL TRANSIENT
RESPONSE
5V/div
OPEN LOOP VOLTAGE
GAIN (V/mV)
100
V
S
=
±2.5V
T
A
= 25°C
R
L
= 10KΩ
C
L
= 50pF
10
V
S
=
±2.5V
T
A
= 25°C
1V/div
1
1K
10K
100K
1000K
2µs/div
LOAD RESISTANCE (Ω)
VOLTAGE NOISE DENSITY AS A
FUNCTION OF FREQUENCY
150
SMALL - SIGNAL TRANSIENT
RESPONSE
100mV/div
V
S
=
±2.5V
T
A
= 25°C
R
L
= 10KΩ
C
L
= 50pF
VOLTAGE NOISE DENSITY
(nV/
√
Hz)
125
100
75
50
25
V
S
=
±2.5V
T
A
= 25°C
20mV/div
2µs/div
0
10
100
1K
10K
100K
1000K
FREQUENCY (Hz)
ALD1702A/ALD1702B
ALD1702/ALD1703
Advanced Linear Devices
5
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