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Analog Devices Semiconductor Electronic Components Datasheet

AD546 Datasheet

1 pA Monolithic Electrometer Operational Amplifier

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AD546 pdf
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


Analog Devices Semiconductor Electronic Components Datasheet

AD546 Datasheet

1 pA Monolithic Electrometer Operational Amplifier

No Preview Available !

AD546 pdf
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


Part Number AD546
Description 1 pA Monolithic Electrometer Operational Amplifier
Maker Analog Devices
Total Page 12 Pages
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