ALD ALD1704A Rail to rail cmos operational amplifier Datasheet

ADVANCED
LINEAR
DEVICES, INC.
ALD1704A/ALD1704B
ALD1704/ALD1704G
RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER
GENERAL DESCRIPTION
FEATURES
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.
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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/µs 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.
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Rail-to-rail input and output voltage ranges
5.0V/µs 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
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 1.5KΩ 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 2µs. 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
-55°C to +125°C
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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
Operating Temperature Range
0°C to +70°C
0°C to +70°C
8-Pin
CERDIP
Package
8-Pin
Small Outline
Package (SOIC)
8-Pin
Plastic Dip
Package
ALD1704A DA
ALD1704B DA
ALD1704 DA
ALD1704G DA
ALD1704A SA
ALD1704B SA
ALD1704 SA
ALD1704G SA
ALD1704A PA
ALD1704B PA
ALD1704 PA
ALD1704G PA
N/C
1
8
N/C
-IN
2
7
V+
+IN
3
6
OUT
V-
4
5
N/C
TOP VIEW
DA, PA, SA PACKAGE
* N/C Pin is internally connected. Do not connect externally.
* Contact factory for industrial temperature range
© 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
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
Parameter
Symbol Min
1704A
Typ
Max
±3.25
6.5
±6.0
12.0
Min
1704B
Typ
Max
±3.25
6.5
±6.0
12.0
Min
1704
Typ Max
±3.25
6.5
±6.0
12.0
Min
1704G
Typ
Max
±3.25
6.5
Unit
Test
Conditions
±6.0
12.0
V
V
Dual Supply
Single Supply
10.0
11.0
mV
mV
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
1.0
25
240
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
20
300
1.0
30
300
pA
pA
TA = 25°C
0°C ≤ TA ≤ +70°C
+5.3
±5.0
V
Ω
Supply
Voltage
VS
V+
Input Offset
Voltage
VOS
Input Offset
Current
IOS
1.0
15
240
1.0
15
240
1.0
15
240
Input Bias
Current
IB
1.0
20
300
1.0
20
300
1.0
Input Voltage
Range
VIR
Input
Resistance
RIN
Input Offset
Voltage Drift
TCVOS
Power Supply
Rejection Ratio
PSRR
70
80
65
80
65
80
60
Common Mode
Rejection Ratio
CMRR
70
83
65
83
65
83
Large Signal
Voltage Gain
AV
50
150
150
50
150
150
50
150
150
Output
Voltage
Range
VO low
VO high
VO low
VO high
Output Short
Circuit Current
ISC
15
Supply Current
IS
3.0
4.5
3.0
4.5
3.0
4.5
3.0
5.0
mA
VIN = 0V
No Load
Power
Dissipation
PD
30
45
30
45
30
45
30
50
mW
VS = ±5.0
No Load
Input
Capacitance
CIN
1
1
1
1
Bandwidth
BW
2.1
2.1
2.1
2.1
MHz
Slew Rate
SR
5.0
5.0
5.0
5.0
V/µs
AV = +1
RL = 2.0KΩ
Rise time
tr
0.1
0.1
0.1
0.1
µs
RL = 2.0KΩ
15
15
15
15
%
RL = 2.0KΩ
CL = 100pF
0.9
1.7
-5.3
+5.3
ALD1704A/ALD1704B
ALD1704/ALD1704G
-5.3
+5.3
4.5
5.3
-5.3
1012
1012
1012
1012
5
5
5
7
40
Overshoot
Factor
2.0
2.8
40
-4.96 -4.90
4.95
-4.998 -4.99
4.99 4.998
4.90
40
-4.96
4.95
-4.998
4.99 4.998
-4.90
4.90
15
RS ≤ 100KΩ
80
dB
R S ≤ 100KΩ
0°C ≤ TA ≤ +70°C
60
83
dB
RS ≤ 100KΩ
0°C ≤ TA ≤ +70°C
32
150
150
V/ mV
V/ mV
V/ mV
RL = 10KΩ
No Load
0°C ≤ TA ≤ +70°C
V
R L = 10KΩ
0°C ≤ TA ≤ +70°C
R L =1MΩ
0°C ≤ TA ≤ +70°C
20
-4.96 -4.90
4.95
-4.998 -4.99
4.99 4.998
4.90
-4.99
µV/°C
15
Advanced Linear Devices
-4.96 -4.90
4.95
-4.998 -4.99
4.99 4.998
4.90
15
V
mA
pF
2
OPERATING ELECTRICAL CHARACTERISTICS (cont'd)
T A = 25°C VS = ±5.0V unless otherwise specified
Min
1704B
Typ
Max
Min
1704
Typ
Max
Min
1704G
Typ Max
Symbol
Maximum Load
Capacitance
CL
400
4000
400
4000
400
4000
400
4000
Input Noise
Voltage
en
26
26
26
Input Current
Noise
in
0.6
0.6
ts
5.0
2.0
5.0
2.0
Settling
Time
Min
1704A
Typ
Max
Parameter
Unit
Test Conditions
pF
pF
Gain = 1
Gain = 5
26
nV/√Hz
f = 1KH Z
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 ≤ T A ≤ +125°C unless otherwise specified
Parameter
Symbol
1704A DA
Min
Typ Max
1704B DA
Min Typ
Max
Min
1704DA
Typ
Max
Unit
Test Conditions
RS ≤ 100KΩ
Input Offset Voltage
VOS
2.0
4.0
7.0
mV
Input Offset Current
IOS
8.0
8.0
8.0
nA
Input Bias Current
IB
10.0
10.0
10.0
nA
Power Supply
Rejection Ratio
PSRR
60
75
60
75
60
75
dB
R S ≤ 100KΩ
Common Mode
Rejection Ratio
CMRR
60
83
60
83
60
83
dB
RS ≤ 100KΩ
Large Signal
Voltage Gain
AV
30
125
30
125
30
125
V/mV
RL = 10KΩ
Output Voltage
Range
VO low
VO high
4.8
-4.9
4.9
4.8
-4.9
4.9
4.8
-4.9
4.9
V
V
RL = 10KΩ
RL = 10KΩ
ALD1704A/ALD1704B
ALD1704/ALD1704G
-4.8
-4.8
Advanced Linear Devices
-4.8
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 ALD1704 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
OPEN LOOP VOLTAGE GAIN AS A FUNCTION
OF SUPPLY VOLTAGE AND TEMPERATURE
COMMON MODE INPUT VOLTAGE RANGE
AS A FUNCTION OF SUPPLY VOLTAGE
±7
1000
} -55°C
±6
OPEN LOOP VOLTAGE
GAIN (V/mV)
COMMON MODE INPUT
VOLTAGE RANGE (V)
TA = 25°C
±5
±4
±3
±2
} +125°C
10
RL= 10KΩ
RL= 5KΩ
1
±3
±2
±4
±5
±6
±7
±2
0
±4
±8
±6
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
INPUT BIAS CURRENT AS A FUNCTION
OF AMBIENT TEMPERATURE
SUPPLY CURRENT AS A FUNCTION
OF SUPPLY VOLTAGE
5
10000
VS = ±5.0V
1000
SUPPLY CURRENT (mA)
INPUT BIAS CURRENT (pA)
} +25°C
100
100
10
1.0
INPUTS GROUNDED
OUTPUT UNLOADED
4
3
TA = -55°C
2
-25°C
+25°C
1
+80°C
+125°C
0
0.1
-50
-25
0
25
50
75
100
0
125
AMBIENT TEMPERATURE (°C)
ALD1704A/ALD1704B
ALD1704/ALD1704G
±1
±2
±3
±4
±5
±6
SUPPLY VOLTAGE (V)
Advanced Linear Devices
4
TYPICAL PERFORMANCE CHARACTERISTICS
120
±25°C ≤ TA ≤ 125°C
100
OPEN LOOP VOLTAGE
GAIN (dB)
±6
RL = 10KΩ
RL = 10KΩ
±5
±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
10K
100K
1M
10M
SUPPLY VOLTAGE (V)
FREQUENCY (Hz)
INPUT OFFSET VOLTAGE AS A FUNCTION
OF AMBIENT TEMPERATURE
REPRESENTATIVE UNITS
INPUT OFFSET VOLTAGE AS A FUNCTION
OF COMMON MODE INPUT VOLTAGE
INPUT OFFSET VOLTAGE (mV)
15
+5
+4
VS = ±5.0V
+3
+2
+1
0
-1
-2
-3
-4
VS = ±5.0V
TA = 25°C
10
5
0
-5
-10
-15
-5
-50
-25
0
+25
+50
+75
-4
+100 +125
-2
+2
+4
+6
LARGE - SIGNAL TRANSIENT
RESPONSE
OPEN LOOP VOLTAGE GAIN AS A FUNCTION
OF LOAD RESISTANCE
1000
5V/div
100
0
COMMON MODE INPUT VOLTAGE (V)
AMBIENT TEMPERATURE (°C)
OPEN LOOP VOLTAGE
GAIN (V/mV)
1K
PHASE SHIFT IN DEGREES
OUTPUT VOLTAGE SWING (V)
±7
INPUT OFFSET VOLTAGE (mV)
OPEN LOOP VOLTAGE AS A
FUNCTION OF FREQUENCY
OUTPUT VOLTAGE SWING AS A
FUNCTION OF SUPPLY VOLTAGE
VS = ±5.0V
TA = 25°C
RL = 1KΩ
CL = 50pF
VS = ±5.0V
TA = 25°C
10
5V/div
2µs/div
1
1K
10K
100K
1000K
LOAD RESISTANCE (Ω)
SMALL - SIGNAL TRANSIENT
RESPONSE
VOLTAGE NOISE DENSITY AS A
FUNCTION OF FREQUENCY
VOLTAGE NOISE DENSITY
(nV/ √ Hz)
150
100mV/div
125
VS = ±5.0V
TA = 25°C
100
VS = ± 5.0V
TA = 25°C
RL = 1.0KΩ
CL = 50pF
75
50
25
50mV/div
1µs/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
RAIL-TO-RAIL VOLTAGE COMPARATOR
+12V
+10V
= 1012Ω
ZIN ~
0.1µF
VIN
CL
+
VIN
VOUT
VOUT
RL ≥ 1.5KΩ
400pF
0 ≤ VIN ≤ 10V
0.1µF
-
+12V
+
50K
10M
PHOTO DETECTOR CURRENT
TO VOLTAGE CONVERTER
LOW OFFSET SUMMING AMPLIFIER
RF = 5M
10K
50K
+5V
0.1µF
INPUT 1
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
-
VOUT
+
C1
R1
VIN
-
.01µF
R = 10K
10K
VOUT
Low Frequency
Breakpoint ƒL =
10K
1
~
~ 1.6K Hz
f=
=
2πRC
High Frequency
Cutoff ƒH =
LOW PASS FILTER (RFI FILTER)
RF
5K
VIN
R1
C1
-5V
1
= 160Hz
2π R1 C1
R1 = 10K C1 = 100nF
R2 = 10K C2 = 500pF
1
= 32KHz
2π R2C2
PRECISION CHARGE INTEGRATOR
100K
1000pF
5K
R1
+5V
10K
-5V
+
C = .01µF
VOUT = I X RF
PHOTODIODE
+9V
-
0.02µF
VOUT
+5V
1MΩ
VIN
-
+
VOUT
+
-5V
1
Cutoff frequency =
= 3.2kHz
π R1C1
Gain = 10 Frequency roll-off 20dB/decade
ALD1704A/ALD1704B
ALD1704/ALD1704G
Advanced Linear Devices
6