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LTC2641 Datasheet(PDF) 8 Page - Linear Technology |
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LTC2641 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 24 page  LTC2379-18 8 237918p CHAIN (Pin 1): Chain Mode Selector Pin. When low, the LTC2379-18 operates in Normal Mode and the RDL/SDI input pin functions to enable or disable SDO. When high, the LTC2379-18 operates in Chain Mode and the RDL/ SDI pin functions as SDI, the daisychain serial data input. VDD (Pin 2): 2.5V Power Supply. The range of VDD is 2.375V to 2.625V. Bypass VDD to GND with a 10μF ceramic capacitor. GND (Pins 3, 6, 10 and 16): Ground. IN+, IN– (Pins 4, 5): Positive and Negative Differential Analog Inputs. REF (Pin 7): Reference Input. The range of REF is 2.5V to 5.1V. This pin is referred to the GND pin and should be decoupled closely to the pin with a 47μF ceramic capacitor (X5R, 0805 size). REF/DGC (Pin 8): When tied to REF, digital gain compression is disabled and the LTC2379-18 defines full-scale according to the ±VREF analog input range. When tied to GND, digital gain compression is enabled and the LTC2379-18 defines full-scale with inputs that swing between 10% and 90% of the ±VREF analog input range. CNV (Pin 9): Convert Input. A rising edge on this input powers up the part and initiates a new conversion. BUSY (Pin 11): BUSY indicator. Goes high at the start of a new conversion and returns low when the conversion has finished. RDL/SDI (Pin 12): When CHAIN is low, the part is in Nor- mal Mode and the pin is treated as a bus enabling input. When CHAIN is high, the part is in chain mode and the pin is treated as a serial data input pin where data from another ADC in the daisychain is input. SCK (Pin 13): Serial Data Clock Input. When SDO is enabled, the conversion result or daisychain data from another ADC is shifted out on the rising edges of this clock MSB first. SDO (Pin 14): Serial Data Output. The conversion result or daisychain data is output on this pin on each rising edge of SCK MSB first. The output data is in 2’s comple- ment format. OVDD (Pin 15): I/O Interface Digital Power. The range of OVDD is 1.71V to 5.25V. This supply is nominally set to the same supply as the host interface (1.8V, 2.5V, 3.3V, or 5V). Bypass OVDD to GND with a 0.1μF capacitor. GND (Exposed Pad Pin 17 – DFN Package Only): Ground. Exposed pad must be soldered directly to the ground plane. FUNCTIONAL BLOCK DIAGRAM PIN FUNCTIONS REF = 5V LTC2379-18 IN+ VDD = 2.5V OVDD = 1.8V to 5V IN– CHAIN CNV GND BUSY REF/DGC SDO SCK RDL/SDI CONTROL LOGIC 18-BIT SAMPLING ADC SPI PORT + – 237918 BD01 |
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Similar Description - LTC2641 |
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