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AD546J-AD546JN-AD546KN
1 pA Monolithic Electrometer Operational Amplifier
CONNECTION DIAGRAM
8-Pin Plastic
Mini-DIP PackageREV.A
1 pA Monolithic Electrometer
Operational Amplifier
FEATURES
DC PERFORMANCE
1 mV max Input Offset Voltage
Low Offset Drift: 20 mV/8C
1 pA max Input Bias Current
Input Bias Current Guaranteed Over Full
Common-Mode Voltage Range
AC PERFORMANCE
3 V/ms Slew Rate
1 MHz Unity Gain Bandwidth
Low Input Voltage Noise: 4 mV 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
PRODUCT DESCRIPTIONThe 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 Ω 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.
*Covered by Patent No. 4,639,683.
PRODUCT HIGHLIGHTSThe input bias current of the AD546 is specified, 100%
tested and guaranteed with the device in the fully warmed-up
condition.The input offset voltage of the AD546 is laser trimmed to
less than 1 mV (AD546K).The AD546 is packaged in a standard, low cost, 8-pin
mini-DIP.A low quiescent supply current of 700 μA minimizes any
thermal effects which might degrade input bias current and
input offset voltage specifications.
AD546–SPECIFICATIONS(@ +258C and 615 V dc, unless otherwise noted)INPUT OFFSET
INPUT VOLTAGE NOISE
INPUT CURRENT NOISE
OPEN LOOP GAIN
INPUT VOLTAGE RANGE
OUTPUT CHARACTERISTICS
AD546PACKAGE OPTIONS
NOTESBias current specifications are guaranteed maximum, at either input, after 5 minutes of operation at TA = +25°C. Bias current increases by a factor of 2.3 for
every 10°C rise in temperature.Input offset voltage specifications are guaranteed after 5 minutes of operation at TA = +25°C.Defined 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 RATINGS1SupplyVoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±18V
InternalPowerDissipation . . . . . . . . . . . . . . . . . . . . . .500 mW
Input Voltage2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±18 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . .Indefinite
DifferentialInputVoltage . . . . . . . . . . . . . . . . . .+VS and –VS
Storage Temperature Range . . . . . . . . . . . . .–65°C to +125°C
Operating Temperature Range . . . . . . . . . . . . . .0°C to +70°C
Lead Temperature Range (Soldering60sec) . . . . . . . .+300°C
NOTESStresses 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.For supply voltages less than ±18 V, the absolute maximum input voltage is equal
to the supply voltage.
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V 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.
AD546–Typical Characteristics (VS = 615 V, unless otherwise noted)
SUPPLY VOLTAGE ± V
INPUT VOLTAGE RANGE 05201015Figure 1.Input Voltage Range
vs. Supply Voltage
SUPPLY VOLTAGE ± V
QUIESCENT CURRENT – µAFigure 4.Quiescent Current vs.
Supply Voltage
OPEN LOOP GAIN – V/mV
TEMPERATURE – oC
300Figure 7.Open Loop Gain vs.
Temperature
SUPPLY VOLTAGE ± V05201015
OUTPUT VOLTAGE RANGE Figure 2.Output Voltage Range
vs. Supply Voltage
INPUT COMMON MODE VOLTAGE – V
COMMON MODE REJECTION RATIO – dB
–15+15–100+10
100Figure 5.CMRR vs. Input
Common-Mode Voltage
WARM-UP TIME – Minutes01723456
|VOS| –µVFigure 8.Change in Offset
Voltage vs. Warm-Up Time
100k10k1k10
LOAD RESISTANCE – Ω
OUTPUT VOLTAGE SWING – Volts p-p
100Figure 3.Output Voltage Swing
vs. Resistive Load
Figure 6.Open Loop Gain vs.
Supply Voltage
COMMON-MODE VOLTAGE – Volts
INPUT BIAS CURRENT – fAFigure 9.Input Bias Current vs.
Common-Mode Voltage
