ALD ALD2704A Dual rail-to-rail cmos operational amplifier Datasheet

ADVANCED
LINEAR
DEVICES, INC.
ALD2704A/ALD2704B
ALD2704
DUAL RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
FEATURES
The ALD2704A/ALD2704B/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 ALD2704A/ALD2704B/
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 ±5V power supplies are being used. The ALD2704A/
ALD2704B/ALD2704 offers high slew rate of 5V/µs. 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 ALD2704A/ALD2704B/
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 1.5KΩ 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 2µs. 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. Additionally, robust design
and rigorous screening make this device especially suitable for operation
in temperature-extreme environments and rugged conditions.
ORDERING INFORMATION (“L” suffix denotes lead-free (RoHS))
0°C to +70°C
Operating Temperature Range
0°C to +70°C
-55°C to 125°C
8-Pin
Small Outline
Package (SOIC)
8-Pin
Plastic Dip
Package
8-Pin
CERDIP
Package
ALD2704ASAL
ALD2704BSAL
ALD2704SAL
ALD2704APAL
ALD2704BPAL
ALD2704PAL
ALD2704ADA
ALD2704BDA
ALD2704DA
•
Rail-to-rail input and output voltage ranges
Symmetrical push-pull output drives
Output settles to 2mV of supply rails
5.0V/µs 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
Suitable for rugged, temperature-extreme
environments
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
OUT A
1
8
V+
-IN A
2
7
OUT B
+IN A
3
6
-IN B
V-
4
5
+IN B
TOP VIEW
SAL, PAL, DA PACKAGES
* Contact factory for leaded (non-RoHS) or high temperature versions.
Rev 2.0 ©2010 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286
www.aldinc.com
ABSOLUTE MAXIMUM RATINGS
Supply voltage, V+ referenced to VSupply voltage, VS referenced to VDifferential input voltage range
Power dissipation
Operating tempurature range SAL, PAL packages
DA package
Storage tempurature range
Lead tempurature, 10 seconds
CAUTION: ESD Sensitive Device. Use static control procedures in ESD controlled environment.
-0.3V to V++10.6V
±5.3V
-0.3V to V+ +0.3V
600 mW
0°C to +70°C
-55°C to +125°C
-65°C to +150°C
+260°C
OPERATING ELECTRICAL CHARACTERISTICS
TA = 25°C VS = ±5.0V unless otherwise specified
Min
2704A
Typ
Symbol
Supply
Voltage
VS
V+
Input Offset
Voltage
VOS
Input Offset
Current
IOS
1.0
15
240
1.0
15
240
Input Bias
Current
IB
1.0
20
300
1.0
20
300
Input Voltage
Range
VIR
Input
Resistance
RIN
Input Offset
Voltage Drift
TCVOS
Power Supply
Rejection Ratio
PSRR
65
80
65
80
60
Common Mode
Rejection Ratio
CMRR
65
83
65
83
Large Signal
Voltage Gain
AV
15
28
100
15
28
100
Output
Voltage
Range
VO low
VO high
VO low
VO high
±3.25
6.5
Max
Min
2704B
Typ Max
Parameter
±5.0 ±3.25
10.0
6.5
4.90
4.99
5.3
2704
Typ
Unit
Test
Conditions
V
V
Dual Supply
Single Supply
5.0
6.0
mV
mV
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
1.0
15
240
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
1.0
20
300
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
5.3
V
±5.0 ±3.25
10.0
6.5
1.0
1.5
-5.3
Min
±5.0
10.0
2.0
3.0
-5.3
5.3
Max
-5.3
1012
1012
1012
5
5
5
Ω
µV/°C
RS ≤ 100KΩ
80
dB
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
60
83
dB
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
10
28
100
V/mV
V/mV
RL = 100KΩ
RL ≥ 1MΩ
-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
ISC
15
Supply
Current
IS
5.0
Power
Dissipation
PD
Input
Capacitance
CIN
1
1
1
Bandwidth
BW
2.1
2.1
2.1
MHz
Slew Rate
SR
5.0
5.0
5.0
V/µs
AV = +1 RL = 2.0KΩ
Rise time
tr
0.1
0.1
0.1
µs
RL = 2.0KΩ
15
15
15
%
RL = 2.0KΩ
CL = 100pF
ALD2704A/ALD2704B
ALD2704
6.5
5.0
65
15
V
RL ≥ 10KΩ
0°C ≤ TA ≤ +70°C
RL = 1MΩ
0°C ≤ TA ≤ +70°C
Output Short
Circuit Current
Overshoot
Factor
15
V
6.5
5.0
65
Advanced Linear Devices
mA
6.5
65
mA
mW
VIN = -5V
No Load
Both amplifiers, No Load
VS = ±5.0V
pF
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OPERATING ELECTRICAL CHARACTERISTICS (cont'd)
TA = 25°C VS = ±5.0V unless otherwise specified
2704A
Min
Typ
2704B
Max
Min
Typ
2704
Parameter
Symbol
Max
Min
Typ
Maximum Load
Capacitance
CL
400
4000
400
4000
400
4000
Input Noise
Voltage
en
26
26
Input Current
Noise
in
0.6
Settling
Time
ts
5.0
2.0
Max
Unit
Test Conditions
pF
pF
Gain = 1
Gain = 5
26
nV/√Hz
f =1KHz
0.6
0.6
fA/√Hz
f =10Hz
5.0
2.0
5.0
2.0
µs
µs
0.01%
0.1% AV = 1
RL = 5KΩ CL= 50pF
VS = ±5.0V -55°C ≤ TA ≤ +125°C unless otherwise specified
Min
2704ADA
Typ Max
2704DA
Typ
Max
Unit
Test Conditions
4.0
7.0
mV
RS ≤ 100KΩ
8.0
8.0
8.0
nA
10.0
10.0
10.0
nA
Min
2704BDA
Typ Max
Parameter
Symbol
Min
Input Offset
Voltage
VOS
2.0
Input Offset
Current
IOS
Input Bias
Current
IB
Power Supply
PSRR
60
75
60
75
60
75
dB
RS ≤ 100KΩ
Common Mode
Rejection Ratio
CMRR
60
83
60
83
60
83
dB
RS ≤ 100KΩ
Large Signal
AV
10
25
10
25
10
25
V/mV
RL = 10KΩ
VO low
VO high
4.8
-4.9
4.9
4.8
-4.9
4.9
4.8
-4.9
4.9
V
RL = 10KΩ
Rejection Ratio
Voltage Gain
Output Voltage
Range
ALD2704A/ALD2704B
ALD2704
-4.8
-4.8
Advanced Linear Devices
-4.8
3 of 9
Design & Operating Notes:
1. The ALD2704A/ALD2704B/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 ALD2704A/ALD2704B/
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
ALD2704A/ALD2704B/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 ALD2704A/ALD2704B/
ALD2704 is much more resistant to parasitic oscillations.
2. The ALD2704A/ALD2704B/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 ALD2704A/ALD2704B/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 railto-rail input and output feature, makes the ALD2704A/ALD2704B/
ALD2704 an effective analog signal buffer for medium to high source
impedance sensors, transducers, and other circuit networks.
5. The ALD2704A/ALD2704B/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 100KΩ 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
OPEN LOOP VOLTAGE GAIN AS A FUNCTION
OF SUPPLY VOLTAGE AND TEMPERATURE
COMMON MODE INPUT VOLTAGE RANGE
AS A FUNCTION OF SUPPLY VOLTAGE
1000
±7
OPEN LOOP VOLTAGE
GAIN (V/mV)
COMMON MODE INPUT
VOLTAGE RANGE (V)
TA = 25°C
±6
±5
±4
} -55°C
} +25°C
100
} +125°C
10
±3
RL= 10KΩ
RL= 5KΩ
1
±2
±3
±2
±5
±4
±6
0
±7
±2
INPUT BIAS CURRENT AS A FUNCTION
OF AMBIENT TEMPERATURE
±8
±6
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
10000
8
SUPPLY CURRENT (mA)
INPUT BIAS CURRENT (pA)
±4
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
VS = ±5.0V
1000
100
10
1.0
INPUTS GROUNDED
OUTPUT UNLOADED
7
6
5
TA = -55°C
4
-25°C
+25°C
+80°C
+125°C
3
2
1
0
0.1
-50
-25
0
25
50
75
100
125
AMBIENT TEMPERATURE (°C)
ALD2704A/ALD2704B
ALD2704
0
±1
±2
±3
±4
±5
±6
±7
SUPPLY VOLTAGE (V)
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TYPICAL PERFORMANCE CHARACTERISTICS (cont'd)
OUTPUT VOLTAGE SWING AS A
FUNCTION OF SUPPLY VOLTAGE
OPEN LOOP VOLTAGE AS A FUNCTION
OF FREQUENCY
120
-55°C ≤ TA ≤ 125°C
100
OPEN LOOP VOLTAGE
GAIN (dB)
±6
RL = 10KΩ
RL = 10KΩ
±5
±4
RL = 2KΩ
±3
VS = ±5.0V
TA = 25°C
80
60
0
40
45
20
90
0
135
±2
0
±1
±2
±3
±4
±5
±6
180
-20
±7
1
SUPPLY VOLTAGE (V)
10
100
1K
10K
100K
1M
PHASE SHIFT IN DEGREES
OUTPUT VOLTAGE SWING (V)
±7
10M
FREQUENCY (Hz)
+5
+4
INPUT OFFSET VOLTAGE AS A FUNCTION
OF COMMON MODE INPUT VOLTAGE
15
INPUT OFFSET VOLTAGE (mV)
INPUT OFFSET VOLTAGE (mV)
INPUT OFFSET VOLTAGE AS A FUNCTION
OF AMBIENT TEMPERATURE
REPRESENTATIVE UNITS
VS = ±5.0V
+3
+2
+1
0
-1
-2
-3
-4
VS = ±5.0V
TA = 25ºC
10
5
0
-5
-10
-15
-5
-50
-25
0
+25
+50
+75
-4
+100 +125
AMBIENT TEMPERATURE (°C)
0
+2
+4
+6
VOLTAGE NOISE DENSITY AS A
FUNCTION OF FREQUENCY
OPEN LOOP VOLTAGE GAIN AS A
FUNCTION OF LOAD RESISTANCE
150
VOLTAGE NOISE DENSITY
(nV/ √ Hz)
1000
OPEN LOOP VOLTAGE
GAIN (V/mV)
-2
COMMON MODE INPUT VOLTAGE (V)
100
VS = ±5.0V
TA = 25°C
10
125
VS = ±5.0V
TA = 25°C
100
75
50
25
0
1
1K
10K
100K
1000K
10
100
LOAD RESISTANCE (Ω)
LARGE - SIGNAL TRANSIENT
RESPONSE
10K
100K
1000K
SMALL - SIGNAL TRANSIENT
RESPONSE
5V/div
VS = ±5.0V
TA = 25°C
RL = 1KΩ
CL = 50pF
5V/div
2µs/div
ALD2704A/ALD2704B
ALD2704
1K
FREQUENCY (Hz)
Advanced Linear Devices
100mV/div
50mV/div
VS = ± 5.0V
TA = 25°C
RL = 1.0KΩ
CL = 50pF
1µs/div
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TYPICAL APPLICATIONS
RAIL-TO-RAIL VOLTAGE FOLLOWER/BUFFER
RAIL-TO-RAIL VOLTAGE COMPARATOR
+12V
+10V
= 1012Ω
ZIN ~
0.1µF
VIN
VIN
CL
+
400pF
VOUT
RL ≥ 1.5KΩ
0 ≤ VIN ≤ 10V
0.1µF
-
+12V
VOUT
+
50K
10M
LOW OFFSET SUMMING AMPLIFIER
PHOTO DETECTOR CURRENT
TO VOLTAGE CONVERTER
RF = 5M
10K
50K
+5V
INPUT 1
0.1µF
I
-
INPUT 2
10K
VOUT
GAIN = 5
+
* Circuit Drives Large Load
Capacitance ≤ 4000pF
+5V
-
CL = 4000pF
RL ≥ 1.5K
+
-5V
-5V
0.1µF
BANDPASS NETWORK
WIEN BRIDGE OSCILLATOR (RAIL-TO -RAIL)
SINE WAVE GENERATOR
C2
R2
+5V
-
C1
VOUT
+
10K
-5V
R1
VIN
-
+5V
VOUT
+
.01µF
R = 10K
C = .01µF
Low Frequency
Breakpoint ƒL =
10K
High Frequency
Cutoff ƒH =
RF
R1
C1
1
= 160Hz
2π R1C1
1
= 32KHz
2π R2 C 2
100K
1000pF
5K
R1
R1 = 10K C1 = 100nF
R2 = 10K C2 = 500pF
PRECISION CHARGE INTEGRATOR
LOW PASS FILTER (RFI FILTER)
VIN
-5V
10K
1
~
~ 1.6K Hz
f=
=
2πRC
5K
VOUT = I X RF
PHOTODIODE
+9V
-
0.02µF
VOUT
+5V
1MΩ
VIN
-
+
VOUT
+
-5V
Cutoff frequency = 1 = 3.2kHz
π R1C1
Gain = 10 Frequency roll-off 20dB/decade
ALD2704A/ALD2704B
ALD2704
Advanced Linear Devices
6 of 9
SOIC-8 PACKAGE DRAWING
8 Pin Plastic SOIC Package
E
Millimeters
Dim
S (45°)
D
A
Min
1.35
Max
1.75
Min
0.053
Max
0.069
A1
0.10
0.25
0.004
0.010
b
0.35
0.45
0.014
0.018
C
0.18
0.25
0.007
0.010
D-8
4.69
5.00
0.185
0.196
E
3.50
4.05
0.140
0.160
1.27 BSC
e
A
A1
e
Inches
0.050 BSC
H
5.70
6.30
0.224
0.248
L
0.60
0.937
0.024
0.037
ø
0°
8°
0°
8°
S
0.25
0.50
0.010
0.020
b
S (45°)
H
L
ALD2704A/ALD2704B
ALD2704
C
ø
Advanced Linear Devices
7 of 9
PDIP-8 PACKAGE DRAWING
8 Pin Plastic DIP Package
Millimeters
E
E1
D
S
A2
A1
e
b
A
L
Dim
Min
Max
Min
Max
A
3.81
5.08
0.105
0.200
A1
0.38
1.27
0.015
0.050
A2
1.27
2.03
0.050
0.080
b
0.89
1.65
0.035
0.065
b1
0.38
0.51
0.015
0.020
c
0.20
0.30
0.008
0.012
D-8
9.40
11.68
0.370
0.460
E
5.59
7.11
0.220
0.280
E1
7.62
8.26
0.300
0.325
e
2.29
2.79
0.090
0.110
e1
7.37
7.87
0.290
0.310
L
2.79
3.81
0.110
0.150
S-8
1.02
2.03
0.040
0.080
0°
15°
0°
15°
ø
b1
Inches
c
e1
ALD2704A/ALD2704B
ALD2704
ø
Advanced Linear Devices
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CERDIP-8 PACKAGE DRAWING
8 Pin CERDIP Package
E E1
Millimeters
D
A1
s
A
L
L2
b
b1
e
L1
Inches
Dim
A
Min
Max
3.55
5.08
Min
0.140
Max
0.200
A1
1.27
2.16
0.050
0.085
b
0.97
1.65
0.038
0.065
b1
0.36
0.58
0.014
0.023
C
0.20
0.38
0.008
0.015
D-8
--
10.29
--
0.405
E
5.59
7.87
0.220
0.310
E1
7.73
8.26
0.290
0.325
e
2.54 BSC
0.100 BSC
e1
7.62 BSC
0.300 BSC
L
3.81
5.08
0.150
0.200
L1
3.18
--
0.125
--
L2
0.38
1.78
0.015
0.070
S
--
2.49
--
0.098
Ø
0°
15°
0°
15°
C
e1
ALD2704A/ALD2704B
ALD2704
ø
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