IC ADC 3 1/2DGT LCD DVR 40-DIP

TC7126CPL

Manufacturer Part NumberTC7126CPL
DescriptionIC ADC 3 1/2DGT LCD DVR 40-DIP
ManufacturerMicrochip Technology
TC7126CPL datasheet
 


Specifications of TC7126CPL

Display TypeLCDConfiguration7 Segment
Digits Or CharactersA/D 3.5 DigitsCurrent - Supply55µA
Voltage - Supply9VOperating Temperature0°C ~ 70°C
Mounting TypeThrough HolePackage / Case40-DIP (0.600", 15.24mm)
Resolution (bits)3.5bitInput Channel TypeDifferential
Data InterfaceParallelSupply Voltage Range - Analogue9V
Supply Current55µANo. Of Pins40
Operating Temperature Range0°C To +70°CDigital Ic Case StyleDIP
Rohs CompliantYesLead Free Status / RoHS StatusLead free / RoHS Compliant
Interface-Other namesTC7126CPLR
TC7126CPLR
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3-1/2 Digit Analog-to-Digital Converters
Features:
• Internal Reference with Low Temperature Drift:
- TC7126: 80ppm/°C, Typical
- TC7126A: 35ppm/°C, Typical
• Zero Reading with Zero Input
• Low Noise: 15μV
P-P
• High Resolution: 0.05%
• Low Input Leakage Current: 1pA Typ., 10pA Max.
• Precision Null Detectors with True Polarity at Zero
• High-Impedance Differential Input
• Convenient 9V Battery Operation with Low-Power
Dissipation: 500μW Typ., 900μW Max.
Applications:
• Thermometry
• Bridge Readouts: Strain Gauges, Load Cells,
Null Detectors
• Digital Meters and Panel Meters:
- Voltage/Current/Ohms/Power, pH
• Digital Scales, Process Monitors
Device Selection Table
Package
Package
Code
CPL
40-Pin PDIP
IPL
40-Pin PDIP (TC7126 Only)
CKW
44-Pin PQFP
CLW
44-Pin PLCC
© 2006 Microchip Technology Inc.
General Description:
The TC7126A is a 3-1/2 digit CMOS Analog-to-Digital
Converter (ADC) containing all the active components
necessary to construct a 0.05% resolution measure-
ment system. Seven-segment decoders, digit and
polarity drivers, voltage reference, and clock circuit are
integrated on-chip. The TC7126A directly drives a
Liquid Crystal Display (LCD), and includes a backplane
driver.
A low-cost, high resolution indicating meter requires
only a display, four resistors, and four capacitors. The
TC7126A’s extremely low-power drain and 9V battery
operation make it ideal for portable applications.
The TC7126A reduces linearity error to less than 1
count. Rollover error (the difference in readings for
equal magnitude, but opposite polarity input signals) is
below ±1 count. High-impedance differential inputs
offer 1pA leakage current and a 10
ance. The 15μV
solid” reading, and the auto-zero cycle ensures a zero
display reading with a 0V input.
The TC7126A features a precision, low drift internal
voltage reference and is functionally identical to the
TC7126. A low drift external reference is not normally
required with the TC7126A.
Temperature
Range
0°C to +70°C
-25°C to +85°C
0°C to +70°C
0°C to +70°C
TC7126/A
12
Ω input imped-
noise performance ensures a “rock
P-P
DS21458C-page 1

TC7126CPL Summary of contents

  • Page 1

    ... PDIP (TC7126 Only) CKW 44-Pin PQFP CLW 44-Pin PLCC © 2006 Microchip Technology Inc. General Description: The TC7126A is a 3-1/2 digit CMOS Analog-to-Digital Converter (ADC) containing all the active components necessary to construct a 0.05% resolution measure- ment system. Seven-segment decoders, digit and polarity drivers, voltage reference, and clock circuit are integrated on-chip ...

  • Page 2

    ... TC7126/A Package Type 44-Pin PLCC TC7126CLW 2 TC7126ACLW 40-Pin PDIP (Normal Normal Pin D 2 Configuration 1 TC7126CPL E 8 TC7126ACPL 33 1 TC7126IPL TC7126AIPL 10 100 1000 POL (Minus Sign) DS21458C-page REF REF TEST REF ANALOG OSC3 4 36 COMMON OSC2 OSC1 BUFF INT OSC1 OSC1 OSC2 ...

  • Page 3

    ... Typical Application 1MΩ + Analog 0.01μF Input – 0.33 180kΩ μF 0.15μF Note: Pin numbers refer to 40-pin DIP. © 2006 Microchip Technology Inc. 0.1μF TC7126 TC7126A REF REF 31 Segment 2– Drive 22– POL Minus Sign 21 BP ANALOG 32 COMMON ...

  • Page 4

    ... TC7126/A Functional Block Diagram DS21458C-page 4 © 2006 Microchip Technology Inc. ...

  • Page 5

    ... Average DC component is less than 50mV. 5: See “Typical Application”. 6: During Auto-Zero phase, current is 10-20μA higher. A 48kHz ocillator increases current by 8μA (Typical). Common current is not included. © 2006 Microchip Technology Inc. *Stresses above Maximum Ratings” may cause permanent damage to the device ...

  • Page 6

    ... During Auto-Zero phase, current is 10-20μA higher. A 48kHz ocillator increases current by 8μA (Typical). Common current is not included. DS21458C-page 6 – 16kHz, and T = +25°C, unless otherwise noted. A Min Typ Max 2.7 3.05 3. — 55 100 Unit Test Conditions V 250kΩ Between Common and P P-P μ 0V (Note 6) IN © 2006 Microchip Technology Inc. ...

  • Page 7

    ... ANALOG COMMON 33 (8) C REF © 2006 Microchip Technology Inc. Description Positive supply voltage. Activates the D section of the units display. Activates the C section of the units display. Activates the B section of the units display. Activates the A section of the units display. Activates the F section of the units display. ...

  • Page 8

    ... Pins 40, 39 and 38 make up the oscillator section. For a 48kHz clock (3 readings, 39 per second), connect Pin 40 to the junction of a 180kΩ resistor and a 50pF capacitor. The 180kΩ resistor is tied to Pin 39 and the 50pF capacitor is tied to Pin 38. © 2006 Microchip Technology Inc. ...

  • Page 9

    ... Basic Dual Slope Converter In a simple dual slope converter, a complete conver- sion requires the integrator output to “ramp-up” and “ramp-down.” A simple mathematical equation relates the input signal, reference voltage and integration time: © 2006 Microchip Technology Inc. EQUATION 3-1: Where Reference voltage R ...

  • Page 10

    ... The time required for the output to return to zero is propor- tional to the input signal and is between 0 and 2000 counts. The digital reading displayed is: EQUATION 4- 1000 V REF © 2006 Microchip Technology Inc. - should be IN ...

  • Page 11

    ... FIGURE 5-1: Display Font and Segment Assignment © 2006 Microchip Technology Inc. 5.1 System Timing The oscillator frequency is divided by four prior to clocking the internal decade counters. The four-phase measurement cycle takes a total of 4000 counts (16,000 clock pulses). The 4000-count cycle is independent of input signal magnitude ...

  • Page 12

    ... INT . Nominal Full Scale Voltage 200mV 2V 0.33μF 0.033μF 180kΩ 1.8MΩ 0.047μF 0.047μF = 48kHz (3 readings per sec). OSC is selected from the OSC 0. OSC generate the TC7126A’s by 800. frequencies of 20kHz, 100kHz, © 2006 Microchip Technology Inc. is ...

  • Page 13

    ... The differential reference can also be used where a digital zero reading is required when V zero. This is common in temperature measuring instru- mentation. A compensating offset voltage can be applied between analog common and V ducer output is connected between V common. © 2006 Microchip Technology Inc. V REF 100mV 400mV. ...

  • Page 14

    ... TC7126A and 80 ppm/°C for the TC7126. Segment Drive POL BP BUFF AZ INT OSC1 TC7126A OSC3 OSC2 ANALOG COMMON REF REF © 2006 Microchip Technology Inc – Integrator – 4000 = Integration time = I F OSC = Integration capacitor = Integration resistor ≠ COM IN - (Pin 35) REF should be large REF coefficient ...

  • Page 15

    ... DO NOT OPERATE IN THIS MODE FOR MORE THAN SEVERAL MINUTES. With TEST = V+, the LCD segments are impressed with a DC voltage which will destroy the LCD. © 2006 Microchip Technology Inc. 7.5 TC7126A Internal Voltage Reference The TC7126A’s analog common voltage temperature stability has been significantly improved (Figure 7-3). The “ ...

  • Page 16

    ... TEST 37 To Backplane Multiple Decimal Point or Annunciator Driver LCD To LCD Decimal Decimal Point Point 4030 GND Decimal Point and IC 51-42 Yamaichi Nepenthe Distribution 2471 East Bayshore, Ste. 520 Palo Alto, CA 94043 (650) 856-9332 R UNKNOWN x 1000 R STANDARD © 2006 Microchip Technology Inc. ...

  • Page 17

    ... C1 0.02μF 2V 47kΩ C2 900kΩ 1Ω 20V 10% 90kΩ 200V 10kΩ 3pF to 10pF, Variable C2 = 132pF, Variable COM FIGURE 8-3: 3-1/2 Digit True RMS AC DMM © 2006 Microchip Technology Inc. ≥ LCD + 1μF 1MΩ 10MΩ AD636 6.8μF ...

  • Page 18

    ... 0.7%/°C TC7126A PTC + - FIGURE 8-6: Coefficient Resistor Temperature Sensor REF TC7126A 50kΩ REF 50kΩ COMMON 160kΩ 1N4148 1 IN 20kΩ TC7126A REF 20kΩ REF COMMON Positive Temperature © 2006 Microchip Technology Inc. ...

  • Page 19

    ... Component Taping Orientation for 44-Pin PQFP Devices Carrier Tape, Number of Components Per Reel and Reel Size Package 44-Pin PQFP Note: Drawing does not represent total number of pins. © 2006 Microchip Technology Inc. User Direction of Feed P Standard Reel Component Orientation for 713 Suffix Device ...

  • Page 20

    ... W P Pitch (P) Part Per Full Reel 24 mm 500 .610 (15.49) .590 (14.99) 3° MIN. .700 (17.78) .610 (15.50) Dimensions: inches (mm) Reel Size 13 in Dimensions: inches (mm) © 2006 Microchip Technology Inc. ...

  • Page 21

    ... PQFP Pin 1 .018 (0.45) .012 (0.30) .031 (0.80) Typ. .398 (10.10) .390 (9.90) .557 (14.15) .537 (13.65) © 2006 Microchip Technology Inc. 7° Max. .009 (0.23) .005 (0.13) .398 (10.10) .390 (9.90) .557 (14.15) .537 (13.65) .096 (2.45) Max. Dimensions: inches (mm) TC7126/A ...

  • Page 22

    ... TC7126/A NOTES: DS21458C-page 22 © 2006 Microchip Technology Inc. ...

  • Page 23

    ... To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office PART CODE TC7126X X XXX A or blank* R (reversed pins) or blank (CPL pkg only) * "A" parts have an improved reference TC Package Code (see Device Selection Table) © 2006 Microchip Technology Inc. TC7126/A . DS21458C-page 23 ...

  • Page 24

    ... TC7126/A NOTES: DS21458C-page 24 © 2006 Microchip Technology Inc. ...

  • Page 25

    ... PowerMate, PowerTool, REAL ICE, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total Endurance, UNI/O, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. ...

  • Page 26

    ... Fax: 886-3-572-6459 Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 © 2006 Microchip Technology Inc. EUROPE Austria - Wels Tel: 43-7242-2244-399 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris Tel: 33-1-69-53-63-20 ...