quad rail-to-rail cmos operational amplifier ald4704a/ald4704b

ADVANCED
LINEAR
DEVICES, INC.
ALD4704A/ALD4704B
ALD4704
QUAD RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
FEATURES
The ALD4704A/ALD4704B/ALD4704 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.
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With high impedance load, the output voltage of the ALD4704A/
ALD4704B/ALD4704 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
ALD4704A/ALD4704B/ALD4704 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 ALD4704A/ALD4704B/
ALD4704 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 onchip 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))
Operating Temperature Range
0°C to +70°C
0°C to +70°C
-55°C to 125°C
14-Pin
Small Outline
Package (SOIC)
14-Pin
Plastic Dip
Package
14-Pin
CERDIP
Package
ALD4704ASBL
ALD4704BSBL
ALD4704SBL
ALD4704APBL
ALD4704BPBL
ALD4704PBL
ALD4704ADB
ALD4704BDB
ALD4704DB
* Contact factory for leaded (non-RoHS) or high temperature versions.
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Rail-to-rail input and output voltage ranges
5.0V/µs slew rate
Symmetrical push-pull output drive
Inputs can extend beyond supply rails by 300mV
Outputs settle to 2mV of supply rails
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 -- 100V/mV typical
Output short circuit protected
Unity gain bandwidth of 2.1MHz
Suitable for rugged, temperature-extreme
environments
APPLICATIONS
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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
14
OUT D
-IN A
2
13
-IN D
+IN A 3
12
+IN D
V+
4
11
V-
+IN B 5
10
+IN C
-IN B
6
9
-IN C
OUT B
7
8
OUT C
TOP VIEW
SBL, PBL, DB PACKAGES
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 SBL, PBL packages
DB 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
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
Output Short
Circuit Current
ISC
15
Supply
Current
IS
10
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 = 10KΩ
15
15
15
%
RL = 10KΩ
CL = 100pF
ALD4704A/ALD4704B
ALD4704
Min
±5.0 ±3.25
10.0
6.5
5.3
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
4704
Typ
Supply
Voltage
±3.25
6.5
Max
4704B
Typ Max
Symbol
Overshoot
Factor
Min
4704A
Typ
Parameter
±5.0
10.0
2.0
3.0
-5.3
5.3
-5.3
1012
1012
1012
5
5
5
-4.96
4.95
-4.998
4.99 4.998
-4.90
4.90
-4.96 -4.90
4.95
-4.998 -4.99
4.99 4.998
4.90
-4.99
10
130
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
V/mV
RL = 100KΩ
RL ≥ 1MΩ
RL = 10KΩ
V
V
V
V
RL = 10KΩ
0°C ≤ TA ≤ +70°C
RL ≥ 1MΩ
0°C ≤ TA ≤ +70°C
-4.96
4.95
-4.998
4.99 4.998
-4.90
4.90
15
13
Max
-4.99
15
13
10
130
Advanced Linear Devices
mA
13
mA
VIN = -5.0V
No Load
130
mW
All 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
4704A
Typ
Max
Min
Typ
4704
Symbol
Maximum Load
Capacitance
CL
400
4000
400
4000
400
4000
Input Noise
Voltage
en
26
26
Input Current
Noise
in
0.6
ts
5.0
2.0
Settling
Time
Min
4704B
Parameter
Max
Min
Typ
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
4704ADB
Typ Max
4704DB
Typ
Max
Unit
4.0
7.0
mV
8.0
8.0
8.0
nA
10.0
10.0
10.0
nA
Parameter
Symbol
Input Offset
Voltage
VOS
2.0
Input Offset
IOS
Min
4704BDB
Typ Max
Min
Test Conditions
RS ≤ 100KΩ
Current
Input Bias
Current
IB
Power Supply
Rejection Ratio
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
Voltage Gain
AV
10
25
10
25
10
25
V/mV
RL =10KΩ
Output Voltage
VO low
Range
VO high
ALD4704A/ALD4704B
ALD4704
-4.9
4.8
4.9
-4.8
-4.9
4.8
4.9
-4.8
-4.9
4.8
Advanced Linear Devices
4.9
-4.8
V
RL =10KΩ
V
RL =10KΩ
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Design & Operating Notes:
1. The ALD4704A/ALD4704B/ALD4704 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 ALD4704A/ALD4704B/
ALD4704 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
ALD4704A/ALD4704B/ALD4704 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 ALD4704A/ALD4704B/
ALD4704 is much more resistant to parasitic oscillations.
2. The ALD4704A/ALD4704B/ALD4704 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 ALD4704A/ALD4704B/ALD4704 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 2.5 (5V 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
when connected. In the voltage follower configuration, the oscillation
resistant feature, combined with the rail to rail input and output feature,
makes the ALD4704A/ALD4704B/ALD4704 an effective analog signal buffer for medium to high source impedance sensors, transducers,
and other circuit networks.
5. The ALD4704A/ALD4704B/ALD4704 operational amplifier has been
designed with static discharge protection and 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)
±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)
ALD4704A/ALD4704B
ALD4704
0
±1
±2
±3
±4
±5
±6
±7
SUPPLY VOLTAGE (V)
Advanced Linear Devices
4 of 9
±7
INPUT
E (V)
COMMON MODE INPUT
VOLTAGE RANGE (V)
TA = 25°C
±6
±5
TYPICAL PERFORMANCE CHARACTERISTICS (cont'd)
OPEN LOOP VOLTAGE AS A FUNCTION
OF FREQUENCY
OUTPUT VOLTAGE SWING AS A
FUNCTION OF SUPPLY VOLTAGE
120
100
OPEN LOOP VOLTAGE
GAIN (dB)
-55°C ≤ TA ≤ 125°C
±6
RL = 10KΩ
±5
RL = 10KΩ
±4
RL = 2KΩ
±3
±2
VS = ±5.0V
TA = 25°C
80
60
0
40
45
20
90
0
135
180
-20
0
±1
±2
±3
±4
±5
±6
±7
1
10
100
SUPPLY VOLTAGE (V)
1M
10M
15
INPUT OFFSET VOLTAGE (mV)
INPUT OFFSET VOLTAGE (mV)
100K
INPUT OFFSET VOLTAGE AS A FUNCTION
OF COMMON MODE INPUT VOLTAGE
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
-2
0
+2
+4
+6
COMMON MODE INPUT VOLTAGE (V)
AMBIENT TEMPERATURE (°C)
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)
10K
FREQUENCY (Hz)
INPUT OFFSET VOLTAGE AS A FUNCTION
OF AMBIENT TEMPERATURE
REPRESENTATIVE UNITS
+5
+4
1K
PHASE SHIFT IN DEGREES
OUTPUT VOLTAGE SWING (V)
±7
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
ALD4704A/ALD4704B
ALD4704
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
CL
+
400pF
VIN
VOUT
+12V
VOUT
RL ≥ 1.5KΩ
0 ≤ VIN ≤ 10V
0.1µF
+
50K
10M
PHOTO DETECTOR CURRENT
TO VOLTAGE CONVERTER
LOW OFFSET SUMMING AMPLIFIER
10K
50K
+5V
INPUT 1
RF = 5M
0.1µF
I
-
INPUT 2
10K
VOUT
GAIN = 5
+
CL = 4000pF
* Circuit Drives Large Load
Capacitance ≤ 4000pF
+
-5V
0.1µF
WIEN BRIDGE OSCILLATOR (RAIL-TO -RAIL)
SINE WAVE GENERATOR
~
f=
VIN
10K
-5V
.01µF
R = 10K
C = .01µF
V
OUT
+
-5V
10K
1
~ 1.6K Hz
=
2πRC
RF
VIN
5K
R1
R1
C1
+5V
1 MΩ
10K
BANDPASS NETWORK
LOW PASS FILTER (RFI FILTER)
5K
100K
C2
+9V
R2
-
0.02µF
C1
VOUT
+
VIN
R1
-
1
= 3.2kHz
π R1C1
Gain = 10 Frequency roll-off 20dB/decade
ALD4704A/ALD4704B
ALD4704
+5V
VOUT
+
Cutoff frequency =
RL ≥ 1.5K
-5V
1000 pF
VOUT
+
VOUT = 1 X RF
PRECISION CHARGE INTEGRATOR
+5V
-
+5V
PHOTODIODE
Low Frequency
Breakpoint ƒL =
High Frequency
Cutoff ƒH =
Advanced Linear Devices
1
= 160Hz
2π R1C1
1
= 32KHz
2π R2C2
-5V
R1 = 10K
C1 = 100nF
R2 = 10K
C2 = 500pF
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SOIC-14 PACKAGE DRAWING
14 Pin Plastic SOIC Package
Millimeters
E
S (45°)
Dim
Min
A
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-14
8.55
8.75
0.336
0.345
E
3.50
4.05
0.140
0.160
1.27 BSC
e
D
A
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
A1
e
b
S (45°)
H
L
ALD4704A/ALD4704B
ALD4704
C
ø
Advanced Linear Devices
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PDIP-14 PACKAGE DRAWING
14 Pin Plastic DIP Package
Millimeters
E
E1
D
S
A2
A1
A
L
Dim
A
Min
Inches
3.81
Max
5.08
Min
0.105
Max
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-14
17.27
19.30
0.680
0.760
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-14
1.02
2.03
0.040
0.080
ø
0°
15°
0°
15°
e
b
b1
c
e1
ALD4704A/ALD4704B
ALD4704
ø
Advanced Linear Devices
8 of 9
CERDIP-14 PACKAGE DRAWING
14 Pin CERDIP Package
Millimeters
E E1
D
A1
s
A
L
L1
L2
b
b1
e
Inches
Dim
A
Min
Max
Min
3.55
5.08
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-14
--
19.94
--
0.785
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
ALD4704A/ALD4704B
ALD4704
ø
Advanced Linear Devices
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Authorized Distributor
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