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TC7126ACKW Datasheet(PDF) 1 Page - TelCom Semiconductor, Inc |
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TC7126ACKW Datasheet(HTML) 1 Page - TelCom Semiconductor, Inc |
1 / 13 page 3-217 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 TC7126 TC7126A 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS FEATURES s Low Temperature Drift Internal Reference TC7126 ....................................... 80 ppm/ °C Typ TC7126A ..................................... 35 ppm/ °C Typ s Guaranteed Zero Reading With Zero Input s Low Noise .................................................... 15 µVP-P s High Resolution .............................................. 0.05% s Low Input Leakage Current ...................... 1 pA Typ 10 pA Max s Precision Null Detectors With True Polarity at Zero s High-Impedance Differential Input s Convenient 9V Battery Operation With Low Power Dissipation ........................ 500 µW Typ 900 µW Max TYPICAL APPLICATIONS s Thermometry s Bridge Readouts: Strain Gauges, Load Cells, Null Detectors s Digital Meters and Panel Meters — Voltage/Current/Ohms/Power, pH s Digital Scales, Process Monitors GENERAL DESCRIPTION The TC7126A is a 3-1/2 digit CMOS analog-to-digital converter (ADC) containing all the active components nec- essary to construct a 0.05% resolution measurement sys- tem. 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. Roll-over error (the difference in readings for equal magnitude but opposite polarity input signals) is below ±1 count. High-impedance differential inputs offer 1 pA leak- age current and a 1012 Ω input impedance. The 15 µVP-P noise performance guarantees a "rock solid" reading, and the auto-zero cycle guarantees 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. ORDERING INFORMATION 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 below): Package Temperature Code Package Range CKW 44-Pin PQFP 0 °C to +70°C CLW 44-Pin PLCC 0 °C to +70°C CPL 40-Pin PDIP 0 °C to +70°C IPL 40-Pin PDIP (non-A only) – 25 °C to +85°C VREF + TC7126 TC7126A 33 34 240 k Ω 10 k Ω 31 29 39 38 40 VREF – 0.33 µF 0.1 µF V – 1 OSC 3 OSC 2 OSC TO ANALOG COMMON (PIN 32) 1 CONVERSION/SEC COSC 560 k Ω 180 k Ω 0.15 µF 0.01 µF ANALOG INPUT + – CREF – CREF + VIN + VIN – ANALOG COMMON VINT VBUFF CAZ 20 21 1 SEGMENT DRIVE 2–19 22–25 POL BP V + MINUS SIGN BACKPLANE 28 50 pF LCD 1 M Ω 27 30 32 35 36 9V + ROSC 26 NOTE: Pin numbers refer to 40-pin DIP. 40-Pin Plastic DIP 44-Pin Plastic Quad Flat Package Formed Leads 44-Pin Plastic Chip Carrier PLCC AVAILABLE PACKAGES TYPICAL OPERATING CIRCUIT TC7126/A-8 11/6/96 |
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