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Home - Analog & Interface Products - Mixed Signal Devices - Display A/D Converters - TC811 Device, download datasheet

Download Datasheets TC811 Device


The TC811 is a low power, 3-1/2 digit, LCD display analog-to-digital converter. This device incorporates both a display hold feature and differential reference inputs. A crystal oscillator, which only requires two pins, permits added features while retaining a 40-pin package. An additional feature is an "Integrator Output Zero" phase which guarantees rapid input overrange recovery. The TC811 display hold (HLDR) function can be used to "freeze" the LCD display. The displayed reading will remain indefinitely as long as HLDR is held high. Conversions continue but the output data display latches are not updated. The TC811 also includes a differential reference for easy ratiometric measurements. Circuits which use the 7106/26/36 can easily be upgraded to include the hold function with the TC811. The TC811 has an improved internal zener reference voltage circuit which maintains the Analog Common temperature drift to 35ppm/C (typical) and 75ppm/C (maxi-mum). This represents an improvement of two to four times over similar 3-1/2 digit converters, eliminating the need for a costly, space consuming external reference source. The TC811 limits linearity error to less than one count on both the 200mV and the 2.00V full-scale ranges. 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 currents and a 10 12 ? input impedance. The 15Vp-p noise performance guarantees a "rock solid" reading. The Auto Zero cycle guarantees a zero display readout for a zero volt input. The single chip CMOS TC811 incorporates all the active devices for a 3-1/2 digit analog to digital converter to directly drive an LCD display. On-board oscillator, precision voltage reference and display segment and backplane drivers simplify system integration, reduce board space requirements and lower total cost. A low cost, high resolution (0.05%) indicating meter requires only a TC811, an LCD display, five resistors, six capacitors, a crystal, and a 9V battery. Compact, hand held multimeter designs benefit from the Microchip Semiconductor small footprint package option. The TC811 uses a dual slope conversion technique which will reject interference signals if the converters integration time is set to a multiple of the interference signal period. This is especially useful in industrial measurement environments where 50, 60 and 400Hz line frequency signals are present.

Datasheet and Other Documentation

Detailed Content

Lit. Number

Download

 

TC811 Datasheet

21472a

Download TC811 Datasheet

Status

Obsolete

Specification Chart

Display Type

Supply Voltage (V)

Resolution (Digits)

Resolution (Counts)

Power (mW)

LCD

9

3 1/2

2000

0.5

Additional Features

Differential Reference Input
Display Hold Function
Fast Over-Range Recovery, Guaranteed Next Reading Accuracy
Low Temperature Drift Internal Reference:
35ppm/C (Typ)
Guaranteed Zero Reading With Zero Input
Low Noise:15mVp- High Resolution (0.05%) and Wide Dynamic Range (72 dB)
High Impedance Differential Input
Low Input Leakage Current 1pA (Typ) 10pA Max
Direct LCD Drive -No External Components
Precision Null Detection with True Polarity at Zero
Crystal Clock Oscillator
Available in DIP, Compact Flat Package or PLCC
Convenient 9V Battery Operation with Low Power Dissipation (600mA Typical, 1mW Maximum)

Package Options

40 PDIP(P), 44 PQFP(QF)



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