TC7106 TC7106 TC7106A TC7106A TC7107 TC7107 TC7107A TC7107A 3-1/2

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TC7106 TC7106 TC7106A TC7106A TC7107 TC7107 TC7107A TC7107A 3-1/2

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3-1/2 DIGIT CONVERTERS
TC7106 TC7106 TC7106A TC7106A TC7107 TC7107 TC7107A TC7107A
3-1/2 DIGIT CONVERTERS
Internal Reference with Temperature Drift TC7106/7 80ppm/°C Typical TC7106A/7A 20ppm/°C Typical Drives (TC7106) (TC7107) Display Directly Guaranteed Zero Reading With Zero Input Noise Stable Display Auto-Zero Cycle Eliminates Need Zero Adjustment True Polarity Indication Precision Null Applications Convenient Battery Operation (TC7106A) High Impedance CMOS Differential Inputs 1012 Differential Reference Inputs Simplify Ratiometric Measurements Power Operation 10mW
GENERAL DESCRIPTION
TC7106A TC7107A 3-1/2 digit direct-display drive analog-to-digital converters allow existing 7106/7107 based systems upgraded. Each device precision reference with 20ppm/°C temperature coefficient. This represents times improvement over similar 3-1/2 digit converters. Existing 7106 7107 based systems upgraded without changing external passive component values. TC7107A drives common anode light emitting diode (LED) displays directly with segment. low-cost, high-resolution indicating meter requires only display, four resistors, four capacitors. TC7106A power drain battery operation make suitable portable applications. TC7106A/TC7107A reduces linearity error less than count. Rollover error difference readings equal magnitude opposite polarity input signals below count. High impedance differential inputs offer leakage current 1012 input impedance. differential reference input allows ratiometric measurements ohms bridge transducer measurements. 15µVP-P noise performance guarantees "rock solid" reading. auto-zero cycle guarantees zero display reading with zero-volts input.
ORDERING INFORMATION PART CODE TC710X
blank* (reversed pins) blank (CPL only) parts have improved reference Package Code (see below):
0.1µF DISPLAY (TC7106/A) COMMON ANODE DISPLAY (TC7107/A) 2-19 22-25 SEGMENT DRIVE BUFF 0.47µF 0.22µF VINT MINUS SIGN BACKPLANE DRIVE
Package Code Package
44-Pin PQFP 44-Pin PLCC 40-Pin PDIP 40-Pin PDIP 40-Pin CerDIP
Layout
Formed Leads Normal Normal Normal
Temperature Range
+70°C +70°C +70°C 25°C +85°C 25°C +85°C
ANALOG INPUT 0.01µF
ANALOG COMMON
TC7106/A TC7107/A
VREF
100mV ANALOG COMMON (PIN CONVERSIONS/SEC 200mV FULL SCALE
AVAILABLE PACKAGES
OSC2 OSC3 OSC1 COSC 100pF 100k
40-Pin Plastic
40-Pin CERDIP
Figure TC7106/A/7/A Typical Operating Circuit
44-Pin Plastic Quad Flat Package Formed Leads
TC7106/6A/7/7A-7 11/4/96
44-Pin Plastic Chip Carrier PLCC
TelCom Semiconductor reserves right make changes circuitry specifications devices.
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
ABSOLUTE MAXIMUM RATINGS* TC7106A
Supply Voltage Analog Input Voltage (either input) (Note Reference Input Voltage (either input) Clock Input Test Package Power Dissipation (Note 70°C) CerDIP .2.29W Plastic .1.23W PLCC .1.23W PQFP .1.00W Operating Temperature Devices +70°C Devices 25°C +85°C Storage Temperature 65°C +150°C Lead Temperature (Soldering, sec) 300°C Clock Input Power Dissipation (Note 70°C) 40-Pin CerDIP Package .2.29W 40-Pin Plastic 1.23W 44-Pin PLCC .1.23W 44-Pin PQFP 1.00W Operating Temperature Devices +70°C Devices 25°C +85°C Storage Temperature 65°C +150°C Lead Temperature (Soldering, sec) +300°C
*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.
TC7107A
Supply Voltage Analog Input Voltage (either input) (Note Reference Input Voltage (either input)
ELECTRICAL CHARACTERISTICS (Note
Parameters
Zero Input Reading Ratiometric Reading Roll-Over Error (Difference Reading Equal Positive Negative Reading Near Full-Scale) Linearity (Max. Deviation From Best Straight Line Fit) Common-Mode Rejection Ratio (Note Noise Value Exceeded Time) Leakage Current Input Zero Reading Drift
Test Conditions
Full-Scale 200.0mV VREF VREF 200mV
TC7106/A TC7107/A
000.0 ±000.0 999/1000 ±0.2 +000.0 1000
Unit
Digital Reading Digital Reading Counts
Scale Factor Temperature Coefficient
Supply Current (Does Include Current TC7107/A)
Full-Scale 200mV Full-Scale 2.000 ±1V, Full Scale 200.0 Full-Scale 200.0mV Device +70°C Device 25°C +85°C 199.0mV, Device +70°C (Ext. 0ppm°C) 199.0mV Device 25°C +85°C
±0.2
Counts µV/V µV/°C µV/°C ppm/°C ppm/°C
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
ELECTRICAL CHARACTERISTICS (Cont.) (Note
Parameters
Analog Common Voltage (With Respect Pos. Supply) Temp. Coeff. Analog Common (With Respect Pos. Supply) Temp. Coeff. Analog Common (With Respect Pos. Supply) TC7106A ONLY Segment Drive Voltage (Note TC7106A ONLY Backplane Drive Voltage (Note TC7107A ONLY Segment Sinking Current (Except TC7107A ONLY Segment Sinking Current (Pin
Test Conditions
Between Common Pos. Supply Between Common Pos. Supply +70°C ("C", Commercial Temp. Range Devices) Between Common Pos. Supply 25°C 85°C ("I," Industrial Temp. Range Devices) 5.0V Segment Voltage 5.0V Segment Voltage
TC7106/A TC7107/A
3.05 3.35
Unit
7106A/7A 7106/7
ppm/°C ppm/°C
ppm/°C
NOTES: Input voltages exceed supply voltages provided input current limited ±100µA. Dissipation rating assumes device mounted with leads soldered printed circuit board. Unless otherwise noted, specifications apply both TC7106/A TC7107/A 25°C, fCLOCK kHz. Parts tested circuit Figure Refer "Differential Input" discussion. Backplane drive phase with segment drive "OFF" segment, 180° phase "ON" segment. Frequency times conversion rate. Average component less than 50mV.
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
CONFIGURATIONS
NORMAL CONFIGURATION TEST VREF CREF CREF ANALOG COMMON VBUFF BP/GND (7106A/7107A)
REVERSE CONFIGURATION
10's 100's 1000's (MINUS SIGN)
TC7106ACPL TC7107AIPL
TEST VREF CREF CREF ANALOG COMMON
TC7106AIJL TC7107AIJL
10's
VBUFF
100's
100's
100's
1000's (MINUS SIGN)
BP/GND (7106A/7107A)
OSC1
OSC2
OSC3
CREF
CREF
BUFF
TEST
TC7106ACLW TC7107ACLW (PLCC)
CREF CREF COMMON BUFF
TEST OSC3 OSC2 OSC1
TC7106ACKW TC7107ACKW (FLAT PACKAGE)
BP/GND
BP/GND
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
DESCRIPTION
(Pin 40-Pin PDIP (Normal))
(Pin 40-Pin PDIP (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) (13) (12)
Symbol
VINT VBUFF
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 (TC7106A). Digital ground (TC7107A). Activates section hundreds display. Activates section hundreds display. Activates section hundreds display. Activates section tens display. Negative power supply voltage. Integrator output. Connection point integration capacitor. INTEGRATING CAPACITOR section more details Integration resistor connection. resistor 200mV fullscale range 470k resistor full-scale range. size auto-zero capacitor influences system noise. 0.47µF capacitor 200mV full scale, 0.047µF capacitor full scale. Paragraph AUTO-ZERO CAPACITOR more details. analog input connected this pin. analog HIGH input signal connected this pin. This primarily used analog common-mode voltage battery operation systems where input signal referenced power supply. also acts reference voltage source. paragraph ANALOG COMMON more details.
(11) (10)
ANALOG COMMON
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
DESCRIPTION (Cont.)
(Pin (Pin 40-Pin PDIP 40-Pin PDIP (Normal) (Reverse)
Symbol
Description
0.1µF capacitor used most applications. large commonmode 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 100mV between pins 199.9mV full-scale. Place between pins full scale. paragraph REFERENCE VOLTAGE. Lamp test. When pulled HIGH 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 section), connect junction 100k resistor 100pF capacitor. 100k resistor tied 100pF capacitor tied
VREF
Test
OSC3 OSC2 OSC1
General Theory Operation Dual Slope Conversion Principles
(All Designations Refer 40-Pin DIP)
TC7106A TC7107A dual slope, integrating analog-to-digital converters. understanding dual slope conversion technique will following detailed operation 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). Time 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). (Figure 2A). simple dual slope converter complete conversion requires integrator output "ramp-up" "rampdown." simple mathematical equation relates input signal, reference voltage integration time:
where: Reference Voltage Signal Integration Time (Fixed) Reference Voltage Integration Time (Variable) constant VIN:
ANALOG INPUT SIGNAL INTEGRATOR SWITCH DRIVER VOLTAGE PHASE CONTROL CONTROL LOGIC POLARITY CONTROL CLOCK INTEGRATOR OUTPUT DISPLAY VARIABLE REFERENCE INTEGRATE TIME FIXED SIGNAL INTEGRATE TIME
COMPARATOR
VFULL SCALE VFULL SCALE
VIN(t)dt VRTRI
Figure Basic Dual Slope Converter
COUNTER
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
dual slope converter accuracy unrelated integrating resistor capacitor values long they stable during measurement cycle. inherent benefit noise immunity. 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 50/60Hz power line period. (Figure
NORMAL MODE REJECTION (dB)
Signal Integrate Cycle
When auto-zero loop opened, internal differ+ ential inputs connect VIN. differential input signal integrated fixed time period. signal integration period 1000 counts. externally clock frequency divided four before clocking internal counters. integration time period where: fOSC External Clock Frequency differential input voltage must within device common-mode range either supply) 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. fOSC 1000
MEASUREMENT PERIOD 0.1/T INPUT FREQUENCY 10/T
Reference Integrate Cycle
final phase reference integrate de-integrate. 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 counts. digital reading displayed 1000 VREF
Figure Normal-Mode Rejection Dual Slope Converter
ANALOG SECTION
addition basic signal integrate deintegrate cycles discussed, circuit incorporates auto-zero cycle. This cycle removes buffer amplifier, integrator, comparator offset voltage error terms from conversion. true digital zero reading results without adjusting external potentiometers. complete conversion consists three cycles: auto-zero, signal-integrate reference-integrate cycle.
DIGITAL SECTION (TC7106A)
TC7106A (Figure contains segment drivers necessary directly drive 3-1/2 digit liquid crystal display (LCD). backplane driver included. backplane frequency external clock frequency divided 800. three conversions/second backplane frequency 60Hz with nominal amplitude. When segment driver phase with backplane signal segment "OFF." phase segment drive signal causes segment "ON" visible. This drive configuration results negligible voltage across each segment. This insures long display life. polarity segment driver "ON" negative analog inputs. reversed, this indicator will reverse.
Auto-Zero Cycle
During auto-zero cycle differential input signal disconnected from circuit opening internal analog gates. internal nodes shorted analog common (ground) establish zero-input condition. Additional analog gates close feedback loop around integrator comparator. This loop permits comparator offset voltage error compensation. voltage level established compensates device offset voltages. offset error referred input less than 10µV. auto-zero cycle length 1000 3000 counts.
TC7106 TC7106A TC7107 TC7107A
TYPICAL SEGMENT OUTPUT 0.5mA SEGMENT OUTPUT DISPLAY
TC7106A
INTERNAL DIGITAL GROUND RINT BUFF INTEGRATOR SEGMENT DECODE COMPARATOR
THOUSANDS HUNDREDS TENS UNITS
BACKPLANE
CREF VINT SEGMENT DECODE SEGMENT DRIVERS
CINT
VREF
VREF
SEGMENT DECODE
DIGITAL SECTION
DATA LATCH
Figure TC7106A Block Diagram
3.0V CLOCK TEMPCO VREF SWITCH DRIVERS FROM COMPARATOR OUTPUT fOSC ROSC COSC INTERNAL DIGITAL GOUND
6.2V CONTROL LOGIC
ANALOG COMMON
TEST
3-1/2 DIGIT CONVERTERS
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
When TEST TC7106A pulled segments turned "ON." display reads -1888. During this mode segments have constant voltage impressed. LEAVE DISPLAY THIS MODE MORE THAN SEVERAL MINUTES! displays destroyed operated with levels extended periods. display font segment drive assignment shown Figure
DISPLAY FONT
Signal Integrate: 1000 Counts (4000 Clock Pulses) This time period fixed. integration period 4000
fOSC
Where fOSC externally clock frequency. Reference Integrate: 2000 Counts 8000 Clock Pulses)
TC7106A/7107A drop-in replacements 7106/7107 parts. External component value changes required benefit from drift internal reference.
1000's
100's
10's
Clock Circuit
Three clocking methods used: external oscillator connected crystal between pins oscillator using three pins.
Figure Display Font Segment Assignment
TC7106A, internal digital ground generated from volt zener diode large channel source follower. This supply made stiff absorb large capacitive currents when backplane voltage switched.
COUNTER
CRYSTAL
DIGITAL SECTION (TC7107A)
Figure shows TC7107A. designed drive common anode LEDs. identical TC7106A except that regulated supply backplane drive have been eliminated segment drive typically 8mA. 1000's output (pin sinks current from segments, 16mA drive capability. both devices, polarity indication "ON" nega- tive analog inputs. reversed, this indication reversed also, desired. display font same TC7106A.
NETWORK TEST TSC7106A TSC7107A
TC7106A TC7107A
Figure Clock Circuits
COMPONENT VALUE SELECTION Auto-Zero Capacitor
capacitor size some influence system noise. 0.47µF capacitor recommended 200mV fullscale applications where 100µV. 0.047µF capacitor adequate 2.0V full-scale applications. mylar dielectric capacitor adequate.
System Timing
oscillator frequency divided prior clocking internal decade counters. three-phase measurement cycle takes total 4000 counts 16000 clock pulses. 4000 count cycle independent input signal magnitude. Each phase measurement cycle following length: Auto-Zero Phase: 1000 3000 Counts (4000 12000 Clock Pulses) signals less than full-scale, auto-zero phase assigned unused reference integrate time period.
Reference Voltage Capacitor CREF
reference voltage used ramp integrator output voltage back zero during reference-integrate cycle stored CREF. 0.1µF capacitor acceptable when tied analog common. large common-mode voltage exists (VREF analog common) application requires 200mV full-scale, increase CREF Rollover error will held less than count. mylar dielectric capacitor adequate.
TC7106 TC7106A TC7107 TC7107A
TYPICAL SEGMENT OUTPUT 0.5mA SEGMENT OUTPUT DISPLAY
TC7107A
INTERNAL DIGITAL GROUND
CREF VREF BUFF INTEGRATOR SEGMENT DECODE COMPARATOR
THOUSANDS HUNDREDS TENS
RINT VINT DIGITAL SECTION SEGMENT DECODE SEGMENT DRIVERS
CINT
VREF
SEGMENT DECODE
Figure TC7107A Block Diagram
DATA LATCH 3.0V CLOCK TEMPCO VREF fOSC SWITCH DRIVERS FROM COMPARATOR OUTPUT LOGIC CONTROL ROSC COSC DIGITAL GOUND
UNITS
ANALOG COMMON
TEST DIGITAL GROUND
3-1/2 DIGIT CONVERTERS
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
Integrating Capacitor CINT
CINT should selected maximize integrator output voltage swing without causing output saturation. TC7106A/7107A superior temperature coefficient specification, analog common will normally supply differential voltage reference. this case full-scale integrator output swing satisfactory. readings/ second (fOSC 48kHz) 0.22µF value suggested. different oscillator frequency used, CINT must changed inverse proportion maintain nominal integrator swing. exact expression CINT (4000) CINT RINT fOSC VINT Where: fOSC Clock frequency Full-scale input voltage RINT Integrating resistor VINT Desired full-scale integrator output swing CINT must have dielectric absorption minimize rollover error. polypropylene capacitor recommended.
Oscillator Components
ROSC (Pin should 100k. COSC selected using equation: fOSC 0.45
fOSC 48kHz, COSC 100pF nominally. Note that fOSC divided four generate TC7106A internal control clock. backplane drive signal derived dividing fOSC 800. achieve maximum rejection 60Hz noise pickup, signal-integrate period should multiple 60Hz. Oscillator frequencies 240kHz, 120kHz, 80kHz, 60kHz, 48kHz, 40kHz, etc. should selected. rejection, oscillator frequencies 200kHz, 100kHz, 2/3kHz, 50kHz, 40kHz, etc. would suitable. Note that 40kHz (2.5 readings/second) will reject both 50Hz 60Hz.
Reference Voltage Selection
full-scale reading (2000 counts) requires input signal twice reference voltage. Required Full-Scale Voltage*
200.0mV 2.000V
VREF
VREF
100.0mV 1.000V
Integrating Resistor RINT
input buffer amplifier integrator designed with class output stages. output stage idling current 100µA. integrator buffer supply 20µA drive currents with negligible linearity errors. RINT chosen remain output stage linear drive region large that printed circuit board leakage currents induce errors. 200mV full-scale, RINT 47k. 2.0V full-scale requires 470k. Component Value
RINT CINT
Note:1.
Nominal Full-Scale Voltage
200.0mV 0.47µF 0.22µF 2.000V 0.047µF 470k 0.22µF
fOSC 48kHz readings/sec)
some applications scale factor other than unity exist between transducer output voltage required digital reading. Assume, example, pressure transducer output 400mV 2000 lb/in2. Rather than dividing input voltage reference voltage should 200mV. This permits transducer input used directly. differential reference also used when 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. internal voltage reference potential available analog common will normally used supply converter's reference. This potential stable whenever supply potential greater than approximately applications where externally-generated reference voltage desired, refer Figure
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
VREF VREF 6.8k
INPUT BUFFER INTEGRATOR Where: 4000 INTEGRATION TIME
6.8V ZENER
TC7106A TC7107A
VREF VREF COMMON TC04 1.2V
TC7106A TC7107A
INTEGRATION CAPACITOR INTEGRATION RESISTOR
Figure Common-Mode Voltage Reduces Available Integrator Swing. (VCOM VIN)
Figure External Reference
Device Functional Description Differential Signal Inputs (Pin 31), (Pin 30))
TC7106A/7017A designed with true differential inputs accepts input signals within input stage common mode voltage range (VCM). typical range -1.0 Common-mode voltages removed from system when TC7106A/TC7107A operates from battery floating power source (isolated from measured system) connected analog common (VCOM): Figure systems where common-mode voltages exist, 86dB common-mode rejection ratio minimizes error. Common-mode voltages however, affect integrator output level. Integrator output saturation must prevented. worst-case condition exists large positive exists conjunction with full-scale negative differential signal. negative signal drives integrator output positive along with (Figure such applications integrator output swing reduced below recommended 2.0V full-scale swing. integrator output will swing within 0.3V without increasing linearity errors.
Differential Reference (Pin 36), VREF (Pin 35))
reference voltage generated anywhere within power supply range. prevent rollover errors from being induced large common-mode voltages, CREF should large compared stray node capacitance. TC7106A/TC7107A circuits have significantly lower analog common temperature coefficient. This gives very stable voltage suitable reference. temperature coefficient analog common 20ppm/°C typically.
SEGMENT DRIVE
DISPLAY
MEASURED SYSTEM
VBUF V+IN
VINT
OSC1 OSC3 OSC2
TC7106A ANALOG COMMON VREF VREF
POWER SOURCE
Figure Common-Mode Voltage Removed Battery Operation with Analog Common
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
Analog Common (Pin
analog common voltage potential approximately 3.0V below potential guaranteed between 2.7V 3.35 below Analog common tied internally channel capable sinking 20mA. This will hold common line 3.0V should external load attempt pull common line toward Analog common source current limited 10µA. Analog common therefore easily pulled more negative voltage (i.e., below 3.0V). TC7106A connects internal inputs analog common during auto-zero cycle. During reference-integrate phase, connected analog com- mon. externally connected analog common, common-mode voltage exists. This rejected converter's 86dB 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. TC7106A specifically designed operate from battery measurement system where input signals referenced (float) with respect TC7106A power source. analog common potential 3.0V gives battery life voltage. common potential 0.001%/% voltage coefficient output impedance. With sufficiently high total supply voltage 7.0V) analog common very stable potential with excellent temperature stability-typically 20ppm/°C. This potential used generate reference voltage. external voltage reference will unnecessary most cases because 50ppm/°C maximum temperature coefficient. Internal Voltage Reference discussion.
Internal Voltage Reference Stability
analog common voltage temperature stability been significantly improved (Figure 10). version industry standard circuits allow users upgrade systems design systems without external voltage references. External values need changed. Figure shows analog common supplying necessary voltage reference TC7106A/TC7107A.
TEMPERATURE COEFFICIENT (ppm/°C)
MAXIMUM SPECIFIED
MAXIMUM SPECIFIED TYPICAL
MAXIMUM LIMIT
MAXIMUM SPECIFIED TYPICAL
TYPICAL
7106A
ICL7106
ICL7136
Figure Analog Common Temperature Coefficient
TC7106A TC7107A
Test (Pin
TEST potential less than TEST used negative power supply connection external CMOS logic. TEST tied internally generated negative logic supply (Internal Logic Ground) through resistor TC7106A. TEST load should more than TEST pulled segments plus minus sign will activated. operate this mode more than several minutes with TC7106A. With TEST segments impressed with voltage which will destroy LCD. TEST will sink about 10mA when pulled
VREF VREF
VREF
ANALOG COMMON VREF VFULL SCALE
Figure Internal Voltage Reference Connection
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
POWER SUPPLIES
TC7107A designed work from supplies. However, negative supply available, generated from clock output with diodes, capacitors, inexpensive (Figure selected applications negative supply required. conditions single supply are: input signal referenced center common-mode range converter. signal less than ±1.5V. external reference used. TSC7660 converter used generate from (Figure 13).
CD4009 OSC1 OSC2 OSC3
TC7107 Power Dissipation Reduction
TC7107A sinks display current this causes heat build package. internal voltage reference used, changing chip temperature cause display change reading. reducing common anode voltage TC7107A package power dissipation reduced. Figure photograph curve-tracer display showing relationship between output current output voltage typical TC7107CPL. Since typical volts across 7mA, common anode connected +5V, TC7107A output 3.2V (point Figure 13). Maximum power dissipation 8.1mA 3.2V segments 622mW. Notice, however, that once TC7107A output voltage above volts, current essentially constant output voltage increases. Reducing output voltage 0.7V (point Figure results 7.7mA current, only percent reduction. Maximum power dissipation only 7.7mA 462mW, reduction 26%. output voltage reduction volt (point reduces current (7.3mA) power dissipation 38%! (7.3mA 2.2V 385mW).
0.047
1N914 1N914
TC7107A
-3.3V
Figure Generating Negative Supply From
VREF VREF
DRIVE TC7107A
Figure TC7107A Output Current Output Voltage
10µF TC7660 10µF
*3-1/2 DIGIT
Reduced power dissipation very easy obtain. Figure shows ways: either ohm, watt resistor diode placed series with display (but series with TC7107A). resistor will reduce TC7107A output voltage, when segments "ON," point Figure When segments turn off, output voltage will increase. diode, other hand, will result relatively steady output voltage, around point "B."
Figure Negative Power Supply Generation with TC7660
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
addition limiting maximum power dissipation, resistor reduces change power dissipation display changes. This effect caused fact that, fewer segments "ON," each "ON" output drops more voltage current. best case segments "111" display) worst case "1888" display) resistor will change about 230mW, while circuit without resistor will change about 470mW. Therefore, resistor will reduce effect display dissipation reference voltage drift about 50%. change brightness caused resistor almost unnoticeable more segments turn off. display brightness remaining steady very important designer, diode used instead resistor.
APPLICATIONS INFORMATION Liquid Crystal Display Sources
Several manufacturers supply standard displays interface with TC7106A 3-1/2 digit analog-todigital converter. Manufacturer
Crystaloid Electronics
Address/Phone
5282 Hudson Hudson, 44236 216/655-2429 Palomar Ave. Sunnyvale, 94086 408/523-8200 3415 Kashikawa Torrance, 90505 213/534-0360 Lake Lake Mills, 53551 414/648-2361
Part Numbers1
C5335, H5535, T5135, SX440 0201,0701 0203, 2201 0501 LD-B709BZ LD-H7992AZ 3902, 3933, 3903
Epson
0.47
Hamlin, Inc.
0.01
0.22
DISPLAY
Note: Contact manufacturer full product listing/specifications.
Light Emitting Diode Display Sources
TC7107A
Several manufacturers supply seven segment digits with without decimal point annunciators TC7107A. Manufacturer Address
Page Mill Palo Alto, 94304 Palomar Ave. Sunnyvale, 94086
Display Type
DISPLAY
1/4W 1N4001
Hewlett-Packard Components
Figure Diode Resistor Limits Package Power Dissipation
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
Decimal Point Annunciator Drive
TEST connected internally-generated digital logic supply ground through resistor. TEST used negative supply external CMOS gate segment drivers. display annunciators decimal points, battery indication, function indication added without adding additional supply. more than should supplied TEST pin: potential approximately below
4049
Ratiometric Resistance Measurements
true differential input differential reference make ratiometric reading possible. Typically 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 Unknown Standard 1000
TC7106A
BACKPLANE DECIMAL POINT
display will overrange Unknown standard.
TEST
RSTANDARD
VREF
DISPLAY TC7106A
RUNKNOWN
TC7106A
DECIMAL POINT SELECT
DECIMAL POINTS
ANALOG COMMON
Figure Parts Count Ratiometric Resistance Measurement
TEST
4030
Figure Decimal Point Drive Using TEST Logic Ground
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
IN4148 200mV 0.02 6.8µF
AD636
TC7106A
0.01 ANALOG COMMON
900k
20kW 3-10pF VARIABLE, 132pF VARIABLE
2.2µF
DRIVE
DISPLAY
Figure Digit True
5.6k 160k 0.7%/°C VREF VREF COMMON
160k
300k
300k
VREF VREF COMMON
1N914
TC7106A
1N4148 SENSOR
TC7106A
Figure Temperature Sensor
Figure Positive Temperature Coefficient Resistor Temperature Sensor
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
CONSTANT TEMP 5.1k
REF02
VOUT
TC911
VOUT 1.86V 25°C
TC7106A
2.00V
TEMPERATURE DEPENDENT OUTPUT
1.3k
Figure Integrated Circuit Temperature Sensor
VREF 100mV
100k 100pF
0.1µF
TC7106A
0.01µF
0.47µF 0.22µF
DISPLAY BACKPLANE
Figure TC7106A Using Internal Reference: 200mV FullScale, Readings-per-second (RPS).
COMMON
TC7107A
VREF 100mV
100k 100pF 0.1µF
0.01µF
0.47µF 0.22µF
DISPLAY
Figure TC7107A Internal Reference (200mV Full-Scale, 3RPS, Tied Single Ended Inputs).
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
LOGIC
LOGIC
TC7106A
TC7106A TC7107A
CD4023 74C10 CD4077 OVERRANGE UNDERRANGE
VREF
100k 100pF
0.1µF
0.01µF
0.047µF
470k
0.22µF
DISPLAY
Figure Circuit Developing Underrange Overrange Signals from TC7106A Outputs.
Figure TC7106A/TC7107A: Recommended Component Values 2.00V Full-Scale
100k
100pF
TC7107A
VREF 100mV
TC04 1.2V
0.1µF
0.01µF
0.47µF 0.22µF
TC7107A
DISPLAY
100k
100pF
VREF 100mV
TC04 1.2V
0.1µF
0.01µF
0.47µF 0.22µF
DISPLAY
Figure TC7107A With 1.2V External Band-Gap Reference. (VIN Tied Common.)
Figure TC7107A Operated from Single Supply. External Reference Must Used This Application.
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
PACKAGE DIMENSIONS 40-Pin CerDIP
.540 (13.72) .510 (12.95)
.098 (2.49) MAX. 2.070 (52.58) 2.030 (51.56) .210 (5.33) .170 (4.32) .200 (5.08) .125 (3.18)
.030 (0.76) MIN. .620 (15.75) .590 (15.00) .060 (1.52) .020 (0.51) .015 (0.38) .008 (0.20) .700 (17.78) .620 (15.75)
.150 (3.81) MIN.
3°MIN.
.110 (2.79) .090 (2.29)
.065 (1.65) .045 (1.14)
.020 (0.51) .016 (0.41)
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)
Dimensions: inches (mm)
3-1/2 DIGIT CONVERTERS TC7106 TC7106A TC7107 TC7107A
PACKAGE DIMENSIONS (Cont.) 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)
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: 415-968-9241 FAX: 415-967-1590 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.

TC7106 TC7106 TC7106A TC7106A TC7107 TC7107 TC7107A TC7107A 3-1/2

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