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LTC2473CMS Datasheet(PDF) 11 Page - Linear Technology |
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LTC2473CMS Datasheet(HTML) 11 Page - Linear Technology |
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11 / 20 page  LTC2471/LTC2473 11 24713f APPLICATIONS INFORMATION Figure 6. Read Sequence Timing Diagram the request and issues a NAK by leaving the SDA line HIGH. If the conversion is complete, the LTC2471/LTC2473 issue an ACK by pulling the SDA line LOW. Following the ACK, the LTC2471/LTC2473 can output data. The data output stream is 16 bits long and is shifted out on the falling edges of SCL (see Figure 6). The DATA INPUT/OUTPUT state is concluded once all 16 data bits have been read or after a STOP condition. 17 8 9 2 3 18 D8 D13 D14 MSB D15 R SDA SCL 7-BIT ADDRESS START BY MASTER D7 D6 D5 D0 LSB 91 2 3 8 9 ACK BY MASTER NACK BY MASTER SLEEP DATA OUTPUT CONVERSION 24713 F06 ACK BY LTC2471/LTC2473 Table 1. LTC2471/LTC2473 Output Data Format SINGLE ENDED INPUT VIN (LTC2471) DIFFERENTIAL INPUT VOLTAGE VIN+ – VIN– (LTC2473) D15 (MSB) D14 D13 D12...D2 D1 D0 (LSB) CORRESPONDING DECIMAL VALUE ≥VREF ≥VREF 1 1 1 1 1 1 65535 VREF – 1LSB VREF – 1LSB 1 1 1 1 1 0 65534 0.75 • VREF 0.5 • VREF 1 1 0 0 0 0 49152 0.75 • VREF – 1LSB 0.5 • VREF – 1LSB 1 0 1 1 1 1 49151 0.5 • VREF 0 1 0 0 0 0 0 32768 0.5 • VREF – 1LSB –1LSB 0 1 1 1 1 1 32767 0.25 • VREF –0.5 • VREF 0 1 0 0 0 0 16384 0.25 • VREF – 1LSB –0.5 • VREF – 1LSB 0 0 1 1 1 1 16383 0 ≤ –VREF 000 0 0 0 0 The LTC2473 (differential input) output code is given by INT(32767.5 • (VIN+ – VIN–)/VREF + 32767.5. The first bit output by the LTC2473, D15, is the MSB, which is 1 for VIN+ ≥ VIN– and 0 for VIN+ < VIN–. This bit is followed by successively less significant bits (D14, D13, …) until the LSB is output by the LTC2473, see Table 1. The LTC2471 (single-ended input) output code is a direct binary encoded result, see Table 1. |
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