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ADVANCED LINEAR DEVICES, INC.
ALD1704A/ALD1704B ALD1704/ALD1704G RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION The ALD1704 is a CMOS monolithic operational amplifier with MOSFET input that has rail-to-rail input and output voltage ranges. The input voltage range and output voltage range are very close to the positive and negative power supply voltages. Typically the input voltage can be beyond positive power supply voltage V+, or the negative power supply voltage V- by up to 300mV. The output voltage swings to within 60mV of either positive or negative power supply voltages at rated load. This device is designed as an alternative to the popular JFET input operational amplifiers in applications where lower operating voltages, such as 9V battery or 3.25V to 6V power supplies are being used. It offers high slew rate of 5V/s at low operating power of 30mW. Since the ALD1704 is designed and manufactured with Advanced Linear Devices' standard enhanced ACMOS silicon gate CMOS process, it also offers low unit cost and exceptional reliability. The rail-to-rail input and output feature of the ALD1704 allows a lower operating supply voltage for a given signal voltage range and allows numerous analog serial stages to be implemented without losing operating voltage margin. The output stage is designed to drive up to 10mA into 400pF capacitive and 1.5K resistive loads at unity gain and up to 4000 pF at a gain of 5. Short circuit protection to either ground or the power supply rails is at approximately 15mA clamp current. Due to complementary output stage design, the output can both source and sink 10mA into a load with symmetrical drive and is ideally suited for applications where push-pull voltage drive is desired. The offset voltage is trimmed on-chip to eliminate the need for external nulling in many applications. For precision applications, the output is designed to settle to 0.1% in 2s. For large signal buffer applications, the operational amplifier can function as an ultra high input impedance voltage follower/buffer that allows input and output voltage swings from positive to negative supply voltages. This feature is intended to greatly simplify systems design and eliminate higher voltage power supplies in many applications. ORDERING INFORMATION
-55C to +125C 8-Pin CERDIP Package ALD1704A DA ALD1704B DA ALD1704 DA ALD1704G DA Operating Temperature Range 0C to +70C 0C to +70C 8-Pin Small Outline Package (SOIC) ALD1704A SA ALD1704B SA ALD1704 SA ALD1704G SA 8-Pin Plastic Dip Package ALD1704A PA ALD1704B PA ALD1704 PA ALD1704G PA
FEATURES * * * * * * * * * * * Rail-to-rail input and output voltage ranges 5.0V/s slew rate Output settles to 2mV of supply rails High capacitive load capability -- up to 4000pF Symmetrical push-pull output drives No frequency compensation required -unity gain stable Extremely low input bias currents -- 1.0pA typical (20pAMax) Ideal for high source impedance applications High voltage gain -- typically 150V/mV Output short circuit protected Unity gain bandwidth of 2.1MHz
APPLICATIONS * * * * * * * * * * * * * * * Voltage amplifier Voltage follower/buffer Charge integrator Photodiode amplifier Data acquisition systems High performance portable instruments Signal conditioning circuits Low leakage amplifiers Active filters Sample/Hold amplifier Picoammeter Current to voltage converter Coaxial cable driver Capacitive sensor amplifier Piezoelectric transducer amplifier
PIN CONFIGURATION
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 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 = 5.0V 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 Output Voltage Range Output Short Circuit Current Supply Current Power Dissipation Input Capacitance Bandwidth Slew Rate Rise time Overshoot Factor Symbol Min VS V+ VOS IOS IB VIR -5.3 1012 5 70 70 50 40 VO low VO high VO low VO high ISC IS PD CIN -4.96 -4.90 4.95 -4.998 -4.99 4.99 4.998 4.90 15 3.0 30 1 4.5 45 80 83 150 150 65 65 50 40 4.90 -4.96 4.95 -4.998 4.99 4.998 15 3.0 30 1 4.5 45 -4.90 -4.99 1.0 1.0 3.25 6.5 1704A Typ Max 6.0 12.0 0.9 1.7 15 240 20 300 +5.3 -5.3 1012 5 80 83 150 150 65 65 50 40 -4.96 -4.90 4.95 -4.998 -4.99 4.99 4.998 4.90 15 3.0 30 1 4.5 45 1.0 1.0 Min 3.25 6.5 1704B Typ Max 6.0 12.0 2.0 2.8 15 240 20 300 +5.3 -5.3 1012 5 80 83 150 150 60 60 32 20 -4.96 -4.90 4.95 -4.998 -4.99 4.99 4.998 4.90 15 3.0 30 1 5.0 50 1.0 1.0 Min 3.25 6.5 1704 Typ Max 6.0 12.0 4.5 5.3 15 240 20 300 +5.3 1.0 1.0 5.0 Min 3.25 6.5 1704G Typ Max 6.0 12.0 10.0 11.0 25 240 30 300 Unit V V mV mV pA pA pA pA V V/C dB dB V/ mV V/ mV V/ mV
V
Test Conditions Dual Supply Single Supply RS 100K 0C TA +70C TA = 25C 0C TA +70C TA = 25C 0C TA +70C
RIN TCVOS PSRR CMRR AV
1012 7 80 83 150 150
RS 100K R S 100K 0C TA +70C RS 100K 0C TA +70C RL = 10K No Load 0C TA +70C
R L = 10K 0C TA +70C R L =1M 0C TA +70C
V mA mA mW pF
VIN = 0V No Load VS = 5.0 No Load
BW SR tr
2.1 5.0 0.1 15
2.1 5.0 0.1 15
2.1 5.0 0.1 15
2.1 5.0 0.1 15
MHz V/s s % AV = +1 RL = 2.0K RL = 2.0K RL = 2.0K CL = 100pF
ALD1704A/ALD1704B ALD1704/ALD1704G
Advanced Linear Devices
2
OPERATING ELECTRICAL CHARACTERISTICS (cont'd) T A = 25C VS = 5.0V unless otherwise specified
Parameter Maximum Load Capacitance Symbol CL Min 1704A Typ Max 400 4000 Min 1704B Typ Max 400 4000 Min 1704 Typ 400 4000 Max Min 1704G Typ Max 400 4000 Unit pF pF Test Conditions Gain = 1 Gain = 5
Input Noise Voltage
en
26
26
26
26
nV/Hz
f = 1KHZ
Input Current Noise
in
0.6
0.6
0.6
0.6
fA/HZ
f = 10HZ
Settling Time
ts
5.0 2.0
5.0 2.0
5.0 2.0
5.0 2.0
s s
0.01% 0.1% AV = -1 RL = 5K CL = 50pF
VS = 5.0V -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 Symbol VOS IOS IB PSRR 60 75 1704A DA Min Typ Max 2.0 8.0 10.0 60 75 1704B DA Min Typ Max 4.0 8.0 10.0 60 75 Min 1704DA Typ Max 7.0 8.0 10.0 Unit mV nA nA dB R S 100K Test Conditions RS 100K
CMRR
60
83
60
83
60
83
dB
RS 100K
AV
30
125
30
125
30
125
V/mV
RL = 10K
VO low VO high
4.8
-4.9 4.9
-4.8 4.8
-4.9 4.9
-4.8 4.8
-4.9 4.9
-4.8
V V
RL = 10K RL = 10K
ALD1704A/ALD1704B ALD1704/ALD1704G
Advanced Linear Devices
3
Design & Operating Notes:
1. The ALD1704 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. The ALD1704 is internally compensated for unity gain stability using a novel scheme that 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 ALD 1704 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 ALD1704 has shown itself to be more resistant to parasitic oscillations. 2. The ALD1704 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 ALD1704 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 (10V operation), where the common mode voltage does not make excursions below this switching point. 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. 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 symmetrical class AB complementary output drivers, capable of driving a low resistance load with up to 10mA source current and 10mA sink current. 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 the ALD1704 an effective analog signal buffer for medium to high source impedance sensors, transducers, and other circuit networks. 5. The ALD1704 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 TA = 25C
OPEN LOOP VOLTAGE GAIN AS A FUNCTION OF SUPPLY VOLTAGE AND TEMPERATURE
1000 } -55C
COMMON MODE INPUT VOLTAGE RANGE (V)
OPEN LOOP VOLTAGE GAIN (V/mV)
6 5 4 3 2 2 3 4 5 6 7 SUPPLY VOLTAGE (V)
} +25C 100 } +125C 10 RL= 10K RL= 5K 1 0 2 4 SUPPLY VOLTAGE (V) 6 8
INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE
10000 5
SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE
SUPPLY CURRENT (mA)
INPUTS GROUNDED OUTPUT UNLOADED
INPUT BIAS CURRENT (pA)
1000 100
VS = 5.0V
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)
ALD1704A/ALD1704B ALD1704/ALD1704G
Advanced Linear Devices
4
TYPICAL PERFORMANCE CHARACTERISTICS
OUTPUT VOLTAGE SWING AS A FUNCTION OF SUPPLY VOLTAGE
120
OPEN LOOP VOLTAGE AS A FUNCTION OF FREQUENCY
100
7
OUTPUT VOLTAGE SWING (V)
OPEN LOOP VOLTAGE GAIN (dB)
6 5 4 3 2 0
25C TA 125C
RL = 10K RL = 10K
PHASE SHIFT IN DEGREES
80 60 40 20 0 -20
VS = 5.0V TA = 25C 0 45 90 135 180 1 10 100 1K 10K 100K 1M 10M
RL = 2K
1
2
3
4
5
6
7
SUPPLY VOLTAGE (V)
FREQUENCY (Hz)
INPUT OFFSET VOLTAGE AS A FUNCTION OF AMBIENT TEMPERATURE REPRESENTATIVE UNITS
INPUT OFFSET VOLTAGE (mV)
INPUT OFFSET VOLTAGE AS A FUNCTION OF COMMON MODE INPUT VOLTAGE
15
VS = 5.0V
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 = 5.0V TA = 25C
+75
+100 +125
-4
-2
0
+2
+4
+6
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 VS = 5.0V TA = 25C RL = 1K CL = 50pF
OPEN LOOP VOLTAGE GAIN (V/mV)
100
VS = 5.0V TA = 25C
10
5V/div
2s/div
1 1K 10K 100K 1000K
LOAD RESISTANCE ()
VOLTAGE NOISE DENSITY AS A FUNCTION OF FREQUENCY
150
SMALL - SIGNAL TRANSIENT RESPONSE
100mV/div VS = 5.0V TA = 25C RL = 1.0K CL = 50pF
VOLTAGE NOISE DENSITY (nV/ Hz)
125 100 75 50 25
50mV/div
VS = 5.0V TA = 25C
1s/div
0 10 100 1K 10K 100K 1000K
FREQUENCY (Hz)
ALD1704A/ALD1704B ALD1704/ALD1704G
Advanced Linear Devices
5
TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER
+10V 0.1F
RAIL-TO-RAIL VOLTAGE COMPARATOR
+12V
= ZIN ~ 1012
VIN 0 VIN 10V
+
CL 400pF
VOUT RL 1.5K
VIN +12V 50K
+
10M
0.1F VOUT
LOW OFFSET SUMMING AMPLIFIER
PHOTO DETECTOR CURRENT TO VOLTAGE CONVERTER
RF = 5M
10K INPUT 1 INPUT 2 10K GAIN = 5 * Circuit Drives Large Load Capacitance 4000pF
50K
+5V
0.1F
I
VOUT
+
-5V 0.1F
PHOTODIODE
+
+5V
VOUT = I X RF RL 1.5K
CL = 4000pF
-5V
WIEN BRIDGE OSCILLATOR (RAIL-TO -RAIL) SINE WAVE GENERATOR
+5V VOUT
C1 VIN
BANDPASS NETWORK
C2 R2 R1
-
+
.01F R = 10K
+5V VOUT
-5V 10K 10K
10K
+
C = .01F
-5V
Low Frequency Breakpoint L = High Frequency Cutoff H =
1 ~ ~ f= = 1.6K Hz 2RC
1 = 160Hz 2 R1 C1 1 = 32KHz 2 R2C2 R1 = 10K C1 = 100nF R2 = 10K C2 = 500pF
LOW PASS FILTER (RFI FILTER)
RF 5K VIN R1 C1 5K R1 0.02F +9V 100K
PRECISION CHARGE INTEGRATOR
1000pF
VOUT
1M VIN
+5V
VOUT
+
+
-5V
1 Cutoff frequency = = 3.2kHz R1C1 Gain = 10 Frequency roll-off 20dB/decade
ALD1704A/ALD1704B ALD1704/ALD1704G
Advanced Linear Devices
6

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