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ICL7109CQHMAXIMN/a200avai12 Bit A/D Converter With 3-State Binary Outputs
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ICL7109CQH-ICL7109IJL-ICL7109MJL
12 Bit A/D Converter With 3-State Binary Outputs
A __ General Description
The K2L7109 is a monolithic 12 bit A/D converter
designed for easy interface with microprocessors
and UARTs. The 12 bit binary plus polarity and over-
range outputs can be directly interfaced to a micro-
processor bus. In this modethe ICL7109 is controlled
by the microprocessor through the chip select and
two byte enable inputs. For remote data logging
applications the ICL7109 outputs are easilyconverted
to a UART handshake mode, working with industry
standard UARTs to provide serial data transmission.
This device offers high accuracy by lowering rollover
error to less than 1 count and zero reading drift to
less than 1 p)//oC. In many data acquisition systems
the ICL7109 is an attractive, low cost, one-per-
channel alternative to analog multiplexing due to
its low power consumption and input bias current.
Maxim has added a zero-integrator phase to the
ICL7109, eliminating overrange hangover, "crosstalk"
and hysteresis effects. Maxim has also increased the
current sourcing capabilities of the ICL7109, enabling
it to rapidly drive the large capacitances often found
on microprocessor busses.
Applications
This device is used in a wide range of dataacquisition
and control applications. Most applications involve
the measurement of analog data:
Pressure Speed Voltage
Resistance Flow Weight
Temperature Power Current
_ - - Typical Operating Circuit
dMlAL/llDi'ClLMM]
" Bit A/D Converter With
3-State Binary Outputs
”K 7 Features
. Improved 2nd Source! (See 3rd page tor
"Maxim Advantage"'"),
. Zero Integrator Phase for Fast Overload
Recovery
Hysteresis and "CrosstaW' Eliminated
Enhanced Bus Driving Capability
Byte Organized Three-state Outputs
UART Handshake Mode for Serial Interfacing
True Differential Input and Reference
Up to 30 Conversions per Second
Significantly Improved ESD Protection
. Monolithic, Low Power CMOS Design
- Ordering Information
-r'ART, TEMP. RANGE QCKAGE - -
FICL7109MJ£ -si"cito" ~_1‘2‘S_°_(_JEQLeadEERE;P
ICL_7_109IJL -2o°_c to £9 -40/-tiyL9EH_rl1e
ICLnosm
40 Lead Plastic DIP
44 Lead Plggg: Chip Carrier,
0'C to +7000 Dice
03-0 to +70°C
iCL7109CQH 70°C to ¢70°C
IGL7109C/D
--- Pin Configuration
ADDRESS BUS
, CONTROL BUS
l, l glii
i l _ V43||
Ham (am
so B12 L
POL OR
ijf1!,g' MICROPROCESSOR
BIB8--
ANALOG
m. (310m --l
MODE HOLD
GND 'SV
DIRECT INTERFACE
Top View A ' - 40 Lead DIP
GND I o 40. (
STATUS 'ri, Cs9. REF IN
q POL E 33' REF CAP -
HIGH on 747 g RFF CAP
ORDER B12 _3 _ REF IN .
BTTE Bll Q Ts IN HI
OUTPUTS l am 1 34' IN LC)
B9 _ a 33' COMMON
as T T12 INT
- MIIXIM *7
I l AZ
B7 ‘71 (Cl 7109 ,
Low as 1:1 L" BUF
ORDER as L1 g REF our
BYTE B4 Tsa. 74" v-
ouwms B3 G; g] SEND
B2 js" " nunim
31F gs" nu: osc OUT
TEST E ‘24: osc SEL
BYTE I LE4 E Ts osc OUT
CONTROL HBEN E Lose m
INPUTS I bE coAr5 Q0 -viMODE
See Last Page for 44 Lead Chip Carrier Pin Configuration
The "Maxim Advantage "rr' Sigmlies an upgraded quality level At no additional cost we offer a second-source dewco mat is sumac! to me lolio wmg. guaranteed
parlomiance over temperature along with tighter test specifications on many key parameters: and do VICG enhancements. when needed, that result in Improved
ourlorznance Wlfhou! changing the Iuncnonaliry.
lVI/JXl/Vl
Call toll free 1-800-998-8800 for free samples or literature.
Maxim Integrated Products 1
601-179!
ICL7109
" Bit A/D Converter With
3-State Binary Outputs
ABSOLUTE MAXIMUM RATINGS
Positive Supply Voltage (GND to V') ............ +6.2V Operating Temperature
Negative Supply Voltage (GND to W) ............ AN Cerdip Package (MJL) ........ -55''C i» TA :' +125°C
Analog Input Voltage (Lo or Hi) (Note 1) ..... ( to V- Cerdip Package (CJL) ..._.._. -20°C "asf TA "c:" +85°C
Reference Input Voltage (Lo or Hi) (Note 1) .. ( to V’ Plastic Package (CPL) ........... 0°C : TA _ +70°C
Digital Input Voltage Plastic Chip Carrier
(Pins 2-27) (Note ) .. GND - 0.3V S' VIN c, V+ e 0.3V (Quad) Package (Q) .............. 0°C "u" T c, 70°C
Power Dissipation (Note 3) Storage Temperature ........... -65°C 5 TA Cu" +160°C
Cerdip Package ...................... 1W @ +85°C Lead Temperature (Soldering, 10 sec.) ........ -300oC
Plastic Packa e .................. 500mW @ +70°C
Plastic Chip arrier (Quad) ....... 400mW @ +70°C
Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the devrce. These are stress ratings only.
and functional operation of the device at these or any other conditions above those indicated In the operational sections of the specifications
is not Implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(All parameters with V* = +5V. V‘ = -5V, GND = OV, TA = 25°C, unless noted.)
ANALOG SECTION
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
' VIN = 0.OV - Octal
Zero Input Readtng Full Scale = 409.6mV 000% t00008 f00008 Reading
_ _ _ VIN = VREF 3777a Octal
Ratiometric Reading VREF = 204.8mV 37778 40008 40008 Reading
Non-Linearity (Max deviation Full Scale = 409.6mV to 4,096V 1 Y 2 +1 Counts
from best straight line fit) Over full operating temperature range. -
Roll-over Error (difference in -
reading for equal pos. and Cud/trc/d/le,'),)', 2326:, r n -1 td +1 Counts
neg, inputs near full scale) p g p U e a ge.
Common Mode Rejection Ratio CMRR 'tg $353555ng 50 1NIN
7 Input Common Mode Range VCMR Input Hi, Input Low, Common V' +1.5 V+ -1,5 V
Noise (p-p value not e VIN - ov 15 V
exceeded 95% ot time) n Full Scale = 409.6mV u
VIN = 0 All devices 25°C 1 10 pA
ICL7109CPL 0°C s: TA S +70°C 20 100 pA
Leakage current at Input "LK lCL7109lDC -25'C S" TA g +85°C 100 250 PA
ICL7109MDL 65°C 5 TA c, t125% 2 5 nA
Zero Reading Drift VIN = 0V 0.2 1 pV/OC
Scale Factor Temperature VIN = 408.9mV = > 77708 reading 1 5 rn/°C
Coefficient Ext. Ref. 0 ppm/°C pp _
Supply Current V+ to GND " VIN = 0, Crystal Osc, 700 1500 “A
3.58MHZ test circuit
Supply Current ve to V“ ISUPP Pins 2-21, 25, 26, 27, 29, open 700 1500 PA A
Referred to V*, 25kn - i '
Ref Out Voltage VHEF between V+ and REF OUT 2.4 2.8 " V
Ref Out Temp, Coefficient 25kt) between V+ and REF OUT 80 ppm/°C
V+ -0.5
Input Common Mode Range VCM IN HI, IN LO, COMMON v- +1.5 to V' -1.0 V
v- +1.0
Note 1:
Note 2:
Input voltages may exceed the supply voltages, provided the input current is limited to :100 MA.
Due to the SCR structure inherent in the process used to fabricate these devices, connecting any digital inputs or outputs to
voltages greaterthan V" or less than GND maycause destructive device latchup. For this reason it is recommended that no inputs
from sources other than the same power supply be applied to the ICL7109 before its power supply is established, and that m
multiple supply systems the supply to the ICL7109 be activated first.
Note 3:
This limit refers to that of the package and will not be obtained during normal operation.
The electrical characteristics above are a reproduction of a portion of Intersil's copyrighted (1983/1984) data book. This information dges
not constitute any representation by Maxim that Intersll's products will perform in accordance with these specifications. The "Electrical
Characteristics Table" along with descriptive excerpts from the original manufacturer's data sheet have been included in this data sheet
solely for comparative purposes.
lVl A X I IVI
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