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ADVANCED LINEAR DEVICES, INC.
ALD2706A/ALD2706B ALD2706
DUAL ULTRA MICROPOWER RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION The ALD2706 is a dual 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 80A maximum at 5V supply voltage. It is manufactured with Advanced Linear Devices' enhanced A CMOS silicon gate CMOS process. The ALD2706 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. The ALD2706 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 equal to 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 25pF capacitive and 20K resistive loads. These features, combined with extremely low input currents, high open loop voltage gain of 100V/mV, useful bandwidth of 200KHz, a slew rate of 0.1V/s, low offset voltage and temperature drift, make the ALD2706 a versatile, micropower dual operational amplifier. A typical ALD2706 has the capacity to process a 0.998V amplitude analog signal with only 1.000V single supply voltage, while requiring only 0.1pA input bias current. FEATURES * Typical 20A supply current per amplifier * All parameters specified for +5V single supply or 2.5V dual supply systems * Rail-to-rail input and output voltage ranges * Unity gain stable * Extremely low input bias currents -- 0.1pA * High source impedance applications * Dual power supply 1.0V to 6.0V * Single power supply +2V to +12V * High voltage gain * Unity gain bandwidth of 0.2MHz * Slew rate of 0.1V/s * Symmetrical 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
Operating Temperature Range -55C to +125C 0C to +70C 0C to +70C 8-Pin CERDIP ALD2706A DA ALD2706B DA ALD2706 DA 8-Pin Small Outline Package (SOIC) ALD2706A SA ALD2706B SA ALD2706 SA 8-Pin Plastic Dip Package ALD2706A PA ALD2706B PA ALD2706 PA
OUT A -IN A +IN A V1 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 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 VS V+ VOS IOS IB VIR -0.3 -2.8 10 12 0.1 0.1 Min 1.0 2.0 2706A Typ Max Min 2706B Typ Max 6.0 12.0 5.0 5.8 0.1 0.1 -0.3 -2.8 1012 20 200 20 200 5.3 2.8 -0.3 -2.8 1012 0.1 0.1 Min 1.0 2.0 2706 Typ Max 6.0 12.0 10.0 11.0 20 200 20 200 5.3 2.8 Unit V V mV mV pA pA pA pA V V V/C dB dB dB dB RS 100K R S 100K 0C TA +70C RS 100K 0C TA +70C RL = 100K RL 1M RL = 100K 0C TA +70C R L = 1M V+ = +5V 0C TA +70C R L = 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+ = +5 VS = 2.5V
6.0 1.0 12.0 2.0 2.0 2.8 20 200 20 200 5.3 2.8
RIN TCVOS PSRR 65 65 65 65
7 80 80 83 83 65 65 65 65
7 80 80 83 83 60 60 60 60
10 80 80 83 83
CMRR
Large Signal Voltage Gain
AV
10 10
100 300
10 10
100 300
5 5
80 300
V/mV V/mV V/mV
Output Voltage Range
VO low VO high VO low VO high
4.99
0.001 4.999 -2.40 2.40 200
0.01
0.001 4.99 4.999
0.01
0.001 4.99 4.999
0.01
V V V V A A
-2.25 2.25
2.25
-2.40 -2.25 -2.40 2.40 2.25 2.40 200 200
-2.25
Output Short Circuit Current
ISC IS
Supply Current
50
80
50
80
50
80
VIN=0V No Load Both amplifiers VS = 2.5V
Power Dissipation
PD
400
400
400
W
ALD2706A/ALD2706B ALD2706
Advanced Linear Devices
2
OPERATING ELECTRICAL CHARACTERISTICS (cont'd) TA = 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 2706A Typ 1 200 0.1 1.0 20 10.0 Max Min 2706B Typ 1 200 0.1 1.0 20 10.0 Max Min 2706 Typ 1 200 0.1 1.0 20 10.0 Max Unit pF KHz V/s s % s AV = +1 RL = 100K RL = 100K RL = 100K CL = 25pF 0.1% AV = -1 CL = 25pF RL = 100K AV = 100 Test Conditions
CS
140
140
140
dB
TA = 25C VS = 1.0V 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 2706A Typ 80 Max Min 2706B Typ 80 Max Min 2706 Typ 80 Max Unit dB Test Conditions RS 1M
CMRR
80
80
80
dB
RS 1M
AV VO low VO high BW SR
50 -0.95 0.95 0.2 0.1 -0.9 0.9
50 -.95 0.95 0.2 0.1 -0.9 0.9
50 -0.95 0.95 0.2 0.1 -0.9
V/mV V V MHz V/s
RL = 1M RL = 1M
0.9
AV =+1 CL = 25pF
VS = 2.5V -55C TA +125C unless otherwise specified
2706A 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 Symbol VOS IOS IB PSRR CMRR AV VO low VO high 60 60 10 2.25 75 83 50 -2.40 2.40 -2.25 2.25 Min Typ Max 3.0 4.0 Min 2706B DA Typ Max 6.0 4.0 Min 2706 DA Typ Max 12.0 4.0 Unit mV nA Test Conditions RS 100K
4.0 60 60 10 75 83 50
4.0 60 60 5 75 83 50 -2.40 2.40
4.0
nA dB dB V/mV RS 1M RS 1M RL = 1M R L = 1M
-2.40 -2.25 2.40 2.25
-2.25
V V
ALD2706A/ALD2706B ALD2706
Advanced Linear Devices
3
Design & Operating Notes:
1. The ALD2706 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 ALD2706 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 ALD2706 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 ALD2706 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 noninverting 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 10 12 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 ALD2706 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 ALD2706, 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
INPUTS GROUNDED OUTPUT UNLOADED 160 TA = -55C 120 80 40 +70C 0 0 1 2 3 4 5 6 SUPPLY VOLTAGE (V) +125C +25C
7 6 TA = 25C
COMMON MODE INPUT VOLTAGE RANGE AS A FUNCTION OF SUPPLY VOLTAGE
SUPPLY CURRENT (A)
COMMON MODE INPUT VOLTAGE RANGE (V)
-25C
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
10000
INPUT BIAS CURRENT (pA)
1000 100
VS = 2.5V
OPEN LOOP VOLTAGE GAIN (V/mV)
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)
ALD2706A/ALD2706B ALD2706
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 GAIN 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)
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= 25pF
500mV/div
-15 -2 -1 0 +1 +2 +3 COMMON MODE INPUT VOLTAGE (V)
10s/div
LARGE - SIGNAL TRANSIENT RESPONSE
5V/div VS = 2.5V TA = 25C RL = 100K CL= 25pF
SMALL - SIGNAL TRANSIENT RESPONSE
100mV/div VS = 2.5V TA = 25C RL = 100K CL= 25pF
2V/div
10s/div
50mV/div
10s/div
ALD2706A/ALD2706B ALD2706
Advanced Linear Devices
5
TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER RAIL-TO-RAIL WAVEFORM
+5V 0V
~ ZIN = 1012
5V 0.1F
INPUT
OUTPUT VIN 0 VIN 5V * See Rail to Rail Waveform
+
1/2 ALD2706
+5V OUTPUT 0V
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
V+ = +2.5V V1 V2 10M 10M V3 V4 10M VOUT = V1 + V2 - V3 - V4 V- = - 2.5V 10M V- VOUT V+ 10M 10M 0.1F VOUT 0.1F
RAIL-TO-RAIL WINDOW COMPARATOR
+5V 8 100K VREF (HIGH) 3 2 VIN + VOUT 5 + 7 100K VREF (LOW) 6 1/2 ALD2706 1 1/4 74 C00
RIN = 10M Accuracy limited by resistor tolerances and input offset voltage
PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER
RF = 5M I PHOTODIODE + +2.5V VOUT = 1 X RF
1/2 ALD2706
ALD2706A/ALD2706B ALD2706
+ -
4
1/2 ALD2706
VOUT (LOW) FOR VREF (LOW) < VIN < VREF(HIGH)
HIGH IMPEDANCE NON-INVERTING AMPLIFIER
100K 900K +1V VOUT
-2.5V
RL = 100K
VIN
+ -1V 1/2 ALD2706
LOW VOLTAGE INSTRUMENTATION AMPLIFIER
1/2 ALD2706 V+ 0.1F R3 100K R4 500K
+
Vf max = 20KHz -40mV VIN 40mV 0.1F
100K R1 50K V+ 1M
V+
0.1F
+
VOUT 1/2 ALD2706 V0.1F V-
+
1/2 ALD2706 R2 100K
100K V+ = +1.0V V- = -1.0V V- VOUT V+ All resistors are 1%.
1M VOUT = VIN ( 1+ 2R2 ) (R4) R1 R3 = 25 VIN
Advanced Linear Devices
6

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