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ICL7135CJIHARRISN/a33avai4 Digit A/D Converter with Multiplexed BCD Outputs
ICL7135CQIMAXIMN/a22avai4 Digit A/D Converter with Multiplexed BCD Outputs


ICL7135CJI ,4 Digit A/D Converter with Multiplexed BCD OutputsELECTRICAL CHARACTERISTICS (Note 1) (V+ - +5V, v- -- -tiV, TA -- 25''C, Clock Frequency Set tor ..
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ICL7135CJI-ICL7135CQI
4 Digit A/D Converter with Multiplexed BCD Outputs
19-5041; Rev tk 1987
2ElAL4iDaLfiyil
4% Digit AID Gan verter with
Multiplexed BGD Outputs
Oanoral Description
The Maxim ICL7135 is a high preclston monolithic 4%
digit AID converter. Dual slope conversion reliability is
combined with Al in 20,000 count accuracy and a
2.0000V full scale capability. It features high impedance
differential Inputs. naany ideal differential llnearlty, true
ratiomettitr operation, auto zero and auto-polarity. The
multiplexed BCD outputs and digit drivers provide easy
interface to external display drivers like the Maxim
KW7211A. The only other external Components needed
to make precision DVM/DPMs are a reference and a
clock. For more com lex systems the BCD outputs are
enhanced by , OVERRANt3E, UNDERRANGE,
RUN/ and BUSY lines providing easy Interface to
microprocessors and UARTs. This Interfacing capability
makes the ICL7135 an ideal device for use in microproc-
essor based data acquisition and control systems.
The ICL7135 has auto-zero accuracy better than IWW,
zero drift of 0.5pV/"C, input bias current of 10pA max.
and rollover error of less than 1 count.
Applicationa
This device is used in a wide range of measurement ap-
plications involving the manipulation and display of ana-
log data:
Pressure Weight
Voltage Current
Resistance Speed
Temperature Material Thickness
__ _Pln Crtrtrhrurquetrt
If-c 1 V " DUNDERRANGE
REFERENCEE 2 27 DOVERRANGE
ANALOG WONG 3 20 2
INT OUT: 4 25 JRIFI
AZ INC 5 " :DIGITAL GND
BUFF OUTC 6 23 JPOL
REF. tthp-c T 4m... 22 "LOCK IN
REF. CAP“: B ICU'” 21 DBUSY
IN uv 9 20 a(LSD) m
IN HIE 10 19 302
V+E 11 18 :03
(M80) DSc 12 17 :04
(L83) " 13 " BaSB) Ba
B2c " 15 D
NOTE: All packages have the same pinout.
Features
. Improved 2nd Source
(See our "Maxim Advantage'' Page 3)
o * 20,000 Count Rttttttlutltttt
. Guaranteed i1 Count accuracy
. Ovor-range, under-rango signals for auto-range
capablllty
. Easy lntertaco to UARTa and HPts
. TTL compatible. Multiplexed BCD outputs
. True dmorontlal Input. Zero reading guaranteed
for 0 volt Input
. True polarity at zero for preclse null detection
. Monollthlc CMOS design
Ordering Information
PART TEMP. RANGE PACKAGE
ICL71356J| trc to 70'C 28 Lead CERDIP
ICL7135CP| tPC to 70‘C 28 Lead Plastic DIP
|CL713500| trc to 70'C 28 Lead Plastic chip earner
ICL71 550/ D O'C to 70°C Dice
__1yplcal Operating Circuit
F---'"--]
OR m m BRT mm,
D, o, a
0: g n:
"qANtAqtM m +8888
ICL71)! fa',",',", . ,
SW; *3 LED DISPLAY
POL Bt M
The "Maxim AdvtmtttgtP'"signiWs an upgraded quality level. At no additional cost we omrra stttttyntt-stturtttt device that is subject to the
following: guaranteed performance over 19mperature along with tighter test specifications on many key parameters; and device
enhancements, when needed, that result in improved performance without changing the functionality.
ummmr-MW 1
9611 73!
I017 135
414 Digit tun Gan verter with
Multiplexed BOD Outputs
ABSOLUTE M AXIMUM RATINGS Lead Temperature (Soldering, 10 sec) .............. 3000
Power Dissiga ation (Note 2) Supply Voltage 't ............................... + 6V
CERDIP ackage ................rq... . ................................ HN
Plastic Package ..-... go 8nalog Input Voltage (either input) (Note 1) ...... v+ to V'
Operatin Temperature .................... 0'C to +70’C Reference lnputVoltage (either Input) ....... . Ne to V‘
Storage emperature ..F.........rq... - 65.0 to + 160% Clock Input ................................. Gnd to V +
Note lt Irvut voltages may exceed the supply voltages provided the Input current In limited to +1OOFA.
Mon 2: Dissipation mung assumes demo is mounted with all leads soldered to printed chum Board.
Stresses above those wed under "Absolute Maximum Ramcs' may cause permanent damage to the thMctt.Thttatt are stress ratings only and tixtttitmal
operation ot the device at than or my other conditions above those indicated In the counting] sections of the apodfieatiorts Is not Implied. Exposure to absolute
mmdmum rating txmdltkms tor extended period! may ttttttth device reliability.
|CL7135 ELECTRICAL CHARACTERISTICS (Note 1)
(V+ - +SV,V- - -5V.TA - 25‘C.c10ck FhsmmrteySerttar3 Reading/Sec
CHARACTERISTICS SYMBOL CONDITIONS MIN TYP MAX UNITS
A Zero Input Reading = th 0V -0.0000 *0.0000 + 0.0000 Digital
N Full Scale "' 2. 000V Reading
A Ratiometritr Reading (2) VIN'" =vn REF + 0.9998 +0.9999 + 1.0000 Digital
(5 Full s'caIe - 2.ooov Reading
G Linearity over * Full Scale Digital
(error of reading from -2V s V.” s +2V 0.5 1 Count
best straight line) Error
Differential Uneamy
(difference between worse -2V s " s +2V .01 LSB
case step of adjacent counts
and ideal step)
Rollover error (Difference In Pigitat
reading for equal positive & -Vm _ +VIN 'a'S 2V 0.5 1 Count
negative voltage near full scale) Error
(Note 1) Noise (P-P value not Sn = 0V
(Note 2) exceeded 95% of time) Full stat, = 2. 000V 15 pV
Leakage Currentat Input IILK VIN = 0V 1 10 pA
Zero Reading Drift VIN = 0V 0.5 2 1NPtl
tr g TA S 70'0
Scale Factor Temperature TC VIN -- + 2V
Coema'entW) ir' s TA s 70°C 2 5 ppml'c
(ext. rat. 0 ppmPC)
VINH 2.8 2.2 v
VINL 1.6 0.8
INPUTS Clock In, Run/Flaa IINL VIN - 0 0.02 0.1 mA
IINH VIN = +5V 0.1 10 M
0 All Outputs VOL IOL = 1.6mA 0.25 0.40 V
U Be, Ba, B4, w, VOH lor, = -1I11A 2.4 4.2 V
T th, Dz, Ds D4, Ds
D P BUSY y,MMM VOH IOH = -10PA 4.9 4.99 v
I U "iiiiiiiiiiiifi," UNDER- RANGE
<3 T POLA RITY
I s +5VSupplyRange v+ +4 +5 +6 v
L g -5V Supmnange v- -3 -5 -8 v
p ' 5V Supply Current I+ to " 0 1.1 3.0 mA
L --5V Supply Current I' to = O 0.8 3.0
Y Power Dissipation Capacitance CPD vs. Clock Freq 40 pF
Clock Clock Freq (Note 4) DC 2000 1200 kHz
Mom tt Tom In 4% digit (20,000 count) circuit shown in Fig. t, clock frequency 120kHz.
Not:- 2: Toned with a low dielectric absorption integrating capacitor. 809 Camporwm Selecuon Section.
Nttt"tTNrtsrtoperaturerantNtxtntxontttrrtdtsdto +70‘Cmd trsryoMasexmtothetautrFzsrrytutdrrtftrtxmcs tsapacitorsarrtirteroasodtonbtstxtsttttsNghttr
leakage ot the ICL7135.
Not. 4: This apeefWation relates to the dock quuency rungs over which the ICL7135 will comactly pMorm Its vnriou: functions See "Max Cqtttth Frequency"
below for Ilmlmions on the clock frequency range in a system.
The electrical trhametttrfstitm above are a reprmmon ola panbn of Infant‘s copyrighted (1980/1984) dam book This Inhxmatkxt does ttttt commits any
mprastmtatitmtryMaxim ttt1ttinttrmif'stxrxhsts willpedormintteetxttanea mm tNmtspmmteatiorts. m, ''EietttrttrttlChttmgtttristitm Tabla"alom Mm tho
desa'wlva excerpts from the original mamfacrwor's data sheet have been included In this data sheet solely for txtmparatMrpurpostss.
2 MAXIM
ic,good price


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