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LTC1855IG Datasheet(PDF) 9 Page - Linear Technology |
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LTC1855IG Datasheet(HTML) 9 Page - Linear Technology |
9 / 24 page 9 LTC1854/LTC1855/LTC1856 185456fa PI FU CTIO S COM (Pin 1): Common Input. This is the negative refer- ence point for all single-ended inputs. It must be free of noise and is usually connected to the analog ground plane. CH0 (Pin 2): Analog MUX Input. CH1 (Pin 3): Analog MUX Input. CH2 (Pin 4): Analog MUX Input. CH3 (Pin 5): Analog MUX Input. CH4 (Pin 6): Analog MUX Input. CH5 (Pin 7): Analog MUX Input. CH6 (Pin 8): Analog MUX Input. CH7 (Pin 9): Analog MUX Input. MUXOUT+ (Pin 10): Positive MUX Output. Output of the analog multiplexer. Connect to ADC+ for normal operation. MUXOUT– (Pin 11): Negative MUX Output. Output of the analog multiplexer. Connect to ADC– for normal operation. ADC+ (Pin 12): Positive Analog Input to the Analog-to- Digital Converter. ADC– (Pin 13): Negative Analog Input to the Analog-to- Digital Converter. AGND1 (Pin 14): Analog Ground. VREF (Pin 15): 2.5V Reference Output. Bypass to analog ground with a 1 mF tantalum capacitor. REFCOMP (Pin 16): Reference Buffer Output. Bypass to analog ground with a 10 mF tantalum and a 0.1mF ceramic capacitor. Nominal output voltage is 4.096V. AGND2 (Pin 17): Analog Ground. AGND3 (Pin 18): Analog Ground. This is the substrate connection. AVDD (Pin 19): 5V Analog Supply. Bypass to analog ground with a 0.1 mF ceramic and a 10mF tantalum capacitor. DVDD (Pin 20): 5V Digital Supply. Bypass to digital ground with a 0.1 mF ceramic and a 10mF tantalum capacitor. OVDD (Pin 21): Positive Supply for the Digital Output Buffers (3V to 5V). Bypass to digital ground with a 0.1 mF ceramic and a 10 mF tantalum capacitor. BUSY (Pin 22): Output shows converter status. It is low when a conversion is in progress. SDO (Pin 23): Serial Data Output. |
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