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AD549 - Analog Devices - Ultralow Input Bias Current Operational Amplifier

Номер произв AD549
Описание Ultralow Input Bias Current Operational Amplifier
Производители Analog Devices
логотип Analog Devices логотип 
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AD549 Даташит, Описание, Даташиты
a
FEATURES
Ultralow Bias Current: 60 fA max (AD549L)
250 fA max (AD549J)
Input Bias Current Guaranteed Over Common-Mode
Voltage Range
Low Offset Voltage: 0.25 mV max (AD549K)
1.00 mV max (AD549J)
Low Offset Drift: 5 V/؇C max (AD549K)
20 V/؇C max (AD549J)
Low Power: 700 A max Supply Current
Low Input Voltage Noise: 4 V p-p 0.1 Hz to 10 Hz
MIL-STD-883B Parts Available
APPLICATIONS
Electrometer Amplifiers
Photodiode Preamp
pH Electrode Buffer
Vacuum lon Gage Measurement
Ultralow Input Bias Current
Operational Amplifier
AD549*
CONNECTION DIAGRAM
GUARD PIN, CONNECTED TO CASE
OFFSET NULL
1
NC
8 V+
AD549 7
INVERTING 2
INPUT
6 OUTPUT
3
NONINVERTING
INPUT
5
4 OFFSET
NULL
V–
10k
1
VOS TRIM
NC = NO CONNECTION
5
4 –15V
PRODUCT DESCRIPTION
The AD549 is a monolithic electrometer operational amplifier
with very low input bias current. Input offset voltage and input
offset voltage drift are laser trimmed for precision performance.
The AD549’s ultralow input current is achieved with “Topgate”
JFET technology, a process development exclusive to Analog
Devices. This technology allows the fabrication of extremely low
input current JFETs compatible with a standard junction-
isolated bipolar process. The 1015 common-mode impedance,
a result of the bootstrapped input stage, insures that the input
current is essentially independent of common-mode voltage.
The AD549 is suited for applications requiring very low input
current and low input offset voltage. It excels as a preamp for a
wide variety of current output transducers such as photodiodes,
photomultiplier tubes, or oxygen sensors. The AD549 can also
be used as a precision integrator or low droop sample and hold.
The AD549 is pin compatible with standard FET and electrom-
eter op amps, allowing designers to upgrade the performance of
present systems at little additional cost.
The AD549 is available in a TO-99 hermetic package. The case
is connected to Pin 8 so that the metal case can be independently
connected to a point at the same potential as the input termi-
nals, minimizing stray leakage to the case.
*Protected by Patent No. 4,639,683.
The AD549 is available in four performance grades. The J, K,
and L versions are rated over the commercial temperature range
0°C to +70°C. The S grade is specified over the military tem-
perature range of –55°C to +125°C and is available processed to
MIL-STD-883B, Rev C. Extended reliability PLUS screening is
also available. Plus screening includes 168-hour burn-in, as
well as other environmental and physical tests derived from
MIL-STD-883B, Rev C.
PRODUCT HIGHLIGHTS
1. The AD549’s input currents are specified, 100% tested and
guaranteed after the device is warmed up. Input current is
guaranteed over the entire common-mode input voltage
range.
2. The AD549’s input offset voltage and drift are laser trimmed
to 0.25 mV and 5 µV/°C (AD549K), 1 mV and 20 µV/°C
(AD549J).
3. A maximum quiescent supply current of 700 µA minimizes
heating effects on input current and offset voltage.
4. AC specifications include 1 MHz unity gain bandwidth and
3 V/µs slew rate. Settling time for a 10 V input step is 5 µs to
0.01%.
5. The AD549 is an improved replacement for the AD515,
OPA104, and 3528.
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
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AD549 Даташит, Описание, Даташиты
AD549–SPECIFICATIONS (@ +25؇C and VS = +15 V dc, unless otherwise noted)
Model
AD549J
Min Typ Max
INPUT BIAS CURRENT1
Either Input, VCM = 0 V
Either Input, VCM = ± 10 V
Either Input at TMAX,
VCM = 0 V
Offset Current
Offset Current at TMAX
INPUT OFFSET VOLTAGE2
Initial Offset
Offset at TMAX
vs. Temperature
vs. Supply
vs. Supply, TMIN to TMAX
Long-Term Offset Stability
150 250
150 250
11
50
2.2
0.5 1.0
1.9
10 20
32 100
32 100
15
INPUT VOLTAGE NOISE
f = 0.1 Hz to 10 Hz
f = 10 Hz
f = 100 Hz
f = 1 kHz
f = 10 kHz
4
90
60
35
35
INPUT CURRENT NOISE
f = 0.1 Hz to 10 Hz
f = 1 kHz
0.7
0.22
INPUT IMPEDANCE
Differential
VDIFF = ± 1
Common Mode
VCM = ± 10
OPEN-LOOP GAIN
VO @ ± 10 V, RL = 10 k
VO @ ± 10 V, RL = 10 k,
TMIN to TMAX
VO = ± 10 V, RL = 2 k
VO = ±10 V, RL = 2 k,
TMIN to TMAX
300
300
100
80
INPUT VOLTAGE RANGE
Differential3
Common-Mode Voltage
Common-Mode Rejection Ratio
V = +10 V, –10 V
TMIN to TMAX
–10
80
76
OUTPUT CHARACTERISTICS
Voltage @ RL = 10 k,
TMIN to TMAX
Voltage @ RL = 2 k,
TMIN to TMAX
Short Circuit Current
TMIN to TMAX
Load Capacitance Stability
G = +1
–12
–10
15
9
1013ʈ1
1015ʈ0.8
1000
800
250
200
± 20
+10
90
80
+12
+10
20 35
4000
AD549K
Min Typ Max
75 100
75 100
4.2
30
1.3
0.15 0.25
0.4
25
10 32
10 32
15
46
90
60
35
35
0.5
0.16
1013ʈ1
1015ʈ0.8
300 1000
300 800
100 250
80 200
± 20
–10 +10
90 100
80 90
–12 +12
–10
15 20
9
+10
35
4000
AD549L
Min Typ Max
40 60
40 60
2.8
20
0.85
0.3 0.5
0.9
5 10
10 32
10 32
15
4
90
60
35
35
0.36
0.11
1013ʈ1
1015ʈ0.8
300 1000
300 800
100 250
80 200
± 20
–10 +10
90 100
80 90
–12 +12
–10
15 20
9
+10
35
4000
AD549S
Min Typ Max Units
75 100 fA
75 100 fA
420 pA
30 fA
125 pA
0.3 0.5 mV
2.0 mV
10 15 µV/°C
10 32 µV/V
32 50 µV/V
15 µV/Month
4 µV p-p
90 nV/Hz
60 nV/Hz
35 nV/Hz
35 nV/Hz
0.5 fA rms
0.16 fA/Hz
1013ʈ1
1015ʈ0.8
ʈpF
ʈpF
300 1000
300 800
100 250
25 150
V/mV
V/mV
V/mV
V/mV
± 20 V
–10 +10 V
90 100
80 90
dB
dB
–12 +12 V
–10
15 20
6
+10 V
35 mA
mA
4000
pF
FREQUENCY RESPONSE
Unity Gain, Small Signal
Full Power Response
Slew Rate
Settling Time, 0.1%
0.01%
Overload Recovery,
50% Overdrive, G = –1
0.7 1.0
50
23
4.5
5
2
0.7 1.0
50
23
4.5
5
2
0.7 1.0
50
23
4.5
5
2
0.7 1.0
50
23
4.5
5
2
MHz
kHz
V/µs
µs
µs
µs
–2– REV. A
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AD549 Даташит, Описание, Даташиты
AD549
Model
AD549J
AD549K
AD549L
AD549S
Min Typ Max Min Typ Max Min Typ Max Min Typ Max
Units
POWER SUPPLY
Rated Performance
Operating
Quiescent Current
± 15 ± 15 ± 15 ± 15
؎5 ؎18 ؎5 ؎18 ؎5 ؎18 ؎5 ؎18
0.60 0.70
0.60 0.70
0.60 0.70
0.60 0.70
V
V
mA
TEMPERATURE RANGE
Operating, Rated Performance 0
Storage
–65
+70 0
+150 –65
+70 0
+150 –65
+70 –55
+150 –65
+125
+150
°C
°C
PACKAGE OPTION
TO-99 (H-08A)
Chips
AD549JH
AD549JChips
AD549KH
AD549LH
AD549SH, AD549SH/883B
NOTES
1Bias current specifications are guaranteed after 5 minutes of operation at T A = +25°C. Bias current increases by a factor of 2.3 for every 10°C rise in temperature.
2Input offset voltage specifications are guaranteed after 5 minutes of operation at T A = +25°C.
3Defined as max continuous voltage between the inputs such that neither input exceeds ± 10 V from ground.
Specifications subject to change without notice.
All min and max specifications are guaranteed. Specifications in boldface are tested on all production units at final electrical test. Results from those tests are used to
calculate outgoing quality levels.
ABSOLUTE MAXIMUM RATINGS1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 18 V
Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . . 500 mW
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 18 V2
Output Short Circuit Duration . . . . . . . . . . . . . . . . . Indefinite
Differential Input Voltage . . . . . . . . . . . . . . . . . . +VS and –VS
Storage Temperature Range (H) . . . . . . . . . . –65°C to +125°C
Operating Temperature Range
AD549J (K, L) . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
AD549S . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300°C
NOTES
1Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the
operational section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
2For supply voltages less than ± 18 V, the absolute maximum input voltage is equal
to the supply voltage.
METALIZATION PHOTOGRAPH
Dimensions shown in inches and (mm).
Contact factory for latest dimensions.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD549 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. A
–3–
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