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ANALOG

DEVICES

LowCost4% Digit

DPMsWithLED

Displays

-I

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FEATURES

"Second

Generation" MOS-lSI Design

large 0.43" (11mm) lED Displays

4* Digit Resolution

40,000 Counts Full Scale

limited Differential Input

Either Line Powered (AD2025) or logic Powered (AD2028)

Interchangeable with 4% Digit DPMs (AD2024 or AD2027)

Industry Standard Case Designs

OBS

APPLICATIONS

High Resolution/High Accuracy Readout for:

Test Equipment

Process Control Instrumentation

Analytical and Scientific Instruments

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GENERAL DESCRIPTION

The AD2025 and AD2028 are low cost 4% digit DPMs with

large LED displays. Both units offer the same features and iden-

tical performance, but the AD2025 is ac line powered and the

AD2028 is +5V dc powered.

The AD2025 and AD2028 are interchangeable with two 4\-2

digit DPMs available from Analog Devices, the AD2024 and

AD2027 respectively. Thus, they can be used in applications

where either a 4% or 4\-2digit display may be desirable in one

basic application.

THE BENEFITS OF SECOND GENERATION DESIGN

The AD2025 and AD2028 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 performance and

features expected in a high resolution 4% digit DPM.

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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,

comparators or slave displays, parallel BCD output options are

available that are compatible to standard TTL logic systems.

External power supply outputs at +5V and -25V

on the AD2028) are made available for powering

cuitry. In addition, control inputs for conversion

display blanking and decimal point selection are

(-25V only

external cir-

"Hold",

provided.

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...'

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INDUSTRY

STANDARD

CASE DESIGNS

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 :t3.9999V or :t39.999V with an accuracy of :to.005% reading

:to.005% of full scale :tl digit. Using the "limited differential~,

input first used by Analog Devices on the AD2010, the

AD2025 and AD2028 prevent ground loop problems and pro-

vide 50dB of common mode rejection at common mode vol-

tages up to :t200mV. Normal mode rejection is 25dB at

50-60Hz.

Although both the AD2025 and AD2028 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 AD2025 fits the 3.924"

x 1.682" (99.67 x 42.74mm) panel cutout common to most ac

line powered DPMs, and the AD2028 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 manufacturers

of logic powered DPMs. Thus, interchangeability

is assured,

allowing mechanical second sourcing for both these DPMs.

DESIGNED AND BUILT FOR RELIABILITY

Even beyond the reliability advantages of the LSI-IC design

and LED displays, the AD2025 and AD2028 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 AD2025 and AD2028,

like every Analog DevicesDPM, receivesa full

one week failure-

free burn-in with power cycling before shipment.

Information

furnished

by Analog Devices is believed to be

and reliable. However. no responsibility

is assumed by Analog

for its use; nor for any infringements

of patents or other rights

parties which may result from its use. No license is granted by

tion or otherwise under any patent or patent rights of Analog

accurate

Devices

of third

implica-

Devices.

P.O. Box

280;

Tel: 617/329-4700

Telex: 924491

Norwood,

02062 U.S.A.

Twx: 710/394-6577

Cables: ANALOG

NORWOODMASS

Massachusetts

SPECIFICAIONS

(typical at +25°Candnominalpowersupplyvoltage)

DISPLAYOUTPUTS

. Seven Segment LED Display,

0.43"

(llmm) high, for

four data digits and 300% overrange.

. Overload indication by blanking all digits except over-

range, which indicates "0".

. Decimal points (5) selectable at input.

. Display Blanking

ANALOG

INPUT

. Configuration: Bipolar, limited differential

. Full Scale Range: :!:3.9999V(:!:39.999V,"V" option)

. Automatic Polarity (See applications section for details

on polarity display)

. Input Impedance: 1O0Mn (lMn. "V" oPtion)

. BiasCurrent: 30nA (3nA, "V" option)

. OvervoltageProtection: 120V rms sustained

ACCURACY

. :!:0.005%reading :!:0.005%full scale:!:1digiti

. Resolution: 100llV (lmV, "V" option)

. Temperature Range2:

to +50°C operating. -20 to +85°C

storage. (AD2025/B:

to +45°C operatin8)

. Temperature Coefficient: Gain: :!:30p~m/ C. Zero Offset:

:!:lOllV/C (:!:40ppm/C and :!:IOOllV/ , "V" option)

. WarmupTime: One minute to rated accuracy

. Settling Time to Rated Accuracy: 450ms

NORMAL MODE REJECTION

EXTERNAL POWER SUPPLY OUTPUTS

AD2025: +5V at 25mA, -25V at SmA

. AD2028: -25V at SmA

POWER SUPPLY INPUTS

. AD2025:

line, 50-60Hz, 4W

. AD2028: 5V dc, :!:5%at 800mA

CALIBRATION ADjUSTMENTS

Gain

. Zero

. Recommended recalibration interval: 6 months

SIZE

. AD2025: 3.92"Wx 1.67"H x 4.48"D (l00 x 42 x 114mm)

Panel cutout: 3.930" x 1.682" (99.8 x 42.7mm)

. AD2028: 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

OBS

COMMON MODE REJECTION

AD2025: 14 ounces (395 grams)

GUIDE4

. AD2028: 10 ounces (280 grams)

OPTIONS

- ORDERING

. AD2025

AC Power Inputs - No cost option

AD2025 - 117V ac

AD2025/E - 220V ac

AD2025/F - 100V ac

:!:IO%

AD2025/H - 240V ac

Input Range Options - No cost option

AD2025 - :!:3.9999V Full Scale

AD2025/V - :!:39.999V Full Scale

Data Output Options

AD2025 - Character serial data outputs

AD2025/B - Parallel BCD option

Display Lens Options5

Lens 7 - Red with ADI logo

Lens 8 - Red without ADI logo

Connector - 36 pin, 0.156" spacing, card edge connector,

Viking 2VK18DIl-2 or equivalent. - Optional: Order

AC2610.

AD2025/B option also requires a 30 pin, 0.156" spacing,

card edge connector, Viking 2VKI5D/I-2 or equivalent.

- Optional: Order ACI501.

AD2025 (floated on power supply transformer if data out-

puts and control signals are not used) - II0dB at 120V

rms

common mode voltage, Ikn imbalance at input.

CONVERSION TIME

. 300ms for

full

scale reading

400ms for overload conversion

25dB

at 50-60Hz

50dB, DC to 1kHz, :!:200mV common

mode

voltage

CONVERSION RATE

. 3 conversions per second

DIGITAL INTERFACE SIGNALS

. Inputs

OLE

. AD2028

Input Range OPtions - No cost option

AD2028 - :!:3.9999V Full Scale

AD2028/V

- :!:39.999V Full Scale

Data Output Options

AD2028 - Character serial data outputs

AD2028/B

- Parallel BCD option

Display Lens OPtions5

Lens 5 - Red with ADI logo

Lens 6 - Red without ADI logo

Connector

- ACI501 (see above) or equivalent.

option requires two each.

NOTES

2Guaranteed.

3For CMOS compatibility, 3.3k pullup resistors to the +5V output of

the DPM are required.

4Only one AC Power Input and/or Input Range option may be specified.

The "8" option can be ordered with any combination of power and

range options.

'If no lens is specified, Lens 5 or 7 is supplied as appropriate.

Specifications subject to change without notice.

Guaranteed

Display Blank - (open collector TTL Compatible, 4 TTL

Loads). Logic "0" or grounding blanks display, but not

decimal points. The display is valid immediately upon

removal of the blanking signal.

Hold - (DTL/TTL Compatible, 2 TTL 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 35mA when a decimal point is

illuminated.

. Outputs

DTL/TTL Compatible3

Status.

Logic"

1" indicates

con-

AD2028/B

version in process. All digital outputs are valid when status

is at logic "0". 4 TTL loads. - Polarity. Logic "I" indi-

cates positive polarity, unlatched. 6 TTL loads. - Over-

load, Logic "I" indicates overload (:;>40,000), unlatched

4 TTL Loads.

CMOS and LP Schottky Compatible - BCD outputs, 4%

BCD digits, character serial, bit parallel, I LP Schottky

load.

Parallel BCD Output (Option"B"). - 4% BCD digits,

positive true, latched. Drives 5 TTL loads. - Data Ready.

Logic" I" indicates output data is valid. Drives 2 TTL

loads. - Polarity. Logic "I" indicates positive polarity,

latched, Drives 2 TTL loads.

at +25°C and nominal power supply voltage.

-2-

APPLYING THE AD2025 AND AD2028

Wirim! Connections

Figures 1 and 2 are wiring diagrams for AD2025 and AD2028

applications. The "limited differential" input uses a lOOn

resistor to isolate the analog input from the digital and power

supply sections to prevent ground loop problems. The analog

input must be connected between the "analog high" and

"analog ground" inputs only, since in some applications there

may be up to a :t200mV CMV difference between analog and

digital grounds.

"">cOG HIGH

=KEY

FUNCTION

Analog Gmund

10' Digit

= KEY

FUNCTION

Analog High

10' Digit (LSDI

BCD2

10' Digit

BCD8

Mux Step'

+5V de (Out)

AC High

AC Return

Digital Ground

DP .XXXXX

Polarity

Display Blank

DPXXXX.X

Overload

10' Digit

BCD 4

BCD 1

10' Digit IMSDI

-25V de (Outl

AC High

AC Return

Digital Gryund

Status

Hold

DPX.XXXX

DPXX.xXX

DPXXX.XX

OBS

Figure

AD2025

Wiring

Interconnections

INTEGRATION

CYCLE

'.K

Figure

AD2028 Wiring

Interconnections

NOTE 1: BCD multiplexer clock pulse available for

remote placement of BCD option.

AD2025

Signaland Pin Connections

FUNCTION

Polarity Indication

No direct polarity indication is provided on the AD2025 or

AD2028 although both DPMs measure bipolar inputs. If

indication of negative polarity is desired, the "polarity" out-

put can be connected to the far left-hand decimal point

(DP .XXXXX) provided. When the polarity is negative, this

decimal point will then be illuminated.

Interfacing 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 150ms between each conversion cycle.

The overload line is latched output which is at logic "1",

whenever the input exceeds the full 40,000 count range.

OLE

FUNCTION

Analog High

Analog Ground

Mux Step'

BCD 1

BCD 4

10' Digit

10' Digit (LSDI

BCD 8

BCD 2

10' Digit (MSD)

10' Digit

-25V de (Out)

Digital Ground

+5V (In)

Power Ground

+5V (In)

=KEY

= KEY

Display Blank

Hold

DPX.XXXX

DPXXX.XX

DP.XXXXX

Polarity

Status

Overload

DPXX.XXX

DPXXXX.X

AD2028

Signal and Pin Connections

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.

FUNCTION

BCD 20,000

+5V de linl

BCD I (lnl

= KEY

BCD 4 (lnl

BCD 2000

BCD 40

BCD 800

BCD 100

BCD 10,000

BCD 20

BCD8

BCD 1

BCD 400

Data Ready

Polarity Ilnl

Polarity (Out)

BCD 8 (In)

= KEY

BCD 2 (Inl

BCD4

BCD 80

BCD 8000

BCD 1000

BCD 200

BCD2

BCD 10

BCD 4000

10' Digit (lnl

Status IInl

Mux Step (lnl

Digi"'l Ground

SIGNAL

INTEGRATE

REFERENCE

INTEGRATE

(200n" MAX)

','

OIL RECOVER

"',

NOTES:

STATUS

,150m»

IDLE TIME

(150m> MIN)

11 Overload output is on main DPM connector.

21 Pins marked "In" are made available for remote

placement of BCD option card and are not

normally used since all connections are

intemal.

';;;:i~

.s,;:~~~

~/#//

A-

AD2025/AD2028

PARALLEL.DATA

READY FLAG

(NOTE 2)

BCD Options

Signal and Pin Connections

--i i--

NOTE 1

PARA~~~~,;DA TA

NOTE

W///ffff///////////////////

Sm> REOUIRED

TO LOAD

/ // /$////

PARALLEL.QUT

/ / // / //

REGISTERS.

1. APPROXIMATE

2. BOPTION.

Figure

AD2025/AD2028

Timing Diagram

-3-

4.215 (107.1)

-J-L

0.265

(6.73)

0000000

POWER SUPPLY INPUT

0 11 7 VAC 50~60 Hz

E 0 220 VAC 50-60 Hz

F 0 100 VAC 50-60 Hz

H 0 240 VAC 50-60 Hz

INPUT RANGE

DATA OUTPUT

0 :1:3.9999 VDC B 0 PARALLel

V 0 :l:39.999VDC

BCD

. DENOTES OPTION

AD2025

i("

5.10

(130)

4.48

(114)

GAIN ADJUST

INPUT

OFFSET

ADJUST

00000

"ANALOG

LIllI DEVICES

MADE

IN U.S.A.

....

C':

<.;

'<t

MOUNTING

BLOCK

)(

LENS

OBS

KEV BElWEEN PIN 2 & 3

FRONT VIEW

p\ 30 PIN CONNECTOR (B OPTION ONLV)

3.92 (99.6)

PANEL CUTOUT:

3.930 X 1.682 (99.82 X 42.72)

AD2025

Mechanical

shown

./'

SNAP-IN

MOUNTING

BLOCK

MOUNTING BLOCK TENSION SCREWS

. /

~ANALOG

WOEVICES

MADE IN USA

KEV BElWEEN

PIN 2 & 3

PI, 36 PIN CONNECTOR

3.420 (86.9) MAX

-li

AD2028

INPUT

RANGE

OLE

Figure

(Dimensions

Outline

in inches and (mmJ)

0.155 (3.94) MAX

- 0 :1:3.9999 VDC

V 0 :1:39.999 VDC

4.630

(117.6)

MAX

DATA OUTPUT

B 0 PARALLEL

BCD

4.085

(104)

MAX

ANALOG

LillI DEVICES

PATENT #3793563

MADE IN U.S.A.

SNAP-ON

DENOTES

OPTION

LENS

F-==3.020

FRONT

VIEW

(76.7)

MAX==--!

P2, 30 PIN CONNECTOR,

B OPTION ONL Y

PANEL CUTOUT:

3.175 X 1.810 (80.65 X 45.97)

Figure

AD2028 Mechanical

Outline

(Dimensions shown in inches and (mm))

P1, 30 PIN

CONNECTOR

KEV BElWEEN

PIN 10 & 11

-4-