AD2026_15 Datasheet, PDF (1/2 Pages) Analog Devices – LOW COST 3 DIGIT LOGIC POWERED DPM

- ^{ANALOGDEVICES fAX-ON-DEHAND HOTLINE}
Page 36
-.. ANALOG
W DEVICES
Low Cost, 3 Digit
Logic Powered DPM
I
AD2026* I
FEATURES
Third Generation 12LLBI Design
Logic Powered (+5 V DC)
Large 0.56'" Red Orange LEOs
Balanced Differentiallnput/Floatlng
1000 V, CMV
Terminal Block Interface (AC Version)
High Reliability: >250,000 Hour MTBF
Small Size and Weight
Low Cost
OBSOLE~: Tf E GENERAL DESCRIPTION
The AD2026 is specifically designed to provide a digital alterna-
tive to analog panel meters. The AD2026 logic powered (+ 5 V
dc). Most of the analog digital circuitry is implemented on a
single I2L LSI chip, the AD2020. Only 13 additional compo-
nents are required to complete the AD2026. The entire assem-
bly is mounted on a single 3" x I 5/8" PCB.
The AD2026 offers as a standard feature, 0.56" high LED
Displays. Brightness is enhanced due to the Red Orange lens. In
addition to the Red Orange lens, the AD2026 is also available
with a dark red lens for applications where maximum brightness
is not required and minimum backlighting is desired.
A unique patented. case design utilizes molded-in fmgers, both
to capture the PCB in the case and to provide snap-in mounting
of the DPM in a standard panel cutout. No mounting hardware
of any kind is used.. The AD2026 occupies less than 1" of space
behind the panel.
For applications where attenuation is required scaling resistors
can be connected betWeen Pins 6 and 7 and between Pins F and
H. Pin 5 must be used as the High Analog InpUt when scaling
resistors are used and Pin 4 when they are not. Pin E is the
Analog Low Input.
14)
11IW
:"",} ~AL
I: .....
~I _EXTER-_~u_~
(FI
SCALING... L-......
RESISTPRS
IE)
1(HI
HI
ICI 111
LO
EXCELLENT PERFORMANCE
.^I.^t.^..^z
The AD2026 offers the instrument designer digital accuracy,
~
Ecc.M... IlOO£
RC<10D1d11
...v
resolution and use of readout while occupying less space than its
analog counterpart. Other features of analog meters such as reli-
Figure 1.
ability and instantaneous response are retained in the AD2026.
The AD2026 measures and displays inputs from -99 mV to
+ 999 mV, with an accuracy of 0.1% of reading ::tI digit. Zero
PIN CONNECTIONS
DC VERSION
shift is less than one bit over the full operating temperature
range, resulting in the same performance as a DPM with auto
zero. The balanced differential input of the AD2026 rejects
common-mode voltages up to 200 mV, enough to eliminate most
ground loop problems.
WIRING CONNECTIONS
For Balanced Differential operation with the AP2026, connect
input as shown in Figure 1. The common-mode loop must pro-
vide a return path for the bias currents internal to the AD2026.
The resistance of this path must be less than 100 kO and total
common-mode voltages must Dot exceed 200 mY.
Pin Function
1 +5 V Power
2 _{+S V Display Power}
3 Decimal Point XXX
4 _{Input (When Scaling)}
Resistors Not Used)
5* _{Input (When Scaling}
Resistors Are Used)
6* _{Series Ann of Scaling}
Resistor Divider
7* _{Series Arm of Scaling}
Resistor Divider
Pin Function
A Decimal Point XX.X
B Decimal Point XXX.
C Power Ground
D Hold
E _{Analog Ground}
F* _{Shunt Arm of Scaling}
Resistor Divider
H* _{Shunt Arm of Scaling}
Resistor Divider
.Covered by Patent NIIIDbcn: 4,091.698. 29.992; 3,872,466; and 3,887,863.
*Not norxmdlyused. Allows convenient mounting of scaling resistors.
REV.A
Information 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 U58. No Iic8nse is granted by implil:ation or
otherwise under any patent or patent rights of Analog Devices.
One Tec:hnology Way. P.O. Box 9106, Norwood, MA 02062-9106. U.S.A.
Tel: [phone]
Fax: [phone]
Twx: 710/394.6577
Telex: 924491
Cable: ANALOG NORWOODMASS