ALD ALD4702 Quad 5v rail-to-rail precision operational amplifier Datasheet

ADVANCED
LINEAR
DEVICES, INC.
ALD4702A/ALD4702B
ALD4702
QUAD 5V RAIL-TO-RAIL PRECISION OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
FEATURES
The ALD4702 is a quad monolithic precision CMOS rail-to-rail
operational amplifier intended for a broad range of analog applications
using ±2.5V to ±6V 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. 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.
• 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 +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 ALD4702 is designed to offer a trade-off of performance
parameters providing a wide range of desired specifications. It offers
the popular industry pin configuration of LM324 and ICL7641 types.
The ALD4702 has been developed specifically with the +5V single
supply or ±2.5V dual supply user. 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 2.1V/µs, low
power dissipation, low offset voltage and temperature drift, make the
ALD4702 a truly versatile, user friendly, operational amplifier.
The 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 ALD4702 is designed to settle to
0.01% in 8µs.
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
ORDERING INFORMATION
Operating Temperature Range*
-55°C to +125°C
0°C to +70°C
0°C to +70°C
14-Pin
CERDIP
Package
14-Pin
Small Outline
Package (SOIC)
14-Pin
Plastic Dip
Package
ALD4702A DB
ALD4702B DB
ALD4702 DB
ALD4702A SB
ALD4702B SB
ALD4702 SB
ALD4702A PB
ALD4702B PB
ALD4702 PB
* Contact factory for industrial temperature range
OUT A
1
14
OUT D
-IN A
2
13
-IN D
+IN A 3
12
+IN D
V+
4
11
V-
+IN B 5
10
+IN C
-IN B
6
9
-IN C
OUT B
7
8
OUT C
DB, PB, SB 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 PB, SB package
DB package
Storage temperature range
Lead temperature, 10 seconds
OPERATING ELECTRICAL CHARACTERISTICS
TA = 25 °C VS = ±2.5V unless otherwise specified
Min
4702A
Typ
Max
Min
4702B
Typ Max
Min
±6.0
12.0
±2.0
4.0
±6.0
12.0
±2.0
4.0
Parameter
Symbol
Supply
Voltage
VS
V+
Input Offset
Voltage
VOS
Input Offset
Current
IOS
1.0
25
240
1.0
25
240
Input Bias
Current
IB
1.0
30
300
1.0
30
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
60
60
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
1.0
2.0
-0.3
-2.8
5.3
+2.8
4702
Typ
Max
Unit
Test Conditions
V
V
Dual Supply
Single Supply
5.0
6.5
mV
mV
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
1.0
25
240
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
1.0
30
300
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
5.3
+2.8
V
V
V+ = +5V
VS = ±2.5V
±6.0
12.0
2.0
3.5
-0.3
-2.8
5.3
+2.8
-0.3
-2.8
10 12
10 12
10 12
7
7
7
0.002
4.99 4.998
2.40
8
0.01
-2.44 -2.40
2.44
Ω
µV/°C
RS ≤ 100KΩ
83
83
dB
R S ≤ 100KΩ
0°C ≤ TA ≤ +70°C
60
60
83
83
dB
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
12
28
100
V/mV
V/mV
RL = 10KΩ
RL ≥ 1MΩ
0.01
V
R L = 1MΩ Single supply
0°C ≤ TA ≤ +70°C
-2.44 -2.40
2.44
V
R L = 10KΩ Dual supply
0°C ≤ TA ≤ +70°C
0.002
4.99 4.998
2.40
8
8
mA
Output Short
Circuit Current
ISC
Supply
Current
IS
4.0
6.0
4.0
6.0
4.0
6.0
mA
VIN = 0V No Load
Power
Dissipation
PD
20
30
20
30
20
30
mW
VS = ±2.5V
All four amplifiers
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
Factor
ALD4702A/ALD4702B
ALD4702
1
1
pF
0.2
0.2
0.2
µs
RL = 10KΩ
10
10
10
%
RL = 10KΩ CL = 100pF
Advanced Linear Devices
2
OPERATING ELECTRICAL CHARACTERISTICS (cont'd)
T A = 25°C VS = ±2.5V unless otherwise specified
Min
Max
Min
4702
Typ
Maximum Load
Capacitance
CL
400
4000
400
4000
400
4000
Input Noise
Voltage
en
26
26
in
0.6
ts
8.0
3.0
Settling
Time
Max
4702B
Typ
Symbol
Input Current
Noise
Min
4702A
Typ
Parameter
Max
Uni
Test Conditions
pF
pF
Gain = 1
Gain = 5
26
nV/√Hz
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
4702A
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
-4.90
4.93
Min
-4.8
4.8
-4.90
4.93
Max
Min
4702
Typ
Symbol
4.8
Max
4702B
Typ
Parameter
-4.8
4.8
-4.90
4.93
Max
-4.8
AV = +1
CL = 50pF
VS = +5.0V -55 °C ≤ TA ≤ +125°C unless otherwise specified
4702 DA
Typ
Max
Unit
Test Conditions
4.0
7.0
mV
RS ≤ 100KΩ
8.0
8.0
8.0
nA
10.0
10.0
10.0
nA
Min
4702B DA
Typ Max
Symbol
Input Offset
Voltage
VOS
2.0
Input Offset
Current
IOS
Input Bias
Current
IB
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
AV = +1
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
ALD4702A/ALD4702B
ALD4702
Min
4702A DA
Typ Max
Parameter
0.2
Min
0.2
Advanced Linear Devices
0.2
3
Design & Operating Notes:
1. The 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 ALD4702 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 ALD4702 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 ALD4702 is much more
resistant to parasitic oscillations.
2. The ALD4702 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 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.
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 ALD4702 an
effective analog signal buffer for medium to high source impedance sensors, transducers, and other circuit networks.
5. The 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 accuracy effects.
3. The input bias and offset currents are essentially input protection diode
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
±7
1000
} -55°C
TA = 25°C
OPEN LOOP VOLTAGE
GAIN (V/mV)
COMMON MODE INPUT
)
VOLTAGE
RANGE (V
±6
±5
±4
±3
±2
±1
} +125°C
10
RL= 10KΩ
RL= 5KΩ
1
0
±1
0
±2
±3
±4
±5
±6
±7
±2
0
±4
±6
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
INPUT BIAS CURRENT AS A FUNCTION
OF AMBIENT TEMPERATURE
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
±8
12
SUPPLY CURRENT (mA)
10000
INPUT BIAS CURRENT (pA)
} +25°C
100
VS = ± 2.5V
1000
100
10
1.0
INPUTS GROUNDED
OUTPUTS UNLOADED
10
8
TA = -55°C
6
-25°C
+25°C
4
+80°C
+125°C
2
0
0.1
-50
-25
0
25
50
75
100
±1
125
±3
±4
±5
±6
SUPPLY VOLTAGE (V)
AMBIENT TEMPERATURE (°C)
ALD4702A/ALD4702B
ALD4702
±2
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
INPUT OFFSET VOLTAGE AS A FUNCTION
OF AMBIENT TEMPERATURE
REPRESENTATIVE UNITS
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)
SUPPLY VOLTAGE (V)
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
-25
0
+25
+50
+75
-2
+100 +125
-1
0
+1
+2
+3
COMMON MODE INPUT VOLTAGE (V)
AMBIENT TEMPERATURE (°C)
OPEN LOOP VOLTAGE GAIN AS A
FUNCTION OF LOAD RESISTANCE
VOLTAGE NOISE DENSITY AS A
FUNCTION OF FREQUENCY
1000
150
VS = ±2.5V
TA = 25°C
VOLTAGE NOISE DENSITY
(nV/ √ Hz)
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
100
10
1
125
VS = ±2.5V
TA = 25°C
100
75
50
25
0
1K
10K
1000K
100K
10
100
1K
10K
100K
LOAD RESISTANCE (Ω)
FREQUENCY (Hz)
LARGE - SIGNAL TRANSIENT
RESPONSE
SMALL - SIGNAL TRANSIENT
RESPONSE
5V/div
1V/div
ALD4702A/ALD4702B
ALD4702
100 mV/div
VS = ±2.5V
TA = 25°C
RL = 10KΩ
CL = 50pF
20 mV/div
2µs/div
Advanced Linear Devices
1000K
VS = ±2.5V
TA = 25°C
RL = 10KΩ
CL = 50pF
2µs/div
5
TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER
RAIL-TO-RAIL WAVEFORM
5V
= 1012Ω
ZIN ~
INPUT
0.1µF
+5V
0V
VIN
+5V
OUTPUT
0V
OUTPUT
CL
+
RL =10KΩ
400pF
0 ≤ VIN ≤ 5V
Performance waveforms.
Upper trace is the output of a
Wien Bridge Oscillator. Lower
trace is the output of Rail-to-Rail
voltage follower.
* 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
10K
OUTPUT
GAIN = 5
VOUT = I x RF
PHOTODIODE
.01µF
+
+
CL = 4000pF
* Circuit Drives Large Load
Capacitance ≤ 4000pF
+2.5V
-
-
-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
10K
0.1µF
-
+5V
50K
OUTPUT
+
10K
R = 10K
f =~
VIN
1
2πRC
10M
~ 1.6KHz
* See rail to rail waveform
ALD4702A/ALD4702B
ALD4702
Advanced Linear Devices
6
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