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LTC1090AC Datasheet(PDF) 9 Page - Linear Technology |
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LTC1090AC Datasheet(HTML) 9 Page - Linear Technology |
9 / 28 page 9 LTC1090 1090fc TYPICAL PERFOR A CE CHARACTERISTICS Digital Input Logic Threshold vs Supply Voltage Input Channel Leakage Current vs Temperature Noise Error vs Reference Voltage The LTC1090 is a data acquisition component which contains the following functional blocks: 1. 10-bit successive approximation capacitive A/D converter 2. Analog multiplexer (MUX) 3. Sample and hold (S/H) 4. Synchronous, full duplex serial interface 5. Control and timing logic DIGITAL CONSIDERATIONS 1. Serial Interface The LTC1090 communicates with microprocessors and other external circuitry via a synchronous, full duplex, four wire serial interface (see Operating Sequence). The shift clock (SCLK) synchronizes the data transfer with each bit being transmitted on the falling SCLK edge and captured on the rising SCLK edge in both transmit- ting and receiving systems. The data is transmitted and received simultaneously (full duplex). Operating Sequence (Example: Differential Inputs (CH3 to CH2), Bipolar, MSB First and 10-Bit Word Length) REFERENCE VOLTAGE, VREF (V) 0.2 0.5 1.0 2.0 15 LTC1090 • TPC21 1.5 0.25 0.75 1.75 1.25 LTC1090 NOISE = 200µV PEAK-TO-PEAK APPLICATIO S I FOR ATIO SUPPLY VOLTAGE, VCC (V) 4 0 1 2 3 4 56 7 8 LTC1090 • TPC19 910 TA = 25°C AMBIENT TEMPERATURE, TA (°C) –50 100 300 400 500 1000 700 0 50 75 LTC1090 • TPC20 200 800 900 600 –25 25 100 125 GUARANTEED ON CHANNEL OFF CHANNELS LTC1090 • AI01 B9 (SB) SHIFT A/D RESULT OUT AND NEW CONFIGURATION WORD IN B8 B7 B6 B5 B4 B3 B2 B1 B0 SHIFT CONFIGURATION WORD IN ODD/ SIGN SGL/ DIFF SEL1 DIN CS 15 8 10 SCLK DOUT SEL0 UNI MSBF WL1 WL0 tCYC tSMPL tCONV DON’T CARE DON’T CARE |
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