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AD521 Datasheet

Integrated Circuit Precision Instrumentation Amplifier

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..
,. ANALOG
W DEVICES
IntegratedCircuit
PrecisionInstrumentatioAnmplifier
[
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 RecoPRODUCTDESCRIPTION
mmThe AD521 is a second generation, low cost, monolithic IC
eninstrUmentation amplifier developed by Analog Devices.As a
dedtrUe 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
OFTFRSEIMTI 4
OFTFRSIEMTI 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 DesignsPRODUCTHIGHLIGHTS
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.
01::\/ 1\
-~ ~-- ~_. ~


Analog Devices Semiconductor Electronic Components Datasheet

AD521 Datasheet

Integrated Circuit Precision Instrumentation Amplifier

No Preview Available !

AD521-SPECIFICATIONS = =(typical @ Vs :t15V, RL 2kO and TA= +25°Cunlessotherwisespecified)
~
GAIN
Ra..e (For Spocified Operation, Note I)
Equation
Error from Equation
Nonlin..rity (NatO 2)
I..G<IOOO
Gain Temporaturo C""fficient
OUTPUT CHARACTERISTICS
RatOd Output
Output at Maximum Oporati.. Temporaturo
Impodance
AD521JD
I to 1000
G. Rs/RC V/V
(to.25~.004G)%
0.2% max
t(3 to.05G)f£mtC
UOV, tlOmA min
tlOV @ SmA min
0.10
AD521KD
AD5HW
.0.1% max
AD521SD
(AD5HSDI883B)
t(l5 to.4G)f£mtc
DYNAMIC RESPONSE
Small Signal Bandwidth
G=I
G= 10
G= 100
G = 1000
(13dB)
>2MHz
300kHz
200kHz
40kHz
Small Signal, t1.0% Flatn..s
G=I
75kHz
G= 10
26kHz
G= 100
24kHz
G = 1000
6kHz
Full Peak Response (NatO 3)
100kHz
Skw RatO, I..G ..1000
10V/lis
Settling Time (any 10V stOp to within 10mV of Final Value)
G-I 711'
G= 10
G. 100
G.lOOO
NoDifforcntiaJ Overload Recovery (130V Input to within
t10mV of Final Value) (NatO 4)
RG - 1000
ecCommon Mode StOp Recovery (30V Input to within
o10mV of Final Value) (NatO 5)
m=G 1000
mVOLTAGE OFFSET (may be nulled)
enInput Offset Voltage (Vas,)
dvs. Temporature
e .vs. Supply
d fOutput Offset Voltage (Vaso)
ovs. Temporature
. r .vs. Supply (Narc 6)
neINPUT CURRENTS
wInput Bias Current (either input)
. Devs. Temporature
svs. Supply
igInput Offser Current
nsvs. Temporature
511S
lOlls
35l1s
SOliS
lOllS
3mV max (2mV typ)
1511VtC max (7I1VtC typ)
311V/%
4OOmV max (200mV typ)
4OOIIVtCmax (l50IlV!':C typ)
0.005VOSO/%
80nA max
InAtC max
2 %IV
20nA max
250pAtC max
l.5mV max (0.5mV ryp)
511VtC max (l.5I1Vfc typ)
200mV max (30mV typ)
150llVfc max (50IlV!':C typ)
l.Omv max (0.5mV typ)
2IIV/.C max
lOOmV max
7511VtCmax
4OnA max
500pAfC max
10nA max
125pAtC max
INPUT
Differential Input Impodance (NatO 7)
Common Mode Input Impedance (NatO 8)
Input Voltage Range for Specified Poriorrnance
(with rospect to ground)
3 x 1O911111.8pF
6 x lO'O11113.0pF
tlOV
Maximum Voltage without Damage to Unit, Power ON
or OFF Differential Mode (Note 9)
Voltage at either input (Narc 9)
Common Mode Rejection Ratio, DC to 60Hz with IH1
source unbalance
Gol
GolO
GolOO
G . 1000
NOISE
30V
Vs tl5V
70dB min (74dB typ)
90dB min (94dB typ)
lOOdB min (l04dB typ)
lOOdB min (lIOdB typ)
74dB min (80dB typ)
94dB min (lOOdB typ)
1O4dB min (l14dB typ)
llOdB min (l20dB trP,)
-
Voltage RTO (p-p)@O.IHz to 10Hz (Narc 10)
RMS RTO, 10Hz to 10kHz
Input Current, rms, 10Hz to 10kHz
-
REFERENCE TERMINAL
Bias Current
Input Resistance
Voltage Range
Gain to Output
POWER SUPPLY
Oporati!ll Voltage Ra..e
Quincent Supply Current
311A
IOM11
tlOV
I
t5V to U8V
SmA max
--
TEMPERATURE RANGE
Spooned Performance
Oporating
Storage
0 to +70.C
-25.C to +85.C
-65.C to +150.C
-55.Cto+125.C
---55.C to +125.C
°Specificatiom
ooSpec:if'ocatioaa
AD521JD.
AD5Z1KD.
Specificatioaaoubjoct10 <!wit< without DOO«.
--- -- - --------
REV.A ~


Part Number AD521
Description Integrated Circuit Precision Instrumentation Amplifier
Maker Analog Devices
Total Page 6 Pages
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