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ADVANCED LINEAR DEVICES, INC.
ALD2704A/ALD2704B ALD2704
DUAL RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION The ALD2704 is a dual 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. With high impedance load, the output voltage of the ALD2704 approaches within 1mV of the power supply rails. This device is designed as an alternative to the popular J-FET input operational amplifier in applications where lower operating voltages, such as 9V battery or 3.25V to 6V power supplies are being used. The ALD2704 offers high slew rate of 5V/s. It is designed and manufactured with Advanced Linear Devices' standard enhanced ACMOS silicon gate CMOS process, and it offers low unit cost and exceptional reliability. The rail-to-rail input and output feature of the ALD2704 expands signal voltage range for a given operating supply voltage 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 4000pF 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 source and sink 10mA into a load with symmetrical drive and is ideally suited for applications where push-pull voltage drive is desired. For each of the operational amplifier, 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. In large signal buffer applications, the operational amplifier can function as an ultrahigh 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.
FEATURES * * * * * * * * * * * Rail-to-rail input and output voltage ranges Symmetrical push-pull output drives Output settles to 2mV of supply rails 5.0V/s slew rate High capacitive load capability -- up to 4000pF No frequency compensation required -- unity gain stable Extremely low input bias currents -- <1.0pA typical (20pA max.) Ideal for high source impedance applications High voltage gain -- typically 100V/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
ORDERING INFORMATION
Operating Temperature Range* -55C to +125C 0C to +70C 0C to +70C 8-Pin CERDIP Package ALD2704A DA ALD2704B DA ALD2704 DA 8-Pin Small Outline Package (SOIC) ALD2704A SA ALD2704B SA ALD2704 SA 8-Pin Plastic Dip Package ALD2704A PA ALD2704B PA ALD2704 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+ referenced to VSupply voltage, VS referenced to VDifferential input voltage range Power dissipation Operating temperature range PA, SA package DA package Storage temperature range Lead temperature, 10 seconds -0.3V to V++13.2V 6.6V -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 Symbol VS V+ VOS IOS IB VIR RIN TCVOS PSRR 65 -5.3 1.0 1.0 Min 3.25 6.5 2704A Typ Max Min 2704B Typ Max Min 2704 Typ Max 6.0 12.0 5.0 6.0 1.0 1.0 -5.3 15 240 20 300 5.3 Unit V V mV mV pA pA pA pA V V/C dB RS 100K R S 100K 0C TA +70C RS 100K 0C TA +70C RL = 100K RL 1M R L 10K 0C TA +70C R L = 1M 0C TA +70C Test Conditions Dual Supply Single Supply RS 100K 0C TA +70C TA = 25C 0C TA +70C TA = 25C 0C TA +70C
6.0 3.25 12.0 6.5 1.0 1.5 15 240 20 300 5.3 -5.3 1.0 1.0
6.0 3.25 12.0 6.5 2.0 3.0 15 240 20 300 5.3
10 12
10 12
1012
5 80 65
5 80 60
5 80
CMRR
65
83
65
83
60
83
dB
AV
15
28 100
15
28 100
10
28 100
V/mV V/mV
VO low VO high VO low VO high ISC IS PD
4.90 4.99
-4.96 -4.90 -4.96 -4.90 -4.96 -4.90 4.95 4.90 4.95 4.90 4.95 -4.998 -4.99 -4.998 -4.99 -4.998 -4.99 4.998 4.99 4.998 4.99 4.998 15 5.0 6.5 15 5.0 6.5 15 5.0 6.5
V V mA mA
Output Short Circuit Current Supply Current Power Dissipation Input Capacitance Bandwidth Slew Rate Rise time Overshoot Factor
VIN = -5V No Load Both amplifiers, No Load VS = 5.0V
65
65
65
mW
CIN
1
1
1
pF
BW SR tr
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
ALD2704A/ALD2704B ALD2704
Advanced Linear Devices
2
OPERATING ELECTRICAL CHARACTERISTICS (cont'd) TA = 25C VS = 5.0V unless otherwise specified
2704A Parameter Maximum Load Capacitance Symbol CL Min Typ 400 4000 Max Min 2704B Typ 400 4000 Max Min 2704 Typ 400 4000 Max Unit pF pF Test Conditions Gain = 1 Gain = 5
Input Noise Voltage
en
26
26
26
nV/Hz
f =1KHz
Input Current Noise
in
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
s s
0.01% 0.1% AV = 1 RL = 5K CL= 50pF
VS = 5.0V -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 Min 2704ADA Typ Max 2.0 Min 2704BDA Typ Max 4.0 Min 2704DA Typ Max 7.0 Unit mV Test Conditions RS 100K
IOS
8.0
8.0
8.0
nA
IB
10.0
10.0
10.0
nA
PSRR
60
75
60
75
60
75
dB
RS 100K
CMRR
60
83
60
83
60
83
dB
RS 100K
AV
10
25
10
25
10
25
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 RL = 10K
ALD2704A/ALD2704B ALD2704
Advanced Linear Devices
3
Design & Operating Notes:
1. The ALD2704 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 ALD2704 is internally compensated for unity gain stability using a novel scheme. This design 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 ALD2704 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 ALD2704 is much more resistant to parasitic oscillations. 2. The ALD2704 has complementary p-channel and n-channel input differential stages connected in parallel to accomplish rail to rail input common mode voltage range. With the 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. As offset voltage trimming on the ALD2704 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 greater 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 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. The voltage follower configuration, the oscillation and resistant with the rail- to-rail input and output feature, makes the ALD2704 an effective analog signal buffer for medium to high source impedance sensors, transducers, and other circuit networks. 5. The ALD2704 operational amplifier has been designed to provide 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. 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. Alternatively, a 100K or higher value resistor at the input terminals will limit input currents to acceptable levels while causing very small or negligible accuracy effects.
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)
6
OPEN LOOP VOLTAGE GAIN (V/mV)
} +25C 100 } +125C 10 RL = 10K RL = 5K 1 0 2 4 SUPPLY VOLTAGE (V) 6 8
5 4 3 2 2 3 4 5 6 7 SUPPLY VOLTAGE (V)
INPUT BIAS CURRENT AS A FUNCTION OF AMBIENT TEMPERATURE
10000 8
SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE
7 6 5 4 3 2 1 TA = -55C -25C +25C +80C +125C INPUTS GROUNDED OUTPUT UNLOADED
INPUT BIAS CURRENT (pA)
1000 100
10
1.0 0.1 -50 -25 0 25 50 75 100 125
SUPPLY CURRENT (mA)
VS = 5.0V
0
0 1 2 3 4 5 6 7
AMBIENT TEMPERATURE (C)
SUPPLY VOLTAGE (V)
ALD2704A/ALD2704B ALD2704
Advanced Linear Devices
4
TYPICAL PERFORMANCE CHARACTERISTICS
OUTPUT VOLTAGE SWING AS A FUNCTION OF SUPPLY VOLTAGE
120
OPEN LOOP VOLTAGE GAIN (dB)
25C TA 125C
RL = 10K
OPEN LOOP VOLTAGE AS A FUNCTION OF FREQUENCY
100 80 60 40 20 0 -20
7
OUTPUT VOLTAGE SWING (V)
6 5 4 3 2 0
PHASE SHIFT IN DEGREES
VS = 5.0V TA = 25C 0 45 90 135 180 1 10 100 1K 10K 100K 1M 10M
RL = 10K 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)
VS = 5.0V
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 = 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 0 10 100 1K 10K 100K 1000K
50mV/div
VS = 5.0V TA = 25C
1s/div
ALD2704A/ALD2704B ALD2704
FREQUENCY (Hz)
Advanced Linear Devices
5
TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER RAIL-TO-RAIL VOLTAGE COMPARATOR
+12V
= ZIN ~ 1012 +10V 0.1F
VIN 0 VIN 10V
VIN
VOUT RL 1.5K
+
10M
0.1F VOUT
+12V 50K
+
CL 400pF
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
PHOTODIODE
+
+5V
VOUT = I X RF RL 1.5K
+
-5V 0.1F
CL = 4000pF
-5V
WIEN BRIDGE OSCILLATOR (RAIL-TO -RAIL) SINE WAVE GENERATOR
+5V VOUT
BANDPASS NETWORK
C2 R2 C1 VIN R1
-
+
.01F R = 10K ~ f=
+5V VOUT
-5V 10K 10K
10K
+
C = .01F
-5V
1 ~ = 1.6K Hz 2RC
Low Frequency Breakpoint L =
1 = 160Hz 2 R1C1 1 = 32KHz 2 R2 C 2
High Frequency Cutoff H =
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
Cutoff frequency =
1 = 3.2kHz R1C1
Gain = 10 Frequency roll-off 20dB/decade
ALD2704A/ALD2704B ALD2704
Advanced Linear Devices
6

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