3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS Accuracy ±0.05% Reading

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3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS Accuracy ±0.05% Reading

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3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC14433 TC14433 TC14433A TC14433A
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS
Accuracy ±0.05% Reading Count Voltage Ranges .1.999V 199.9 Conversions Second 1000M Ohms Single Positive Voltage Reference Auto-Polarity Auto-Zero Overrange Underrange Signals Available Operates Auto-Ranging Circuits Uses On-Chip System Clock External Clock Wide Supply Range e.g., ±4.5V Available 24-Pin DIP, 24-Pin CerDIP, 28-Pin SOIC 28-Pin PLCC
GENERAL DESCRIPTION
TC14433 power, high-performance, monolithic CMOS 3-1/2 digit converter. TC14433 combines both analog digital circuits single thus minimizing number external components. This dualslope converter provides automatic polarity zero correction with addition external resistors capacitors. full-scale voltage range this ratiometric extends from 199.9 millivolts 1.999 volts. TC14433 operate over wide range power supply voltages, including batteries standard 5-volt supplies. TC14433 will interface with TC7211A display driver. TC14433A features improved performance over industry standard TC14433. Rollover, which measurement identical positive negative signals, guaranteed have same reading within count TC14433A. Power consumption TC14433A typically approximately one-half that industry standard TC14433.
APPLICATIONS
Portable Instruments Digital Voltmeters Digital Panel Meters Digital Scales Digital Thermometers Remote Sensing Systems Systems Application Notes
ORDERING INFORMATION
Part TC14433AEJG TC14433AELI TC14433AEPG TC14433COG TC14433EJG TC14433ELI TC14433EPG
20-23 MULTIPLEXER
Package 24-Pin CerDIP 28-Pin PLCC 24-Pin Plastic 24-Pin SOIC 24-Pin CerDIP 28-Pin PLCC 24-Pin Plastic
Temperature Range 40°C +85°C 40°C +85°C 40°C +85°C +70°C 40°C +85°C 40°C +85°C 40°C +85°C
FUNCTIONAL BLOCK DIAGRAM
DATA DIGIT STROBE
CLK1 CLK0 CLOCK
16-19
LATCHES
POLARITY DETECT
10'S
100'S
1,000'S
OVERFLOW OFFSET
OVERRANGE
CONTROL LOGIC DISPLAY UPDATE CONVERSION
TC14433/A-6 10/21/96
CMOS ANALOG SUBSYSTEM
VREF REFERENCE VOLTAGE ANALOG GROUND ANALOG INPUT
INTEGRATOR
TelCom Semiconductor reserves right make changes circuitry specifications devices.
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC14433 TC14433A
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage (VDD VEE) 0.5V +18V Voltage Pin, Reference 0.5V (VDD 0.5) Current, ±10mA Operating Temperature Range 40°C +85°C Power Dissipation 70°C) Plastic PLCC .1.0W Plastic .940mW SOIC 940mW CerDIP .1.45W Storage Temperature Range 65°C +160°C Lead Temperature (Soldering, sec) +300°C
*This stress rating only functional operation device these other conditions above those indicated operation sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS: +5V, 0.1µF (mylar), 0.1µF, 300k,
470k VREF VREF 200mV, unless otherwise specified.
Symbol Parameter Analog Input
Rollover Error (Positive Negative Full Scale Symmetry Linearity Output Reading (Note Stability Output Reading (Note Zero Output Reading Bias Current: Analog Input Reference Input Analog Ground Common-Mode Rejection
Test Conditions
200mV Full Scale -VIN +VIN VREF VREF 200mV 1.99V, VREF 199mV, VREF 200mV VREF
+25°C
40°C +85°C
Unit
Counts
0.05 count
+0.05
+0.05 count ±100 ±100 ±500
%rdg
CMRR
1.4V, VREF 32kHz Level Level Level Level 4.6V Source Source 0.4V Sink 4.5V Sink 300k
Digital
fCLK Output Voltage Pins (Note Output Voltage Pins (Note Output Current Pins Output Current Pins Clock Frequency Input Current Quiescent Current 4.95 4.95 0.51 0.36 0.88 2.25 ±0.00001 0.05 -4.95 ±0.3 4.95 4.95 0.14 0.35 0.36 0.05 4.95
Power
VEE, 14433A: VEE, 14433: VEE, VREF
PSRR
Supply Rejection
mV/V
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC14433 TC14433A
NOTES: Accuracy accuracy meter full-scale accuracy setting reference voltage. Zero recalculated during each conversion cycle. meaningful specification linearity. other words, deviation from correct reading inputs other than positive full-scale zero defined linearity specification. stability 200mV scale defined range that will occupy time. numbers refer 24-pin DIP.
CONFIGURATIONS
VREF R1/C1
VREF R1/C1 CLK1 CLK0
TC14433COG (SOIC)
TC14433AEPG TC14433EPG TC14433AEJG TC14433EJG (PDIP)
(CerDIP)
CLK1 CLK0
VREF
R1/C1
TC14433AELI TC14433ELI (PLCC)
CLK1
CLK0
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC14433 TC14433A
DESCRIPTIONS
24-Pin 24-Pin PDIP/CerDip SOIC
28-Pin PLCC
Symbol
Description
This analog ground; high input impedance This determines reference level unknown input voltage (VX) reference voltage (VREF). Reference voltage Full-scale output equal voltage applied VREF. Therefore, full-scale voltage 1.999V requires reference 199.9 full-scale requires reference. VREF functions system reset also. When switched VEE, system reset beginning conversion cycle. unknown input voltage (VX) measured ratio reference voltage (VREF) ratiometric conversion. These pins external components used integration function dual slope conversion. Typical values (mylar) capacitor (resistor) full-scale. (resistor) full-scale. Clock frequency gives msec conversion time. equation below calculation integrator component values. These pins used connecting offset correction capacitor. recommended value Display update input When connected output every conversion displayed. data will strobed into output latches during conversion cycle positive edge received prior ramp-down cycle. When this driven from external source, voltage should referenced VSS. Clock input pins TC14433 oscillator system clock. Connecting single resistor between CLK1 CLK0 sets clock frequency. crystal circuit inserted lieu resistor improved CLK1, clock input, driven from external clock source, which need only have standard CMOS output drive. This referenced external clock inputs. resistor yields clock frequency about kHz. (See typical characteristic curves; Figure alternate circuits.) Negative power current Connection most negative supply. Please note current output drive circuit returned through VSS. Typical supply current Negative power supply output circuitry This sets voltage level output pins (BCD, Digit Selects, EOC, OR). When connected analog ground, output voltage from analog ground VDD. connected VEE, output swing from VDD. recommended operating range between volts VEE. conversion output generates pulse each conversion cycle. This generated pulse width equal one-half period system clock. Overrange Normally this high. When exceeds VREF low.
VREF
R1/C1
CLK1 CLK0
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC14433 TC14433A
DESCRIPTIONS (Cont.)
24-Pin 24-Pin PDIP/CerDip SOIC
28-Pin PLCC
8,15,
Symbol
Description
Digit select pins digit select output goes high when respective digit selected. (1/2 digit) turns immediately after pulse. remaining digits turn sequence from LSD. ensure that data settled, inter-digit blanking time clock periods included. Clock frequency divided equals multiplex rate. example, system clock gives multiplex rate kHz. Figure digit select timing diagram. data output pins Multiplexed outputs contain three full digits information during digit select DS2, DS3, DS4. During DS1, digit, overrange, underrange polarity information available. Refer truth table. Positive power supply This most positive power supply pin. Used.
CIRCUIT DESCRIPTION
TC14433 CMOS becomes modified dualslope with minimum external components. This customary CMOS digital logic circuitry, well CMOS analog circuitry. provides user with digital functions (such counters, latches, multiplexers) analog functions (such operational amplifiers comparators) single chip. Features this system include auto-zero, high input impedances auto-polarity. power consumption wide range power supply voltages also advantages this CMOS device. system's auto-zero function compensates offset voltage internal amplifiers comparators. this "ratiometric system," output reading ratio unknown voltage reference voltage, where ratio equal maximum count 1999. takes approximately 16,000 clock periods complete conversion cycle. Each conversion cycle divided into segments. Figure shows conversion cycle segments both positive negative inputs. Segment offset capacitor (CO), which compensates input offset voltages buffer integrator amplifiers, charged during this period. However, integrator capacitor shorted. This segment requires 4000 clock periods. Segment During this segment, integrator output decreases comparator threshold voltage. this time, number counts equivalent input offset voltage comparator stored offset latches
later auto-zero process. time this segment variable less than clock periods.
START TIME SEGMENT NUMBER TYPICAL POSITIVE INPUT VOLTAGE TYPICAL NEGATIVE INPUT VOLTAGE
Figure Integrator Waveforms
BUFFER
INTEGRATOR
COMPARATOR
Figure Equivalent Circuit Diagrams Analog Section During Segment Timing Cycle
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC14433 TC14433A
Crystal Oscillator Circuit
CLK1
Oscillator Circuit
CLK1
TC14433
2/LC
TC14433
0.01
Figure Alternate Oscillator Circuits
Segment This segment conversion cycle same Segment Segment Segment up-going ramp cycle with unknown input voltage (VX) input integrator. Figure shows equivalent configuration analog section TC14433. actual configuration analog section dependent upon polarity input voltage during previous conversion cycle. Segment This segment down-going ramp
period with reference voltage input integrator. Segment conversion cycle time equal number counts stored offset storage latches during Segment result, system zeros automatically. Segment This extension Segment time period this portion 4000 clock periods. results conversion cycle determined this portion conversion cycle.
TC04
300k 0.1µF TC14433
SEGMENT RESISTORS MINUS SIGN MPS-A12 PLUS SIGN COMMON ANODE DISPLAY MPS-A12
µF**
4543B
1413
14013B
470k RANGE 200mV RANGE **MYLAR CAPACITOR
Figure 3-1/2 Digit Voltmeter Common-Anode Displays, Flashing Overrange
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC14433 TC14433A
470k 14024B
TC04
TC14433 VREF 300k 14070B
14013B
14070B DIGIT
14013B
PLUS SIGN 14070B MINUS SIGN
14543B
14543B
14543B
Figure 3-1/2 Digit Voltmeter with Display
CLOCK CYCLE
16,400 CLOCK CYCLES
BETWEEN PULSES
DIGIT (MSD) CLOCK CYCLES
CLOCK CYCLES
(LSD)
Figure Digit Select Timing Diagram
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC14433 TC14433A
APPLICATIONS INFORMATION
Figure example 3-1/2 digit voltmeter using TC14433 with common-anode displays. This system requires 2.5V reference. Full-scale adjusted 1.999V 199.9 Input overrange indicated flashing display. This display uses LEDs with common anode digit lines. Power supply this system shown dual supply; however, TC14433 will operate over wide voltage range (see recommended operating conditions, page circuit Figure shows 3-1/2 digit voltmeter. 14024B provides frequency square wave signal drive backplane. Dual power supplies shown here; however, supply used when connected VEE. this case, must least 2.8V above VEE. When only segments decoder connected digit display, appear overrange indication occurs when count greater than 1999; e.g., 1.999V reference underrange indication, useful autoranging circuits, occurs when count less than 180; e.g., 0.180V reference Figure example 3-1/2 digit voltmeter with minimum external components (only additional components). this circuit, 14511B provides segment drive 75492 1413 provides sink digit current. Display blanked during overrange condition. TRUTH TABLE Coded Condition 7-Segment Decoding
Blank Blank Blank Blank Hook only segments
NOTES: digit, "1", high Polarity: positive, negative range condition exists When used conjunction with type range condition indicated; i.e.,
CAUTION most significant digit connected display other than only, such full digit display, segments other than must disconnected. 7-segment decoder must blank inputs 1010 1111.
MULTIPLEXED
14042B
14042B 14175B
14042B 14175B
14042B 14175B
14175B
Figure Demultiplexing TC14433 Data
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC14433 TC14433A
470k 0.1µF 0.1µF
TC04
INPUT
100k
R1/C CLK1 CLK0 TC14433 VREF
300k
RESISTOR NETWORK INDIVIDUAL RESISTOR* I4511B VDDg
VREF 2000V 1.999V full scale VREF 199.9 full scale (change 470k decimal point position) Peak digit current eight displayed times segment current. increase segment current capability 75491 between 14511B Resistor Network. 1413 digit driver increases digit current capability over 75492. range between -2.8 -11V.
VEE** (MINUS)
MINUS CONTROL 75492 1413* DIGIT DRIVERS
COMMON CATHODE DISPLAY
ALTERNATE OVERRANGE CIRCUIT WITH SEPARATED 75492 1413
Figure 3-1/2 Digit Voltmeter with Component Count Using Common Cathode Displays
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC14433 TC14433A
TYPICAL CHARACTERISTICS
ROLLOVER ERROR LSD) FULL-SCALE (PLUS COUNT LESS MINUS COUNT) QUIESCENT CURRENT (mA)
I-IV SUPPLY VOLTAGE SKEW NOTE: ROLLOVER ERROR DIFFERENCE OUTPUT READING SAME ANALOG INPUT SWITCHED FROM POSITIVE NEGATIVE.
TEMPERATURE (°C)
Figure Typical Rollover Error Power Supply Skew
Figure Typical Quiescent Power Supply Current Temp.
SINK CURRENT (mA)
DRAIN SOURCE VOLTAGE (Vdc) -40°C +25°C +85°C
SINK CURRENT (mA)
-40°C -25°C -85°C
DRAIN SOURCE VOLTAGE (Vdc)
Figure Typical N-Channel Sink Current -VSS Volts
ICLK CLOCK FREQUENCY CHANGE)
Figure Typical P-Channel Source Current -VSS Volts
TEMPERATURE (°C) NORMALIZED 25°C SUPPLY
CLOCK FREQUENCY (Hz)
SUPPLY
NOTE: TYPICAL VARIATION OVER SUPPLY VOLTAGES RANGE ±4.5V ±8V.
100k
CLOCK FREQUENCY RESISTOR
Figure Typical Clock Frequency Resistor (RC)
Figure Typical Change Clock Frequency Temperature
CONVERSION RATE CLOCK FREQUENCY ±1.5% 16,400 MULTIPLEX RATE CLOCK FREQUENCY
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC14433 TC14433A
PACKAGE DIMENSIONS 24-Pin Plastic
.555 (14.10) .530 (13.46)
1.270 (32.26) 1.240 (31.50)
.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)
MIN.
.110 (2.79) .090 (2.29)
.070 (1.78) .045 (1.14)
.022 (0.56) .015 (0.38)
24-Pin CerDIP
.540 (13.72) .510 (12.95)
.098 (2.49) 1.270 (32.26) 1.240 (31.50) .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) 3°MIN.
.150 (3.81) MIN.
.110 (2.79) .090 (2.29)
.065 (1.65) .045 (1.14)
.020 (0.51) .016 (0.41)
Dimensions: inches (mm)
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC14433 TC14433A
PACKAGE DIMENSIONS (Cont.) 24-Pin SOIC
.299 (7.59) .419 (10.65) .290 (740) .394 (10.10)
.615 (15.62) .597 (15.16) .104 (2.64) .097 (2.46) .012 (0.30) .004 (0.10)
MAX. .050 (1.27) .015 (0.40)
.013 (0.33) .009 (0.23)
.050 (1.27) TYP. .019 (0.48) .014 (0.36)
28-Pin PLCC
.495 (12.58) .485 (12.32) .456 (11.58) .450 (11.32)
.050 (1.27) TYP.
.021 (0.53) .013 (0.33) .032 (0.81) .026 (0.66) .430 (10.92) .390 (9.91)
.456 (11.58) .450 (11.43) .495 (12.58) .485 (11.43)
.020 (0.51) MIN. .120 (3.05) .090 (2.29) .180 (4.57) .165 (4.19) 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.

3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS Accuracy ±0.05% Reading

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