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TC826 Datasheet(PDF) 1 Page - Microchip Technology |
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TC826 Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 18 page  © 2002 Microchip Technology Inc. DS21477B-page 1 TC826 Features • Bipolar A/D Conversion • 2.5% Resolution • Direct LCD Display Drive • ‘Thermometer’ BAR or DOT Display • 40 Data Segments Plus Zero • Over Range Plus Polarity Indication • Precision On-Chip Reference: 35ppm/°C • Differential Analog Input • Low Input Leakage: 10pA • Display Flashes on Over Range • Display HOLD Mode • Auto-Zero Cycle Eliminates Zero Adjust Potentiometer • 9V Battery Operation • Low Power Consumption: 1.1mW • 20mV to 2.0V Full Scale Operation • Non-Multiplexed LCD Drive for Maximum Viewing Angle Device Selection Table General Description In many applications, a graphical display is preferred over a digital display. Knowing a process or system operates, for example, within design limits is more valu- able than a direct system variable read out. A bar or moving dot display supplies information precisely with- out requiring further interpretation by the viewer. The TC826 is a complete analog-to-digital converter with direct liquid crystal (LCD) display drive. The 40 LCD data segments plus zero driver give a 2.5% reso- lution bar display. Full scale differential input voltage range extends from 20mV to 2V. The TC826 sensitivity is 500 µV. A low drift 35ppm/°C internal reference, LCD backplane oscillator and driver, input polarity LCD driver, and over range LCD driver make designs simple and low cost. The CMOS design required only 125µA from a 9V battery. In +5V systems, a TC7660 DC to DC converter can supply the -5V supply. The differential analog input leakage is a low 10pA. Two display formats are possible. The BAR mode dis- play is like a ‘thermometer’ scale. The LCD segment driver that equals the input, plus all below it are on. The DOT mode activates only the segment equal to the input. In either mode, the polarity signal is active for negative input signals. An over range input signal causes the display to flash and activates the over range annunciator. A HOLD mode can be selected that freezes the display and prevents updating. The dual slope integrating conversion method with auto-zero phase maximizes noise immunity and elimi- nates zero scale adjustment potentiometers. Zero scale drift is a low 5 µV/°C. Conversion rate is typically 5 per second and is adjustable by a single external resistor. A compact, 0.5" square, flat package minimizes PC board area. The high pin count LSI package makes multiplexed LCD displays unnecessary. Low cost, direct drive LCD displays offer the widest viewing angle and are readily available. A standard display is avail- able now for TC826 prototyping work. Part Number Package Temperature Range TC826CBU 64-Pin PQFP 0 °Cto +70°C Analog-to-Digital Converter with Bar Graph Display Output |
Número de pieza similar - TC826 |
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Descripción similar - TC826 |
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