ALD ALD1706BDA Ultra micropower rail to rail cmos operational amplifier Datasheet

ADVANCED
LINEAR
DEVICES, INC.
ALD1706A/ALD1706B
ALD1706/ALD1706G
ULTRA MICROPOWER RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
FEATURES
The ALD1706 is a monolithic CMOS ultra micropower high slew-rate, high
performance 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 40µA
maximum at 5V supply voltage. It is manufactured with Advanced Linear
Devices' enhanced ACMOS silicon gate CMOS process.
• 20µA supply current
• All parameters specified for +5V single
supply or ± 2.5V dual supply systems
• Rail to rail input and output voltage ranges
• No frequency compensation required -unity gain stable
• Extremely low input bias currents -- 0.1pA
typical (30pA max.)
• Ideal for high source impedance applications
• Dual power supply ±1.0V to ±6.0V operation
• Single power supply +2V to +12V operation
• High voltage gain – typically 100V/mV
@ ±2.5V (100dB)
• Drive as low as a 20KΩ load
• Output short circuit protected
• Unity gain bandwidth of 0.4MHz
• Slew rate of 0.17V/µs
The ALD1706 is designed to offer high performance for a wide range of
applications requiring very low power dissipation. It offers the popular
industry standard single operational amplifier pin configuration.
The ALD1706 has been developed specifically for the +5V single battery
or ±1V to ±6V dual battery user. Several important characteristics of the
device make application easier to implement at those voltages. First, the
operational amplifier can operate with rail to rail input and output voltages.
This means the signal input voltage and output voltage can be close to or
equal to the positive and negative supply voltages. This feature allows
numerous analog serial stages and flexibility in input signal bias levels.
Secondly, the 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 25pF capacitive
and 20KΩ resistive loads. These features, combined with extremely low
input currents, high open loop voltage gain of 100V/mV, useful bandwidth
of 400KHz, a slew rate of 0.17V/µs, low offset voltage and temperature drift,
make the ALD1706 a versatile, micropower operational amplifier.
The ALD1706, designed and fabricated with silicon gate CMOS technology, offers 0.1pA typical input bias current. On chip offset voltage trimming
allows the device to be used without nulling in most applications.
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 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
ALD1706A DA
ALD1706B DA
ALD1706 DA
ALD1706A SA
ALD1706B SA
ALD1706 SA
ALD1706A PA
ALD1706B PA
ALD1706 PA
ALD1706G PA
* Contact factory for industrial temperature range
N/C
1
8
N/C
-IN
2
7
V+
+IN
3
6
OUT
V-
4
5
N/C
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
TA = 25°C VS = ±2.5V unless otherwise specified
Parameter
Symbol Min
1706A
Typ
Max
±1.0
2.0
±6.0
12.0
Min
1706B
Typ
Max
Min
1706
Typ Max
Min
1706G
Typ
Max
±6.0
12.0
±1.0
2.0
±6.0
12.0
±1.0
2.0
±6.0
12.0
V
V
Dual Supply
Single Supply
10.0
11.0
mV
mV
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
±1.0
2.0
Unit
Test
Conditions
Supply
Voltage
VS
V+
Input Offset
Voltage
VOS
Input Offset
Current
IOS
0.1
25
240
0.1
25
240
0.1
25
240
0.1
30
450
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
Input Bias
Current
IB
0.1
30
300
0.1
30
300
0.1
30
300
0.1
50
600
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
Input Voltage
Range
VIR
5.3
2.8
V
V
V+ = +5V
VS = ±2.5V
Input
Resistance
RIN
Input Offset
Voltage Drift
TCVOS
0.9
1.7
-0.3
-2.8
5.3
2.8
2.0
2.8
-0.3
-2.8
5.3
2.8
4.5
5.3
-0.3
-2.8
5.3
2.8
-0.3
-2.8
Ω
1012
1012
1012
1012
7
7
7
10
µV/°C
RS ≤ 100KΩ
Power Supply PSRR
Rejection Ratio
70
70
80
80
65
65
80
80
65
65
80
80
60
60
80
80
dB
dB
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
Common Mode CMRR
Rejection Ratio
70
70
83
83
65
65
83
83
65
65
83
83
60
60
83
83
dB
dB
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
Large Signal
Voltage Gain
AV
32
20
100
32
20
100
32
20
100
20
10
80
V/ mV
V/ mV
RL = 1MΩ
RL = 1MΩ
0°C ≤ TA ≤ +70°C
Output
Voltage
Range
VO low
VO high 4.99
VO low
VO high 2.30
Output Short
Circuit Current
ISC
Supply Current IS
Power
Dissipation
PD
ALD1706A/ALD1706B
ALD1706/ALD1706G
0.001
4.999
-2.40
2.40
0.01
4.99
-2.30
2.30
200
20
0.001 0.01
4.999
-2.40 -2.30
2.40
200
40
200
20
4.99
2.30
0.001 0.01
4.999
-2.40 -2.30
2.40
200
40
20
200
Advanced Linear Devices
40
200
4.99
2.30
0.001 0.01
4.999
-2.40 -2.30
2.40
V
V
V
V
200
µA
20
RL =1MΩ
0°C ≤ TA ≤ +70°C
R L =100KΩ
0°C ≤ TA ≤ +70°C
50
µA
VIN = 0V
No Load
250
µW
VS = ±2.5V
2
OPERATING ELECTRICAL CHARACTERISTICS (cont'd)
TA = 25°C VS = ±2.5V unless otherwise specified
Min
1706A
Typ
Max
Min
Unit
Test
Condition
1
1
1
1
Bandwidth
BW
400
400
400
400
KHz
Slew Rate
SR
0.17
0.17
0.17
0.17
V/µs
AV = +1
RL = 1MΩ
Rise time
tr
1.0
1.0
1.0
1.0
µs
RL = 1MΩ
20
20
20
20
%
RL =1MΩ
CL = 25pF
10.0
10.0
10.0
10.0
µs
0.1%
AV = -1 RL=1MΩ
CL =25pF
ts
Max
1706G
Typ Max
CIN
Settling Time
Min
1706
Typ
Symbol
Overshoot
Factor
Min
1706B
Typ
Max
Parameter
Input
Capacitance
pF
T A = 25°C VS = ±1.0V unless otherwise specified
Parameter
Symbol
Min
1706A
Typ
Max
Min
1706B
Typ
Max
Min
1706
Typ
Max
Min
1706G
Typ Max
Unit
Test
Condition
Power Supply
PSRR
70
70
70
70
dB
RS ≤ 1MΩ
Rejection Ratio
CMRR
70
70
70
70
dB
RS ≤ 1MΩ
Large Signal
Voltage Gain
AV
50
50
50
50
V/ mV
RL =1MΩ
V
V
R L =1MΩ
Rejectio Ratio
Common Mode
Output Voltage
Range
VO low
VO high
Bandwidth
BW
0.3
0.3
0.3
0.3
MHz
Slew Rate
SR
0.17
0.17
0.17
0.17
V/µs
0.9
-0.95
0.95
-0.9
0.9
-0.95
0.95
-0.9
0.9
-0.95
0.95
-0.9
0.9
-0.95
0.95
-0.9
AV = +1
CL = 25pF
V S = ±2.5V -55°C ≤ TA ≤ +125°C unless otherwise specified
1706B DA
Parameter
Symbol
Input Offset
Voltage
VOS
Input Offset
Current
IOS
Min
Typ
1706 DA
Max
Min
Typ
Test
Max
Unit
3.0
6.5
mV
8.0
8.0
nA
10.0
10.0
nA
Conditions
RS ≤ 100KΩ
Input Bias
Current
IB
Power Supply
Rejection Ratio
PSRR
60
75
60
75
dB
RS ≤ 1MΩ
Rejection Ratio
CMRR
60
83
60
83
dB
RS ≤ 1MΩ
Large Signal
Voltage Gain
AV
15
50
V/ mV
RL = 1MΩ
Output Voltage
Range
VO low
VO high
2.30
-2.40
2.40
V
V
RL = 1MΩ
Common Mode
ALD1706A/ALD1706B
ALD1706/ALD1706G
15
50
2.30
-2.40
2.40
-2.30
Advanced Linear Devices
-2.30
3
Design & Operating Notes:
1. The ALD1706 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 ALD1706 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 ALD1706 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
ALD1706 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 noninverting 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 ALD1706 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.
6. The ALD1706, 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
less than 0.1°C above ambient temperature under most operating
conditions.
TYPICAL PERFORMANCE CHARACTERISTICS
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
COMMON MODE INPUT VOLTAGE RANGE
AS A FUNCTION OF SUPPLY VOLTAGE
±7
INPUTS GROUNDED
OUTPUT UNLOADED
-25°C +25°C
COMMON MODE INPUT
VOLTAGE RANGE (V)
SUPPLY CURRENT (µA)
100
80
TA = -55°C
60
40
20
+70°C
±6
TA = 25°C
±5
±4
±3
±2
±1
+125°C
0
0
0
±1
±2
±3
±4
±5
±6
±1
0
SUPPLY VOLTAGE (V)
±4
±5
±6
±7
INPUT BIAS CURRENT AS A FUNCTION
OF AMBIENT TEMPERATURE
1000
10000
INPUT BIAS CURRENT (pA)
OPEN LOOP VOLTAGE
GAIN (V/mV)
±3
SUPPLY VOLTAGE (V)
OPEN LOOP VOLTAGE GAIN AS AFUNCTION
OF LOAD RESISTANCE
100
10
VS = ±2.5V
TA = 25°C
1
10K
±2
VS = ±2.5V
1000
100
10
1.0
0.1
100K
1M
10M
-50
ALD1706A/ALD1706B
ALD1706/ALD1706G
-25
0
25
50
75
100
125
AMBIENT TEMPERATURE (°C)
LOAD RESISTANCE (Ω)
Advanced Linear Devices
4
TYPICAL PERFORMANCE CHARACTERISTICS
OPEN LOOP VOLTAGE GAIN AS A FUNCTION
OF SUPPLY VOLTAGE AND TEMPERATURE
OUTPUT VOLTAGE SWING AS A FUNCTION
OF SUPPLY VOLTAGE
OUTPUT VOLTAGE SWING (V)
OPEN LOOP VOLTAGE
GAIN (V/mV)
1000
100
10
±55°C ≤ TA ≤ +125°C
RL = 100KΩ
±25°C ≤ TA ≤ +125°C
RL = 100KΩ
±5
±4
±3
±2
±1
1
±2
0
±4
±6
±8
0
±1
±3
±4
±5
±6
SUPPLY VOLTAGE (V)
INPUT OFFSET VOLTAGE AS A FUNCTION
OF AMBIENT TEMPERATURE
REPRESENTATIVE UNITS
OPEN LOOP VOLTAGE GAIN AS
A FUNCTION OF FREQUENCY
±7
VS = ±2.5V
+3
+2
+1
0
-1
-2
-3
-4
OPEN LOOP VOLTAGE
GAIN (dB)
120
+5
+4
-5
-50
VS = ±2.5V
TA = 25°C
100
80
60
0
40
45
20
90
0
135
180
-20
-25
0
+25
+50
+75
+100 +125
1
10
AMBIENT TEMPERATURE (°C)
INPUT OFFSET VOLTAGE AS A FUNCTION
OF COMMON MODE INPUT VOLTAGE
INPUT OFFSET VOLTAGE (mV)
±2
SUPPLY VOLTAGE (V)
100
1K
10K 100K
FREQUENCY (Hz)
1M
PHASE SHIFT IN DEGREES
INPUT OFFSET VOLTAGE (mV)
±6
10M
LARGE - SIGNAL TRANSIENT
RESPONSE
15
VS = ±2.5V
TA = 25°C
10
2V/div
VS = ±1.0V
TA = 25°C
RL = 100KΩ
CL= 25pF
500mV/div
10µs/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
2V/div
ALD1706A/ALD1706B
ALD1706/ALD1706G
VS = ±2.5V
TA = 25°C
RL = 100KΩ
CL= 25pF
100mV/div
50mV/div
10µs/div
Advanced Linear Devices
VS = ±2.5V
TA = 25°C
RL = 100KΩ
CL= 25pF
10µs/div
5
TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER
CHARGE INTEGRATOR
1000pF
5V
~ 1012Ω
ZIN =
0.1µF
-
+2.5V
1M
VIN
OUTPUT
VOUT
+
VIN
+
-2.5V
0≤ VIN ≤ 5V
* See Rail to Rail Waveform
HIGH INPUT IMPEDANCE RAIL-TO-RAIL PRECISION
DC SUMMING AMPLIFIER
RAIL-TO-RAIL VOLTAGE COMPARATOR
V+ = +2.5V
V1
+5V
10M
VIN
+
10M
+5V
VOUT
10M
-
10M
0.1µF
-
0.1µF
V2
0.1µF
OUTPUT
+
50K
V3
V4
10M
V- ≤ VOUT ≤ V+
V- = - 2.5V
10M
0 ≤ VIN ≤ V+
10M
VOUT = V1 + V2 - V3 - V4
RIN = 10MΩ Accuracy limited by resistor tolerances and input offset voltage
HIGH IMPEDANCE NON-INVERTING AMPLIFIER
PHOTO DETECTOR CURRENT TO
VOLTAGE CONVERTER
RF = 5M
900K
100K
I
+1V
VOUT
VIN
+
RL = 100K
+
-2.5V
-1V
WIEN BRIDGE OSCILLATOR
MICROPOWER BUFFERED VARIABLE
VOLTAGE SOURCE
250K
V+
V+
+1.0V
VIN
VOUT
+
0.0015µF
C
VOUT = 1 X RF
+2.5V
-
PHOTODIODE
2M
VOUT
+
1µF
-1.0V
Power Supply = ±1.0V
0.0015µF 100K
R
C
100K
R
f≈
1
2.0V ≤ V+ ≤ 12.0V
0.1 ≤ VOUT ≤ (V+ - 0.1) V
OUPUT CURRENT ±200µA
≈ 1.0KHz
2π RC
VOUT = SINEWAVE 2V Peak to Peak
ALD1706A/ALD1706B
ALD1706/ALD1706G
Advanced Linear Devices
6
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