GENERAL DESCRIPTION
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.
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 techno-
logy, offers 0.1 pA typical input bias current. On chip offset voltage trimming
allows the device to be used without nulling in most applications.
FEATURES
•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
ALD1706A/ALD1706B
ALD1706/ALD1706G
ULTRA MICROPOWER RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
ADVANCED
LINEAR
DEVICES, INC.
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
* N/C Pin is connected internally. Do not connect externally.
1
2
3
4
8
7
6
5
TOP VIEW
DA, PA, SA PACKAGE
N/C
-IN
+IN
N/C
OUT
N/C
V+
V-
ORDERING INFORMATION
Operating Temperature Range
-55°C to +125°C0°C to +70°C0°C to +70°C
8-Pin 8-Pin 8-Pin
CERDIP Small Outline Plastic Dip
Package Package (SOIC) Package
ALD1706A DA ALD1706A SA ALD1706A PA
ALD1706B DA ALD1706B SA ALD1706B PA
ALD1706 DA ALD1706 SA ALD1706 PA
ALD1706G PA
* Contact factory for industrial temperature range
© 1998 Advanced Linear Devices, Inc. 415 T asman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1 155 Fax: (408) 747-1286 http://www .aldinc.com
ALD1706A/ALD1706B Advanced Linear Devices 2
ALD1706/ALD1706G
Supply VS±1.0 ±6.0 ±1.0 ±6.0 ±1.0 ±6.0 ±1.0 ±6.0 V Dual Supply
Voltage V+2.0 12.0 2.0 12.0 2.0 12.0 2.0 12.0 V Single Supply
Input Offset VOS 0.9 2.0 4.5 10.0 mV RS ≤ 100KΩ
Voltage 1.7 2.8 5.3 11.0 mV 0°C ≤ TA ≤ +70°C
Input Offset IOS 0.1 25 0.1 25 0.1 25 0.1 30 pA TA = 25°C
Current 240 240 240 450 pA 0°C ≤ TA ≤ +70°C
Input Bias IB0.1 30 0.1 30 0.1 30 0.1 50 pA TA = 25°C
Current 300 300 300 600 pA 0°C ≤ TA ≤ +70°C
Input Voltage VIR -0.3 5.3 -0.3 5.3 -0.3 5.3 -0.3 5.3 V V+ = +5V
Range -2.8 2.8 -2.8 2.8 -2.8 2.8 -2.8 2.8 V VS = ±2.5V
Input
Resistance RIN 1012 1012 1012 1012 Ω
Input Offset
Voltage Drift TCVOS 77 710µV/°CR
S
≤ 100KΩ
Power Supply PSRR 70 80 65 80 65 80 60 80 dB RS ≤ 100KΩ
Rejection Ratio 70 80 65 80 65 80 60 80 dB 0°C ≤ TA ≤ +70°C
Common Mode CMRR 70 83 65 83 65 83 60 83 dB RS ≤ 100KΩ
Rejection Ratio 70 83 65 83 65 83 60 83 dB 0°C ≤ TA ≤ +70°C
Large Signal AV32 100 32 100 32 100 20 80 V/ mV RL = 1MΩ
Voltage Gain 20 20 20 10 V/ mV RL = 1MΩ
0°C ≤ TA ≤ +70°C
Output VO low 0.001 0.01 0.001 0.01 0.001 0.01 0.001 0.01 V RL =1MΩ
Voltage VO high 4.99 4.999 4.99 4.999 4.99 4.999 4.99 4.999 V 0°C ≤ TA ≤ +70°C
Range VO low -2.40 -2.30 -2.40 -2.30 -2.40 -2.30 -2.40 -2.30 V RL =100KΩ
VO high 2.30 2.40 2.30 2.40 2.30 2.40 2.30 2.40 V 0°C ≤ TA ≤ +70°C
Output Short
Circuit Current ISC 200 200 200 200 µA
Supply Current IS 20 40 20 40 20 40 20 50 µAV
IN = 0V
No Load
Power
Dissipation PD 200 200 200 250 µWV
S
= ±2.5V
ABSOLUTE MAXIMUM RATINGS
Supply voltage, V+ 13.2V
Differential input voltage range -0.3V to V+ +0.3V
Power dissipation 600 mW
Operating temperature range PA, SA package 0°C to +70°C
DA package -55°C to +125°C
Storage temperature range -65°C to +150°C
Lead temperature, 10 seconds +260°C
OPERATING ELECTRICAL CHARACTERISTICS
TA = 25°C VS = ±2.5V unless otherwise specified
1706A 1706B 1706 1706G Test
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Min Typ Max Unit Conditions
ALD1706A/ALD1706B Advanced Linear Devices 3
ALD1706/ALD1706G
Input Offset
Voltage VOS 3.0 6.5 mV RS ≤ 100KΩ
Input Offset
Current IOS 8.0 8.0 nA
Input Bias
Current IB10.0 10.0 nA
Power Supply
Rejection Ratio PSRR 60 75 60 75 dB RS ≤ 1MΩ
Common Mode
Rejection Ratio CMRR 60 83 60 83 dB RS ≤ 1MΩ
Large Signal
Voltage Gain AV15 50 15 50 V/ mV RL = 1MΩ
Output Voltage VO low -2.40 -2.30 -2.40 -2.30 V
Range VO high 2.30 2.40 2.30 2.40 V RL = 1MΩ
1706B DA 1706 DA Test
Parameter Symbol Min Typ Max Min Typ Max Unit Conditions
VS = ±2.5V -55°C ≤ TA ≤ +125°C unless otherwise specified
Power Supply
Rejectio Ratio PSRR 70 70 70 70 dB RS ≤ 1MΩ
Common Mode
Rejection Ratio CMRR 70 70 70 70 dB RS ≤ 1MΩ
Large Signal
Voltage Gain AV50 50 50 50 V/ mV RL =1MΩ
Output Voltage VO low -0.95 -0.9 -0.95 -0.9 -0.95 -0.9 -0.95 -0.9 V RL =1MΩ
Range VO high 0.9 0.95 0.9 0.95 0.9 0.95 0.9 0.95 V
Bandwidth BW0.3 0.3 0.3 0.3 MHz
Slew Rate SR0.17 0.17 0.17 0.17 V/µsA
V
= +1
CL = 25pF
TA = 25°C VS = ±1.0V unless otherwise specified
1706A 1706B 1706 1706G Test
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Min Typ Max Unit Condition
OPERATING ELECTRICAL CHARACTERISTICS (cont'd)
TA = 25°C VS = ±2.5V unless otherwise specified
1706A 1706B 1706 1706G Test
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Min Typ Max Unit Condition
Input
Capacitance CIN 1 1 1 1 pF
Bandwidth BW400 400 400 400 KHz
Slew Rate SR0.17 0.17 0.17 0.17 V/µsA
V
= +1
RL = 1MΩ
Rise time t r 1.0 1.0 1.0 1.0 µsR
L
= 1MΩ
Overshoot 20 20 20 20 % RL =1MΩ
Factor CL = 25pF
Settling Time t s10.0 10.0 10.0 10.0 µs 0.1%
AV = -1 RL=1MΩ
CL =25pF
ALD1706A/ALD1706B Advanced Linear Devices 4
ALD1706/ALD1706G
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 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 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
INPUT BIAS CURRENT AS A FUNCTION
OF AMBIENT TEMPERATURE
AMBIENT TEMPERATURE (°C)
1000
100
10
0.1
1.0
INPUT BIAS CURRENT (pA)
100-25 0 75 1255025-50
10000
V
S
= ±2.5V
OPEN LOOP VOLTAGE GAIN AS AFUNCTION
OF LOAD RESISTANCE
10M
LOAD RESISTANCE (Ω)
10K 100K 1M
1000
100
10
1
OPEN LOOP VOLTAGE
GAIN (V/mV)
V
S
= ±2.5V
T
A
= 25°C
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
100
80
40
60
0
20
SUPPLY CURRENT (µA)
0±1±2±3±4±5±6
T
A
= -55°C
-25°C+25°C
+70°C+125°C
INPUTS GROUNDED
OUTPUT UNLOADED
COMMON MODE INPUT VOLTAGE RANGE
AS A FUNCTION OF SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
COMMON MODE INPUT
VOLTAGE RANGE (V)
±7
±6
±5
±4
±3
±2
±1
00 ±1 ±2 ±3 ±4 ±5 ±6 ±7
T
A
= 25°C
ALD1706A/ALD1706B Advanced Linear Devices 5
ALD1706/ALD1706G
TYPICAL PERFORMANCE CHARACTERISTICS
OPEN LOOP VOLTAGE GAIN AS A FUNCTION
OF SUPPLY VOLTAGE AND TEMPERATURE
SUPPLY VOLTAGE (V)
1000
100
10
1
OPEN LOOP VOLTAGE
GAIN (V/mV)
0 ±2 ±4 ±6 ±8
±55°C ≤ T
A
≤ +125°C
R
L
= 100KΩ
OUTPUT VOLTAGE SWING AS A FUNCTION
OF SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
0±1±2±3±4±7±6±5
±6
±5
±4
±3
±2
±1
OUTPUT VOLTAGE SWING (V)
±25°C ≤ T
A
≤ +125°C
R
L
= 100KΩ
INPUT OFFSET VOLTAGE AS A FUNCTION
OF AMBIENT TEMPERATURE
REPRESENTATIVE UNITS
AMBIENT TEMPERATURE (°C)
INPUT OFFSET VOLTAGE (mV)
-50 -25 0 +25 +50 +75 +100 +125
+4
+5
+3
+1
+2
0
-2
-1
-4
-3
-5
V
S
= ±2.5V
INPUT OFFSET VOLTAGE AS A FUNCTION
OF COMMON MODE INPUT VOLTAGE
COMMON MODE INPUT VOLTAGE (V)
-2 -1 0 +1 +3+2
15
10
5
-5
-10
0
-15
INPUT OFFSET VOLTAGE (mV)
V
S
= ±2.5V
T
A
= 25°C
SMALL - SIGNAL TRANSIENT
RESPONSE
100mV/div
50mV/div 10µs/div
V
S
= ±2.5V
T
A
= 25°C
R
L
= 100KΩ
C
L
= 25pF
LARGE - SIGNAL TRANSIENT
RESPONSE
V
S
= ±1.0V
T
A
= 25°C
R
L
= 100KΩ
C
L
= 25pF
2V/div
500mV/div 10µs/div
LARGE - SIGNAL TRANSIENT
RESPONSE
2V/div 10µs/div
5V/div V
S
= ±2.5V
T
A
= 25°C
R
L
= 100KΩ
C
L
= 25pF
OPEN LOOP VOLTAGE GAIN AS
A FUNCTION OF FREQUENCY
FREQUENCY (Hz)
1 10 100 1K 10K 1M 10M100K
120
100
80
60
40
20
0
-20
OPEN LOOP VOLTAGE
GAIN (dB)
V
S
= ±2.5V
T
A
= 25°C
90
0
45
180
135
PHASE SHIFT IN DEGREES
ALD1706A/ALD1706B Advanced Linear Devices 6
ALD1706/ALD1706G
TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER CHARGE INTEGRATOR
+
1000pF
+2.5V
-2.5V
1M
V
OUT
V
IN
HIGH INPUT IMPEDANCE RAIL-TO-RAIL PRECISION
DC SUMMING AMPLIFIER RAIL-TO-RAIL VOLTAGE COMPARATOR
HIGH IMPEDANCE NON-INVERTING AMPLIFIER PHOTO DETECTOR CURRENT TO
VOLTAGE CONVERTER
+
+1V
-1V
900K
100K
V
OUT
V
IN
+
-
+2.5V
-2.5V
R
F
= 5M
I
PHOTODIODE
V
OUT
= 1 X R
F
R
L
= 100K
WIEN BRIDGE OSCILLATOR MICROPOWER BUFFERED VARIABLE
VOLTAGE SOURCE
+
+1.0V
-1.0V
250K
0.0015µF100K
0.0015µF
C100K
R
C
Power Supply = ±1.0V
R
V
OUT
= SINEWAVE 2V Peak to Peak
1
2π R
C
≈ 1.0KHz
f ≈
V
OUT
+
2M
V+
V+
2.0V ≤ V+ ≤ 12.0V
0.1 ≤ V
OUT
≤ (V+ - 0.1) V
OUPUT CURRENT ±200µA
1µFV
OUT
V
IN
-
+
OUTPUT
50K
0.1µF
+5V
10M
+5V
VIN
0 ≤ VIN ≤ V+
V- = - 2.5V
10M
10M
10M
10M
10M
10M
R
IN
= 10MΩ Accuracy limited by resistor tolerances and input offset voltage
V+ = +2.5V
-
+
0.1µF
0.1µFV
OUT
V- ≤ V
OUT
≤ V+
V
1
V
4
V
3
V
2
V
OUT
= V
1
+ V
2
- V
3
- V
4
-
+
OUTPUT
5V
0.1µF
0≤ V
IN
≤ 5V
V
IN
Z
IN
= 10
12
Ω
~
* See Rail to Rail Waveform
