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ADVANCED LINEAR DEVICES, INC.
ALD1701A/ALD1701B ALD1701/ALD1701G
MICROPOWER RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
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 250A maximum at 5V supply voltage. It is manufactured with Advanced Linear Devices' enhanced 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 A741 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 10K 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/s, low power dissipation of 0.5mW, low offset voltage and temperature drift, make the ALD1701 a versatile, micropower operational amplifier. The ALD1701, designed and fabricated with silicon gate CMOS technology, 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 10K load * Output short circuit protected * Unity gain bandwidth of 0.7MHz * Slew rate of 0.7V/s * Low power dissipation 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
-55C to +125C 8-Pin CERDIP Package ALD1701A DA ALD1701B DA ALD1701 DA ALD1701G DA Operating Temperature Range 0C to +70C 0C to +70C 8-Pin Small Outline Package (SOIC) ALD1701A SA ALD1701B SA ALD1701 SA ALD1701G SA 8-Pin Plastic Dip Package ALD1701A PA ALD1701B PA ALD1701 PA ALD1701G PA
N/C -IN +IN V1 2 3 4 TOP VIEW DA, PA, SA PACKAGE
* N/C Pin is internally connected. Do not connect externally.
8 2 7 6 5
N/C V+ OUT N/C
* Contact factory for industrial temperature range
(c) 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 0C to +70C -55C to +125C -65C to +150C +260C
OPERATING ELECTRICAL CHARACTERISTICS TA = 25C VS = 2.5V unless otherwise specified
Parameter Supply Voltage Input Offset Voltage Input Offset Current Input Bias Current Input Voltage Range Input Resistance Input Offset Voltage Drift Power Supply Rejection Ratio Common Mode Rejection Ratio Symbol Min VS V+ VOS 1.0 2.0 1701A Typ Max 6.0 12.0 0.9 1.7 1.0 25 240 30 300 5.3 2.8 1012 -0.3 -2.8 10 12 1.0 Min 1.0 2.0 1701B Typ Max 6.0 12.0 2.0 2.8 25 240 30 300 5.3 2.8 -0.3 -2.8 10 12 1.0 Min 1.0 2.0 1701 Typ Max 6.0 12.0 4.5 5.3 25 240 30 300 5.3 2.8 -0.3 -2.8 10 12 1.0 Min 1.0 2.0 1701G Typ Max 6.0 12.0 10.0 11.0 30 450 50 600 5.3 2.8 Unit V mV mV pA pA pA pA V V Test Conditions Dual Supply Single Supply RS 100K 0C TA +70C TA = 25C 0C TA +70C TA = 25C 0C TA +70C V+ = +5V VS = 2.5V
IOS
IB
1.0
1.0
1.0
1.0
VIR RIN
-0.3 -2.8
TCVOS
7
7
7
7
V/C
RS 100K
PSRR
70 70 70 70
80 80 83 83
65 65 65 65
80 80 83 83
65 65 65 65
80 80 83 83
60 60 60 60
80 80 83 83
dB dB dB dB
R S 100K 0C TA +70C R S 100K 0C TA +70C
CMRR
Large Signal Voltage Gain
AV
40 20
100 1000
32 20
100 1000
32 20
100 1000
20 10
80 1000
V/ mV V/ mV V/ mV
RL = 100K RL 1M RL = 100K 0C TA +70C
RL =1M V+ = +5V
Output Voltage Range
VO low VO high 4.99 VO low VO high 2.40
0.001 4.999 -2.48 2.48 1
0.01 4.99 -2.40 2.40
0.001 4.999 -2.48 2.48 1
0.01 4.99 -2.40 2.40
0.001 4.999 -2.48 2.48 1
0.01 -2.40 2.40
0.001 4.99 4.999 -2.48 2.48 1
0.01 -2.40
V V V V mA
0C TA +70C RL =100K 0C TA +70C
Output Short Circuit Current Supply Current Power Dissipation
ISC
IS PD
120
250 1.25
120
250 1.25
120
250 1.25
120
300 1.50
A mW
VIN = 0V No Load VS = 2.5V
ALD1701A/ALD1701B ALD1701/ALD1701G
Advanced Linear Devices
2
OPERATING ELECTRICAL CHARACTERISTICS (cont'd) T A = 25C VS = 2.5V unless otherwise specified
Parameter Input Capacitance Bandwidth Slew Rate Symbol CIN Min 1701A Typ Max 1 Min 1701B Typ Max 1 Min 1701 Typ 1 Max Min 1701G Typ Max 1 Unit pF Test Conditions
BW SR
400 0.33
700 0.7
400 0.33
700 0.7
400 0.33
700 0.7
700 0.7
KHz V/s AV = +1 RL = 100K RL = 100K RL =100K CL = 50pF
Rise time Overshoot Factor Settling Time
tr
0.2
0.2
0.2
0.2
s %
20
20
20
20
ts
10.0
10.0
10.0
10.0
s
0.1%
A V = -1RL=100K
CL = 50pF
TA = 25C VS = 5.0V unless otherwise specified
Parameter Power Supply
Rejection Ratio
Symbol PSRR
Min
1701A Typ Max 83
Min
1701B Typ Max 83
Min
1701 Typ 83
Max
Min
1701G Typ 83
Max
Unit dB
Test Conditions RS 100K
Common Mode
Rejection Ratio
CMRR
83
83
83
83
dB
RS 100K
Large Signal Voltage Gain Output Voltage Range Bandwidth Slew Rate
AV
250
250
250
250
V/mV
RL =100K
VO low VO high BW SR
4.90
-4.98 4.98 1.0 1.0
-4.90 4.90
-4.98 4.98 1.0 1.0
-4.90 4.90
-4.98 4.98 1.0 1.0
-4.90 4.90
-4.98 -4.90 4.98 1.0 1.0
V V MHz V/s
RL =100K
AV = +1 CL = 50pF
VS = 2.5V -55C TA +125C unless otherwise specified
1701B DA Parameter Input Offset Voltage Input Offset Current Input Bias Current Power Supply Rejection Ratio Common Mode Rejection Ratio Large Signal Voltage Gain Output Voltage Range CMRR 60 83 60 83 dB RS 100K Symbol VOS Min Typ Max 3.0 Min 1701 DA Typ Max 6.5 Unit mV Test Conditions RS 100K
IOS
8.0
8.0
nA
IB PSRR 60 75
10.0
10.0
nA RS 100K
60
75
dB
AV
15
50
15
50
V/ mV
RL = 100K
VO low VO high
2.35
-2.47 2.45
-2.40 2.35
-2.47 2.45
-2.40
V V
RL = 100K
ALD1701A/ALD1701B ALD1701/ALD1701G
Advanced Linear Devices
3
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 operational 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 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 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 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 1012 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 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 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 0.1C above ambient temperature under most operating conditions.
TYPICAL PERFORMANCE CHARACTERISTICS
SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE
500
COMMON MODE INPUT VOLTAGE RANGE AS A FUNCTION OF SUPPLY VOLTAGE
7 6 5 4 3 2 1 0 TA = 25C
SUPPLY CURRENT (A)
400 300 200
TA = -55C
+70C 100 0 0 1 2 3 4 5 6 SUPPLY VOLTAGE (V) +125C
COMMON MODE INPUT VOLTAGE RANGE (V)
INPUTS GROUNDED OUTPUT UNLOADED
+25C -25C
0
1
2
3
4
5
6
7
SUPPLY VOLTAGE (V)
OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF LOAD RESISTANCE
1000
INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE
10000
INPUT BIAS CURRENT (pA)
OPEN LOOP VOLTAGE GAIN (V/mV)
1000 100
VS = 2.5V
100
10
10 VS = 2.5V TA = 25C 1 10K 100K 1M 10M
1.0 0.1 -50 -25 0 25 50 75 100 125
LOAD RESISTANCE ()
AMBIENT TEMPERATURE (C)
ALD1701A/ALD1701B ALD1701/ALD1701G
Advanced Linear Devices
4
TYPICAL PERFORMANCE CHARACTERISTICS
OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF SUPPLY VOLTAGE AND TEMPERATURE
OUTPUT VOLTAGE SWING (V)
1000
OUTPUT VOLTAGE SWING AS A FUNCTION OF SUPPLY VOLTAGE
6 5 4 3 2 1 25C TA +125C RL = 100K
OPEN LOOP VOLTAGE GAIN (V/mV)
100
10 55C TA +125C RL = 100K 1 0 2 4 SUPPLY VOLTAGE (V) 6 8
0
1
2
3
4
5
6
7
SUPPLY VOLTAGE (V)
INPUT OFFSET VOLTAGE AS A FUNCTION OF AMBIENT TEMPERATURE REPRESENTATIVE UNITS
INPUT OFFSET VOLTAGE (mV)
OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF FREQUENCY
120 100 80 60 40 20 0 -20 0 45 90 135 180 1 10 100 1K 10K 100K FREQUENCY (Hz) 1M 10M VS = 2.5V TA = 25C
+5 +4 +3 +2 +1 0 -1 -2 -3 -4 -5 -50 -25 0 +25 +50
VS = 2.5V
OPEN LOOP VOLTAGE GAIN (dB)
PHASE SHIFT IN DEGREES
+75
+100 +125
AMBIENT TEMPERATURE (C)
INPUT OFFSET VOLTAGE AS A FUNCTION OF COMMON MODE INPUT VOLTAGE
INPUT OFFSET VOLTAGE (mV)
15 10 5 0 -5 -10 VS = 2.5V TA = 25C
LARGE - SIGNAL TRANSIENT RESPONSE
2V/div VS = 1.0V TA = 25C RL = 100K CL = 50pF
500mV/div
-15 -2 -1 0 +1 +2 +3 COMMON MODE INPUT VOLTAGE (V)
5s/div
LARGE - SIGNAL TRANSIENT RESPONSE
5V/div VS = 2.5V TA = 25C RL = 100K CL = 50pF
SMALL - SIGNAL TRANSIENT RESPONSE
100mV/div VS = 2.5V TA = 25C RL = 100K CL = 50pF
2V/div
5s/div
20mV/div
2s/div
ALD1701A/ALD1701B ALD1701/ALD1701G
Advanced Linear Devices
5
TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER RAIL-TO-RAIL WAVEFORM
~ ZIN = 1012
5V 0.1F
INPUT
+5V 0V
OUTPUT VIN 0 VIN 5V
+
+5V OUTPUT 0V
* See Rail to Rail Waveform
Performance waveforms. Upper trace is the output of a Wien Bridge Oscillator. Lower trace is the output of Rail-to-rail voltage follower.
HIGH INPUT IMPEDANCE RAIL-TO-RAIL PRECISION DC SUMMING AMPLIFIER
10M +2.5V 0.1F VOUT 0.1F V- VIN V+ V- VOUT V+ 10M
PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER
RF = 5M I PHOTODIODE
V1 V2
10M 10M
10M
V3 V4 10M VOUT = V1 + V2 - V3 - V4 - 2.5V
RIN = 10M Accuracy limited by resistor tolerances and input offset voltage
WIEN BRIDGE OSCILLATOR (RAIL-TO-RAIL) SINE WAVE GENERATOR
+2.5V OUTPUT
+
.01F C = .01F R = 10K
~ f= 1
-2.5V 10K 10K 2RC ~ 1.6KHz
* See Rail to Rail Waveform
ALD1701A/ALD1701B ALD1701/ALD1701G
+ -
+
+2.5V
VOUT = 1 X RF
RL = 100K -2.5V
RAIL-TO-RAIL VOLTAGE COMPARATOR
+5V VIN +5V 50K
+
10M
0.1F
10K
OUTPUT
LOW VOLTAGE INSTRUMENTATION AMPLIFIER
V+ 1M 0.1F 100K 500K V+
+ Vf max = 20KHz -40mV VIN 40mV V+ 0.1F 0.1F
100K
0.1F
50K VOUT
+
V+ 1M 100K 100K 0.1F V1M 0.1F V-
1M
+
V-
GAIN = 25 V- VOUT V+. All resistors are 1%. V+ = +1.0V, V- = -1.0V. Short circuit input current 1A.
Advanced Linear Devices
6

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