AD521_15 Datasheet, PDF (1/6 Pages) Analog Devices – INTEGRATED CIRCUIT PRECISION INSTRUMENTATION AMPLIFIER

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,. ANALOG
W DEVICES
IntegratedCircuit
PrecisionInstrumentatioAnmplifier
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FEATURES
Programmable Gains from 0.1 to 1000
Differential Inputs
High CMRR: 11OdBmin
Low Drift: 2p.Vfc max (L)
Complete Input Protection, Power ON and Power OFF
Functionally Complete with the Addition of Two Resistors
Internally Compensated
Gain Bandwidth Product: 4OMHz
Output Current Limited: 25mA
Very LowNoise: 05p.V p-p, 0.1Hzto 10Hz, RTI (I G -1000
Chips are Available
Not Recommended PRODUCTDESCRIPTION
The AD521 is a second generation, low cost, monolithic IC
instrUmentation amplifier developed by Analog Devices.As a
trUe instrUmentation amplifier, the AD521 is a gain block with
differential inputs and an accurately programmable input/
output gain relationship.
The AD521 IC instrUmentation amplifier should not be con-
fused with an operational amplifier, although several manu-
factUrers(including Analog Devices)offer op amps which can
be used as building blocks in variable gain instrumentation
amplifier circuits. Op amps are general-purpose components
which, when used with precision-matched external resistors,
can perform the instrUmentation amplifier function.
An instrumentation amplifier is a precision differential volt-
age gain device optimized for operation in a real world envi-
ronment, and is intended to be used wherever acquisition of a
useful signal is difficult. It is characterized by high input im-
pedance, balanced differential inputs, low bias currents and
high CMR.
As a complete instrUmentation amplifier, the AD521 requires
only two resistors to set its gain to any value between 0.1 and
1000. The ratio matching of these resistors does not affect the
high CMRR (up to 120dB) or the high input impedance (3 X
109il) of the AD521. Furthermore, unlike most operational
amplifier-based instrUmentation amplifiers, the inputs are
protected against overvoltagesup to :1:15volts beyond the
supplies.
The AD521 IC instrumentation amplifier is available in four
different versions of accuracy and operating temperatUre range.
The economical "J" grade, the low drift "K" grade, and the
lower drift, higher linearity "L" grade are specified from 0 to
AD521 I
PIN CONFIGURATION
+ INPUT I 1
GAI~ 12
141 ~AIN
131 ~ALE
OFTFRSEIMT_{I 4}
OFTFRSIEMT_{I 8}
OUTPUT I 7
9 I COMPo
81 v+
a
+70°C.The "S" grade guarantees performance to specification
over the eXtended temperatUre range: -SSoC to +125°C.
for new Designs PRODUCTHIGHLIGHTS
1. The ADS21 is a trUe instrumentation amplifier in integrated
circuit form, offering the user performance comparable to
many modular instrumentation amplifiers at a fraction of
the cost.
2. The AD521 has low guaranteed input offset voltage drift
(21lVf C for L grade) and low noise for precision, high gain
applications.
3. The AD521 is functionally complete with the addition of
two resistors. Gain can be preset from 0.1 to more than
1000.
4. The AD521 is fully protected for input levelsup to 15V
beyond the supply voltages and JOV differential at the
inputs.
5. Internally compensated for all gains, the AD521 also offers
the user the provision for limiting bandwidth.
6. Offset nulling can be achieved with an optional trim pot.
7. The AD521 offers superior dynamic performance with a
gain-bandwidth product of 40MHz, full peak response of
100kHz (independent of gain) and a settling time of 5p.s
to 0.1% of a 10V step.
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