GENERAL DESCRIPTION
The ALD1701 is a 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 250µA maximum at 5V
supply voltage. It is manufactured with Advanced Linear Devices' en-
hanced ACMOS silicon gate CMOS process.
The ALD1701 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 µA741 and ICL7611 types.
The ALD1701 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, the 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, 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 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 tempera-
ture drift, make the ALD1701 a versatile, micropower operational amplifier.
The ALD1701, designed and fabricated with silicon gate CMOS techno-
logy, offers 1pA typical input bias current. On chip offset voltage trimming
allows the device to be used without nulling in most applications.
FEATURES
• 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 --
1.0pA 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 10KΩ load
• Output short circuit protected
• Unity gain bandwidth of 0.7MHz
• Slew rate of 0.7V/µs
• Low power dissipation
MICROPOWER RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
ALD1701A/ALD1701B
ALD1701/ALD1701G
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 internally connected. Do not connect externally.
1
2
2
3
4
8
7
6
5
TOP VIEW
DA, PA, SA PACKAGE
N/C
-IN
+IN
N/C
OUT
N/C
V-
V+
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
ALD1701A DA ALD1701A SA ALD1701A PA
ALD1701B DA ALD1701B SA ALD1701B PA
ALD1701 DA ALD1701 SA ALD1701 PA
ALD1701G DA ALD1701G SA ALD1701G PA
* Contact factory for industrial temperature range
ORDERING INFORMATION
© 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
ALD1701A/ALD1701B Advanced Linear Devices 2
ALD1701/ALD1701G
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
Supply VS±1.0 ±6.0 ±1.0 ±6.0 ±1.0 ±6.0 ±1.0 ±6.0 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 1.0 25 1.0 25 1.0 25 1.0 30 pA TA = 25°C
Current 240 240 240 450 pA 0°C ≤ TA ≤ +70°C
Input Bias IB1.0 30 1.0 30 1.0 30 1.0 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 RIN 1012 1012 1012 1012 Ω
Resistance
Input Offset TCVOS 7777µV/°CR
S
≤ 100KΩ
Voltage Drift
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 AV40 100 32 100 32 100 20 80 V/ mV RL = 100KΩ
Voltage Gain 1000 1000 1000 1000 V/ mV RL ≥ 1MΩ
20 20 20 10 V/ mV RL = 100KΩ
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 V+ = +5V
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 -2.48 -2.40 -2.48 -2.40 -2.48 -2.40 -2.48 -2.40 V RL =100KΩ
VO high 2.40 2.48 2.40 2.48 2.40 2.48 2.40 2.48 V 0°C ≤ TA ≤ +70°C
Output Short ISC 1 1 1 1 mA
Circuit Current
Supply Current IS 120 250 120 250 120 250 120 300 µAV
IN = 0V
No Load
Power PD 1.25 1.25 1.25 1.50 mW VS = ±2.5V
Dissipation
OPERATING ELECTRICAL CHARACTERISTICS
TA = 25°C VS = ±2.5V unless otherwise specified
1701A 1701B 1701 1701G Test
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Min Typ Max Unit Conditions
ALD1701A/ALD1701B Advanced Linear Devices 3
ALD1701/ALD1701G
1701B DA 1701 DA Test
Parameter Symbol Min Typ Max Min Typ Max Unit Conditions
VS = ±2.5V -55°C ≤ TA ≤ +125°C unless otherwise specified
Input Offset VOS 3.0 6.5 mV RS ≤ 100KΩ
Voltage
Input Offset IOS 8.0 8.0 nA
Current
Input Bias IB10.0 10.0 nA
Current
Power Supply PSRR 60 75 60 75 dB RS ≤ 100KΩ
Rejection Ratio
Common Mode CMRR 60 83 60 83 dB RS ≤ 100KΩ
Rejection Ratio
Large Signal AV15 50 15 50 V/ mV RL = 100KΩ
Voltage Gain
Output Voltage VO low -2.47 -2.40 -2.47 -2.40 V
Range VO high 2.35 2.45 2.35 2.45 V RL = 100KΩ
Input CIN 11 11pF
Capacitance
Bandwidth BW400 700 400 700 400 700 700 KHz
Slew Rate SR0.33 0.7 0.33 0.7 0.33 0.7 0.7 V/µsA
V
= +1
RL = 100KΩ
Rise time t r 0.2 0.2 0.2 0.2 µsR
L
= 100KΩ
Overshoot 20 20 20 20 % RL =100KΩ
Factor CL = 50pF
Settling Time t s10.0 10.0 10.0 10.0 µs 0.1%
AV = -1RL=100KΩ
CL = 50pF
OPERATING ELECTRICAL CHARACTERISTICS (cont'd)
TA = 25°C VS = ±2.5V unless otherwise specified
1701A 1701B 1701 1701G Test
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Min Typ Max Unit Conditions
Power Supply PSRR 83 83 83 83 dB RS ≤ 100KΩ
Rejection Ratio
Common Mode CMRR 83 83 83 83 dB RS ≤ 100KΩ
Rejection Ratio
Large Signal AV250 250 250 250 V/mV RL =100KΩ
Voltage Gain
Output Voltage VO low -4.98 -4.90 -4.98 -4.90 -4.98 -4.90 -4.98 -4.90 V RL =100KΩ
Range VO high 4.90 4.98 4.90 4.98 4.90 4.98 4.90 4.98 V
Bandwidth BW1.0 1.0 1.0 1.0 MHz
Slew Rate SR1.0 1.0 1.0 1.0 V/µsA
V
= +1
CL = 50pF
TA = 25°C VS = ±5.0V unless otherwise specified
1701A 1701B 1701 1701G Test
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Min Typ Max Unit Conditions
ALD1701A/ALD1701B Advanced Linear Devices 4
ALD1701/ALD1701G
Design & Operating Notes:
1. The ALD1701 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 opera-
tional amplifier. The ALD1701 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 ALD1701 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 compa-
tibility 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 ALD1701 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 excur-
sions 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 transis-
tors 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 ALD1701 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 ALD1701, with its micropower operation, offers numerous
benefits in reduced power supply requirements, less noise coupling
and current spikes, less thermally induced drift, better overall reli-
ability 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 0.1°C above ambient temperature under most operating condi-
tions.
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
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
SUPPLY CURRENT (µA)
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
±500
±400
±200
±300
0
±100
0±1±2±3±4±5±6
T
A
= -55°C
-25°C+25°C
+70°C
+125°C
INPUTS GROUNDED
OUTPUT UNLOADED
OPEN LOOP VOLTAGE GAIN AS A
FUNCTION 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
ALD1701A/ALD1701B Advanced Linear Devices 5
ALD1701/ALD1701G
TYPICAL PERFORMANCE CHARACTERISTICS
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 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
LARGE - SIGNAL TRANSIENT
RESPONSE
2V/div
500mV/div 5µs/div
VS = ±1.0V
TA = 25°C
RL = 100KΩ
CL = 50pF
LARGE - SIGNAL TRANSIENT
RESPONSE
5V/div
2V/div 5µs/div
V
S
= ±2.5V
T
A
= 25°C
R
L
= 100KΩ
C
L
= 50pF
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
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
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)
90
0
45
180
135
PHASE SHIFT IN DEGREES
V
S
= ±2.5V
T
A
= 25°C
SMALL - SIGNAL TRANSIENT
RESPONSE
100mV/div
20mV/div 2µs/div
V
S
= ±2.5V
T
A
= 25°C
R
L
= 100KΩ
C
L
= 50pF
ALD1701A/ALD1701B Advanced Linear Devices 6
ALD1701/ALD1701G
TYPICAL APPLICATIONS
Performance waveforms.
Upper trace is the output of a
Wien Bridge Oscillator. Lower
trace is the output of Rail-to-rail
voltage follower.
0V
+5V
OUTPUT
0V
+5V
INPUT
RAIL-TO-RAIL WAVEFORM
RAIL-TO-RAIL VOLTAGE COMPARATORWIEN BRIDGE OSCILLATOR (RAIL-TO-RAIL)
SINE WAVE GENERATOR
LOW VOLTAGE INSTRUMENTATION AMPLIFIER
-
+
OUTPUT
50K
0.1µF
+5V
10M
+5V
VIN
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER
HIGH INPUT IMPEDANCE RAIL-TO-RAIL
PRECISION DC SUMMING AMPLIFIER
- 2.5V
10M
10M
10M
10M
10M
10M
R
IN
= 10MΩ Accuracy limited by resistor tolerances and input offset voltage
+2.5V
-
+
0.1µF
0.1µFV
OUT
V- ≤ V
IN
≤ V+
V- ≤ V
OUT
≤ V+
V
1
V
4
V
3
V
2
V
OUT
= V
1
+ V
2
- V
3
- V
4
+
-+2.5V
-2.5V
R
F
= 5M
I
PHOTODIODE
V
OUT
= 1 X R
F
R
L
= 100K
PHOTO DETECTOR CURRENT TO
VOLTAGE CONVERTER
-
+
OUTPUT
5V
0.1µF
* See Rail to Rail Waveform
0≤ V
IN
≤ 5V
V
IN
Z
IN
= 10
12
Ω
~
10K
-
+
OUTPUT
10K
10K
+2.5V
-2.5V
.01µF
1
2πR
C
f = ~ 1.6KHz
C = .01µFR = 10K
* See Rail to Rail Waveform
~
50K
100K
100K
f max = 20KHz
-40mV ≤ V
IN
≤ 40mV
0.1µF
0.1µF
V+
V-
GAIN = 25 V- ≤ V
OUT
≤ V+. All resistors are 1%.
V+ = +1.0V, V- = -1.0V. Short circuit input current 1µA.
-
+
V-
-
+
100K
100K
1M
0.1µF
V+
0.1µF
-
500K
0.1µF
V+
V+ 1M
+
1M V-
V- 0.1µF
V
OUT
1M
