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AD546 Datasheet PDF Download - Analog Devices

Номер произв AD546
Описание 1 pA Monolithic Electrometer Operational Amplifier
Производители Analog Devices
логотип Analog Devices логотип 
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AD546 Даташит, Описание, Даташиты
a
FEATURES
DC PERFORMANCE
1 mV max Input Offset Voltage
Low Offset Drift: 20 V/؇C
1 pA max Input Bias Current
Input Bias Current Guaranteed Over Full
Common-Mode Voltage Range
AC PERFORMANCE
3 V/s Slew Rate
1 MHz Unity Gain Bandwidth
Low Input Voltage Noise: 4 V p-p, 0.1 Hz to 10 Hz
Available in a Low Cost, 8-Pin Plastic Mini-DIP
Standard Op Amp Pinout
APPLICATIONS
Electrometer Amplifiers
Photodiode Preamps
pH Electrode Buffers
Log Ratio Amplifiers
1 pA Monolithic Electrometer
Operational Amplifier
AD546*
CONNECTION DIAGRAM
8-Pin Plastic
Mini-DIP Package
PRODUCT DESCRIPTION
The AD546 is a monolithic electrometer combining the virtues
of low (1 pA) input bias current with the cost effectiveness of a
plastic mini-DIP package. Both input offset voltage and input
offset voltage drift are laser trimmed, providing very high perfor-
mance for such a low cost amplifier.
Input bias currents are reduced significantly by using “topgate”
JFET technology. The 1015 common-mode impedance,
resulting from a bootstrapped input stage, insures that input
bias current is essentially independent of common-mode voltage
variations.
The AD546 is suitable for applications requiring both minimal
levels of input bias current and low input offset voltage. Appli-
cations for the AD546 include use as a buffer amplifier for cur-
rent output transducers such as photodiodes and pH probes. It
may also be used as a precision integrator or as a low droop rate
sample and hold amplifier. The AD546 is pin compatible with
standard op amps; its plastic mini-DIP package is ideal for use
with automatic insertion equipment.
The AD546 is available in two performance grades, all rated
over the 0°C to +70°C commercial temperature range, and
packaged in an 8-pin plastic mini-DIP.
PRODUCT HIGHLIGHTS
1. The input bias current of the AD546 is specified, 100%
tested and guaranteed with the device in the fully warmed-up
condition.
2. The input offset voltage of the AD546 is laser trimmed to
less than 1 mV (AD546K).
3. The AD546 is packaged in a standard, low cost, 8-pin
mini-DIP.
4. A low quiescent supply current of 700 µA minimizes any
thermal effects which might degrade input bias current and
input offset voltage specifications.
*Covered by Patent No. 4,639,683.
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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AD546 Даташит, Описание, Даташиты
AD546–SPECIFICATIONS (@ +25؇C and ؎15 V dc, unless otherwise noted)
Model
INPUT BIAS CURRENT1
Either Input
Either Input
Either Input
@ TMAX
Either Input
Offset Current
Offset Current
@ TMAX
INPUT OFFSET
Initial Offset
Offset @ TMAX
vs. Temperature
vs. Supply
vs. Supply
Long-Term Stability
Conditions
VCM = 0 V
VCM = ± 10 V
VCM = 0 V
VCM = ± 10 V
VCM = 0 V
VCM = 0 V
TMIN–TMAX
AD546J
AD546K
Min Typ Max Min Typ Max
0.2 1
0.1 1
40
40
0.17
13
0.2 0.5
0.2 0.5
20
20
0.09
7
2
3
20
100
100
20
1
2
20
100
100
20
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
4
90
60
35
35
INPUT CURRENT NOISE
f = 0.1 Hz to 10 Hz
f = 1 kHz
1.3
0.4
1.3
0.4
INPUT IMPEDANCE
Differential
Common Mode
OPEN LOOP GAIN
TMIN–TMAX
TMIN–TMAX
INPUT VOLTAGE RANGE
Differential3
Common-Mode Voltage
Common-Mode Rejection Ratio
OUTPUT CHARACTERISTICS
Voltage
Current
Load Capacitance Stability
VDIFF = ± 1 V
VCM = ± 10 V
VO = ± 10 V
RLOAD = 10 k
VO = ± 10 V
RLOAD = 10 k
VO = ± 10 V
RLOAD = 2 k
VO = ± 10 V
RLOAD = 2 k
VCM = ± 10 V
TMIN to TMAX
RLOAD = 10 k
RLOAD = 2 k
Short Circuit
Gain = +1
1013ʈ1
1015ʈ0.8
300 1000
300 800
100 250
80 200
300
300
100
80
± 20
–10 +10 –10
80 90
84
76 80
76
–12 +12 –12
–10 +10 –10
15 20 35 15
4000
1013ʈ1
1015ʈ0.8
1000
800
250
200
± 20
+10
100
80
20
4000
+12
+10
35
Units
pA
pA
pA
pA
pA
pA
pA
mV
µV/°C
µV/V
µV/V
µV/Month
µV p-p
nV/Hz
nV/Hz
nV/Hz
nV/Hz
fA rms
fA/Hz
ʈpF
ʈpF
V/mV
V/mV
V/mV
V/mV
V
V
dB
dB
V
V
mA
pF
–2– REV. A
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AD546 Даташит, Описание, Даташиты
AD546
Model
Conditions
AD546J
AD546K
Min Typ Max Min Typ Max Units
FREQUENCY RESPONSE
Gain BW, Small Signal
Full Power Response
Slew Rate, Unity Gain
Settling Time
Overload Recovery
G = –1
VO = 20 V p-p
G = –1
to 0.1%
to 0.01%
50% Overdrive
Gain = –1
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
POWER SUPPLY
Rated Performance
Operating Range
Quiescent Current
Transistor Count
# of Transistors
± 15
؎5 ؎18 ؎5
0.60 0.7
50
± 15 V
؎18 V
0.60 0.7 mA
50
PACKAGE OPTIONS
Plastic Mini-DIP (N-8)
AD546JN
AD546KN
NOTES
1Bias current specifications are guaranteed maximum, at either input, 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 inputs, such that neither exceeds ± 10 V from ground.
Specifications subject to change without notice.
Specifications in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min and
max specifications are guaranteed, although only those shown in boldface are tested on all production units.
ABSOLUTE MAXIMUM RATINGS1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 18 V
Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . . 500 mW
Input Voltage2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 18 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . . Indefinite
Differential Input Voltage . . . . . . . . . . . . . . . . . . +VS and –VS
Storage Temperature Range . . . . . . . . . . . . . –65°C to +125°C
Operating Temperature Range . . . . . . . . . . . . . . 0°C to +70°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.
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 AD546 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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