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GENERAL DESCRIPTION
The model AD2010 represents an advance in price/performance
capabilities of 3 digit digital panel meters. The AD2010 offers 0.05%
1 digit maximum error with bipolar, single ended input, resolution of
100
V, and a common mode rejection ratio of 60dB (CMRR) at
200mV (CMV).
The AD2010 features a light-emitting-diode (LED) display with a full
scale range of 0 to 199.9 millivolts, latched digital data outputs and
control interface signals, and leading zero display blanking. Automatic-
zero correction circuitry measures and compensates for offset and
offset drift errors, thereby providing virtually no error. Another useful
feature of the AD2010 is its 5V dc operation. The AD2010 can operate
from the user's 5V dc system supply, thereby eliminating the shielding
and decoupling 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 normally 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 indefinite hold time. The AD2010
can also be connected for automatic conversion at its maximum
conversion rate. During conversion, the previous reading is held by the
latched logic. The numeric readout is available as BCD data.
Application of the metering system in a computer or data logging
system is made easy with the availability of the "overrange," "polarity,"
"overload," and "status" signals.
The AD2010/R option for ratiometric operation allows readings to be
made of the ratio of two input voltages as well as the absolute value of
the input. AD2010/R operation is described in a later section.
FEATURES
LED Display with Latched Digital Outputs
Small Size, Lightweight
Automatic Zero Correction; Max Error: 0.05% 1 Digit
High Normal Mode Rejection: 40dB @ 50 or 60Hz
Optional Ratiometric Operation
Leading "0" Display Blanking
5V dc Powered
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Figure 1. Simplified Block Diagram
APPLICATIONS
Medical/Scientific/Analytic Instruments Data
Acquisition Systems
Industrial Weighing Systems
Readouts in Engineering Units
Digital Thermometers
A simplified block diagram of the AD2010, illustrating the features
described above is shown in Figure 1.
IMPROVED NOISE IMMUNITY, ACCURACY AND
ZERO STABILITY
Dual-slope integration, as used in the AD2010 and as described in the
theory of operation section, offers several design benefits.
Conversion accuracy, for example, is independent of both the
timing capacitor value and the clock frequency, since 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.
Low Cost 3 Digit
DPM for OEM Applications
AD2010
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