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ADVANCED LINEAR DEVICES, INC.
ALD1706A/ALD1706B ALD1706/ALD1706G
ULTRA MICROPOWER RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION The ALD1706 is a monolithic CMOS ultra micropower high slew-rate, high performance 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 40A maximum at 5V supply voltage. It is manufactured with Advanced Linear Devices' enhanced ACMOS silicon gate CMOS process. The ALD1706 is designed to offer high performance for a wide range of applications requiring very low power dissipation. It offers the popular industry standard single operational amplifier pin configuration. The ALD1706 has been developed specifically for the +5V single battery or 1V to 6V dual battery 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 close to or 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 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 400KHz, a slew rate of 0.17V/s, low offset voltage and temperature drift, make the ALD1706 a versatile, micropower operational amplifier. The ALD1706, designed and fabricated with silicon gate CMOS technology, offers 0.1pA typical input bias current. On chip offset voltage trimming allows the device to be used without nulling in most applications.
FEATURES * 20A supply current * 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 -- 0.1pA 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 a 20K load * Output short circuit protected * Unity gain bandwidth of 0.4MHz * Slew rate of 0.17V/s 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
Operating Temperature Range -55C to +125C 0C to +70C 0C to +70C 8-Pin CERDIP Package ALD1706A DA ALD1706B DA ALD1706 DA 8-Pin Small Outline Package (SOIC) ALD1706A SA ALD1706B SA ALD1706 SA 8-Pin Plastic Dip Package ALD1706A PA ALD1706B PA ALD1706 PA ALD1706G PA
N/C -IN +IN V-
1 2 3 4 TOP VIEW DA, PA, SA PACKAGE
8 7 6 5
N/C V+ OUT N/C
* Contact factory for industrial temperature range
* N/C Pin is connected internally. 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 1.0 2.0 1706A Typ Max 6.0 12.0 0.9 1.7 0.1 25 240 30 300 5.3 2.8 -0.3 -2.8 0.1 Min 1.0 2.0 1706B Typ Max 6.0 12.0 2.0 2.8 25 240 30 300 5.3 2.8 -0.3 -2.8 0.1 Min 1.0 2.0 1706 Typ Max 6.0 12.0 4.5 5.3 25 240 30 300 5.3 2.8 -0.3 -2.8 0.1 Min 1.0 2.0 1706G Typ Max 6.0 12.0 10.0 11.0 30 450 50 600 5.3 2.8 Unit V V mV mV pA pA pA pA V V V/C dB dB dB dB RS 100K RS 100K 0C TA +70C RS 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
IOS IB
0.1
0.1
0.1
0.1
VIR
-0.3 -2.8
RIN
1012
1012
1012
1012
TCVOS 70 70 70 70
7 80 80 83 83 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
Power Supply PSRR Rejection Ratio Common Mode CMRR Rejection Ratio
Large Signal Voltage Gain
AV
32 20
100
32 20
100
32 20
100
20 10
80
V/ mV V/ mV
RL = 1M RL = 1M 0C TA +70C
RL =1M
Output Voltage Range Output Short Circuit Current
VO low VO high 4.99 VO low VO high 2.30 ISC
0.001 4.999 -2.40 2.40 200 20
0.01 4.99 -2.30 2.30
0.001 0.01 4.999 -2.40 -2.30 2.40 200
4.99 2.30
0.001 0.01 4.999 -2.40 -2.30 2.40 200
4.99 2.30
0.001 0.01 4.999 -2.40 -2.30 2.40 200
V V V V A
0C TA +70C R L =100K 0C TA +70C
Supply Current IS Power Dissipation
40
20
40
20
40
20
50
A
VIN = 0V No Load VS = 2.5V
PD
200
200
200
250
W
ALD1706A/ALD1706B ALD1706/ALD1706G
Advanced Linear Devices
2
OPERATING ELECTRICAL CHARACTERISTICS (cont'd) TA = 25C VS = 2.5V unless otherwise specified
Parameter Input Capacitance Bandwidth Slew Rate Symbol CIN BW SR Min 1706A Typ Max 1 400 0.17 Min 1706B Typ Max 1 400 0.17 Min 1706 Typ 1 400 0.17 Max Min 1706G Typ Max 1 400 0.17 Unit pF KHz V/s AV = +1 RL = 1M RL = 1M RL =1M CL = 25pF 0.1% AV = -1 RL=1M CL =25pF Test Condition
Rise time Overshoot Factor Settling Time
tr
1.0 20
1.0 20
1.0 20
1.0 20
s %
ts
10.0
10.0
10.0
10.0
s
T A = 25C VS = 1.0V unless otherwise specified
Parameter Power Supply
Rejectio Ratio
Symbol PSRR
Min
1706A Typ Max 70
Min
1706B Typ Max 70
Min
1706 Typ 70
Max
Min
1706G Typ Max 70
Unit dB
Test Condition RS 1M
Common Mode
Rejection Ratio
CMRR
70
70
70
70
dB
RS 1M
Large Signal Voltage Gain Output Voltage
Range
AV VO low VO high BW SR
50 -0.95 0.95 0.3 0.17 -0.9 0.9
50 -0.95 0.95 0.3 0.17 -0.9 0.9
50 -0.95 0.95 0.3 0.17 -0.9 0.9
50 -0.95 0.95 0.3 0.17 -0.9
V/ mV V V MHz V/s
RL =1M R L =1M
0.9
Bandwidth Slew Rate
AV = +1 CL = 25pF
V S = 2.5V -55C TA +125C unless otherwise specified
1706B 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 1M IB PSRR 60 75 10.0 60 75 10.0 nA dB RS 1M Symbol VOS IOS Min Typ Max 3.0 8.0 Min 1706 DA Typ Max 6.5 8.0 Unit mV nA Test Conditions RS 100K
AV VO low VO high
15 2.30
50 -2.40 2.40 -2.30
15 2.30
50 -2.40 2.40 -2.30
V/ mV V V
RL = 1M RL = 1M
ALD1706A/ALD1706B ALD1706/ALD1706G
Advanced Linear Devices
3
Design & Operating Notes:
1. The ALD1706 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 ALD1706 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 ALD1706 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 ALD1706 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 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 ALD1706 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 ALD1706, 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 less than 0.1C above ambient temperature under most operating conditions.
TYPICAL PERFORMANCE CHARACTERISTICS
SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE
100 INPUTS GROUNDED OUTPUT UNLOADED 80 TA = -55C 60 40 20 +70C 0 0 1 2 3 4 5 6 SUPPLY VOLTAGE (V) +125C
COMMON MODE INPUT VOLTAGE RANGE AS A FUNCTION OF SUPPLY VOLTAGE
7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 SUPPLY VOLTAGE (V) TA = 25C
-25C +25C
SUPPLY CURRENT (A)
OPEN LOOP VOLTAGE GAIN AS AFUNCTION OF LOAD RESISTANCE
1000
10000
COMMON MODE INPUT VOLTAGE RANGE (V)
INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE
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)
ALD1706A/ALD1706B ALD1706/ALD1706G
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
OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF FREQUENCY
120 100 80 60 40 20 0 -20 1 10 0 45 90 135 180 100 1K 10K 100K FREQUENCY (Hz) 1M 10M VS = 2.5V TA = 25C
OPEN LOOP VOLTAGE GAIN (dB)
VS = 2.5V
PHASE SHIFT IN DEGREES
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= 25pF
500mV/div
10s/div
-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= 25pF
SMALL - SIGNAL TRANSIENT RESPONSE
100mV/div VS = 2.5V TA = 25C RL = 100K CL= 25pF
2V/div
10s/div
50mV/div
10s/div
ALD1706A/ALD1706B ALD1706/ALD1706G
Advanced Linear Devices
5
TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER CHARGE INTEGRATOR
1000pF
~ ZIN = 1012
5V 0.1F
OUTPUT VIN 0 VIN 5V * See Rail to Rail Waveform
1M VIN
+2.5V VOUT
+
+
-2.5V
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
RAIL-TO-RAIL VOLTAGE COMPARATOR
+5V VIN
0.1F VOUT 0.1F
50K +5V
+
10M 0 VIN V+
0.1F
RIN = 10M Accuracy limited by resistor tolerances and input offset voltage
HIGH IMPEDANCE NON-INVERTING AMPLIFIER
100K
900K +1V
VIN
+ -1V
WIEN BRIDGE OSCILLATOR
250K +1.0V VOUT +
2M
-1.0V Power Supply = 1.0V
2.0V V+ 12.0V 0.1 VOUT (V+ - 0.1) V OUPUT CURRENT 200A
0.0015F C
100K R
0.0015F 100K R C 1 2 RC
f
VOUT = SINEWAVE 2V Peak to Peak
ALD1706A/ALD1706B ALD1706/ALD1706G
+ -
OUTPUT
PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER
RF = 5M I PHOTODIODE
+
+2.5V
VOUT = 1 X RF
VOUT
RL = 100K -2.5V
MICROPOWER BUFFERED VARIABLE VOLTAGE SOURCE
V+
V+
VIN + 1F
VOUT
1.0KHz
Advanced Linear Devices
6

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