AD2021 View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'AD2021' PDF : 2 Pages View PDF
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ANALOGDEVICES fAX-ON-DEMAND HOTLINE - Page 35
AD2021-SPECIFICATIONS (typicaal t +25°Candnominaplowersupplyvoltage)
design, and since several other manufacturers now use the same
pand cutout for logic powered DPMs, this industry standard-
ization allows mechanical second sourcing. In addition, the
AD2021 uses the same pin connections as the AD2010 (except
in BCD outputs, of course:) as a convenience to allow updating
designs to take advantage of the second generation design and
"Hold" input is removed, one to two conversions are
needed before the reading is valid.
. Decimal Points: Grounding or Logic "0" will illuminate
the desired decimal point. External drive circuitry must
sink 3SmA peak at a 25% duty cycle when the decimal
points are illuminated.
larger display of the AD2021. Each AD2021 receives a full
DATA OUTPUTS (See Application Section for details on
one week failure free bum-in before shipment.
data outputs)
DISPLAY OUTPUT
. BCD Data Outputs: (CMOS, LP TTL or LP Schottky
compatible), bit parallel, character serial format.
. Light emitting diode, planar seven segment display read-
. Digit Strobe Outputs: (CMOS, DTL, TTL compatible,
outs, 0.5" (l3mm) high for three data digits, 100% over-
one TTL load). Logic "1" on any of these lines indicates
range and negative: polarity indication. Overload indicated
the output data is valid for that digit.
by flashing display, polarity remains valid.
. Polarity Output: (CMOS, TTL, DTL compatible, one
. Decimal points selectable: at input connector.
. Display blanking on three data digits (does not affect
overrange digit, polarity sign of decimal points).
ANALOG INPUT
. Configuration: bipolar, limited differential
. Full Scale Range: :t1.999V or :t199.9mV ("S" option)
O:t19.99V ("V" option)
. AutomatiPcolarity
B . AutoZero
S- . Input Impedance:100MQ(lMQ "V" option)
. BiasCurrent: SOFA
O . OvervoltageProtection: ;l:SOVdc, sustained
ACCURACY
L . ;1:0.05%reading ;1:0.025%full scale :tl digitI
E . Resolution: ImV,10mV ("V" option) or 100pV
. T ("S" option)
E . Temperature Rangez: 0 to +SO°C operating; -25°C to
TTL load). Logic "I" indicates positive polarity input,
logic "0" indicates negative polarity.
. Status: (CMOS or LP TTL compatible). When this signal
is at Logic" 1", the output data is valid.
. Clock: (CMOS, DTL, TTL compatible, one TTL load).
The clock signal is brought out to facilitate conversion
from character serial to parallel data.
. INTERFACING DATA OUTPUTS. The: BCD data outputS
are in a bit parallel, character serial format. There are four'
BCD bit outputs (1,2,4,8) and four digit outputs (10°,101,
102, 103). The BCD digits are gated onto the output lines
sequentially, and the BCD bits are valid fOTthe digit whose
digit line is high. The data is valid except when being updated
which occurs within 2 milliseconds after the statUs line
goes low.
REFERENCEOUTPUT
A 6.4V :t5% analog reference output is made available.
+85°C storage
This reference should be buffered and filtered if use in
. Temperature Coefficient: Gain: SOppm/oC
Zero: auto zero
external circuitry is desired.
POWER INPUT
. Warm-Up Time to Rated Accuracy: less than one minute
. Settling Time to Rated Accuracy: 0.4 second
.NORMAL MODE REJECTION
40dB at 50-60Hz
COMMON MODE REJECTION
. AD2021: 35dB (dc -10kHz)
. AD2021/S: SOdS (dc -10kHz)
. AD2021/V: lSdB (de -10kHz)
COMMON MODE VOLT AGE
. :!:20OmV
. +5V dc ;1:5%,1.45 watts
CALIBRATION ADJUSTMENTS (See Application Section for
calibration instructions)
. Gain
. Zero
. Recommended recalibration interval: six months
SIZE
. 3"W x 1.8"H x 1.33"D (76 x 46 x 34mm)
. 1.90" (48mm) overall depth to rear of card edge connector.
. Panel cutout required: 3.17'5" x uno" (80.65 x 45.97mm).
.CONVERSION RATE
5 conversions per second
. Hold and read on command
CONTROL INPUTS
. Display Blankin2: (TTL, DTL compatible, 2 TTL loads).
WEIGHT
. 4 ounces, (115 grams)
OPTIONS - ORDERING GUIDE
. Input Voltage Range: AD2021 - 1.999V dc Full S.cale
AD2021/S - 199.9mV dc Full Scale
Logic "0" or grounding blanks the three data digits only,
AD2021/V - 19.99V dc Full Scale
not the decimal points, overrange digit (if on) and polar-
ity sign. Logic "I" or open circuit for normal operation.
Display blanking has no effect on output data and the
display reading is valid immediately upon removal of a
blanking signal.
. Hold: (CMOS, DTL, TTL compatible, lLP TTL load).
Logic "0" or grounding causes the DPM to cease conver-
sions and display the data from the last conversion. Logic
"I" or open circuit for normal operation. After the
.CONNECTOR
30 pin, 0.156" spacing card edge connector.
2VKlSD/1-2 or equivalent.
. Optional:Order AClSOl
NOTES
JGuaranteed at 25°C and nominal supply voltage
~Guaranteed
Viking
Specifications subj~t to change without notice.
-2-
REV. A
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