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TC7136CPL Datasheet(PDF) 1 Page - TelCom Semiconductor, Inc |
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TC7136CPL Datasheet(HTML) 1 Page - TelCom Semiconductor, Inc |
1 / 12 page 3-247 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 TC7136 TC7136A A or blank* R (reversed pins) or blank (CPL pkg only) * "A" parts have an improved reference TC Package Code (see below): TYPICAL APPLICATIONS s Thermometry s Bridge Readouts: Strain Gauges, Load Cells, Null Detectors s Digital Meters: Voltage/Current/Ohms/Power, pH s Digital Scales, Process Monitors s Portable Instrumentation ORDERING INFORMATION PART CODE TC7136X X XXX Package Temperature Code Package Pin Layout Range CKW 44-Pin PQFP Formed Leads 0 °C to +70°C CLW 44-Pin PLCC — 0 °C to +70°C CPL 40-Pin PDIP Normal 0 °C to +70°C 40-Pin Plastic DIP 44-Pin Plastic Quad Flat Package Formed Leads 44-Pin Plastic Chip Carrier PLCC VREF + TC7136 TC7136A 33 34 240 k Ω 10 k Ω 31 29 39 38 40 VREF – 0.47 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 9–19 22–25 POL BP V + MINUS SIGN BACKPLANE 28 50 pF LCD 1 M Ω 27 30 32 35 36 9V + ROSC 26 TYPICAL OPERATING CIRCUIT AVAILABLE PACKAGES LOW POWER, 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS FEATURES s Fast Overrange Recovery, Guaranteed First Reading Accuracy s Low Temperature Drift Internal Reference TC7136 ....................................... 70 ppm/ °C Typ TC7136A ..................................... 35 ppm/ °C Typ s Guaranteed Zero Reading With Zero Input s Low Noise .................................................... 15 µV P-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 GENERAL DESCRIPTION The TC7136 and TC7136A are low-power, 3-1/2 digit with liquid crystal display (LCD) drivers with analog-to- digital converters. These devices incorporate an "integra- tor output zero" phase which guarantees overrange recovery. The performance of existing TC7126, TC7126A and ICL7126-based systems may be upgraded with minor changes to external, passive components. The TC7136A has an improved internal zener refer- ence voltage circuit which maintains the analog common temperature drift to 35 ppm/ °C (typical) and 75 ppm/°C (maximum). This represents an improvement of two to four times over similar 3-1/2 digit converters. The costly, space- consuming external reference source may be removed. The TC7136/A limits linearity error to less than 1 count on 200 mV or 2V full-scale ranges. 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 leakage currents and a 1012 Ω input impedance. The differential reference input allows ratiometric measurements for ohms or bridge transducer measurements. The 15 µVP-P noise performance guaran- tees a "rock solid" reading. The auto-zero cycle guarantees a zero display readout for a 0V input. TC7136-6 10/18/96 |
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