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ADVANCED LINEAR DEVICES, INC.
ALD1702A/ALD1702B ALD1702/ALD1703
5V RAIL-TO-RAIL PRECISION OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION The ALD1702/ALD1703 is a monolithic 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 +4V 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. The device is designed to offer a balanced trade-off of performance parameters providing a wide range of desired specifications. It offers the industry pin configuration of A741 and ICL7611 types. The ALD1702/ALD1703 has been developed specifically with the 5V single supply or 2.5 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 5K resistive loads in non-inverting unity gain connection and double the capacitance in the inverting unity gain mode. These features, coupled with extremely low input currents, high voltage gain, useful bandwidth of 1.5MHz, slew rate of 2.1V/s, low power dissipation, low offset voltage and temperature drift, make the ALD1702/ ALD1703 a truly versatile, user friendly, operational amplifier. The ALD1702/ALD1703 is designed and fabricated with silicon gate CMOS technology, and offers 1pA typical input bias current. 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 7V/C which eliminates many trim or temperature compensation circuits. For precision applications, the ALD1702 is designed to settle to 0.01% in 8s.
FEATURES * Rail-to-rail input and output voltage ranges * All parameters specified for +5V single supply or 2.5V dual supply systems. * High load capacitance capability -4000pF typical * 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 2.5V to 5.0V operation * Single power supply +5V to +12V operation * High voltage gain -- typically 85V/mV @ 2.5V and 250V/mV @ 5.0V * Drive as low as 2K load with 5mA drive current * Output short circuit protected * Unity gain bandwidth of 1.5MHz (1.0MHz min.) * Slew rate of 2.1V/s (1.4V/s min.) * 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 Coaxial cable driver
ORDERING INFORMATION
-55C to +125C 8-Pin CERDIP Package ALD1702A DA ALD1702B DA ALD1702 DA ALD1703 DA Operating Temperature Range 0C to +70C 0C to +70C 8-Pin Small Outline Package (SOIC) ALD1702A SA ALD1702B SA ALD1702 SA ALD1703 SA 8-Pin Plastic Dip Package ALD1702A PA ALD1702B PA ALD1702 PA ALD1703 PA
PIN CONFIGURATION
N/C -IN +IN V-
1 2 3 4 TOP VIEW DA, PA, SA PACKAGE 2
8 7 6 5
N/C V+ OUT N/C
* Contact factory for industrial temperature range
* N/C Pin is internally connected. Do not connect externally.
(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 Symbol Min VS V+ VOS IOS 1.0 2.0 4.0 1702A Typ Max 6.0 12.0 0.9 1.7 25 240 30 300 5.3 2.8 1012 -0.3 -2.8 1012 1.0 Min 2.0 4.0 1702B Typ Max 6.0 12.0 2.0 2.8 25 240 30 300 5.3 2.8 -0.3 -2.8 1012 1.0 Min 2.0 4.0 1702 Typ Max 6.0 12.0 4.5 5.3 25 240 30 300 5.3 2.8 0.15 -2.35 1012 1.0 Min 2.0 4.0 1703 Typ Max 6.0 12.0 10.0 11.0 30 450 50 600 4.85 2.35 Unit V mV mV pA pA pA pA V V V/C RS 100K R S 100K 0C TA +70C RS 100K 0C TA +70C RL =10K RL 1M RL =10K 0C TA +70C R L =1M V+ = 5V 0C TA +70C R L =10K 0C TA +70C Test Conditions Single Supply RS 100K 0C TA +70C TA = 25C 0C TA +70C TA = 25C 0C TA +70C V+ = +5V VS = 2.5V
IB
1.0
1.0
1.0
1.0
VIR RIN
-0.3 -2.8
TCVOS
7
7
7
10
Power Supply PSRR Rejection Ratio Common Mode CMRR Rejection Ratio Large Signal Voltage Gain AV
70 70 70 70 50 20
80 80 83 83 85 400
65 65 65 65 50 20
80 80 83 83 85 400
65 65 65 65 50 20
80 80 83 83 85 400
60 60 60 60 32 10
80 80 83 83 85 300
dB dB dB dB V/mV V/mV V/mV
Output Voltage Range
VO low VO high VO low VO high
0.002 4.99 4.998 -2.44 2.35 2.44 8
0.01 4.99 -2.35 2.35
0.002 0.01 4.998 -2.44 -2.35 2.44 8
4.99 2.35
0.002 0.01 4.998 -2.44 -2.35 2.44 8
4.99 2.3
0.002 4.998 -2.4 2.4 8
0.01 -2.3
V V V
Output Short ISC Circuit Current Supply Current IS Power Dissipation Input Capacitance Bandwidth Slew Rate PD
mA
1.1
2.0
1.1
2.0
1.1
2.0
1.1
2.5
mA
VIN = 0V No Load VS = 2.5V
5.5
10.0
5.5
10.0
5.5
10.0
5.5
12.5
mW
CIN
1
1
1
1
pF
BW SR
1.0 1.4
1.5 2.1
1.0 1.4
1.5 2.1
1.0 1.4
1.5 2.1
0.7 1.1
1.5 2.1
MHz V/s s AV = +1 RL = 10K RL = 10K CL = 100pF
Rise time
tr
0.2
0.2
0.2
0.2
ALD1702A/ALD1702B ALD1702/ALD1703
Advanced Linear Devices
2
OPERATING ELECTRICAL CHARACTERISTICS (cont'd) T A = 25C VS = 2.5V unless otherwise specified
Parameter Overshoot Factor Symbol Min 1702A Typ Max 10 Min 1702B Typ Max 10 Min 1702 Typ 10 Max Min 1703 Typ 10 Max Unit % Test Conditions RL =10K CL = 100pF Gain = 1 Gain = 5 f =1KHz
Maximum Load Capacitance Input Noise Voltage
CL
400 4000 26
400 4000 26
400 4000 26
400 4000 26
pF pF nV/Hz
en
Input Current Noise Settling Time
in
0.6
0.6
0.6
0.6
fA/Hz
f =10Hz
ts
8.0 3.0
8.0 3.0
8.0 3.0
8.0 3.0
s s
0.01% 0.1% AV = -1 RL=5K CL=50pF
TA = 25C VS = 5.0V unless otherwise specified
Parameter Power Supply
Rejection Ratio
Symbol PSRR
Min
1702A Typ Max 83
Min
1702B Typ Max 83
Min
1702 Typ 83
Max
Min
1703 Typ 83
Max
Unit dB
Test Conditions RS 100K
Common Mode CMRR
Rejection Ratio
83
83
83
83
dB
RS 100K
Large Signal Voltage Gain
AV
250
250
250
250
V/mV
RL =10K
Output Voltage VO low Range VO high Bandwidth Slew Rate BW SR
4.8
-4.9 4.93 1.7 2.8
-4.8 4.8
-4.9 4.93 1.7 2.8
-4.8 4.8
-4.9 4.93 1.7 2.8
-4.8 4.8
-4.9 4.93 1.7 2.8
-4.8
V
RL =10K
MHz V/s AV = +1 CL = 50pF
V S = 2.5V -55C T A +125C unless otherwise specified
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 IB 10.0 10.0 10.0 nA RS 100K RS 100K Symbol VOS IOS Min 1702A DA Typ Max 3.0 Min 1702B DA Typ Max 4.0 Min 1702 DA Typ Max 6.5 Unit mV Test Conditions RS 100K
8.0
8.0
8.0
nA
PSRR
60
75
60
75
60
75
dB
CMRR
60
83
60
83
60
83
dB
AV VO low VO high
10
25
10
25
7
25
V/ mV
RL = 10K RL = 10K
4.8
0.1 4.9
0.2 4.8
0.1 4.9
0.2 4.8
0.1 4.9
0.2
V
ALD1702A/ALD1702B ALD1702/ALD1703
Advanced Linear Devices
3
Design & Operating Notes:
1. The ALD1702/ALD1703 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 ALD1702 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 ALD1702 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 ALD1702 has shown itself to be more resistant to parasitic oscillations. 2. The ALD1702/ALD1703 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 ALD1702/ALD1703 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 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 ALD1702/ALD1703 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
7
OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF SUPPLY VOLTAGE AND TEMPERATURE
1000
COMMON MODE INPUT VOLTAGE RANGE (V)
5 4 3 2 1 0 0 1 2 3 4 5 6 7
OPEN LOOP VOLTAGE GAIN (V/mV)
6
TA = 25C
} -55C } +25C
100
} +125C
10 RL= 10K RL= 5K 1 0 2 4 SUPPLY VOLTAGE (V) 6 8
SUPPLY VOLTAGE (V)
INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE
10000
5
SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE
INPUTS GROUNDED OUTPUT UNLOADED
INPUT BIAS CURRENT (pA)
1000 100
SUPPLY CURRENT (mA)
VS = 2.5V
4 3 2 1 0 TA = -55C -25C +25C +80C +125C
10
1.0 0.1 -50 -25 0 25 50 75 100 125
0
1
2
3
4
5
6
AMBIENT TEMPERATURE (C)
SUPPLY VOLTAGE (V)
ALD1702A/ALD1702B ALD1702/ALD1703
Advanced Linear Devices
4
TYPICAL PERFORMANCE CHARACTERISTICS
7
OUTPUT VOLTAGE SWING AS A FUNCTION OF SUPPLY VOLTAGE
120
OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF FREQUENCY
100 80 60 40 20 0 -20 0 45 90 135 180 1 10 100 1K 10K 100K 1M 10M VS = 2.5V TA = 25C
OUTPUT VOLTAGE SWING (V)
5 4 3 2 0 1 2
RL = 10K RL = 10K
RL = 2K
3
4
5
6
7
SUPPLY VOLTAGE (V)
OPEN LOOP VOLTAGE GAIN (dB)
6
25C TA 125C
PHASE SHIFT IN DEGREES
FREQUENCY (Hz)
INPUT OFFSET VOLTAGE AS A FUNCTION OF AMBIENT TEMPERATURE REPRESENTATIVE UNITS
INPUT OFFSET VOLTAGE (mV)
VS = 2.5V
INPUT OFFSET VOLTAGE AS A FUNCTION OF COMMON MODE INPUT VOLTAGE
15
INPUT OFFSET VOLTAGE (mV)
+5 +4 +3 +2 +1 0 -1 -2 -3 -4 -5 -50 -25 0 +25 +50
10 5 0 -5 -10 -15
VS = 2.5V TA = 25C
+75
+100 +125
-2
-1
0
+1
+2
+3
AMBIENT TEMPERATURE (C)
COMMON MODE INPUT VOLTAGE (V)
OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF LOAD RESISTANCE
1000
LARGE - SIGNAL TRANSIENT RESPONSE
5V/div
OPEN LOOP VOLTAGE GAIN (V/mV)
100
VS = 2.5V TA = 25C RL = 10K CL = 50pF
10
VS = 2.5V TA = 25C
1V/div
1 1K 10K 100K 1000K
2s/div
LOAD RESISTANCE ()
VOLTAGE NOISE DENSITY AS A FUNCTION OF FREQUENCY
150
SMALL - SIGNAL TRANSIENT RESPONSE
100mV/div VS = 2.5V TA = 25C RL = 10K CL = 50pF
VOLTAGE NOISE DENSITY (nV/ Hz)
125 100 75 50 25 VS = 2.5V TA = 25C
20mV/div
2s/div
0 10 100 1K 10K 100K 1000K
FREQUENCY (Hz)
ALD1702A/ALD1702B ALD1702/ALD1703
Advanced Linear Devices
5
TYPICAL APPLICATIONS
RAIL TO RAIL VOLTAGE FOLLOWER/BUFFER RAIL-TO-RAIL WAVEFORM
~ ZIN = 1012 VIN 0 VIN 5V +
5V 0.1F OUTPUT RL =10K
INPUT
+5V 0V
+5V OUTPUT 0V
CL 400pF
* 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.
LOW OFFSET SUMMING AMPLIFIER
PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER
50K 10K INPUT 1 INPUT 2 10K GAIN = 5 * Circuit Drives Large Load Capacitance 4000pF + - 2.5V .01F CL = 4000pF OUTPUT +2.5V .01F
RF = 5M I
PHOTODIODE
+2.5V VOUT = I x RF
+
-2.5V
RL = 10K
WIEN BRIDGE OSCILLATOR (RAIL-TO -RAIL) SINE WAVE GENERATOR
RAIL-TO-RAIL VOLTAGE COMPARATOR
+
.01F C = .01F R = 10K
~ f= 1
+2.5V OUTPUT -2.5V 10K 10K 2RC ~ 1.6KHz 10K
+5V VIN +5V 50K 0.1F OUTPUT
+
10M
* See rail to rail waveform
ALD1702A/ALD1702B ALD1702/ALD1703
Advanced Linear Devices
6

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