AD2015_15 Datasheet, PDF (1/2 Pages) Analog Devices – LOW COST 3 1/2 DIGIT DPM FOR OEM APPLICATIONS

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Page 32
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W DEVICES
LowCost,3 1/2Digit
DPMfor OEMApplications
AD2010 I
FEATURES
LED Display with Latched Digital Outputs
Small Size, Ughtweight
Automatic Zero Correction; Max Error: 0.05% :t:1 Digit
High Normal Mode ReJection: 4OdB @ 50 or 60Hz
Optional Ratlometric Operation
leading "0" Display Blanking
5VDC Powered
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APPLICATIONS
MedicaJ/ScientificlAnalytic Instruments
Data Acquisition Systems
Industrial Weighing Systems
Radouts in Engineering Units
Digi18l Thennometen
O_{GENERAL DESCRIPTION}
B _{Analog Devices' model AD2010 represents an advance in price!}
performance capabilities of 3~ digit digital panel meters. The
S _{AD20l0 offers O.OS%~l digit maximum error with bipolar,}
O ^{/888 single ended input, resolution of lO°StV, .and a common mode}
rejection ratio of 60dB (CMRR) at %lOOmV (CMV).
L _{The AD20l0 features a light-cmitting-diode (LED) display}
E with a full scale range of 0 to ~l99.9 miRivolts, latched digital
data outputs and control interface signals, and leading zero dis-
TE _{play blanking. Automatic-zero correction circuitry measures}
ANALOG IN
ANALOG GHD
DIGITAL GND
6Vdo
ANAlOGSECTION
31Ii DIGIT A TO 0
DIGITAL SEA:TlCN
lieD DATA
POu.RITY SIGNAL
OVERl,QAI> SIGNAL
OVERRANaE SIGNAL
and compensates for offset and offset drift errors, thereby
{ ^{STATUS SIGNAl.}
providing virtually no error. Another useful feature of the
AD20l0 is its SV de operation. The AD20l0 can operate from
the users' SV de system supply, thereby eliminating the shield-
Figure 1. Simplified Functional Block Diagram
ing and dc:coupling needed for line powered units when the ac
line must be routed near signal leads.
To satisfy most application requirements, the conversion rate
of the AD2010 is normal1y 4 readings per second. However, an
external trigger may be applied to vary the sampling rates from
a maximum of 24 readings per second down to an indef'mite
hold time. The AD2010 can also be connected for automaric
IMPROVED NOISE IMMUNITY, ACCURACY AND
ZERO STABILITY
Dual-slope integration, as used in the AD2010 and as described
in the tbeory of operation section, offers several design benefits.
. Conversion accuracy, for example, is independent of both
the timing capacitor value and the clock frequency, since
conversion at its maximum conversion rate. During conversion,
the previous reading is held by the latched logic. The numeric
readout is available as BCD da.ta.Applica.tion of the metering
system in a computer or data logging system is made easy with
the availability of the "overrange," "polarity, It...overload,"
and "statUs" signals.
they affect both the up ramp and down ramp integration
in the same ratio.
. Normal mode noise at line frequencies or its harmonics is
rejected since the average value of this noise is zero over the
integration period.
. To achieve Zero stability, a time interval during each conver-
sion is provided to allow the automatic-zero correction cir-
A simplified block diagram of the AD20l0, illustrating the
cuitry to measure and compensate for offset and offset drift
features described above is shown in Figure 1.
errors, thereby, providing virtUally no zero error.
Foe detaikod information, contact &ctmy.
REV. A
Infonnation 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.
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