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LTC2435-1IGN датащи(PDF) 15 Page - Linear Technology |
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LTC2435-1IGN датащи(HTML) 15 Page - Linear Technology |
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15 / 40 page ![]() LTC2435/LTC2435-1 15 24351fa Table 2. LTC2435/LTC2435-1 Output Data Format Differential Input Voltage Bit 23 Bit 22 Bit 21 Bit 20 Bit 19 Bit 18 Bit 17 … Bit 0 VIN* EOC DMY SIG MSB VIN* ≥ 0.5 • VREF** 0 0110 0 0 … 0 0.5 • VREF** – 1LSB 0 0101 1 1 … 1 0.25 • VREF** 0 0101 0 0 … 0 0.25 • VREF** – 1LSB 0 0100 1 1 … 1 0 0 0100 0 0 … 0 –1LSB 0 0011 1 1 … 1 – 0.25 • VREF** 0 0011 0 0 … 0 – 0.25 • VREF** – 1LSB 0 0010 1 1 … 1 – 0.5 • VREF** 0 0010 0 0 … 0 VIN* < –0.5 • VREF** 0 0001 1 1 … 1 *The differential input voltage VIN = IN + – IN–. **The differential reference voltage VREF = REF + – REF–. Figure 3. Output Data Timing APPLICATIO S I FOR ATIO MSB SIG “0” BIT 0 BIT 19 BIT 5 LSB BIT 20 BIT 21 BIT 22 SDO SCK CS EOC BIT 23 SLEEP DATA OUTPUT CONVERSION 2435 F03 Hi-Z Figure 4. Offset vs VCC Figure 5. Offset vs Temperature Figure 6. Offset vs VCC (VREF = VCC) tional to VCC (see Figure 4), several characteristics of this variation can be used to eliminate the effects. First, the variation with respect to supply voltage is linear. Second, the magnitude of the offset error decreases with de- creased supply voltage. Third, the offset error in micro- volts is almost independent with reference and therefore the offset in ppm is inverse proportional to reference voltage. As a result, by tying VCC to VREF, the variation with supply can be reduced, see Figure 6. The variation with supply is less than 15ppm over the entire 2.7V to 5.5V supply range. Frequency Rejection Selection LTC2435 (FO) VCC (V) 2.5 3.0 3.5 4.5 4.0 5.0 5.5 2435 F04 –350 –400 –450 –500 –550 –600 –650 –700 –750 REF+ = 2.5V REF– = GND VIN = 0V VINCM = GND FO = GND TA = 25°C TEMPERATURE (°C) –45 –30 0 –15 15 30 90 2435 F05 45 60 75 –324 –325 –326 –327 –328 –329 –330 VCC = 5V VREF = 5V VIN = 0V VINCM = GND FO = GND VCC and VREF (V) 2.5 3.0 3.5 4.5 4.0 5.0 5.5 2435 F06 –300 –305 –310 –315 –320 –325 –330 –335 –340 –345 –350 REF+ = VCC REF– = GND VIN = 0V VINCM = GND FO = GND TA = 25°C – |
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