A
DVANCED
L
INEAR
D
EVICES,
I
NC.
ALD4702A/ALD4702B
ALD4702
QUAD 5V RAIL-TO-RAIL PRECISION OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
The ALD4702A/ALD4702B/ALD4702 is a quad monolithic precision
CMOS rail-to-rail operational amplifier intended for a broad range of
analog applications using
±2.5V
to
±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. Total
supply current for four operational amplifiers is 6mA maximum at 5V
supply voltage. It is manufactured with Advanced Linear Devices'
enhanced ACMOS silicon gate CMOS process.
The ALD4702A/ALD4702B/ALD4702 is designed to offer a trade-off of
performance parameters providing a wide range of desired
specifications. It has been developed specifically with the +5V single
supply or
±2.5V
dual supply user andoffers the popular industry pin
configuration of LM324 and ICL7641 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, a slew rate of 2.1V/µs, low
power dissipation, low offset voltage and temperature drift, make the
ALD4702A/ALD4702B/ALD4702 a truly versatile, user friendly,
operational amplifier.
The ALD4702A/ALD4702B/ALD4702 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 ALD4702A/
ALD4702B/ALD4702 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.
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
14-Pin
Small Outline
Package (SOIC)
ALD4702ASBL
ALD4702BSBL
ALD4702SBL
14-Pin
Plastic Dip
Package
ALD4702APBL
ALD4702BPBL
ALD4702PBL
14-Pin
CERDIP
Package
ALD4702ADB
ALD4702BDB
ALD4702DB
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
• Inputs can extend beyond supply rails by 300mV
• Outputs settle to 2mV of supply rails
• High load capacitance capability up to 4000pF
• 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
±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
• Slew rate of 1.9V/µs
• 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 convert
Coaxial cable driver
PIN CONFIGURATION
OUT
A
-IN
A
1
2
14
13
12
11
10
9
8
OUT
D
-IN
D
+IN
D
V-
+IN
C
-IN
C
OUT
C
+IN
A
3
V+
4
+IN
B
5
-IN
B
OUT
B
6
7
* Contact factory for leaded (non-RoHS) or high temperature versions.
TOP VIEW
SBL, PBL, DB PACKAGES
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 SBL, PBL packages
DB 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
4702A
Min Typ
±2.0
4.0
Max
±5.0
10.0
1.0
2.0
25
240
30
300
5.3
+2.8
-0.3
-2.8
10
12
1.0
1.0
4702B
Min Typ Max
±2.0
4.0
4702
Min Typ
Max
±5.0
10.0
5.0
6.5
1.0
1.0
-0.3
-2.8
10
12
25
240
30
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
3.5
25
240
30
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
60
60
60
60
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
4.0
6.0
4.0
6.0
4.0
6.0
mA
V
IN
= 0V No Load
Both amplifiers
V
S
=
±2.5V
20
30
20
30
20
30
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
ALD4702A/ALD4702B
ALD4702
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
4702A
Min
Typ
400
4000
Max
4702B
Min Typ
400
4000
Max
Min
4702
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
4702A
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
4702B
Typ
83
Max
Min
4702
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
4702ADA
Min
Typ Max
2.0
8.0
10.0
60
60
10
75
83
25
0.1
4.9
0.2
4.8
4702BDA
Min Typ Max
4.0
8.0
10.0
60
60
7
75
83
25
0.1
4.9
0.2
Min
4702DA
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
ALD4702A/ALD4702B
ALD4702
Advanced Linear Devices
3 of 9
Design & Operating Notes:
1. The ALD4702A/ALD4702B/ALD4702 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 ALD4702A/ALD4702B/ALD4702 is
internally compensated for unity gain stability using a novel scheme.
This design produces a clean single pole roll off in the gain character-
istics while providing for more than 70 degrees of phase margin at the
unity gain frequency. A unity gain buffer using the ALD4702A/
ALD4702B/ALD4702 will typically drive 400pF of external load capaci-
tance without stability problems. In the inverting unity gain configura-
tion, it can drive up to 800pF of load capacitance. Compared to other
CMOS operational amplifiers, the ALD4702A/ALD4702B/ALD4702 is
much more resistant to parasitic oscillations.
2. The ALD4702A/ALD4702B/ALD4702 has complementary p-channel
and n-channel input differential stages connected in parallel to accom-
plish 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 ALD4702A/ALD4702B/ALD4702 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 ALD4702A/ALD4702B/
ALD4702 an effective analog signal buffer for medium to high
source impedance sensors, transducers, and other circuit net-
works.
5. The ALD4702A/ALD4702B/ALD4702 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 accu-
racy 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
±6
±5
±4
±3
±2
±1
0
0
OPEN LOOP VOLTAGE
GAIN (V/mV)
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
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
12
INPUT BIAS CURRENT (pA)
1000
100
V
S
=
±
2.5V
SUPPLY CURRENT (mA)
10
8
INPUTS GROUNDED
OUTPUTS UNLOADED
T
A
= -55°C
6
4
2
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)
ALD4702A/ALD4702B
ALD4702
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
-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
ALD4702A/ALD4702B
ALD4702
Advanced Linear Devices
5 of 9
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