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TC850CPL 데이터시트(PDF) 1 Page - TelCom Semiconductor, Inc |
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TC850CPL 데이터시트(HTML) 1 Page - TelCom Semiconductor, Inc |
1 / 14 page 3-77 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 TC850 FEATURES s 15-bit Resolution Plus Sign Bit s Up to 40 Conversions per Second s 12 Conversions per Second Guaranteed s Integrating ADC Technique — Monotonic — High Noise Immunity — Auto-Zeroed Amplifiers Eliminate Offset Trimming s Wide Dynamic Range ...................................... 96dB s Low Input Bias Current ................................... 30pA s Low Input Noise ........................................... 30 µV P-P s Sensitivity ....................................................... 100 µV s Flexible Operational Control — Continuous or On-Demand Conversions — Data Valid Output s Bus Compatible, 3-State Data Outputs — 8-Bit Data Bus — Simple µP Interface — Two Chip Enables — Read ADC Result Like Memory s ± 5V Power Supply Operation ...................... 20mW s 40-Pin Dual-in-Line or 44-Pin PLCC Packages GENERAL DESCRIPTION The TC850 is a monolithic CMOS analog-to-digital converter (ADC) with resolution of 15-bits plus sign. It combines a chopper-stabilized buffer and integrator with a unique multiple-slope integration technique that increases conversion speed. The result is 16 times improvement in speed over previous 15-bit, monolithic integrating ADCs (from 2.5 conversions per sec up to 40 per sec). Faster conversion speed is especially welcome in systems with human interface, such as digital scales. The TC850 incorporates an ADC and a µP-compatible digital interface. Only a voltage reference and a few noncriti- cal passive components are required to form a complete 15- bit plus sign ADC. CMOS processing provides the TC850 with high- impedance differential inputs. Input bias current is typically only 30pA, permitting direct interface to sensors. Input sensitivity of 100 µV per least significant bit (LSB) eliminates the need for precision external amplifiers. The internal amplifiers are auto-zeroed, guaranteeing a zero digital output with 0V analog input. Zero adjustment potentiometers or calibrations are not required. The TC850 outputs data on an 8-bit, 3-state bus. Digital inputs are CMOS compatible; outputs are TTL/CMOS com- patible. Chip-enable and byte-select inputs combined with an end-of-conversion output ensures easy interfacing to a wide variety of microprocessors. Conversions can be per- formed continuously or on command. In continuous mode, data is read as three consecutive bytes and manipulation of address lines is not required. Operating from ±5V supplies, the TC850 dissipates only 20mW. It is packaged in 40-pin plastic or ceramic dual-in- line packages (DIPs) and in a 44-pin plastic leaded chip carrier (PLCC), surface-mount package. ORDERING INFORMATION Part No. Package Temperature Range TC850CLW 44-Pin PLCC 0 °C to +70°C TC850CPL 40-Pin Plastic DIP 0 °C to +70°C TC850IJL 40-Pin CerDIP – 25 °C to +85°C TC850ILW 44-Pin PLCC – 25 °C to +85°C FUNCTIONAL BLOCK DIAGRAM 15-BIT, FAST-INTEGRATING CMOS ANALOG-TO-DIGITAL CONVERTER ÷4 REF1 + – BUF INT IN BUFFER INTEGRATOR COMPARATOR 32 23 24 25 36 34 39 15 8 DB7 TC850 REF RINT CINT INT OUT IN + – + – + 6-BIT UP/DOWN COUNTER – + REF2 + DB0 9-BIT UP/DOWN COUNTER . . . . 5 3 WR CONT/ DEMAND ANALOG MUX 31 30 IN – COMMON 22 40 +5V –5V 18 OSC2 17 7 L/H 6 OVR/ POL 4 RD 1 CS 2 CE OSC1 A/D CONTROL SEQUENCER DATA LATCH OCTAL 2-INPUT MUX 3-STATE DATA BUS CLOCK OSCILLATOR BUS INTERFACE DECODE LOGIC TC850-4 11/5/96 |
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