3 1 2 digit lcd display datasheet manufacturer

Text: typical power of 16mW. Packages include a 44-pin Flat Package. ES5120 3 3 /4 DIGIT A , , 5 KHz and 2.5KHz, for choice) Peak Reading Hold with LCD Annunciator 3 3 /4 Digit (3999 Maximum , significant digit (MSD) 2 41 AGD4 LCD segment drive for"a","g",and"d"segments of MSD 3 42 , 3 /4 DIGIT A/D CONVERTER Pin No. Pin No. ( 44-pin Flat Package) Package) Symbol , Logic "" DGND Logic "" V+ ES5120 3 3 /4 DIGIT A/D CONVERTER 10.5 LCD Display The ES5120

Abstract: Crystaloid Electronics logic probe QRT-38-40 7106 LCD driver TCB20 TC820CKW signal detection circuit "peak hold" constant vol 4 Digit counter D-82152

Text: Digit Display with Overrange Indicator ■LCD Display Driver with Built-in Contrast Control ■Data , 3-3/4 Digits lcd i logic highl 1qverrangê1 ipkholdl ilow batt - , Ž annunciator drive clock triple lcd oscillator drivers A 3-3/4 digit a/d converter analog gnd -N , . Fabricated in low-power CMOS, the TC820 directly drives a 3-3/4 digit (3999 maximum) LCD . With a maximum , DESCRIPTION Pin No. Pin No. ( 44-Pin Flat Package) Package) Symbol Description 1 40 L-E4 LCD segment

Text: With LCD Annunciator 3-3/4 Digit (3999 Maximum) Resolution (TC820) 3-1/2 Digit (1999 Maximum , OSCILLATOR TRIPLE LCD DRIVERS 1A 3-3/4 DIGIT A/D CONVERTER t N r V zs: LOW BATTERY DETECT , directly drives a 3-3/4 digit (3999 maximum) LCD . The TC821 includes all features of the TC820, but with a , > - Vs*-1.5 - PIN DESCRIPTION Pin No. ( 3 4 5 6 7 8 9 10 11 12 13 14 15 - , Description LCD segment driver for L ("logic low"), polarity, and "e" segment of most significant digit (MSD

Text: ■Logic Probe: — Two LCD Annunciators — Buzzer Driver ■3-3/4 Digit Display with , 3-3/4 Digits LCD I LOGIC HIGH! I , AGD4 LCD segment drive for "a," "g," and "d" segments of MSD. 3 42 BC4P3 LCD segment drive for "b" and "c" segments of MSD and decimal point 3 . 4 43 44 HFE3 LCD segment drive , and "e" segments of second LSD. 8 3 AGD2 LCD segment drive for "a," "g," and "d" segments

Text: 3 -1/2 digit liquid crystal display ( LCD ). An LCD backplane driver is included. The backplane , DIP 3 O SC i 381C q S C LvW , /2 DIGIT A/D CONVERTERS TC7106 TC7106A TC7107 TC7107A ELECTRICAL CHARACTERISTICS (Cont.) (Note 3 , TC7106 TC7106A TC7107 TC7107A PIN DESCRIPTION Pin No. 3 4 5 6 7 8 9 10 11 12 , 3-1/2 DIGIT A/D CONVERTERS TC7106 TC7106A TC7107 TC7107A PIN DESCRIPTION (Cont.) Pin No.

Text: necessary to directly drive a 3-1/2 digit LCD . An LCD backplane driver is included. The backplane frequency , C2 = 132 pF, VARIABLE 40 38 V­ 39 BP LCD Figure 11. 3-1/2 Digit True RMS AC DMM 28 , 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126 TC7126A TC7126A 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS FEATURES GENERAL DESCRIPTION s The TC7126A is a 3-1/2 digit CMOS , measurement system. Seven-segment decoders, digit and polarity drivers, voltage reference, and clock circuit

Abstract: TD036THEA1 Altera DE2 Board Using Cyclone II FPGA Circuit de2 video image processing altera Altera DE1 Board Using Cyclone II FPGA Circuit altera de2 960x240 specifications tv pattern generator altera de2 board Toppoly

Text: package includes: 1. The TRDB_LCM board. 2. An 3 . A reference design , DIN3 Input LCD data bus bit 3 27 DIN0 Input LCD data bus bit 0 28 DIN1 Input , . 3 CHAPTER 2 TRDB_LCM , . 5 2-3 PIN DESCRIPTION OF THE 3 DIGITAL PANEL DESIGN DEMONSTRATION

Abstract: IC 4049 Theory analog panel meter lcd 3902 LCD Panel Display Signal Theory 13-pin 4 digits 7-segment led display CMOS 4049 internal circuit three and half digit 7 SEGMENT LCD DISPLAY TC7126 TC7126ACKW

Text: Microchip Technology Inc. DS21458A 3 TC7126/A-8 11/6/96 3-1/2 Digit Analog -to- Digital Converters TC7126 TC7126A PIN DESCRIPTION Pin No. 3 4 , all the segment drivers necessary to directly drive a 3-1/2 digit LCD . An LCD backplane driver is , 3 . TC7126A Block Diagram TC7126/A-8 11/6/96 3-1/2 Digit Analog -to- Digital Converters , C2 V+ 12 AD636 4 900 k 1 LCD Figure 11. 3-1/2 Digit True RMS AC DMM TC7126/A

Text: ) 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126A PIN DESCRIPTION Pin No. digit LCD . An LCD backplane driver is included. The backplane frequency , , VARIABLE C2 = 132 pF, VARIABLE 40 38 V­ 39 BP LCD Figure 11. 3-1/2 Digit True RMS AC DMM , 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS TC7126 TC7126 TC7126A TC7126A 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS FEATURES GENERAL DESCRIPTION s The TC7126A is a 3-1/2 digit CMOS

Abstract: ultrasonic transducer 40khz logic probe 3 Digit counter diagram piezoelectric transducer 40khz 4 DIGIT LCD DISPLAY 40 PIN 9v buzzer CI 4001 ultrasonic piezoelectric transducer driver 4 Digit counter

Text: LCD Annunciators - Buzzer Driver s 3-3/4 Digit Display with Overrange Indicator s LCD Display , Input s 44-Pin Plastic Flat Pack or PLCC or TC820 is a 3-3/4 digit , 3-3/4 DIGIT A/D CONVERTER TRIPLE LCD DRIVERS DECIMAL POINT DRIVERS PEAK HOLD COMPARATOR , digit (3999 maximum) LCD . With a maximum range of 3999 counts, the TC820 provides 10 times greater , segment of most significant digit (MSD). LCD segment drive for "a," "g," and "d" segments of MSD. LCD

Abstract: ultra sonic sensor 40khz TC820-based 3 Digit counter diagram TC820CKW 40KHz Ultrasonic pair ultra sonic sensor interfacing with microcontroller TC820CPL Microcontroller AT89s52 connections with lcd piezoelectric buzzer

Text: Four Decade Range s Logic Probe: - Two LCD Annunciators - Buzzer Driver s 3-3/4 Digit Display , Leadless Chip Carrier LCD , DIFFERENTIAL REFERENCE CLOCK OSCILLATOR 3-3/4 DIGIT A/D CONVERTER TRIPLE LCD DRIVERS DECIMAL , . Fabricated in low-power CMOS, the TC820 directly drives a 3-3/4 digit (3999 maximum) LCD . With a maximum , "), polarity, and "e" segment of most significant digit (MSD). LCD segment drive for "a," "g," and "d"

Text: LCD LCD LCD LCD LCD LCD LCD LCD LED LED LED LED LED LED LED LED LED LED LED LED 3-1/2 DIGIT , DESCRIPTION 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 60 , /2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD TC7116 TC7116A TC7117 TC7117A 1 Figure 3 , WTELEDYNE COMPONENTS TC7116 TC7116A TC7117 TC7117A 1 3-1/2 DIGIT ANALOG-TO-DIGITAL , Directly Drives LCD or LED Display Guaranteed Zero Reading With Zero Input Low Noise for Stable D is p la y

Text: Auto-ranging Over Four Decade Range s Logic Probe: - Two LCD Annunciators - Buzzer Driver s 3-3/4 Digit , 3-3/4 digit (3999 maximum) LCD . With a maximum range of 3999 counts, the TC820 provides 10 times , significant digit (MSD). LCD segment drive for "a," "g," and "d" segments of MSD. LCD segment drive for "b" and "c" segments of MSD and decimal point 3 . LCD segment drive for H ("logic HIGH"), and "f" and "e" , . LCD segment drive for "b" and "c" segments of LSD and "low battery." LCD backplane # 3 . LCD backplane

Text: Counter 4-1/2 DIGIT LCD Vref rrm 116151412 5 3 4 CD4054A 7 8 13 1110 9 2 6 0.1 pF . 28 , TC7211A TC7212A 4- DIGIT CMOS DISPLAY DECODER/DRIVER FEATURES GENERAL DESCRIPTION TC7211A( LCD DRIVER) ■4- Digit Nonmultiplexed, 7-Segment LCD Outputs With Backplane Driver ■RC Oscillator On , ( LCD Decoder/Driver) and TC7212A(LED Decoder/Driver) is a direct drive, 4- digit , 7-segmerrt display , TELEDYNE COMPONENTS 3hE D ■ÔT17tiD2 OGOTblS 3 * T S C 4- DIGIT CMOS DISPLAY DECODER/DRIVER

Text: 39 BP SEG DRIVE LCD DISPLAY Figure 18. 3 1/2 Digit True RMS AC DMM + 160k 300k , Technology Inc. DS21455A 3 TC7106/6A/7/7A-7 11/4/96 3-1/2 Digit A/D Converters TC7106, digit liquid crystal display ( LCD ). An LCD backplane driver is included. The backplane frequency is , 3-1/2 Digit A/D Converters TC7106 TC7106A TC7107 TC7107A PACKAGE DIMENSIONS 3 ° MIN. .700 (17.78) .620 (15.75) .020 (0.51) .016 (0.41)

Abstract: T3D 29 zener DIODE ZENER DIODE T3D T3D zener DIODE T3D 29 diode zener t3d 21 T3D 31 zener DIODE T3D 19 zener DIODE diode zener t3d 23 diode zener t3d 36 T3D 35 zener DIODE

Text: Decade Range Logic Probe: - Two LCD Annunciators - Buzzer Driver 3-3/4 Digit Display with Overrange , T I T b O S DODTBfib flTQ 3 -1 4 9 3-3/4 DIGIT A/D CONVERTER WITH FREQUENCY AND LOGIC PROBE , drives a 3-3/4 digit (3999 maximum) LCD . With a maximum range of 3999 counts, the TC820 provides 10 times , DESCRIPTION Pin No. ( 3 4 5 6 7 8 9 10 11 12 13 14 15 -16 17 Pin No. (44-Pin Flat , "), polarity, and "e" segm ent ot most significant digit (MSD). LCD segm ent drive for "a," "g," and

Abstract: seven segment quad digit display using IC 7107 DIAGRAM OF IC 7106 tsc7660 the pin function of ic 7107 tsc7106 TSC* 7107 data sheet IC 7106 ic 7106 cpl tsc7107

Text: 50mV. 3 3-1/2 DIGIT A/D CONVERTERS TC7106 TC7106A TC7107 TC7107A PIN CONFIGURATIONS V , drivers necessary to directly drive a 3-1/2 digit liquid crystal display ( LCD ). An LCD backplane driver , LCD SEGMENT DRIVERS LED DISPLAY 21 1 DIGITAL GROUND V+ 3-1/2 DIGIT A/D CONVERTERS , 30 VIN 21 GND 26 2 5 4 (­5 V) TC7660*3-1/2 DIGIT ADC 3 + 10µF Figure 13 , 2 10k 9M 26 V­ ­ V­ 38 39 BP SEG DRIVE LCD DISPLAY Figure 18. 3 1/2

Abstract: IC counter 3 digit LED 16 pin 5 digit LCD display Rockwell 10941 segment driver ROCKWELL 10941 voltage display ic 30 PIN vacuum fluorescent display 4 digit 7 segment lcd display pin configuration 5 digit 7 segment LCD 28pin ic 5007

Text: /Latch Decoder & Driver M IC 4807 Protected A dd res sable Low Side Driver M IC 5002 4 Digit C ounter Decoder M IC 5005 4 Digit C ounter Decoder M IC 5007 4 Digit C ounter Decoder M IC 50395 6 Decade Counter , Dichroic LCD Driver M IC 80 11 Dichroic LCD Driver M IC 8012 D ichroic LC D Driver W ith Sw itching R egulator M IC 8013 Dichroic LCD Driver M IC 8014 D ichroic LCD Driver M IC 8030 50V LCD Driver MIC8031 100V , "Latched Dri ver" Section. 28-pin DIP 24-pin PDIP 16-pin PDIP

Text: SEG DRIVE BP LCD DISPLAY Figure 18. 3 1/2 Digit True RMS AC DMM + 9V + 5.6k 160k R1 , . Average DC component is less than 50mV. 3 3-1/2 DIGIT A/D CONVERTERS TC7106 TC7106A TC7107 TC7107A, (Pin No. 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 , 3-1/2 digit liquid crystal display ( LCD ). An LCD backplane driver is included. The backplane frequency , 31 VIN VIN ­ 30 VIN 21 GND V 8 + 10µF 2 5 4 TC7660 3 + 10µF (­5 V) ­ 26 *3-1/2 DIGIT ADC

Abstract: lcd 3902 2 digit 7 segment display 8 pin configuration analog panel meter CMOS 4049 internal circuit hamlin 3902 I1048 ic 4049 three and half digit 7 SEGMENT LCD DISPLAY TC7126

Text: SEMICONDUCTOR, INC. 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS 1 TC7126 TC7126A OSC 2 OSC 3 , DESCRIPTION 3 4 5 6 7 8 9 10 11 12 13 , 3-222 The TC7126A contains all the segment drivers necessary to directly drive a 3-1/2 digit LCD . An LCD backplane driver is included. The backplane frequency is the external clock frequency 800. For 3 , 1 TC7126 TC7126A 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS 2 FEATURES GENERAL

Text: -5 1 - 1 0 - 0 5 3 1/2 DIGIT A/D CONVERTER TC7106/7106A TC7107/7107A PIN DESCRIPTION 3 1/2 digit liquid crystal display ( LCD ). An LCD backplane driver is included , standard LCD dis plays to interface with the TC7106A 3 1/2 digit anateg-todigital converter. 1-130 , 1693 fi-0 8 TELEDYNE COMPONENTS 3bE D Û IlT tO a G 70l4b T 3 1/2 DIGIT A/D , DIGIT A/D CONVERTER T -5 1 -1 0 -0 5 TC7106/7106A TC7107/7107A PIN CONFIGURATIONS 1 5 i ! i i S 3

Text: DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD FEATURES Low Temperature Drift Internal Reference , Display Hold Function Directly Drives LCD or LED Display Guaranteed Zero Reading With Zero Input Low , hldr LCD IM ii o- -O - (W -1 - 31 ANALOG DIALOG 001 gF .C - L INPUT UJn V , COMMON (PIN 32) 3 CONVERSIONS/SEC Figure 2 1077-1 Typical TC7117/TC7117A Operating Circuit 1-135 1712 C -13 TEL EDYNE COMPONENTS 3bE ]> flT17bQ2 Q007DbS 3 «TSC T -5

Text: DIGIT A/D CONVERTER TC7106/7106A TC7107/7107A PIN DESCRIPTION 3 4 , 1*120 3 1/2 DIGIT A/D CONVERTER TC7106/7106A TC7107/7107A PIN DESCRIPTION (C o n t.) 3 1/2 digit liquid crystal display ( LCD ). An LCD backplane driver is included. The backplane , ^00 pF Figure 2 1075-1 (4350) TC7107A Typical Operating C ircuit 1-115 3 1/2 DIGIT A/D , 1-117 3 1/2 DIGIT A/D CONVERTER TC7106/7106A TC7107/71 OTA PIN CONFIGURATIONS (C o n t.) n n

Abstract: 4 DIGIT LCD DISPLAY 40 PIN 3 digits lcd display multimeter Samsung multimeter chip schematic lcd inverter samsung 4 digit 7 segment lcd display pin configuration digital multimeter 1000 TC7129 schematic 32" lcd inverter Digital Pulse Counter Two Digit

Text: 4-1/2 Digit Analgo-To-Digital Converterwith On-Chip LCD Drivers TC7129 PACKAGE DIMENSIONS TC7129 4-1/2 Digit Analog-To-Digital Converter with On-Chip LCD Drivers GENERAL DESCRIPTION , Microchip Technology Inc. DS21459A 4-1/2 Digit Analgo-To-Digital Converterwith On-Chip LCD Drivers , , DP4 TC7129-5 10/18/96 4-1/2 Digit Analgo-To-Digital Converterwith On-Chip LCD Drivers TC7129, Inc. DS21459A 4-1/2 Digit Analgo-To-Digital Converterwith On-Chip LCD Drivers TC7129 PIN

Text: WITH ON-CHIP LCD DRIVERS TC7129 PIN DESCRIPTIONS Pin No. TC7129CPL 1 2 3 4 5 6 7 8 9 10 11 12 , 4-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTER WITH ON-CHIP LCD DRIVERS TC7129 TC7129 4-1/2 DIGIT , 4-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTER WITH ON-CHIP LCD DRIVERS TC7129 ABSOLUTE MAXIMUM RATINGS , DIGIT ANALOG-TO-DIGITAL CONVERTER WITH ON-CHIP LCD DRIVERS TC7129 ELECTRICAL CHARACTERISTICS: V+ to V ­ , Max - - - - Unit µA µA µA µA PIN CONFIGURATIONS 3 4 5 6 7 8 9

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The Intersil is a high performance, low power 31/2 digit, A/D converter. Included are seven segment decoders, display drivers, a reference, and a clock. The ICL7136 is designed to interface with a liquid crystal display (LCD) and includes a multiplexed backplane drive. The ICL7136 brings together a combination of high accuracy, versatility, and true economy. It features auto-zero to less than 10�V, zero drift of less than 1�V/oC, input bias current of 10pA (Max), and rollover error of less than one count. True differential inputs and reference are useful in all systems, but give the designer an uncommon advantage when measuring load cells, strain gauges and other bridge type transducers. Finally, the true economy of single power supply operation, enables a high performance panel meter to be built with the addition of only 10 passive components and a display. The is an improved version of the ICL7126, eliminating the overrange hangover and hysteresis effects, and should be used in its place in all applications. It can also be used as a plug-in replacement for the in a wide variety of applications, changing only the passive components.

First Reading Overrange Recovery in One Conversion Period Guaranteed Zero Reading for 0V Input on All Scales True Polarity at Zero for Precise Null Detection 1pA Typical Input Current True Differential Input and Reference, Direct Display Drive - LCD ICL7136 Low Noise - Less Than 15�VP-P On Chip Clock and Reference No Additional Active Circuits Required Low Power - Less Than 1mW Surface Mount Package Available Drop-In Replacement for ICL7126, No Changes Needed

REF LO REF HI CREF + CREF (1000) AB4 (MINUS) POL OSC 1 39 OSC 2 38 OSC 3 37 TEST 36 REF HI 35 REF LO 34 CREF + 33 CREF 32 COMMON LO 29 A-Z 28 BUFF 27 INT G3 21 BP/GND (100"s) NC TEST OSC 3 NC OSC 2 OSC A3 G3 BP/GND POL F3 B3

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 321-724-7143 | Intersil and Design is a trademark of Intersil Americas Inc. | Copyright � Intersil Americas Inc. 2001

Supply Voltage to V-.15V Analog Input Voltage (Either Input) (Note V+ to VReference Input Voltage (Either Input). V+ to VClock Input ICL7136. TEST to V+

PDIP Package. 50 MQFP Package. 75 Maximum Junction Temperature.150oC Maximum Storage Temperature Range. to 150oC Maximum Lead Temperature (Soldering 10s). 300oC (MQFP - Lead Tips Only)

NOTES: 1. Input voltages may exceed the supply voltages provided the input current is limited JA is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.

VIN = 0V, Full Scale = 200mV VlN = VREF , VREF = 100mV -VIN = +VlN 200mV Difference in Reading for Equal Positive and Negative Inputs Near Full Scale Full Scale 200mV or Full Scale = 2V Maximum Deviation from Best Straight Line Fit (Note 5) VCM = �1V, VIN = 0V, Full Scale = 200mV (Note 5) VIN = 0V, Full Scale = 200mV (Peak-To-Peak Value Not Exceeded 95% of Time) (Note 5) VlN = 0V (Note 5) VlN To 70oC (Note 5) VIN To 70oC, (Ext. Ref. 0ppm/�oC) (Note 5) 25k Between Common and Positive Supply (With Respect to + Supply) 25k Between Common and Positive Supply (With Respect to + Supply) (Note 5)

Scale Factor Temperature Coefficient COMMON Pin Analog Common Voltage Temperature Coefficient of Analog Common SUPPLY CURRENT V+ Supply Current DISPLAY DRIVER Peak-To-Peak Segment Drive Voltage and Peak-To-Peak Backplane Drive Voltage NOTES:

3. Unless otherwise noted, specifications apply to the = 25oC, fCLOCK ICL7136 is tested in the circuit of Figure 1. 4. Back plane drive is in phase with segment drive for "off" segment, 180 degrees out of phase for "on" segment. Frequency is 20 times conversion rate. Average DC component is less than 50mV. 5. Not tested, guaranteed by design. 6. 48kHz oscillator increases current by 20�A (Typ).

The ICL7106 and ICL 7107 are high performance, low power 3-1/2 digit A/D converters. Included are seven segment decoders, Display drivers, a reference and a clock. The ICL 7106 is designed to interface with a liquid crystal display (LCD and includes a multiplexed backplane drive; the ICL 7107 will directly drive an instrument size light emitting diode (LED) display. The ICL7106 and ICL 7107 bring together a combination of high accuracy, versatility and true economy. True differential inputs and reference are useful in all systems, but give the designer advantage when measuring load cells, strain gauges, and other Bridge type transducers. By providing the true economy of a single power supply operation, the ICL7106 enables a high performance panel meter to be built with the addition of only 10 passive components and a display.

Guaranteed Zero Reading for OV Input on All Scales True Polarity at Zero for Precise Null Detection True Differential Input and Reference, Direct Display Drive Low Noise less than 15�Vp-p On chip clock and reference Low Power Dissipation, 10mW (typ.) No Additional Active Circuits Required Available in Small Outline Surface Mount Package, 44MQFP

VIN = 0.0V, Full Scale = 200mV VIN = VREF, VREF = 100mV -VIN = +VIN 200Mv Difference In Reading for Equal Positive and Negative Inputs Near Full Scale Full Scale 200mV or Full Scale = 2V Maximum Deviation from Best straight Line fit (Note 3) VCM = 1V, VIN = 0V, Full Scale = 200mV (Note 3) VIN = 0 (Does Not Include LED Current for ICL7107) ICL7107 Only 25 k Between Common and Positive Supply ( With Respect to + Supply = 9V

Notes: 1. Input voltages may exceed the supply voltages provided the input current is limited �100�A. 2. Unless otherwise noted, specifications apply to both the ICL7106 and = +25�C, fCLOCK ICL7107 is tested in the circuit of Figure ICL7107 is tested in the circuit of Figure 2. 3. Not Tested, guaranteed by design

Home/Test Equipment/Data Acquisition and Meters/Meters/Multimeters/Handheld Multimeters/DM-21 Multimeter Economical Digital 3-1/2 Digit LCD Display 7 Functions And 11 Ranges

The ICL7106 is designed t o interface with a liquid crystal displ ay (LCD) and includes a multiplexed bac kplane drive; the ICL7107 will directly drive an instrument size light emittin g diode (LED) display.