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ADVANCED LINEAR DEVICES, INC.
ALD2711A/ALD2711B ALD2711
DUAL MICROPOWER PRECISION RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION The ALD2711 is a dual monolithic CMOS micropower precision 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. Typical supply current is 200A at 5V supply voltage. It is manufactured with Advanced Linear Devices' enhanced ACMOS silicon gate CMOS process. The device has an input stage that operates to +300mV above and -300mV below the supply voltages with no adverse effects and/or phase reversals. The ALD2711 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, each operational amplifier can operate with rail to rail input and output voltages. This means the signal input voltage and output voltage can be at the positive and negative supply voltages. This feature allows numerous analog serial stages and flexibility in input signal bias levels. Secondly, each 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, high useful bandwidth, and slew rate make the ALD2711 a versatile, micropower operational amplifier. The ALD2711 with on-chip offset voltage trimming allows the device to be used without nulling in most applications. The unique characteristics of the ALD2711 are modeled in an available macromodel.
FEATURES * Designed and characterized for 5V operation * Linear mode operation with input voltages 300mV beyond supply rails * Output voltages to within 2mV of power supply rails when driving a high impedance load * Unity gain stable * Extremely low input bias currents -- 0.01pA * Dual power supply 1.0V to 6.0V * Single power supply +2V to +12V * High voltage gain * Output short circuit protected * Unity gain bandwidth of 0.7MHz * Slew rate of 0.7V/s * Low power dissipation * Symmetrical complementary output drive APPLICATIONS * * * * * * * * * * * * Voltage follower/buffer/amplifier 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 ALD 2711A DA ALD 2711B DA ALD 2711 DA Operating Temperature Range 0C to +70C 0C to +70C 8-Pin Small Outline Package (SOIC) ALD 2711A SA ALD 2711B SA ALD 2711 SA 8-Pin Plastic Dip Package ALD 2711A PA ALD 2711B PA ALD 2711 PA
OUT A -IN A +IN A V-
1 2 3 4 TOP VIEW DA, PA, SA PACKAGE
8 7 6 5
V+ OUT B -IN B +IN B
* 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 T A = 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 Large Signal Voltage Gain Symbol VS V+ VOS IOS IB VIR RIN TCV OS PSRR 63 63 63 63 15 10 -0.3 -2.8 1013 Min 1.0 2.0 0.25 0.01 0.01 2711A Typ Max 6.3 12.6 0.6 1.0 10 280 10 280 5.3 2.8 -0.3 -2.8 1013 Min 1.0 2.0 0.5 0.01 0.01 2711B Typ Max 6.3 12.6 1.0 1.5 10 280 10 280 5.3 2.8 -0.3 -2.8 10 13 Min 1.0 2.0 0.8 0.01 0.01 2711 Typ Max 6.0 12.6 1.5 2.0 10 280 10 280 5.3 2.8 Unit V V mV mV pA pA pA pA V V V/C dB dB dB dB V/mV V/mV V/mV RS 100K RS 100K 0C TA +70C RS 100K 0C TA +70C RL = 100K RL 1M RL = 100K 0C TA +70C RL = 1M V+ = +5V 0C TA +70C RL = 100K 0C TA +70C 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
5 90 90 90 90 100 300 63 63 63 63 15 10
5 90 90 90 90 100 300 60 60 60 60 10 7
7 90 90 90 90 100 300
CMRR
AV
Output Voltage Range
VO low VO high VO low VO high ISC
4.99 2.40
0.001 4.999 -2.48 2.48 1
0.01 -2.40
0.001 0.01 4.99 4.999 -2.48 -2.40 2.40 2.48 1
0.001 0.01 4.99 4.999 -2.48 -2.40 2.40 2.48 1
V V V V mA
Output Short Circuit Current Supply Current Power Dissipation
IS PD
200
450
200
450
200
450
A
VIN = 0V No Load VS = 2.5V Both VS = 1.0V amplifiers
1.0 0.25
2.25 0.6
1.0 0.25
2.25 0.6
1.0 0.25
2.25 0.6
mW
ALD2711A/ALD2711B ALD2711
Advanced Linear Devices
2
OPERATING ELECTRICAL CHARACTERISTICS (cont'd) T A = 25C VS = 2.5V unless otherwise specified
Parameter Input Capacitance Bandwidth Slew Rate Rise time Overshoot Factor Settling Time Channel Separation ts Symbol CIN BW SR tr Min 2711A Typ 1 700 0.7 0.2 20 10.0 Max Min 2711B Typ 1 700 0.7 0.2 20 10.0 Max Min 2711 Typ 1 700 0.7 0.2 20 10.0 Max Unit pF KHz V/s s % s AV = +1 RL = 100K RL = 100K RL = 100K CL = 50pF 0.1% AV = 100 RL = 100K CL = 50pF AV = 100 Test Conditions
CS
140
140
140
dB
T A = 25C VS = 5.0V unless otherwise specified
Parameter Power Supply Rejection Ratio Common Mode Rejection Ratio Large Signal Voltage Gain Output Voltage Range Bandwidth Slew Rate Symbol PSRR Min 2711A Typ 100 Max Min 2711B Typ 100 Max Min 2711 Typ 100 Max Unit dB Test Conditions RS 100K
CMRR
100
100
100
dB
RS 100K
AV VO low VO high BW SR
300
300
300
V/mV
RL = 100K RL = 100K
4.90
-4.98 4.98 1.0 1.0
-4.90 4.90
-4.98 4.98 1.0 1.0
-4.90
-4.98 4.90 4.98 1.0 1.0
-4.90
V V MHz V/s
AV = +1 CL = 50pF
V S = 2.5V -55C TA +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 Symbol VOS IOS IB PSRR 60 85 Min 2711A DA Typ Max 1.5 Min 2711B DA Typ Max 2.0 Min 2711 DA Typ Max 2.5 Unit mV Test Conditions RS 100K
4 4 60 85
4 4 60 85
4 4
nA nA dB RS 100K RS 100K RL 100K
CMRR AV
60 10
83 50
60 10
83 50
60 10
83 50
dB V/mV
VO low VO high
2.35
-2.47 2.45
-2.40 2.35
-2.47 2.45
-2.40 2.35
-2.47 2.45
-2.40
V V
RL 100K
ALD2711A/ALD2711B ALD2711
Advanced Linear Devices
3
Design & Operating Notes:
1. The ALD2711 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 ALD2711 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 ALD2711 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 ALD2711 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 ALD2711 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 ALD2711, 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 0.2C above ambient temperature under most operating conditions.
TYPICAL PERFORMANCE CHARACTERISTICS
SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE
INPUTS GROUNDED OUTPUT UNLOADED TA = -55C 400 300 +70C 200 0 0 1 2 3 4 SUPPLY VOLTAGE (V) 5 6 +125C +25C -25C
7 6 TA = 25C
COMMON MODE INPUT VOLTAGE RANGE AS A FUNCTION OF SUPPLY VOLTAGE
SUPPLY CURRENT (A)
500
COMMON MODE INPUT VOLTAGE RANGE (V)
5 4 3 2 1 0 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
1000
INPUT BIAS CURRENT (pA)
OPEN LOOP VOLTAGE GAIN (V/mV)
100 10
VS = 2.5V
100
1.0
10 VS = 2.5V TA = 25C 1 10K 100K 1M 10M
0.1 0.01 -50 -25 0 25 50 75 100 125
LOAD RESISTANCE ()
AMBIENT TEMPERATURE (C)
ALD2711A/ALD2711B ALD2711
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)
+5 +4 +3 +2 +1 0 -1 -2 -3 -4 -5 -50 -25 0 +25 +50 +75 +100 +125 AMBIENT TEMPERATURE (C)
OPEN LOOP VOLTAGE AS A FUNCTION OF FREQUENCY
120 100 80 60 40 20 0 -20 1 10 100 1K 10K 100K FREQUENCY (Hz) 1M 0 45 90 135 180 10M VS = 2.5V TA = 25C
VS = 2.5V
OPEN LOOP VOLTAGE GAIN (dB)
PHASE SHIFT IN DEGREES
INPUT OFFSET VOLTAGE AS A FUNCTION OF COMMON MODE INPUT VOLTAGE
INPUT OFFSET VOLTAGE (mV)
LARGE - SIGNAL TRANSIENT RESPONSE
2V/div VS = 1.0V TA = 25C RL = 100K CL = 50pF
15 10 5 0 -5 -10
500mV/div 5s/div
VS = 2.5V TA = 25C
-15 -2 -1 0 +1 +2 +3 COMMON MODE INPUT VOLTAGE (V)
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
ALD2711A/ALD2711B ALD2711
Advanced Linear Devices
5
TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER RAIL-TO-RAIL WAVEFORM
+5V 0V
~ ZIN = 1013
5V 0.1F
INPUT
OUTPUT VIN 0 VIN 5V
+5V OUTPUT 0V
+
1/2 ALD2711
* 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
+5V
RAIL-TO-RAIL WINDOW COMPARATOR
V+ = +2.5V V1 V2 10M
100K
8 VREF (HIGH) 3 2 VIN + -
1/2 ALD2711 1 1/4 74 C00
10M 10M
10M
V3 V4 10M V- = - 2.5V 10M
VOUT = V1 + V2 - V3 - V4
RIN = 10M Accuracy limited by resistor tolerances and input offset voltage
VOUT (LOW) FOR VREF (LOW) < VIN < VREF(HIGH)
WIEN BRIDGE OSCILLATOR (RAIL-TO-RAIL) SINE WAVE GENERATOR
+2.5V VOUT
1/2 ALD2711
-2.5V .01F 10K 10K ~ = 1.6KHZ
C = .01F
R = 10K ~ f= 1 2RC
* See Rail-to-Rail Waveform
ALD2711A/ALD2711B ALD2711
+ -
0.1F 0.1F
1/2 ALD2711 VOUT V- VIN V+ V- VOUT V+
100K
VOUT 5 + 7 VREF (LOW) 6 -
4 1/2 ALD2711
PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER
RF = 5M I PHOTODIODE
+
-
10K
+
+2.5V
VOUT = I X RF
RL = 100K -2.5V
1/2 ALD2711
LOW VOLTAGE INSTRUMENTATION AMPLIFIER
V+ 1M 0.1F 100K 500K
+
1/2 ALD2711
Vf max = 20KHz -40mV VIN 40mV V+ 0.1F 0.1F
100K
V+
0.1F
+
50K V+ 1M VOUT
V100K 100K 1M 0.1F V-
1/2 ALD2711
1/2 ALD2711
+
1M V0.1F 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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