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Analog Devices Semiconductor Electronic Components Datasheet



AD2020

3-Digit A/D Converter



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AD2020 pdf
,. ANALOG
W DEVICES
- -----
FEATURES
low Cost
12l lSI Design
Multiplexetf Character Serial BCD Output
-Support Components Required 10 (including displays)
Single +5V Power Supply Required
Balanced Differential Input
Internal Reference
low Power Consumption (SOmWtypical)
Small Size: 16 Pin Dual-in-Line
Wide Temperature Range: Operating 0 to +7SoC
Storage -SSoC to +150oC
Extended Temperature Range Available Upon
Special Request
12L
3 DigitAID Converter
II
GENERAL DESCRIPTION
The AD2020 is a low cost 3 digit AID Converter, needing only
10 additional support components to make a complete 3 digit
DPM/DVM. The small total component count, the low cost,
and high reliability allow for a wide variation in display appli-
cations, especially those previously utilizing APM's (Analog
Panel Meters).
The technology utilized in the AD2020 is Integrated Injection
Logic (I2L), an extension of the long proven, high yield bipolar
process. This technique offers a significantly higher circuit
packing density. The input amplifier, comparator, band-gap
reference, counters, clock, control logic, multiplexer and
drivers needed to implement the dual slope conversion, are all
included on a single die.
The AD2020, although it has an internal reference, consumes
only SOmW of power and is operated from a single +5V supply,
unlike most DPM chips requiring two (2) supplies.
The DPM chip is packaged in a standard size 16 pin-dual-in-line
package. Utilizing a unique double passivation and noble-metal
interconnect scheme, this plastic package offers essentially
hermetic performance over a wide temperature range. The chip
is available in two versions with differing guaranteed operating
temperature ranges. The standard AD2020 is specified from 0
to +7SoC and because of the special packaging technique, an
extended temperature version is also available upon request.
EXCELLENT PERFORMANCE
The AD2020 measures inputs from -99mV to +999mV with
an accuracy of 0.1% of reading:1:1 digit. The balanced differen-
tial input rejects common mode voltages up to 200mV dc,
enough to eliminate most ground loop problems. Polarity de-
tection is automatic and "+" and "-" Overload conditions are
indicated through BCD coding, i.e., BCD code for "+" Over-
load is 1011 and 1010 for "-" Overload. Zero shift is :!:0.5mV .
over the full operating temperature range resulting in the same
performance as a chip with Auto-Zero.
The benefits in manufacturing labor, inventory and reliability
are self-evident. The only external components required for a
complete digital display product are: 1 capacitor, 3 transistors,
1 decoder driver, 2 potentiometers and 3 displays, all operated
from a single 5 volt supply.
WHAT IS eL?
MOS and bipolar are the two basic LSI semiconductor proc-
esses. MOS produces very dense - therefore low-cost - logic
circuits, but has difficulty achieving precision analog circuitry.
Before 12L, bipolar could offer stable high-quality devices suit-
able for precision analog circuits, but logic consumed much
expensive chip area.
Integrated Injection Logic (12L) now allows the design of sin-
gle-chip devices containing both analog and digital functions,
without calling for the compromises required in the past. 12L
has a logic density that equals or exceeds that of MOS, while
employing a bipolar process suitable for precision analog
circuitry .
eL eliminates the complexity of conventional bipolar logic by
using inverted transistors (collectors and emitters are inter-
changed). Figure 1 shows a conventional transistor, with its
wraparound P+ isolation region, which is needed to separate
the collectors of adjacent transistors. When the transistors
are inverted, the collectors are automatically isolated, and the
emitters are grounded, at the same time.
.
-
AID CONVERTERS 403
--



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AD2020 pdf
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SPECIFICATIONS(@+25°C, Vcc= +5V)
PARAMETER
ACCURACY
Range
Accuracy
Unadjusted Gain
Unadjusted Zero Offset
Zero Width
Gain TemperatUre Coefficient
Offset TemperatUre Coefficient
Intercode Noise
ANALOG INPUT
Input Impedance
Bias Current
Common Mode
Voltage
Rejection Ratio
CONVERSION RATE
Normal
High Speed
CONTROL INPUT (PIN 6)
Normal Rate
Hold
High Speed
BCD OUTPUTS
Logic Low Sink Current
Logic High Leakage Current
DIGIT SELECT OUTPUTS
Digit "On" Sink Current
Digit "Off" Leakage Current
POWER SUPPLY
Operating Range
Supply Current
Power Supply Rejection
SPECIFICATIONS
MIN TYP
MAX
-99 +999
0.05 0.,1
0.94 1.0 1.06
-12 +12
1
SO
10.0
0.1
100
110
:1:0.2
SO
2 3.5 7
48 72 168
0.4V
0.8 1.6V
3.2
0.4 3.2
500
1.6 3.2
500
4.5 5.0 5.5
10.0 17.0
60
UNITS
mV
%RDG
mV
Count
ppm/oC
/JVfc
Counts
mn
nA
Vdc
dB
Conv.lsec
Conv.lsec
V
V
V
mA
pA
mA
pA
V
mA
dB
CONDITIONS
:tl Digit
Gain Pot @ 2.4kn
Zero Pot Centered
Gain Adjusted!
Offset Adjusted!
Hold Pin @ OV
Hold Pin ;;'3.2V
Pin May Be Left Open
Vo =";O.sV
=Vo 4.0V (open collector output)
=Vo 4.0V
=Vo 4.0V (open collector output)
VCC =S.OV
ABSOLUTE MAXIMUM RATINGS @ +2SoC'
Analog Input Voltage (pins 10 or 11 to pin 7) . . . . . . :l:lSV
Vcc toGND(pin 14topin7)
.+7V;-QV
Operating TemperatUre Range. . . . . . . . . . . . . . . . . . 0 to +7SoC
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . -55°C to + lS0oC
:Power Dissipation <'package) up to TA = +SSoC. . . . . 7S0mW
DeratesAbove+SS Cby
6.7mWfC
Lead TemperatUre. . . . . . . . . . . . . . . . . . . . . . . . . . . +26SoC for 10sec (max) at distance of 1116" :1:1132" from case to solder
OVERLOAD DECODING
Positive Overload: 1011 (decodes as "EEE" on display via 9374 decoder driver).
Negative Overload: 1010 (decodes as "- - -" on display via 9374 decoder driver).
Negative Indication: 1010 during MSD (decodes as "-88" on display via 9374 decoder driver).
I Unadjusted gain and zero result in additional T.C. of 3.3jJ.vfc
. Beyond which damage may occur.
Specifications subject to cbange without norice.
per unadjusted bit.
PIN CONFIGURA nON
TOP VIEW
AI (BCD DATA)
Ao (BCD DATA)
NSO
MSD
LSD
HOLD
GROUND
ZERO POT
1
2
3
4
5
6
7
8
16 AJ (BCD DATA)
15 A2 (BCD DATA)
14 +5 VOLTS
13 GAIN POT
12 INTEGRATING CAP
11 HIGH INPUT
10 LOW INPUT
9 ZERO POT
OUTLINE DIMENSIONS
Dimensionsshown in inches and (mm).
. .0.74508.92'
I 0.78509.931
I
[~~::]5=0.325 (8251
0.300 (7.621
1
O.O5O(1.27'
.200 IS.081
0.15513.941
L ~0.04511.14' .5013.811
A -~"t15°
::~::~: ~~ j L h0.065(1.651
J l~ 0.100rv.
l +-,25(3.171
--I
O.OZO10.511
(2.541
0.014 (0.351
404 A/D CONVERTERS
--- ---



Part Number AD2020
Description 3-Digit A/D Converter
Maker Analog Devices - Analog Devices
Total Page 4 Pages
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