A
DVANCED
L
INEAR
D
EVICES,
I
NC.
ALD1702A/ALD1702B
ALD1702/ALD1703
5V RAIL-TO-RAIL PRECISION OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
The ALD1702A/ALD1702B/ALD1702/ALD1703 is a monolithic opera-
tional 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. It is
manufactured with Advanced Linear Devices' enhanced ACMOS silicon
gate CMOS process.
The ALD1702A/ALD1702B/ALD1702/ALD1703 is designed to offer a
balanced trade-off of performance parameters providing a wide range of
desired specifications. It has been developed specifically with the 5V
single supply or
±2.5
dual supply user in mind and offers the industry
pin configuration of
µA741
and ICL7611 types.
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, slew rate of 2.1V/µs, low power
dissipation, low offset voltage and temperature drift, make the ALD1702A/
ALD1702B/ALD1702/ALD1703 a truly versatile, user friendly, operational
amplifier.
The ALD1702A/ALD1702B/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, it 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
• 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 +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 (1MHz min.)
• Slew rate of 2.1V/µs (1.4V/µs min.)
• Low power dissipation
• Suitable for rugged, temperature-extreme
environments
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
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)
ALD1702ASAL
ALD1702BSAL
ALD1702SAL
ALD1703SAL
8-Pin
Plastic Dip
Package
ALD1702APAL
ALD1702BPAL
ALD1702PAL
ALD1703PAL
8-Pin
CERDIP
Package
ALD1702ADA
ALD1702BDA
ALD1702DA
ALD1703DA
N/C
-IN
+IN
V-
1
2
3
4
TOP VIEW
SAL, PAL, DA PACKAGES
* N/C pins are internally connected. Do not connect externally.
8
2
7
6
5
N/C
V+
OUT
N/C
* Contact factory for leaded (non-RoHS) or high temperature versions.
Rev 2.1 ©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
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
±2.0
4.0
1702A
Typ
Max
±5.0
10.0
0.9
1.7
1.0
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
±5.0
10.0
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
±5.0
10.0
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
±5.0
10.0
10.0
11.0
30
450
50
600
4.85
2.35
Unit
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
I
OS
I
B
1.0
1.0
1.0
1.0
V
IR
-0.3
-2.8
R
IN
TCV
OS
7
7
7
10
µV/°C
R
S
≤
100KΩ
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
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
RL =1MΩ V+ = 5V
0°C
≤
T
A
≤
+70°C
R
L
=10KΩ
0°C
≤
T
A
≤
+70°C
Output
Voltage
Range
0.002
V
O
high 4.99 4.998
V
O
low
-2.44
V
O
high 2.35 2.44
I
SC
8
V
O
low
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
Circuit Current
mA
Supply Current I
S
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
Power
Dissipation
Input
Capacitance
Bandwidth
Slew Rate
P
D
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
A
V
= +1
R
L
= 10KΩ
R
L
= 10KΩ
C
L
= 100pF
Rise time
t
r
0.2
0.2
0.2
0.2
µs
ALD1702A/ALD1702B
ALD1702/ALD1703
Advanced Linear Devices
2 of 9
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
10
Max
Min
1702
Typ
10
Max
1703
Min
Typ
10
Max
Unit
%
Test
Conditions
R
L
=10KΩ
C
L
= 100pF
Gain = 1
Gain = 5
Maximum Load
Capacitance
C
L
400
4000
400
4000
400
4000
400
4000
pF
pF
Input Noise
Voltage
e
n
26
26
26
26
nV/√Hz
f =1KHz
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 Min
PSRR
1702A
Typ
Max
83
Min
1702B
Typ
83
Max
Min
1702
Typ
83
Max
Min
1703
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
=
±
2.50V -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
Min
1702ADA
Typ
Max
3.0
Min
1702BDA
Typ
Max
4.0
Min
1702DA
Typ
Max
6.5
Unit
mV
Test
Conditions
R
S
≤
100KΩ
I
OS
8.0
8.0
8.0
nA
I
B
10.0
10.0
10.0
nA
PSRR
60
75
60
75
60
75
dB
R
S
≤
100KΩ
CMRR
60
83
60
83
60
83
dB
R
S
≤
100KΩ
A
V
10
25
10
25
7
25
V/ mV
R
L
= 10KΩ
V
O
low
V
O
high
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
R
L
= 10KΩ
ALD1702A/ALD1702B
ALD1702/ALD1703
Advanced Linear Devices
3 of 9
Design & Operating Notes:
1. The ALD1702A/ALD1702B/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 ALD1702A/ALD1702B/ALD1702/ALD1703 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 ALD1702A/ALD1702B/ALD1702/
ALD1703 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 ALD1702A/ALD1702B/ALD1702/
ALD1703 has shown itself to be more resistant to parasitic
oscillations.
2. The ALD1702A/ALD1702B/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 compatibility 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
ALD1702A/ALD1702B/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 ALD1702A/ALD1702B/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)
OPEN LOOP VOLTAGE
GAIN (V/mV)
±6
±5
±4
±3
±2
±1
0
0
T
A
= 25°C
}
-55°C
}
+25°C
100
}
+125°C
10
R
L
= 10KΩ
R
L
= 5KΩ
1
±1
±2
±3
±4
±5
±6
±7
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)
100
SUPPLY CURRENT (mA)
1000
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 of 9
TYPICAL PERFORMANCE CHARACTERISTICS (cont'd)
OUTPUT VOLTAGE SWING AS A
FUNCTION OF SUPPLY VOLTAGE
±7
OPEN LOOP VOLTAGE GAIN AS
A FUNCTION OF FREQUENCY
120
100
80
60
40
20
0
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
OPEN LOOP VOLTAGE
GAIN (dB)
±6
-55°C
≤
T
A
≤
125°C
PHASE SHIFT IN DEGREES
-20
±3
±4
±5
±6
±7
SUPPLY VOLTAGE (V)
FREQUENCY (Hz)
INPUT OFFSET VOLTAGE (mV)
+5
+4
+3
+2
+1
0
-1
-2
-3
-4
-5
-50
-25
0
+25
+50
INPUT OFFSET VOLTAGE (mV)
INPUT OFFSET VOLTAGE AS A FUNCTION
OF AMBIENT TEMPERATURE
REPRESENTATIVE UNITS
V
S
=
±2.5V
INPUT OFFSET VOLTAGE AS A FUNCTION
OF COMMON MODE INPUT VOLTAGE
15
10
5
0
-5
-10
-15
-2
-1
0
+1
+2
+3
V
S
=
±2.5V
T
A
= 25°C
+75
+100 +125
COMMON MODE INPUT VOLTAGE (V)
AMBIENT TEMPERATURE (°C)
OPEN LOOP VOLTAGE GAIN AS A
FUNCTION OF LOAD RESISTANCE
1000
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
OPEN LOOP VOLTAGE
GAIN (V/mV)
100
10
V
S
=
±2.5V
T
A
= 25°C
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
ALD1702A/ALD1702B
ALD1702/ALD1703
Advanced Linear Devices
5 of 9
Embedded System
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