ALD ALD4701BDB Quad micopower rail to rail cmos operatioanal amplifier Datasheet

ADVANCED
LINEAR
DEVICES, INC.
ALD4701A/ALD4701B
ALD4701
QUAD MICROPOWER RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
FEATURES
The ALD4701 is a quad 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. Total supply current for all four
operational amplifiers is 1mA 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 ALD4701 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 LM324 types and ICL 7641 types.
The ALD4701 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 these 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 or near 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 5mW, low offset voltage and temperature
drift, make the ALD4701 a versatile, micropower quad operational amplifier.
The ALD4701, designed and fabricated with silicon gate CMOS technology,
offers 1pA typical input bias current. Due to low voltage and low power
operation, reliability and operating characteristics, such as input bias
currents and warm up time, are greatly improved.
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
ALD4701A DB
ALD4701B DB
ALD4701 DB
ALD4701A SB
ALD4701B SB
ALD4701 SB
ALD4701A PB
ALD4701B PB
ALD4701 PB
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
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
* 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 PB,SB package
DB 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 V+ = 5.0V ( VS = ±2.5V in dual supply operation ) unless otherwise specified
4701A
Typ
Max
Min
±6.0
12.0
±1.0
2.0
4701B
Typ Max
Parameter
Symbol
Min
Supply
Voltage
VS
V+
±1.0
2.0
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
5.3
2.8
2.40
-2.48 -2.40
2.48
Power
Dissipation
PD
ALD4701A/ALD4701B
ALD4701
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
-0.3
-2.8
7
VO low
VO high
IS
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
5
0.001
4.999
Supply
Current
mV
mV
5
4.99
ISC
10.0
11.0
1012
10
0.01
1
2.40
Ω
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
0.01
V
V
R L = 1MΩ V+ = 5V
0°C ≤ TA ≤ +70°C
-2.40
V
V
R L = 100KΩ VS = ±2.5V
0°C ≤ TA ≤ +70°C
7
0.001
4.99 4.999
0.01
0.001
4.99 4.999
-2.48 -2.40
2.48
2.40
1
-2.48
2.48
1
480 1000
480 1000
5.0
5.0
Test
Conditions
Dual Supply
Single Supply
10 12
VO low
VO high
Output Short
Circuit Current
5.3
2.8
Unit
V
V
5.0
5.8
-0.3
-2.8
Max
±6.0
12.0
1012
10
Output
Voltage
Range
4701
Typ
±6.0 ±1.0
12.0 2.0
2.0
2.8
-0.3
-2.8
Min
Advanced Linear Devices
480
mA
1000
5.0
µA
mW
VIN = 0V
No Load
All amplifiers
VS = ±2.5V
2
OPERATING ELECTRICAL CHARACTERISTICS (cont'd)
TA = 25 °C VS = ±2.5V unless otherwise specified
Min
4701A
Typ
Min
Max
Min
4701
Typ
Max
Unit
Test
Conditions
Symbol
Input
Capacitance
CIN
1
1
1
Bandwidth
BW
700
700
700
KHz
Slew Rate
SR
0.7
0.7
0.7
V/µs
AV = +1
RL = 100KΩ
Rise time
tr
0.2
0.2
0.2
µs
RL = 100KΩ
20
20
20
%
RL = 100KΩ
CL = 50pF
Overshoot
Factor
Max
4701B
Typ
Parameter
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
4701A
Min
Typ
4701B
Min
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 = 100KΩ
Max
Min
V
R L = 100KΩ
VO low
Bandwidth
BW
1.0
1.0
1.0
MHz
Slew Rate
SR
1.0
1.0
1.0
V/µs
4.98
4.90
-4.90
Unit
VO high
4.90
-4.98
Max
Range
4.98
-4.98 -4.90
Typ
Output Voltage
4.90
-4.90
Typ
Test
Symbol
-4.98
Max
4701
Parameter
4.98
Conditions
V
AV = +1
CL = 50pF
VS = ±2.5V -55°C ≤ T A ≤ +125°C unless otherwise specified
4701 DB
Typ
Max
Unit
6.0
15.0
mV
8.0
8.0
8.0
nA
10.0
10.0
10.0
nA
Min
4701B DB
Typ Max
Input Offset
Voltage
VOS
3.0
Input Offset
Current
I OS
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
2.35
-2.47
2.45
V
V
RL = 100KΩ
-2.40
Min
Test
Conditions
Symbol
ALD4701A/ALD4701B
ALD4701
Min
4701A DB
Typ Max
Parameter
-2.40
Advanced Linear Devices
-2.40
RS ≤ 100KΩ
3
Design & Operating Notes:
1. The ALD4701 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 ALD4701 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 ALD4701 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 ALD4701 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 ALD4701 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 ALD4701, 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 0.4°C
above ambient temperature under most operating conditions.
TYPICAL PERFORMANCE CHARACTERISTICS
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
OPEN LOOP VOLTAGE GAIN AS A
FUNCTION OF LOAD RESISTANCE
1600
-25°C
OPEN LOOP VOLTAGE
GAIN (V/mV)
SUPPLY CURRENT (µA)
1000
+25°C
INPUTS GROUNDED
OUTPUT UNLOADED
TA = -55°C
1200
800
+70°C
+125°C
400
±1
±2
±3
±4
±5
10
VS = ±2.5V
TA = 25°C
1
10K
0
0
100
±6
100K
10M
INPUT BIAS CURRENT AS A FUNCTION
OF AMBIENT TEMPERATURE
COMMON MODE INPUT VOLTAGE RANGE
AS A FUNCTION OF SUPPLY VOLTAGE
10000
±6
INPUT BIAS CURRENT (pA)
±7
COMMON MODE INPUT
VOLTAGE RANGE (V)
1M
LOAD RESISTANCE (Ω)
SUPPLY VOLTAGE (V)
TA = 25°C
±5
±4
±3
±2
±1
VS = ±2.5V
1000
100
10
1.0
0.1
0
0
±1
±2
±3
±4
±5
±6
±7
-50
ALD4701A/ALD4701B
ALD4701
-25
0
25
50
75
100
125
AMBIENT TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
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
-55°C ≤ TA ≤ +125°C
RL = 100KΩ
±5
±4
±3
±2
±1
1
±2
0
±4
±6
±8
0
±1
±2
±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)
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)
SMALL - SIGNAL TRANSIENT
RESPONSE
LARGE - SIGNAL TRANSIENT
RESPONSE
5V/div
VS = ±2.5V
TA = 25°C
RL = 100KΩ
CL = 50pF
100mV/div
VS = ±2.5V
TA = 25°C
RL = 100KΩ
CL = 50pF
2V/div
5µs/div
20mV/div
2µs/div
ALD4701A/ALD4701B
ALD4701
Advanced Linear Devices
5
TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER
TRANSCONDUCTANCE AMPLIFIER
5V
~ 1012Ω
ZIN =
VOUT
RIN = 1012Ω
0.1µF
-
+5V
+
VIN
RL
VOUT
+
VIN
RL = R2
1/4 ALD4701
0≤ VIN ≤ 5V
VIN
Min
0.0
0.0
1K
10K
HIGH INPUT IMPEDANCE RAIL-TO-RAIL PRECISION
DC SUMMING AMPLIFIER
1/4 ALD4701
VOUT
Max
2.00
2.45
V2
R2
IOUT = VIN
Min Max
0.0 4.00
0.0 4.90
R2
PHOTO DETECTOR CURRENT TO
VOLTAGE CONVERTER
RF = 5M
V+ = +2.5V
V1
IOUT
10M
I
+
10M
0.1µF
1/4 ALD4701
VOUT
10M
-
10M
0.1µF
V- ≤ VOUT ≤ V+
V- = - 2.5V
10M
RL = 100K
+
V- ≤ VIN ≤ V+
V3
V4
VOUT = 1 X RF
+2.5V
-
PHOTODIODE
-2.5V
1/4 ALD4701
10M
VOUT = V1 + V2 - V3 - V4
RIN = 10MΩ Accuracy limited by resistor tolerances and input offset voltage
WIEN BRIDGE OSCILLATOR (RAIL-TO-RAIL)
SINE WAVE GENERATOR
RAIL-TO-RAIL WINDOW COMPARATOR
+5V
-
+5V
100K
VOUT
1/4 ALD4701
+
.01µF
2
10K
-5V
C = .01µF
VREF (HIGH) 3
8
1/4 ALD4701
+
1/4 74 C00
1
VOUT
VIN
5
+
7
10K
10K
R = 10K
VREF (LOW) 6
100K
-
4
1/4 ALD4701
~
f=
~ 1.6KHZ
1
=
2πRC
VOUT (LOW) for VREF (LOW) < VIN < VREF (HIGH)
FUNCTION GENERATOR
0.1µF
100K
2 -
4
.01µF
+
54K
0.002µF
0.002µF
1
10K
6 7
11
3
220K
100K
+2.5V
100K
9 8
+
-2.5V
5
Square
Square
Wave
Wave
1/4 ALD4701
14
10
100K
27K
27K 13 -
+
+
VOUT
12
10K
Triangle
Triangle
Wave
Wave
1/4 ALD4701
100K
Sine Wave
27K
-2X GAIN
1/4 ALD4701
1/4 ALD4701
ALD4701A/ALD4701B
ALD4701
Advanced Linear Devices
6
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