(
-..
ANALOG
W
DEVICES
FEATURES
"Second Generation" MOS.LSI Design
Large 0.43" (11mm) LED Displays
4% Digit Resolution
-
20,000 Counts Full Scale
Limited Differential Input
Either Line Powered (AD2024) or Logic Powered (AD2027)
Industry Standard Case Designs
LowCost
4
Y2
Digit
DPMsWithLEDDisplays
AD2024/AD2027
,
OBS
APPLICATIONS
High Resolution/High Accuracy R_out for:
Test Equipment
Process Control Instrumentation
Analytical and Scientific Instruments
GENERAL DESCRIPTION
The AD2024 and AD2027 are low cost 41,1digit DPMs with
large LED displays. Both units offer the same features and iden-
tical performance, but the AD2024 is ac line powered and the
AD2027 is +5V dc powered.
THE BENEFITS OF SECOND GENERATION DESIGN
The AD2024 and AD2027 are designed around.MOS-LSI
(Metal Oxide Semiconductor, Large Scale Integration) inte-
grated circuits which greatly reduce the number of components
and interconnections required to provide the p'erformance and
features expected in a high resolution 41,1digit DPM.
OLE
TE
External power supply outputs at +5V and -25V (-25V only
on the AD2027) are made available for powering external cir-
cuitry. In addition, control inputs for conversion "Hold",
display blanking and decimal point selection are provided.
This "Second Generation" design, therefore, offers greatly
increased reliability and significantly lower cost at little com-
promise in performance. The large 0.43 inch (11mm) LED dis-
plays offer the brightness and readability previously available
only with gas discharge displays with the added advantage of
an all solid state component.
HIGH RESOLUTION AND VERSATILE FEATURES
These DPMs measure dc input voltages over a full scale range
of :t1.9999V with an accuracy of :to.005% teading j:().OO5%of
full scale :t 1 digit. Using the "limited differential" input first
used by Analog Devices on the AD2010, the AD2024 and
AD2027 prevent ground loop problems and provide 50dB of
common mode rejection at common mode voltages up to
:t200mV. Normal mode rejection is 25dB at 50-60Hz.
BCD data outputs are provided in a bit parallel, character serial
format compatible with CMOS logic systems. When applica-
tions require parallel BCD data, such as interfaces to printers,
compara~ors or slave displays, parallel BCD output options are
available that are compatible to standard TTL logic systems.
INDUSTRY STANDARD CASE DESIGNS
Although both the AD2024 and AD2027 have identical elec-
trical designs, they are packaged in the case sizes that have
become industry standards for ac line powered and +5V dc
logic powered DPMs respectively. The AD2024 fits the 3.924"
x 1.682" (99.67 x 42.74mm) panel cutout common to most
ac line powered DPMs, and the AD2027 fits the 3.175" x
1.810" (80.65 x 45.97mm) panel cutout of the Analog Devices
logic power case design, now used by several other manufac-
turers of logic powered DPMs. Thus, interchangeability is
assured, allowing mechanical second sourcing for both these
DPMs.
DESIGNED AND BUILT FOR RELIABIUTY
Even beyond the reliability advantages of the LSI-IC design
and LED displays, the AD2024 and AD2027 have had extreme
care taken in their design and manufacture to insure reliability.
Manufacturing processes are monitored by continual quality
assurance inspections to insure proper workmanship and test-
ing. Automatic test equipment is used to test each DPM thor-
oughly and without error. And each AD2024 and AD2027,
like every Analog Devices DPM, receives a full one week failure-
free burn-in before shipment.
.
For detailed inform.don,
contact factory.
DIGITAL PANEL INSTRUMENTS
VOL.
II,
'~25
SPECIFICATIONS
DISPLAYOUTPUTS
. Seven Segment LED Display, 0.43" (llmm) high, for
four data digits, 100%overrange and polarity indication.
. Overload indication by blanking all digits, polarity sign
remains valid.
. Decimal points (4) selectable at input.
. Display Blanking
ANALOG INPUT
. Confaguration: Bipolar, limited differential
. Full Scale Range: :1:1.9999V(:1:19.999V,"V" Option)
. Automatic Polarity
. Input Impedance: l00MO (lMO, "V" Option)
. Bias Current:. 3OnA (3nA, '~V" Option)
EXTERNAL POWER SUPPLY OUTPUTS
AD2024: +5V at 25mA, -25V at 5mA
.
. AD2027:-25Vat 5mA
POWER SUPPLY INPUTS
AD2024: ac line, 50-60Hz, 4.2W
.
. AD2027: +5V dc, :1:5% 85OmA
at
CALIBRATION ADJUSTMENTS
. Gain
. Zero
. Recommended recalibration interval: 6 months
SIZE
. AD2024: 3.92"Wx 1.67"H x 4,48"D (100 x 42 x 114mm)
"Panel cutout: 3.930" x 1.682" (99.8 x 42.7mm)
. AD2027: 3"Wx 1.8"H x 4"D (76 x 46 x 102mm)
Panel cutout: 3.175" x 1.810" (80.65 x 45.97mm)
WEIGHT
AD2024: 14 ounces (395 grams)
. AD2027: 10 ounces (280 grams)
OPTIONS - ORDERING GUIDE
. Overvoltaje
Protection:
20V
1
. Resolution:
1oollV
,
rms sustained
ACCURACY
.
. to,ooS% reading :1:0.ooS% scale :1:1
futl
digit I
OBS
.
2SdB at SO-60Hz
COMMON MODE REJECTION
.
SOdB, de to 1kHz, :1:200mV common
CONVERSION RATE
. S conversions per second
DIGITAL INTERFACE SIGNALS
. Temperature Range2: 0 to +SOOC
operating. -20 to +8SoC
storage. (AD2024/B: () to +4SoCoperatilJ)
. Tem~rure Coefficient: Gain: :l:30ppm/ C. Zero Offset:
:l:1o,.tvfc (:l:4OppmfC & :!:lOO$lVfC,"V.. Option)
'. Warmup Time: One minute to rated accuracy
. Sctding Time to Rated Accuracy: 4SOms
NORMALMODE REJECTION
.
.
AD2024
'
AC Power Inputs
AD2024
117V ac
AD2024/E
220V ac
mode voltage
puts and control signals are not used)
-
llOdB at 120V
rms common mode voltage, 1kO imbalance at input.
CONVERSIONTIME
. 18Omsfor full scale reading
. 2l0ms for overload conversion
. AD2024(floatedon powersupplytransformerif data out-
. Inputs
Display Blank
-
OLE
TE
-
AD2024/F
-
-
AD2024/H
-
-
100V ac
:tl0%
240V ac
}
Input Ran~e Options
AD2024
- :!:1.9999VFull Scale
AD2024/V
:t19.999V Full Scale
Data Output Options (available with any power input options)
AD2024
Character serial data outputs
-
AD2024/B
-
Parallel BCDoption
(DTLITTL
Compatible,
4 TTL Loads).
Logic "0" or grounding blanks display, including polarity
sign, but not decimal points. The display is valid immed-
iately upon removal of the blanking signal.
Hold - (DTLlTTL Compatible, 2 TIL Loads). Logic "0"
or grounding causes the DPM to hold and display the last
conversion. Upon removal of the hold, the DPM resumes
conversions.
Decimal Points - (Not TTL Compatible). Logic "0" or
grounding tUrns on appropriate decimal point. External
circuitry must sink 6OmA when a decimal point is
illuminated.
. AD2027
Displav Lens Options4
Lens 7 Red with ADI logo
Lens 8 Red without ADilogo
Connector - 36 pin, 0.156" spacing, card edge connector,
Viking 2VK18D/1-2 or equivalent. - Optional: Order
AC2610.
AD2024/B option also requires a 30 pin, 0.156" spacing,
card edge connector, Viking 2VK15D/1-2 or equivalent.
- Optional: Order AC1501.
-
-
Input Ran~e Options
AD2027 - :!:1.9999V Full Scale
AD2027/V - :!:19.999V Full Scale
Data Output OPtions
AD2027 - Character serial data outputs
AD2027/B - Parallel BCD option
Display Lens Options4
Lens 5 - Red with AD! logo
Lens 6 - Red without ADilogo
Connector - AC1501 (see above) or equivalent. AD2027/B
. Outputs
DTLlTIL Compatible3 - Status. Logic "I" indicates con-
version in process. All digital outputs are valid when status
is at logic "0". 5 TTL loads. - Polarity. Logic "I" indi-
cates positive polarity, latched. 5 TIL loads.
CMOS and LP Schottky
Compatible
-
option r.equirestwo
each.
NOTES
1
Guaranteed at
+2SoCand
nominal power supply voltage.
2Guaranteed.
. For CMOS compatibility, 3.3k puUup resistors to the +SV output of
the DPM are required.
. If no lens is specified, Lens
5
or 7 is supplied as appropriate.
Specifications subject to change without notice.
Overload,
Logic
"I" indicates overload (~20,OOO), latched. - BCD
outputs. 4\O(ZCD digits, character serial, bit parallel,
B
1 LP Schottky Load.
Diiital Strobe Outputs
(CMOS or LP Schottky
Compatible) Logic "I" on any of these line indicates
the output data is valid for that digit, 1 LP Schottky
Load.
-
Parallel BCD Output (Option "B"). - 4\O(Z
BCD digits,
positive true, latched. Drives 5 TIL loads. - Data Ready.
Logic "I" indicates output data is valid. Drives 2 TIL
loads.
VOL II,
76-26
DIGITALPANEL INSTRUMENTS
j
Applying AD2024andAD2027
the
ANALOG HIGH
A
PIN
1
2
-KEY
3
AD202.
FUNCTION
An8Io1I round
G
10' Digit
BCD 2
10J Digit
BCDS
Mux Step 1
+5V de (Oud
NC
8CHigh
NC
8CRETURN
NC
Digit81 Ground
PIN
A
8
-KEY
C
D
E
F
H
J
K
L
M
N
P
R
S
T
U
V
FUNCTION
AnaloaHiah
1oe Digit (LSD!
V'N,
ANALOG GROUNO
DIGITAL GROUND
AC HIGH
Ie
LINEC""
Ie R8",m
..
5
S
7
S
9
10
11
12
13
Figure
1.
AD2024 Wiring Interconnections
ANALOG HIGH
10' Digit
BCD"
BCD 1
10" Digit (MSD)
-25V de (Out)
NC
8CHigh
NC
8CR81um
NC
Digit81 Ground
V,N
ANALOG GROUND
OBS
DIGITAL GROUND
POWER GROUND
A
1000
J
,..
15
16
17
1S
NC
PoIIIrity
D..,
BI8nk
DP1XXX.X
<>-toed
+6V de
POWER
SUPPLY
8
AD2027
Status
Hold
DP1.XXXX
DP1X.XXX
DP1XX.XX
+6V de POWER INPUT
9.K
Figure
2.
AD2027 Wiring Interconnections
Interfacinll Data Outputs
The standard data outputs are in a bit parallel character serial
format compatible to CMOS and LP Schottky logic systems.
The BCD outputs are multiplexed, and a digit output is pro-
vided for each of the five digits of output. Thus, the four
BCD lines on the output at a:given time are valid for the
digit whose digit line is currently high. The bit parallel
character serial data is valid when the DPM statUs line is low
for a period of SOms between each conversion cycle. The
overload line is latched ou tpu t which is at logic" 1", when-
ever the input exceeds the full 20,000 count range.
Optional parallel BCD outputs ("B" option) are available on a
separate card which is internally connected to the DPM. The
output data then is presented in a full parallel format and is
latched. The parallel data is valid whenever the data ready
output is high.
Pin connections for the "B" option are shown in the intercon-
nection tables and a full timing diagram is shown in Figure 3.
INTEGRATION
CYCLE
I
I
I
I
I
OLE
TE
PIN
t
2
3
FUNCTION
PIN
A
B
C
D
E
F
H
J
K
L
FUNCTION
AD2024
-
Signal and Pin Connections
..
An8IogHIgh
1oe Digit (LSD)
BCDS
BCD 2
An8Io1I round
G
Mux S18p1
BCD 1
BCD"
10' Digit
103 Digit
-25VDC (Out)
DigitIIlGround
-I5V (In)
NC
5
S
7
S
9
10
10" Digit (MSD)
103 DIgit
NC
Poww Ground
-I5V (In)
NC
-KEY
11
12
13
-KEY
M
N
P
Display 8I8nk
Hold
o-Ioad
DP1.XXXX
NC
PoI_ity
S-
,..
15
R
S
DP1XX.XX
DPtX.XXX
DP1XXX.X
NOTE 1: BCD multiplexer dock pulse ...8IIalll8for remote
pI_ment of BCD option.
AD2027
-
Signal and Pin Connections
PIN
FUNCTION
A
NC (Do Not Usel
B
BCDS (In)
-
KEY
C
BCD2 (In)
D
BCD"
BCDBO
E
F
BCD8000
H
BCD 1000
J
BCD200
K
BCD2
BCD 10
L
M
BCD4000
N
10" Digit (In)
P
Status (In)
R
MuxStep (lnl
S
Digital Ground
~ SIGNAL
:.
REFERENCE
INTEGRATE
(100mt AXI
M
.:.
RECOVER.
.'
lOlL
I
STATUS
~
INTEGRATE
,t6Oms1
I
I
I
I
I
I
I
IDLE
TIME:
(150"",
MINI
I
r
I
DATA VALID
,
DIGIT.sERIAL~
PARALLEL.DATA
READY FLAG
(NOTE 2)
I
I
:
~//A
I
tl
:
:
--;!-NOTE1
FUNCTION
PIN
1
+5V de (In)
2
BCD 1 (In)
1-- KEY
3
BCD.. (In)
..
BCD2000
BCD40
5
BCD800
6
7
BCD 100
S
BCD 10,000
9
BCD20
10 'BCDS
11
BCDt
12
BCD400
13
08t8 R88dy
II
II
,..
15
Pol8rity (In)
PoI8rity (Out)
PARA~i~~DDATA
Wo'?$///////////////////////
NOTE 1. APPROX. Sm, REQUIRED
NOTE 2. B OPTION.
TO LOAD PARALLEL-OUT
/
~//////////
REGISTERs.
NOTES: 11o-Ioed output is on m8in DPMconnector.
21Pins mft8d "In" - m8d8 IY8il8blefor --
p'-'nent of BCDoption ~ end - not
norm8lly IIIICIsince all conMCtiOl1l-
in_I.
Figure
3.
AD2024/AD2027 Timing Diagram
AD2024/AD2027
BCD Options
-
Signal and Pin Connections
DIGITAL PANEL INSTRUMENTS
VOL. II,
76-27
~--
SJ:)IA30"
001YNY"
."...n ....
-
MOUNTING
BLOCK
00000
00000
00000
NOI.WO SUONIO
1>.10
1130)
.
0
0
0
0
M
aM 08-01
2M08-01
aM08-01
aM08.01
.1JWNI
::»y,\OtPZ
::»y,\OOL
::»y,\OZZ
::»y,\ LLL
A 1cIcins
"
I
4.4,
11141
IIIJN\OcI
IIOIIV
0000000
D.2. (8.731
A
KEY BETWEEN
PIN2813
V
P1, 38 PIN CONNECTOR
PANEL CUTOUT: 3.930 X 1.682 (99.82 X 42.72)
OBS
, LENS
~
4.2161107.1)
-CT
INPUT OFFSET AOJUST
..,...n
1t8lay..
53:>11\30
DO1VNV"
4.-
(1041
MAX
PI
OLE
TE
KEY BETWEEN
PIN 2813
Figure
4.
AtJ2024 Mechanical Outline
(Dimensions shown in inches and (mm))
NOI.LclO
SUONIO .
Y.1YO
0:>8 0
iiOiido
8
L~D~UV
P1, 30 PIN
CONNECTOR
PANEL CUTOUT: 3.175 X 1.180 (80.65 X 45.97)
SNAP-ON
LENS
2.022
(61.4)
MAX
r
l
r
4.830 1117.8) MAX
Figure
5.
AD2027 Mechanical Outline
.
(Dimensions shown in inches and (mm))
VOL. 1/,
76-28
DIGITAL PANEL INSTRUMENTS
--
..j
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