ALD ALD1712 Rail-to-rail precision operational amplifier Datasheet

ADVANCED
LINEAR
DEVICES, INC.
ALD1712A/ALD1712B
ALD1712
RAIL-TO-RAIL PRECISION OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
FEATURES
The ALD1712 is a monolithic precision operational amplifier intended
primarily for a wide range of analog applications in +5V single power supply
and ±5V dual power supply systems as well as +6V to 12V 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 and is available as
a standard cell in ALD's ASIC "Function-Specific" library.
• Linear mode operation with input voltages
300mV beyond supply rails
• Symmetrical complementary output drive
• Output voltages to within 2mV of power
supply rails
• High load capacitance capability -4000pF typical
• No frequency compensation required -unity gain stable
• Extremely low input bias currents -0.01pA typical
• Dual power supply ±2.5V to ±6.0V
• Single power supply +5V to +12V
• High voltage gain – typically 85V/mV
@ ±2.5V and 250V/mV @ ±5.0V
• Drive as low as 1KΩ load with 5mA
drive current
• Output short circuit protected
• Unity gain bandwidth of 1.5MHz
• Slew rate of 2.1V/µs
The device has an input stage that operates to +300mV above and -300mV
below the supply voltages with no adverse effects and/or phase reversals.
The ALD1712 has been developed specifically with the 5V single supply or
±2.5V dual supply user in mind. 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 1KΩ resistive loads in
non-inverting unity gain connection, and up to 4000pF at a gain of 5. 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 ALD1712 a truly
versatile, user friendly, operational amplifier.
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 5µV/
°C which eliminates many trim or temperature compensation circuits. For
precision applications, the 1712 is designed to settle to 0.01% in 8µs. The
unique characteristics at input and output are modeled in an available
macromodel.
Operating Temperature Range
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 1712A DA
ALD 1712B DA
ALD 1712 DA
ALD 1712 ASA
ALD 1712 BSA
ALD 1712 SA
ALD 1712A PA
ALD 1712B PA
ALD 1712 PA
* Contact factory for industrial temperature range
•
•
•
•
•
•
•
•
•
•
•
•
•
•
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
-55°C to +125°C
APPLICATIONS
8
N/C
7
VS
3
6
OUT
4
5
N/C
N/C
1
-IN
2
+IN
V-
2
TOP VIEW
DA, PA, SA PACKAGE
* N/C Pin is connected internally. Do not connect externally.
© 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
T A = 25 °C VS = ±2.5V unless otherwise specified
Min
1712A
Typ
Supply
Voltage
VS
V+
Input Offset
Voltage
VOS
0.05
0.15
0.35
0.1
0.25
0.55
0.25
Input Offset
Current
IOS
0.01
10
280
0.01
10
280
Input Bias
Current
IB
0.01
10
280
0.01
10
280
Input Voltage
Range
VIR
Input
Resistance
RIN
Input Offset
Voltage Drift
TCV OS
Power Supply
Rejection Ratio
PSRR
65
65
85
85
65
65
85
85
63
63
Common Mode
Rejection Ratio
CMRR
65
65
83
83
65
65
83
83
Large Signal
Voltage Gain
AV
50
85
400
50
85
400
-0.3
-2.8
Min
±6.0
12.0
±2.0
4.0
5.3
+2.8
VO low
VO high
VO low
VO high
4.99
2.35
±6.0 ±2.0
12.0 4.0
-0.3
-2.8
5.3
+2.8
0.5
1.0
mV
mV
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
0.01
10
280
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
0.01
10
280
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
5.3
+2.8
V
V
V+ = +5; notes 2,5
VS = ±2.5V
-0.3
-2.8
5
5
5
Ω
µV/°C
RS ≤ 100KΩ
85
85
dB
dB
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
63
63
83
83
dB
dB
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
50
85
400
V/mV
V/mV
V/mV
RL = 10KΩ
RL ≥ 1MΩ
RL = 10KΩ
0°C ≤ TA ≤ +70°C
V
V
V
V
RL = 1MΩ V+ = +5V
0°C ≤ TA ≤ +70°C
RL = 10KΩ
0°C ≤ TA ≤ +70°C
20
0.002 0.01
0.002 0.01
4.99 4.998
4.99 4.998
-2.44 -2.35
-2.44 -2.35
2.35 2.44
2.35 2.44
8
Test Conditions
Single Supply
10 13
0.002 0.01
4.998
-2.44 -2.35
2.44
Unit
V
1013
20
Max
±6.0
12.0
1013
20
Output
Voltage
Range
Min
1712
Typ
Symbol
±2.0
4.0
Max
1712B
Typ Max
Parameter
8
8
mA
Output Short
Circuit Current
ISC
Supply
Current
IS
0.8
1.5
0.8
1.5
0.8
1.5
mA
VIN = 0V
No Load
Power
Dissipation
PD
4.0
7.5
4.0
7.5
4.0
7.5
mW
VS = ±2.5V
Input
Capacitance
CIN
Bandwidth
BW
1.0
1.5
1.0
1.5
1.0
1.5
MHz
Slew Rate
SR
1.4
2.1
1.4
2.1
1.4
2.1
V/µs
AV = +1
RL = 10KΩ
Rise time
tr
Overshoot
Factor
ALD1712A/ALD1712B
ALD1712
1
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)
TA = 25°C VS = ±2.5V unless otherwise specified
1712A
Typ
Max
Min
Typ
1712
Symbol
Maximum Load
Capacitance
CL
400
4000
400
4000
400
4000
Input Noise
Voltage
en
26
26
26
nV/√Hz f =1KHz
Input Current
Noise
in
0.6
0.6
0.6
fA/√Hz
f =10Hz
ts
8.0
3.0
8.0
3.0
8.0
3.0
µs
µs
0.01%
0.1% AV = -1
RL = 5KΩ CL = 50pF
Unit
Test Conditions
Settling
Time
Min
1712B
Parameter
Max
Min
Typ
Max
Unit
Test Conditions
pF
pF
Gain = 1
Gain = 5
TA = 25 °C VS = ±5.0V unless otherwise specified
Min
1712A
Typ
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
-4.80
4.80
-4.90
4.93
Max
-4.80
Min
1712
Typ
Symbol
4.80
Max
1712B
Typ
Parameter
-4.90
4.80 4.93
Max
-4.80
AV =+1
CL =50pF
V S = ±2.5V -55°C ≤ TA ≤ +125°C unless otherwise specified
VOS
Input Offset
Current
IOS
4.0
Input Bias
Current
IB
4.0
Power Supply
Rejection Ratio
PSRR
60
83
60
83
60
83
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
10
25
V/mV
RL = 10KΩ
Output Voltage
Range
VO low
VO high
4.8
0.1
4.9
4.8
0.1
4.9
4.8
0.1
4.9
V
V
RL ≤ 10KΩ
RL ≤ 10KΩ
1.0
0.8
0.2
Min
1712 DA
Typ
Max
Input Offset
Voltage
0.5
Min
1712B DA
Typ Max
Symbol
ALD1712A/ALD1712B
ALD1712
Min
1712A DA
Typ Max
Parameter
Unit
Test Conditions
2.5
mV
RS ≤ 100KΩ
4.0
4.0
nA
4.0
4.0
nA
1.5
1.2
0.2
Advanced Linear Devices
0.2
3
Design & Operating Notes:
1. The ALD1712 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 ALD1712 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 ALD1712 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
ALD1712 has shown itself to be more resistant to parasitic oscillations.
2. The ALD1712 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 1712 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 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 ALD1712 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
OPEN LOOP VOLTAGE GAIN AS A FUNCTION
OF SUPPLY VOLTAGE AND TEMPERATURE
1000
±6
TA = 25°C
OPEN LOOP VOLTAGE
GAIN (V/mV)
COMMON MODE INPUT
VOLTAGE RANGE (V)
±7
±5
±4
±3
±2
} +25°C
100
} +125°C
10
±1
RL= 10KΩ
RL= 5KΩ
0
1
±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
5
1000
VS = ±2.5V
100
SUPPLY CURRENT (mA)
INPUT BIAS CURRENT (pA)
} -55°C
10
1.0
0.1
INPUTS GROUNDED
OUTPUT UNLOADED
4
3
2
TA = -55°C
-25°C
1
+25°C
+80°C
+125°C
0
0.01
-50
-25
0
25
50
75
100
125
0
AMBIENT TEMPERATURE (°C)
ALD1712A/ALD1712B
ALD1712
±1
±2
±3
±4
±5
±6
SUPPLY VOLTAGE (V)
Advanced Linear Devices
4
TYPICAL PERFORMANCE CHARACTERISTICS
±7
120
OPEN LOOP VOLTAGE
GAIN (db)
±25°C ≤ TA ≤ 125°C
±6
RL = 10KΩ
±5
RL = 10KΩ
±4
RL = 2KΩ
±3
±2
100
VS = ±2.5V
TA = 25°C
80
60
0
40
45
20
90
0
135
180
-20
0
±1
±2
±3
±4
±5
±6
1
±7
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
INPUT OFFSET VOLTAGE (mV)
INPUT OFFSET VOLTAGE (mV)
10K
FREQUENCY (Hz)
SUPPLY VOLTAGE (V)
+5
+4
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
VS = ±2.5V
+3
+2
+1
0
-1
-2
-3
-4
6
VS = ±2.5V
TA = 25°C
4
2
0
-2
-4
-6
-5
-50
-25
0
+25
+50
+75
+100 +125
-2
-1
0
+1
+2
AMBIENT TEMPERATURE (°C)
COMMON MODE INPUT VOLTAGE (V)
OPEN LOOP VOLTAGE GAIN AS A
FUNCTION OF LOAD RESISTANCE
LARGE - SIGNAL TRANSIENT
RESPONSE
+3
1000
OPEN LOOP VOLTAGE
GAIN (V/mV)
5V/div
VS = ±2.5V
TA = 25°C
RL = 10KΩ
CL = 50pF
100
VS = ±2.5V
TA = 25°C
10
1V/div
2µs/div
1
1K
10K
100K
1000K
LOAD RESISTANCE (Ω)
SMALL - SIGNAL TRANSIENT
RESPONSE
VOLTAGE NOISE DENSITY AS A
FUNCTION OF FREQUENCY
VOLTAGE NOISE DENSITY
(nV/ √ Hz)
150
100mV/div
125
VS = ±2.5V
TA = 25°C
100
VS = ±2.5V
TA = 25°C
RL = 10KΩ
CL = 50pF
75
50
25
20mV/div
2µs/div
0
10
100
1K
10K
100K
1000K
FREQUENCY (Hz)
ALD1712A/ALD1712B
ALD1712
Advanced Linear Devices
5
TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER
RAIL-TO-RAIL WAVEFORM
5V
ZIN =~ 1012Ω
0.1µF
INPUT
VIN
0V
OUTPUT
CL
+
+5V
+5V
OUTPUT
0V
RL =10KΩ
400pF
0 ≤ VIN ≤ 5V
Performance waveforms.
* See rail to rail waveform
Upper trace is the output of a Wien Bridge
Oscillator. Lower trace is the output of Railto-Rail voltage follower.
LOW OFFSET SUMMING AMPLIFIER
PHOTO DETECTOR CURRENT TO
VOLTAGE CONVERTER
RF = 5M
50K
+2.5V
10K
INPUT 1
INPUT 2
.01µF
I
10K
.01µF
+
+
CL = 4000pF
* Circuit Drives Large Load
Capacitance ≤ 4000pF
RL = 10K
RAIL-TO-RAIL VOLTAGE COMPARATOR
+5V
+2.5V
-
OUTPUT
+
VIN
10K
-2.5V
.01µF
+5V
OUTPUT
1
+
50K
10K
2πRC
0.1µF
-
10K
R = 10K
f =~
-2.5V
- 2.5V
WIEN BRIDGE OSCILLATOR (RAIL-TO-RAIL) SINE
WAVE GENERATOR
C = .01µF
VOUT = I x RF
PHOTODIODE
OUTPUT
GAIN = 5
+2.5V
-
-
~ 1.6KHz
10M
* See rail to rail waveform
ULTRA LONG TIME CONSTANT INTEGRATOR
INTEGRATOR
VOLTAGE
PRESET
20K
20K
5V
Relay 1
2
R
7
-
t2
+
3
+
5V
4
6
t1
1/2 ALD2301
0.1
-5 V
* LOW LEAKAGE CAPACITOR
e.g. TEFLON CAPACITOR TYPE
K11B104KSW Component
Research Inc.
• All capacitance values are in µF unless otherwise specified.
• RELAYS 1 & 2 are of type 4705, Gordos Corporation.
ALD1712A/ALD1712B
ALD1712
1.5V
VIN = dt
ALD1712
3
8
0.1
V = 1/RC
Control 1
-
1
+5V
Relay 2
VIN
1/2 ALD2301
5V
2
C*
Advanced Linear Devices
-
7
4
+
Control 2
6
5
1.5V
6
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