TC7126 TC7126 TC7126A TC7126A 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS
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3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS
TC7126 TC7126 TC7126A TC7126A 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS
Temperature Drift Internal Reference TC7126 ppm/°C Typ. TC7126A ppm/°C Typ. Guaranteed Zero Reading With Zero Input Noise 15µVP-P High Resolution 0.05% Input Leakage Current Typ. 10pA Precision Null Detectors With True Polarity Zero High-Impedance Differential Input Convenient Battery Operation With Power Dissipation 500µW Typ. 900µW
GENERAL DESCRIPTION
TC7126A 3-1/2 digit CMOS analog-to-digital converter (ADC) containing active components necessary construct 0.05% resolution measurement system. Seven-segment decoders, digit polarity drivers, voltage reference, clock circuit integrated on-chip. TC7126A directly drives liquid crystal display (LCD), includes backplane driver. low-cost, high-resolution indicating meter requires only display, four resistors, four capacitors. TC7126A's extremely power drain battery operation make ideal portable applications. TC7126A reduces linearity error less than count. Roll-over error (the difference readings equal magnitude opposite polarity input signals) below count. High-impedance differential inputs offer leakage current 1012 input impedance. µVP-P noise performance guarantees "rock solid" reading, auto-zero cycle guarantees zero display reading with input. TC7126A features precision, low-drift internal voltage reference functionally identical TC7126. low-drift external reference normally required with TC7126A.
TYPICAL APPLICATIONS
Thermometry Bridge Readouts: Strain Gauges, Load Cells, Null Detectors Digital Meters Panel Meters Voltage/Current/Ohms/Power, Digital Scales, Process Monitors
TYPICAL OPERATING CIRCUIT
ORDERING INFORMATION PART CODE TC7126X
blank*
ANALOG INPUT 0.01
(reversed pins) blank (CPL only) parts have improved reference
2-19 SEGMENT 22-25 DRIVE MINUS SIGN BACKPLANE
ANALOG COMMON VBUFF
Package Code (see below): Package Code
0.33
TC7126 TC7126A VREF
Package
44-Pin PQFP 44-Pin PLCC 40-Pin PDIP 40-Pin PDIP (non-A only)
Temperature Range
+70°C +70°C +70°C 25°C +85°C
0.15
VINT
OSC2 OSC3 OSC1 COSC ROSC
CONVERSION/SEC
ANALOG COMMON (PIN NOTE: numbers refer 40-pin DIP.
AVAILABLE PACKAGES
40-Pin Plastic
44-Pin Plastic Quad Flat 44-Pin Plastic Chip Package Formed Leads Carrier PLCC
TC7126/A-8 11/6/96
TelCom Semiconductor reserves right make changes circuitry specifications devices.
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126A
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage V-). +15V Analog Input Voltage (Either Input) (Note Reference Input Voltage (Either Input) Clock Input TEST Operating Temperature Range Devices +70°C Devices 25°C +85°C Storage Temperature Range 65°C +150°C Lead Temperature (Soldering, sec) +300°C Power Dissipation 70°C) (Note 44-Pin PQFP 1.00W 44-Pin PLCC .1.23W 40-Pin PDIP .1.23W
*Static-sensitive device. Unused devices must stored conductive material. Protect devices from static discharge static fields. Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. These stress ratings only functional operation device these other conditions above those indicated operational sections specifications implied. Exposure Absolute Maximum Rating Conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS: +9V, fCLK 16kHz, +25°C, unless otherwise noted.
Symbol Input
Zero Input Reading Zero Reading Drift Ratiometric Reading Linearity Error Full Scale 200mV +70°C VREF, VREF 100mV Full Scale 200mV Deviation From Best Straight Line -VIN +VIN 200mV Full Scale 200mV ±1V, Full Scale 200mV 199mV, +70°C Temp Coeff 0ppm/°C 250k Between Common +70°C ("C" Devices): TC7126 TC7126A 25°C +85°C ("I" Device): TC7126A 250k Between Common (Note -000.0 ±000.0 999/1000 ±0.2 +000.0 1000 Digital Reading µV/°C Digital Reading Count
Parameter
Test Conditions
Unit
CMRR
Roll-Over Error Noise Input Leakage Current Common-Mode Rejection Ratio Scale Factor Temperature Coefficient Analog Common Temperature Coefficient
±0.2
Count µVP-P µV/V ppm/°C
Analog Common
VCTC 3.05 3.35 ppm/°C ppm/°C ppm/°C VP-P VP-P
Analog Common Voltage Segment Drive Voltage Backplane Drive Voltage Power Supply Current
Drive
NOTES:
Power Supply
Input voltage exceed supply voltages when input current limited 100µA. Dissipation rating assumes device mounted with leads soldered board. Refer "Differential Input" discussion. Backplane drive in-phase with segment drive "OFF" segment 180° out-of-phase "ON" segment. Frequency times conversion rate. Average component less than 50mV. "Typical Operating Circuit." During auto-zero phase, current 10-20 higher. 48kHz oscillator increases current (typical). Common current included.
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126A
CONFIGURATIONS
COMMON VBUFF
VREF VREF
VREF
TEST
VREF
COMMON
VINT
TEST
TC7126CLW TC7126ACLW (PLCC)
VBUFF VINT
TC7126CKW TC7126ACKW (FLAT PACKAGE)
NORMAL CONFIGURATION OSC2 TEST CREF CREF ANALOG COMMON VBUFF
OSC1 OSC2
REVERSE CONFIGURATION
10's 100's 1000's (MINUS SIGN)
TC7126CPL TC7126ACPL TC7126IPL TC7126AIPL
TEST VREF CREF CREF ANALOG COMMON VBUFF
TC7126RCPL TC7126ARCPL TC7126RIPL TC7126ARIPL 10's
100's
100's
100's
1000's (MINUS SIGN)
(BACKPLANE)
(BACKPLANE)
INTERNAL CONNECTION
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126A
DESCRIPTION
40-Pin PDIP Normal
(Reverse)
(40) (39) (38) (37) (36) (35) (34) (33) (32) (31) (30) (29) (28) (27) (26) (25) (24) (23) (22) (21) (20) (19) (18) (17) (16) (15) (14)
Name
VINT
Description
Positive supply voltage. Activates section units display. Activates section units display. Activates section units display. Activates section units display. Activates section units display. Activates section units display. Activates section units display. Activates section tens display. Activates section tens display. Activates section tens display. Activates section tens display. Activates section tens display. Activates section tens display. Activates section hundreds display. Activates section hundreds display. Activates section hundreds display. Activates section hundreds display. Activates both halves thousands display. Activates negative polarity display. Backplane drive output. Activates section hundreds display. Activates section hundreds display. Activates section hundreds display. Activates section tens display. Negative power supply voltage. integrating capacitor should selected give maximum voltage swing that ensures component tolerance buildup will allow integrator output saturate. When analog common used reference conversion rate readings second, 0.047 capacitor used. capacitor must have dielectric constant prevent roll-over errors. "Integrating Capacitor" section additional details. Integration resistor connection. resistor full-scale range resistor full-scale range. size auto-zero capacitor influences system noise. 0.33 capacitor full scale, 0.033 capacitor full scale. paragraph auto-zero capacitor more details. input signal connected this pin. high input signal connected this pin. This primarily used analog common-mode voltage battery operation systems where input signal referenced power supply. paragraph analog common more details. also acts reference voltage source.
(13) (12)
VBUFF
(11) (10)
VIN- VIN+ ANALOG COMMON
C-REF
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126A
DESCRIPTION (Cont.)
40-Pin PDIP Normal
(Reverse)
Name
CREF
Description
0.1µF capacitor used most applications. large common-mode voltage exists (for example, analog common), 200mV scale used, capacitor recommended will hold roll-over error count. analog input required generate full-scale output (1999 counts). Place between pins 199.9 full scale. Place between pins full scale. paragraph reference voltage. Lamp test. When pulled HIGH V+), segments will turned display should read -1888. also used negative supply externally-generated decimal points. paragraph under test additional information. Pins make oscillator section. 48kHz clock readings second), connect junction 180k resistor 50pF capacitor. 180k resistor tied capacitor tied
VREF VREF
TEST
OSC3 OSC2 OSC1
GENERAL THEORY OPERATION
(All Designations Refer 40-Pin DIP)
ANALOG INPUT SIGNAL INTEGRATOR SWITCH DRIVER VOLTAGE PHASE CONTROL CONTROL LOGIC POLARITY CONTROL
INTEGRATOR OUTPUT
COMPARATOR
Dual-Slope Conversion Principles
TC7126A dual-slope, integrating analog-todigital converter. understanding dual-slope conversion technique will following detailed TC7126A operational theory. conventional dual-slope converter measurement cycle distinct phases: Input signal integration Reference voltage integration (deintegration) input signal being converted integrated fixed time period (tSI), measured counting clock pulses. opposite polarity constant reference voltage then integrated until integrator output voltage returns zero. reference integration time directly proportional input signal (tRI). simple dual-slope converter, complete conversion requires integrator output "ramp-up" "rampdown." simple mathematical equation relates input signal, reference voltage, integration time:
DISPLAY VARIABLE REFERENCE INTEGRATE TIME
VFULL SCALE VFULL SCALE
FIXED SIGNAL INTEGRATE TIME
Figure Basic Dual-Slope Converter
VIN(t)
where: Reference voltage Signal integration time (fixed) Reference voltage integration time (variable).
CLOCK COUNTER
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126A
NORMAL MODE REJECTION (dB)
analog gates close feedback loop around integrator comparator. This loop permits comparator offset voltage error compensation. voltage level established compensates device offset voltages. auto-zero phase residual typically auto-zero cycle length 1000 3000 clock periods.
Signal Integration Phase
MEASUREMENT PERIOD 0.1/t INPUT FREQUENCY 10/t
auto-zero loop entered internal differen+ tial inputs connect VIN. differential input signal integrated fixed time period. TC7126A signal integration period 1000 clock periods, counts. externally-set clock frequency before clocking internal counters. integration time period fOSC 1000,
Figure Normal-Mode Rejection Dual-Slope Converter
constant VIN:
where fOSC external clock frequency. differential input voltage must within device common-mode range when converter measured system share same power supply common (ground). converter measured system share same power supply common, should tied analog common. Polarity determined signal integrate phase. sign true polarity indication, that signals less than correctly determined. This allows precision null detection limited only device noise auto-zero residual offsets.
dual-slope converter accuracy unrelated integrating resistor capacitor values, long they stable during measurement cycle. Noise immunity inherent benefit. Noise spikes integrated, averaged, zero during integration periods. Integrating ADCs immune large conversion errors that plague successive approximation converters high-noise environments. Interfering signals with frequency components multiples averaging period will attenuated. Integrating ADCs commonly operate with signal integration period multiple 50Hz/60Hz power line period.
Reference Integrate Phase
third phase reference integrate, deintegrate. internally connected analog common connected across previously-charged reference capacitor. Circuitry within chip ensures that capacitor will connected with correct polarity cause integrator output return zero. time required output return zero proportional input signal between 2000 internal clock periods. digital reading displayed 1000 VREF
ANALOG SECTION
addition basic integrate deintegrate dualslope cycles discussed above, TC7126A design incorporates auto-zero cycle. This cycle removes buffer amplifier, integrator, comparator offset voltage error terms from conversion. true digital zero reading results without external adjusting potentiometers. complete conversion consists three phases: Auto-zero phase Signal integrate phase Reference integrate phase
DIGITAL SECTION Auto-Zero Phase
During auto-zero phase, differential input signal disconnected from circuit opening internal analog gates. internal nodes shorted analog common (ground) establish zero input condition. Additional
TC7126A contains segment drivers necessary directly drive 3-1/2 digit LCD. backplane driver included. backplane frequency external clock frequency 800. conversions second backplane frequency 60Hz with nominal amplitude.
TYPICAL SEGMENT OUTPUT SEGMENT OUTPUT
TC7126A
INTERNAL DIGITAL GROUND
RINT BUFF INTEGRATOR SEGMENT DECODE COMPARATOR
THOUSANDS
CREF VINT DIGITAL SECTION SEGMENT DECODE SEGMENT DRIVERS
CINT
VREF
VREF
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS
SEGMENT DECODE
HUNDREDS
DATA LATCH
Figure TC7126A Block Diagram
TENS
2.8V CLOCK TEMPCO VREF SWITCH DRIVERS FROM COMPARATOR OUTPUT fOSC ROSC COSC
UNITS
6.2V CONTROL LOGIC
ANALOG COMMON
INTERNAL DIGITAL GOUND
TEST
TC7126 TC7126A
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126A
When segment driver in-phase with backplane signal, segment OFF. out-of-phase segment drive signal causes segment visible. This drive configuration results negligible voltage across each segment, ensuring long life. polarity segment driver negative analog inputs. reversed, this indicator would reverse. TC7126A, when TEST pulled segments turned display reads -1888. During this mode, segments have constant voltage impressed. LEAVE DISPLAY THIS MODE MORE THAN SEVERAL MINUTES; LCDS DESTROYED OPERATED WITH LEVELS EXTENDED PERIODS. display font segment drive assignment shown Figure TC7126A drop-in replacement TC7126 ICL7126 that offers greatly improved internal reference temperature coefficient. external component value changes required upgrade existing designs.
COMPONENT VALUE SELECTION Auto-Zero Capacitor (CAZ)
size some influence system noise. 0.33µF capacitor recommended 200mV full-scale applications where 100µV. 0.033µF capacitor adequate full-scale applications. Mylar-type dielectric capacitor adequate.
Reference Voltage Capacitor (CREF)
reference voltage, used ramp integrator output voltage back zero during reference integrate phase, stored CREF. 0.1µF capacitor acceptable when VREF tied analog common. large common- mode voltage exists (VREF analog common) application requires full scale, increase CREF Roll-over error will held less than count. Mylar-type dielectric capacitor adequate.
System Timing
oscillator frequency prior clocking internal decade counters. three-phase measurement cycle takes total 4000 counts (16,000 clock pulses). 4000-count cycle independent input signal magnitude. Each phase measurement cycle following length: Auto-zero phase: 1000 3000 counts (4000 12,000 clock pulses) signals less than full scale, auto-zero phase assigned unused reference integrate time period. Signal integrate: 1000 counts (4000 clock pulses) This time period fixed. integration period 4000 fOSC
Integrating Capacitor (CINT)
CINT should selected maximize integrator output voltage swing without causing output saturation. TC7126A's superior analog common temperature coefficient specification, analog common will normally supply differential voltage reference. this case, full-scale integrator output swing satisfactory. readings second (fOSC kHz), 0.047µF value suggested. reading second, 0.15 recommended. different oscillator frequency used, CINT must changed inverse proportion maintain nominal integrator swing. exact expression CINT (4000) CINT where: fOSC RINT VINT
where fOSC externally-set clock frequency. Reference integrate: 2000 counts 8000 clock pulses)
DISPLAY FONT
fOSC RINT
1000's
100's
10's
VINT Clock frequency Full-scale input voltage Integrating resistor Desired full-scale integrator output swing.
Figure Display Font Segment Assignment
readings second, resistor should placed series with CINT. This increases accuracy compensating comparator delay. CINT must have dielectric absorption minimize roll-over error. polypropylene capacitor recommended.
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126A
Integrating Resistor (RINT)
input buffer amplifier integrator designed with Class output stages. output stage idling current 6µA. integrator buffer supply drive current with negligible linearity errors. RINT chosen remain output stage linear drive region, large that board leakage currents induce errors. 200mV full scale, RINT 180k. full scale requires 1.8M. Component Value
RINT CINT
NOTE:
input voltage two, reference voltage should 200mV. This permits transducer input used directly. differential reference also used where digital zero reading required when equal zero. This common temperature-measuring instrumentation. compensating offset voltage applied between analog common VIN. transducer output con+ nected between analog common.
Nominal Full-Scale Voltage
0.33 0.047 0.033 0.047
DEVICE FUNCTIONAL DESCRIPTION
(Pin Numbers Refer 40-Pin DIP)
Differential Signal Inputs
(Pin 31), (Pin TC7126A designed with true differential inputs accepts input signals within input stage commonmode voltage range (VCM). Typical range V-+1V. Common-mode voltages removed from system when TC7126A operates from battery floating power source (isolated from measured system), connected analog common (VCOM). (See Figure systems where common-mode voltages exist, TC7126A's common-mode rejection ratio minimizes error. Common-mode voltages however, affect integrator output level. worst-case condition exists large positive exists conjunction with full-scale negative differential signal. negative signal drives integrator output positive along with (see Figure such applications, integrator output swing reduced below recommended full-scale swing. integrator output will swing within 0.3V without increased linearity error.
fOSC 48kHz readings sec).
Oscillator Components
COSC should 50pF; ROSC selected from equation: fOSC 0.45
clock conversions second), 180k. Note that fOSC generate TC7126A's internal clock. backplane drive signal derived dividing fOSC 800. achieve maximum rejection 60Hz noise pickup, signal integrate period should multiple 60Hz. Oscillator frequencies 24kHz, 12kHz, 80kHz, 60kHz, 40kHz, etc. should selected. 50Hz rejection, oscillator frequencies 20kHz, 100kHz, 66-2/3kHz, 50kHz, 40kHz, etc. would suitable. Note that 40kHz (2.5 readings second) will reject both 50Hz 60Hz.
Differential Reference
VREF (Pin 36), VREF (Pin reference voltage generated anywhere within power supply range. prevent roll-over type errors being induced large common-mode voltages, CREF should large compared stray node capacitance. TC7126A offers significantly improved analog common temperature coefficient. This potential provides very stable voltage, suitable voltage reference. temperature coefficient analog common typically ppm/°C TC7126A ppm/°C TC7126.
Reference Voltage Selection
full-scale reading (2000 counts) requires input signal twice reference voltage.
Required Full-Scale Voltage*
*VFS VREF.
VREF
100mV
some applications, scale factor other than unity exist between transducer output voltage required digital reading. Assume, example, pressure transducer output 2000lb/in.2 400mV. Rather than dividing
ANALOG COMMON (Pin analog common voltage potential approximately below potential guaranteed between 2.7V 3.35V below Analog common tied internally N-channel capable sinking 100µA. This will hold common line should
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126A
SEGMENT DRIVE
MEASURED SYSTEM
POWER SOURCE
VBUFF VINT TC7126A ANALOG COMMON VREF VREF
OSC1 OSC3 OSC2
Figure Common-Mode Voltage Removed Battery Operation With Analog Common
external load attempt pull common line toward Analog common source current limited 1µA. Therefore, analog common easily pulled more negative voltage (i.e., below 3V). TC7126A connects internal inputs analog common during auto-zero phase. During reference-integrate phase, connected analog common. externally connected analog common, common-mode voltage exists, rejected converter's common-mode rejection ratio. battery operation, analog common usually connected, removing common-mode voltage concerns. systems where connected power supply ground given voltage, analog common should connected VIN. analog common serves analog section reference, common point. TC7126A specifically designed operate from battery measurement system where input signals referenced (float) with
Where: 4000 Integration time Integration capacitor Integration resistor INTEGRATOR
respect TC7126A's power source. analog common potential gives battery life voltage. common potential 0.001%/% voltage coefficient output impedance. With sufficiently high total supply voltage >7V), analog common very stable potential with excellent temperature stability (typically 35ppm/°c). This potential used generate TC7126A's reference voltage. external voltage reference will unnecessary most cases because 35ppm/°C temperature coefficient. "TC7126A Internal Voltage Reference" discussion. TEST (Pin TEST potential less than TEST used negative power supply connection external CMOS logic. TEST tied internally-generated negative logic supply through resistor. TEST load should more than "Digital Section" additional information using TEST negative digital logic supply. TEST pulled HIGH V+), segments plus minus sign will activated. OPERATE THIS MODE MORE THAN SEVERAL MINUTES. With TEST= segments impressed with voltage which will destroy LCD.
INPUT BUFFER
TC7126A Internal Voltage Reference
TC7126A's analog common voltage temperature stability been significantly improved (Figure version industry-standard TC7126 device allows users upgrade systems design systems without external voltage references. External values need changed. Figure shows analog common supplying necessary voltage reference TC7126A.
Figure Common-Mode Voltage Reduces Available Integrator Swing (VCOM VIN)
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126A
ANALOG COMMON TEMPERATURE COEFFICIENT (ppm/°C)
TC7126A
Figure Analog Common Temperature Coefficient
MAXIMUM SPECIFIED TYPICAL
GUARANTEED MAXIMUM SPECIFIED MAXIMUM TYPICAL TYPICAL
TC7126A VREF VREF VREF ANALOG COMMON
ICL7126
ICL7136
VREF VFULL SCALE
Figure TC7126A Internal Voltage Reference Connection
Flat Package APPLICATIONS INFORMATION Liquid Crystal Display Sources
Several manufacturers supply standard LCDs interface with TC7126A 3-1/2 digit analog-to-digital converter. Representative Manufacturer Address/Phone Part Numbers*
Crystaloid Electronics 5282 Hudson Dr., Hudson, 44236 216-655-2429 Palomar Avenue Sunnyvale, 94086 408-523-8200 1800 Vernon St., Ste. Roseville, 95678 916-783-7878 Lake St., Lake Mills, 53551 414-648-2361 C5335, H5535, T5135, SX440 0801, 0203 I1048, I1126
TC7126A available epoxy 64-pin formedlead flat package. test socket TC7126ACBQ device available: Part 51-42 Manufacturer: Yamaichi Distribution: Nepenthe Distribution 2471 East Bayshore Suite Palo Alto, 94043 (415) 856-9332
Ratiometric Resistance Measurements
TC7126A's true differential input differential reference make ratiometric readings possible. ratiometric operation, unknown resistance measured with respect known standard resistance. accurately-defined reference voltage needed. unknown resistance series with known standard current passed through pair. voltage developed across unknown applied input voltage across known resistor applied reference input. unknown equals standard, display will read 1000. displayed reading determined from following expression: Displayed reading RUNKNOWN RSTANDARD 1000.
VGI, Inc.
Hamlin, Inc.
3902, 3933, 3903
*NOTE:
Contact manufacturer full product listing/specifications.
Decimal Point Annunciator Drive
TEST connected internally-generated digital logic supply ground through resistor. TEST used negative supply external CMOS gate segment drivers. annunciators decimal points, battery indication, function indication added without adding additional supply. more than should supplied TEST pin: potential approximately below
display will overrange RUNKNOWN RSTANDARD.
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126A
Simple Inverter Fixed Decimal Point Display Annunciator 4049 TC7126A BACKPLANE DECIMAL POINT
STANDARD
VREF
UNKNOWN ANALOG COMMON TC7126A
TEST
Multiple Decimal Point Annunciator Driver
Figure Parts Count Ratiometric Resistance Measurement
TC7126A
DECIMAL POINT SELECT
DECIMAL POINTS
TEST
4030
Figure Decimal Point Annunciator Drives
1N4148 0.02 200V AD636 TC7126A ANALOG COMMON
0.01
SEGMENT DRIVE
VARIABLE VARIABLE
Figure 3-1/2 Digit True
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126A
TC7126A VREF VREF COMMON 0.7%/°C 1N4148 TC7126A VREF VREF COMMON
1N4148 SENSOR
Figure Temperature Sensor
Figure Positive Temperature Coefficient Resistor Temperature Sensor
VOUT REF02 TEMP
CONSTANT VREF VREF TC7126A VOUT 1.86V +25°C COMMON
LM358
TEMPERATURE DEPENDENT OUTPUT
Figure Integrated Circuit Temperature Sensor
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126A
PACKAGE DIMENSIONS 40-Pin PDIP
.555 (14.10) .530 (13.46)
2.065 (52.45) 2.035 (51.49)
.610 (15.49) .590 (14.99)
.200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92) .040 (1.02) .020 (0.51) .015 (0.38) .008 (0.20) .700 (17.78) .610 (15.50) .022 (0.56) .015 (0.38) MIN.
.110 (2.79) .090 (2.29)
.070 (1.78) .045 (1.14)
44-Pin PLCC
.050 (1.27) TYP. .695 (17.65) .685 (17.40) .656 (16.66) .650 (16.51)
.021 (0.53) .013 (0.33) .630 (16.00) .590 (15.00) .032 (0.81) .026 (0.66)
.656 (16.66) .650 (16.51) .695 (17.65) .650 (17.40) .180 (4.57) .165 (4.19)
.020 (0.51) MIN. .120 (3.05) .090 (2.29)
Dimensions: inches (mm)
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126A
PACKAGE DIMENSIONS (Cont.) 44-Pin PQFP
MAX. .009 (0.23) .005 (0.13)
.018 (0.45) .012 (0.30)
.041 (1.03) .026 (0.65)
.398 (10.10) .390 (9.90) .557 (14.15) .537 (13.65)
.031 (.080) TYP.
.398 (10.10) .390 (9.90) .557 (14.15) .537 (13.65)
.010 (0.25) TYP. .083 (2.10) .075 (1.90) .096 (2.45) MAX. Dimensions: inches (mm)
Sales Offices
TelCom Semiconductor 1300 Terra Bella Avenue P.O. 7267 Mountain View, 94039-7267 TEL: 650-968-9241 FAX: 650-967-1590 E-Mail: liter@c2smtp.telcom-semi.com TelCom Semiconductor Austin Product Center 9101 Burnet Suite Austin, 78758 TEL: 512-873-7100 FAX: 512-873-8236 TelCom Semiconductor H.K. Ltd. Chuk Street, Ground Floor Kong, Kowloon Hong Kong TEL: 852-2324-0122 FAX: 852-2354-9957
Printed U.S.A.
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