ALD ALD2701PA Dual micropower rail-to-rail cmos operational amplifier Datasheet

ADVANCED
LINEAR
DEVICES, INC.
ALD2701A/ALD2701B
ALD2701
DUAL MICROPOWER RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
FEATURES
The ALD2701 is a dual monolithic CMOS micropower high slew rate
operational amplifier intended for a broad range of analog applications
using ±1V to ±6V dual power supply systems, as well as +2V to +12V
battery operated systems. All device characteristics are specified for +5V
single supply or ±2.5V dual supply systems. Supply current is 500µA
maximum at 5V supply voltage. It is manufactured with Advanced Linear
Devices' enhanced ACMOS silicon gate CMOS process.
• All parameters specified for +5V single
supply or ±2.5V dual supply systems
• Rail to rail input and output voltage ranges
• Unity gain stable
• Extremely low input bias currents -- 1.0pA
• High source impedance applications
• Dual power supply ±1.0V to ±6.0V
• Single power supply +2V to +12V
• High voltage gain
• Output short circuit protected
• Unity gain bandwidth of 0.7MHz
• Slew rate of 0.7V/µs
• Low power dissipation
• Symmetrical output drive
The ALD2701 is designed to offer a trade-off of performance parameters
providing a wide range of desired specifications. It offers the popular
industry standard pin configuration of µA747 and ICL7621 types.
The ALD2701 has been developed specifically for the +5V single supply or
±1V to ±6V dual supply user. Several important characteristics of the
device make application easier to implement at those voltages.
First, each operational amplifier can operate with rail-to-rail input and
output voltages. This means the signal input voltage and output voltage
can be equal to the positive and negative supply voltages. This feature
allows numerous analog serial stages and flexibility in input signal bias
levels. Secondly, each device was designed to accommodate mixed
applications where digital and analog circuits may operate off the same
power supply or battery. Thirdly, the output stage can typically drive up to
50pF capacitive and 10KΩ resistive loads.
These features, combined with extremely low input currents, high open
loop voltage gain of 100V/mV, useful bandwidth of 700KHz, a slew rate of
0.7V/µs, low power dissipation of 0.5mW, low offset voltage and temperature
drift, make the ALD2701 a versatile, micropower dual operational amplifier.
The ALD2701, designed and fabricated with silicon gate CMOS technology,
offers 1pA typical input bias current. On chip offset voltage trimming allows
the device to be used without nulling in most applications.
Due to low voltage and low power operation, reliability and operating
characteristics, such as input bias currents and warm up time, are greatly
improved.
APPLICATIONS
•
•
•
•
•
•
•
•
•
•
•
•
Voltage follower/buffer/amplifier
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
PIN CONFIGURATION
ORDERING INFORMATION
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
ALD 2701A DA
ALD 2701B DA
ALD 2701 DA
ALD 2701A SA
ALD 2701B SA
ALD 2701 SA
ALD 2701A PA
ALD 2701B PA
ALD 2701 PA
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
* Contact factory for industrial temperature range
© 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
TA = 25 °C VS = ±2.5V unless otherwise specified
Min
2701A
Typ
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
80
80
65
65
80
80
60
60
Common Mode
Rejection Ratio
CMRR
65
65
83
83
65
65
83
83
Large Signal
Voltage Gain
AV
15
100
300
15
100
300
±1.0
2.0
Max
Min
±6.0
12.0
±1.0
2.0
2701B
Typ Max
Parameter
5.3
2.8
ALD2701A/ALD2701B
ALD2701
-0.3
-2.8
5.3
2.8
10
-2.48
2.48
-2.40
2.40
PD
10.0
11.0
mV
mV
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
1.0
30
450
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
1.0
50
600
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
5.3
2.8
V
V
V+ = +5
VS = ±2.5V
5.0
5.8
-0.3
-2.8
7
VO low
VO high
Power
Dissipation
Dual Supply
Single Supply
5
0.01
IS
V
V
5
0.001
4.999
Supply
Current
±6.0
12.0
1012
4.99
ISC
Test
Conditions
1012
VO low
VO high
Output Short
Circuit Current
Unit
1012
10
Output
Voltage
Range
2701
Typ
±6.0 ±1.0
12.0 2.0
2.0
2.8
-0.3
-2.8
Min
240
µV/°C
RS ≤ 100KΩ
80
80
dB
dB
R S ≤ 100KΩ
0°C ≤ TA ≤ +70°C
60
60
83
83
dB
dB
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
10
80
300
V/mV
V/mV
V/mV
RL = 100KΩ
RL ≥ 1MΩ
RL = 100KΩ
0°C ≤ TA ≤ +70°C
7
0.01
V
V
R L= 1MΩ V + = +5V
0°C ≤ TA ≤ +70°C
-2.48 -2.40
2.48
2.40
-2.40
V
V
R L = 100KΩ
0°C ≤ TA ≤ +70°C
1
500
2.5
Ω
0.001 0.01
0.001
4.99 4.999
4.99 4.999
2.40
1
Max
240
-2.48
2.48
1
500
2.5
Advanced Linear Devices
240
mA
500
2.5
µA
mW
VIN = 0V
No Load
Both amplifiers
VS = ±2.5V
2
OPERATING ELECTRICAL CHARACTERISTICS (cont'd)
T A = 25°C VS = ±2.5V unless otherwise specified
Parameter
Symbol
Input
Capacitance
CIN
Bandwidth
BW
Slew Rate
SR
Rise time
tr
Min
2701A
Typ
Max
Min
1
400
Overshoot
Factor
2701B
Typ
Max
Min
2701
Typ
Max
Unit
Test
Conditions
1
1
700
700
KHz
0.7
0.7
0.7
V/µs
AV = +1
RL = 100KΩ
0.2
0.2
0.2
µs
RL = 100KΩ
20
20
20
%
RL = 100KΩ
CL = 50pF
700
400
pF
Settling
Time
ts
10.0
10.0
10.0
µs
0.1%
AV = -1
CL = 50pF RL = 100KΩ
Channel
Separation
CS
120
120
120
dB
AV = 100
TA = 25 °C VS = ±5.0V unless otherwise specified
Min
2701A
Typ
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 = 100KΩ
Output Voltage
Range
VO low
VO high
V
V
RL = 100KΩ
Bandwidth
BW
1.0
1.0
1.0
MHz
Slew Rate
SR
1.0
1.0
1.0
V/µs
-4.90
4.90
-4.98
4.98
Max
-4.90
Min
-4.98
4.90 4.98
Max
-4.90
Unit
Test
Conditions
Power Supply
Rejection Ratio
-4.98
4.98
Min
2701
Typ
Symbol
4.90
Max
2701B
Typ
Parameter
AV = +1
CL = 50pF
VS = ± 2.5V -55°C ≤ TA ≤ +125°C unless otherwise specified
2701 DA
Typ
Max
Unit
6.0
15.0
mV
8.0
8.0
8.0
nA
10.0
10.0
10.0
nA
VOS
3.0
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
50
10
50
7
50
V/mV
RL ≤ 100KΩ
Output Voltage
Range
VO low
VO high
2.35
-2.47
2.45
2.35
-2.47
2.45
V
V
R L ≤ 100KΩ
-2.47
2.45
-2.40
Min
Test
Conditions
Input Offset
Voltage
2.35
Min
2701B DA
Typ Max
Symbol
ALD2701A/ALD2701B
ALD2701
Min
2701A DA
Typ Max
Parameter
-2.40
Advanced Linear Devices
-2.40
RS ≤ 100KΩ
3
Design & Operating Notes:
1. The ALD2701 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 ALD2701 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.
2. The ALD2701 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 below the positive supply voltage.
Since offset voltage trimming on the ALD2701 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 above 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 1012Ω 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 ALD2701 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 not to exceed 0.3V of the power supply voltage
levels.
6. The ALD2701, with its micropower operation, offers numerous benefits
in reduced power supply requirements, less noise coupling and
current spikes, less thermally induced drift, better overall reliability
due to lower self heating, and lower input bias current. It requires
practically no warm up time as the chip junction heats up to only 0.2°C
above ambient temperature under most operating conditions.
TYPICAL PERFORMANCE CHARACTERISTICS
±7
+25°C
INPUTS GROUNDED
OUTPUT UNLOADED
±800
COMMON MODE INPUT VOLTAGE RANGE
AS A FUNCTION OF SUPPLY VOLTAGE
±6
-25°C
COMMON MODE INPUT
VOLTAGE RANGE (V)
SUPPLY CURRENT (µA)
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
TA = -55°C
±600
±400
+70°C
+125°C
±200
0
±5
±4
±3
±2
±1
0
0
±1
±2
±3
±4
±5
±6
±2
±3
±4
±5
±6
±7
SUPPLY VOLTAGE (V)
OPEN LOOP VOLTAGE GAIN AS A
FUNCTION OF LOAD RESISTANCE
INPUT BIAS CURRENT AS A FUNCTION
OF AMBIENT TEMPERATURE
10
VS = ±2.5V
TA = 25°C
INPUT BIAS CURRENT (pA)
10000
100
1
10K
±1
0
SUPPLY VOLTAGE (V)
1000
OPEN LOOP VOLTAGE
GAIN (V/mV)
TA = 25°C
VS = ±2.5V
1000
100
10
1.0
0.1
100K
1M
10M
-50
LOAD RESISTANCE (Ω)
ALD2701A/ALD2701B
ALD2701
-25
0
25
50
75
100
125
AMBIENT TEMPERATURE (°C)
Advanced Linear Devices
4
TYPICAL PERFORMANCE CHARACTERISTICS
OPEN LOOP VOLTAGE GAIN AS A FUNCTION
OF SUPPLY VOLTAGE AND TEMPERATURE
OUTPUT VOLTAGE SWING (V)
OPEN LOOP VOLTAGE
GAIN (V/mV)
1000
OUTPUT VOLTAGE SWING AS A FUNCTION
OF SUPPLY VOLTAGE
100
10
-55°C ≤ TA ≤ +125°C
RL = 100KΩ
±6
+25°C ≤ TA ≤ +125°C
RL = 100KΩ
±5
±4
±3
±2
±1
1
±2
0
±4
±6
±8
0
±1
±2
SUPPLY VOLTAGE (V)
±4
±5
±6
±7
OPEN LOOP VOLTAGE GAIN
AS A FUNCTION OF FREQUENCY
120
+5
+4
OPEN LOOP VOLTAGE
GAIN (dB)
VS = ±2.5V
+3
+2
+1
0
-1
-2
-3
-4
VS = ±2.5V
TA = 25°C
100
80
60
0
40
45
20
90
0
135
180
-20
-5
-50
-25
0
+25
+50
+75
+100 +125
1
10
AMBIENT TEMPERATURE (°C)
INPUT OFFSET VOLTAGE AS A FUNCTION
OF COMMON MODE INPUT VOLTAGE
100
1K
10K 100K
FREQUENCY (Hz)
1M
PHASE SHIFT IN DEGREES
INPUT OFFSET VOLTAGE (mV)
INPUT OFFSET VOLTAGE AS A FUNCTION
OF AMBIENT TEMPERATURE
REPRESENTATIVE UNITS
INPUT OFFSET VOLTAGE (mV)
±3
SUPPLY VOLTAGE (V)
10M
LARGE - SIGNAL TRANSIENT
RESPONSE
15
VS = ±2.5V
TA = 25°C
10
2V/div
VS = ±1.0V
TA = 25°C
RL = 100KΩ
CL = 50pF
500mV/div
5µs/div
5
0
-5
-10
-15
-2
-1
0
+1
+2
+3
COMMON MODE INPUT VOLTAGE (V)
LARGE - SIGNAL TRANSIENT
RESPONSE
5V/div
VS = ±2.5V
TA = 25°C
RL = 100KΩ
CL = 50pF
2V/div
5µs/div
ALD2701A/ALD2701B
ALD2701
SMALL - SIGNAL TRANSIENT
RESPONSE
Advanced Linear Devices
100mV/div
VS = ±2.5V
TA = 25°C
RL = 100KΩ
CL = 50pF
20mV/div
2µs/div
5
TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER
RAIL-TO-RAIL WAVEFORM
INPUT
5V
~ 1012Ω
ZIN =
+5V
0V
0.1µF
-
+5V
OUTPUT
0V
OUTPUT
+
VIN
1/2 ALD2701
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
RAIL-TO-RAIL WINDOW COMPARATOR
HIGH INPUT IMPEDANCE RAIL-TO-RAIL
PRECISION DC SUMMING AMPLIFIER
+5V
8
V+ = +2.5V
V1
V2
VREF (HIGH) 3
100K
1/2 ALD2701
+
1
1/4 74 C00
10M
+
10M
2
0.1µF
1/2 ALD2701
VOUT
10M
-
10M
VOUT
VIN
5
0.1µF
+
7
V- ≤ VIN ≤ V+
V3
V4
V- ≤ VOUT ≤ V+
V- = - 2.5V
10M
VOUT = V1 + V2 - V3 - V4
VREF (LOW) 6
-
100K
4
1/2 ALD2701
10M
RIN = 10MΩ Accuracy limited by resistor tolerances and input offset voltage
VOUT (LOW) FOR VREF (LOW) < VIN < VREF(HIGH)
PHOTO DETECTOR CURRENT TO
VOLTAGE CONVERTER
WIEN BRIDGE OSCILLATOR (RAIL-TO-RAIL)
SINE WAVE GENERATOR
-
RF = 5M
+2.5V
+
10K
-2.5V
C = .01µF
I
VOUT
1/2 ALD2701
.01µF
10K
-2.5V
1/2 ALD2701
~ 1.6KHZ
1
=
2πRC
*See Rail to Rail Waveform
VOUT = 1 X RF
RL = 100K
+
10K
R = 10K
~
f=
+2.5V
-
PHOTODIODE
LOW VOLTAGE INSTRUMENTATION AMPLIFIER
V+
0.1µF
1M
+
100K
-
500K
100K
V-
1/2 ALD2701
f max = 20KHz
-40mV ≤ VIN ≤ 40mV
V+
V+
0.1µF
0.1µF
+
50K
V+ 1M
0.1µF
100K
1M
100K
VOUT
V-
0.1µF
ALD1701
V-
1M
+
V-
0.1µF
1/2 ALD2701
ALD2701A/ALD2701B
ALD2701
GAIN = 25 V- ≤ VOUT ≤ V+ All resistors are 1%
V+ = +1.0V V- = -1.0V Short Circuit Input Current 1µA
Advanced Linear Devices
6
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