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TC7109 Datasheet(PDF) 1 Page - TelCom Semiconductor, Inc |
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TC7109 Datasheet(HTML) 1 Page - TelCom Semiconductor, Inc |
1 / 21 page 3-91 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 FEATURES s Zero-Integrator Cycle for Fast Recovery From Input Overloads s Eliminates Cross -Talk in Multiplexed Systems s 12-Bit Plus Sign Integrating A/D Converter With Overrange Indication s Sign Magnitude Coding Format s True Differential Signal Input and Differential Reference Input s Low Noise ............................................ 15 µVP-P Typ s Input Current .............................................. 1 pA Typ s No Zero Adjustment Needed s TTL-Compatible, Byte-Organized Tri-State Outputs s UART Handshake Mode for Simple Serial Data Transmission ORDERING INFORMATION PART CODE TC7109X A or blank* 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 Plastic DIP 0 °C to +70°C IJL 40-Pin CerDIP –25 °C to +85°C * The "A" version has a higher IOUT on the digital lines. TC7109 TC7109A 12-BIT µP-COMPATIBLE ANALOG-TO-DIGITAL CONVERTERS GENERAL DESCRIPTION The TC7109A is a 12-bit plus sign, CMOS low-power analog-to-digital converter (ADC). Only eight passive com- ponents and a crystal are required to form a complete dual-slope integrating ADC. The improved VOH source current TC7109A has fea- tures that make it an attractive per-channel alternative to analog multiplexing for many data acquisition applica- tions. These features include typical input bias current of 1pA drift of less than 1 µV/°C, input noise typically 15µVP-P, and auto-zero. True differential input and reference allow measurement of bridge-type transducers such as load cells, strain gauges, and temperature transducers. The TC7109A provides a versatile digital interface. In the direct mode, chip select and HIGH/LOW byte enables control parallel bus interface. In the handshake mode, the TC7109A will operate with industry-standard UARTs in controlling serial data transmission — ideal for remote data logging. Control and monitoring of conversion timing is provided by the RUN/HOLD input and STATUS output. For applications requiring more resolution, see the TC500, 15-bit plus sign ADC data sheet. The TC7109A has improved overrange recovery per- formance and higher output drive capability than the origi- nal TC7109. All new (or existing) designs should specify the TC7109A wherever possible. FUNCTIONAL BLOCK DIAGRAM INPUT HI AZ BUFF CAZ INT BUFFER INTEGRATOR AZ ZI AZ ZI DE (+) AZ INT AZ COMPARATOR COMP OUT 35 31 30 CREF AZ DE ( ±) ZI 33 34 COMMON INPUT LO INT 37 36 REF IN DE (–) DE (–) DE (+) RINT CINT 38 39 REF CAP REF CAP ZI 6.2V 10 µA 28 40 V + V – 29 REF OUT 17 3 4 5 6 7 8 9 10 11 12 13 14 226 22 23 24 25 21 TO ANALOG SECTION COMP OUT AZ INT DE ( ±) ZI CONVERSION CONTROL LOGIC OSCILLATOR AND CLOCK CIRCUITRY HANDSHAKE LOGIC 15 16 27 18 19 20 LBEN HBEN CE/LOAD 1 GND 14 LATCHES 12-BIT COUNTER 16 THREE-STATE OUTPUTS SEND MODE BUF OSC OUT OSC SEL OSC OUT OSC IN RUN/ HOLD STATUS HIGH-ORDER BYTE OUTPUTS LOW-ORDER BYTE OUTPUTS TC7109A + + REF IN – LATCH CLOCK 32 – + + – – + – TC7109/A-7 11/6/96 |
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Similar Description - TC7109 |
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