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LTC1287CIN Datasheet(PDF) 3 Page - Linear Technology |
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LTC1287CIN Datasheet(HTML) 3 Page - Linear Technology |
3 / 16 page LTC1287 3 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIH High Level Input Voltage VCC = 3.6V q 2.1 V VIL Low Level Input Voltage VCC = 3.0V q 0.45 V IIH High Level Input Current VIN = VCC q 2.5 µA IIL Low Level Input Current VIN = 0V q –2.5 µA VOH High Level Output Voltage VCC = 3.0V, IO = 20µA 2.90 V IO = 400µA q 2.7 2.85 V VOL Low Level Output Voltage VCC = 3.0V, IO = 20µA 0.05 V IO = 400µA q 0.10 0.3 V IOZ High Z Output Leakage VOUT = VCC, CS High q 3 µA VOUT = 0V, CS High q –3 µA ISOURCE Output Source Current VOUT = 0V –10 mA ISINK Output Sink Current VOUT = VCC 9mA ICC Positive Supply Current CS High q 1.5 5 mA IREF Reference Current VREF = 2.5V q 10 50 µA SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS thDO Time Output Data Remains Valid After CLK ↓ 50 ns tf DOUT Fall Time See Test Circuits q 40 100 ns tr DOUT Rise Time See Test Circuits q 40 100 ns tWHCLK CLK High Time VCC = 3V (Note 6) 600 ns tWLCLK CLK Low Time VCC = 3V (Note 6) 800 ns tsuCS Setup Time, CS ↓ Before CLK↑ VCC = 3V (Note 6) 100 ns tWHCS CS High Time Between Data Transfer Cycles VCC = 3V (Note 6) 5.0 µs tWLCS CS Low Time During Data Transfer VCC = 3V (Note 6) 14 CLK Cycles CIN Input Capacitance Analog Inputs On Channel 100 pF Analog Inputs Off Channel 5 pF Digital Inputs 5 pF AC CHARACTERISTICS LTC1287B/LTC1287C ELECTRICAL C C HARA TER STICS DIGITAL A D I DC (Note 3) (Note 3) The q denotes specifications which apply over the operating temperature range; all other limits and typicals TA = 25°C. Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: All voltage values are with respect to ground (unless otherwise noted). Note 3: VCC = 3V, VREF = 2.5V, CLK = 500kHz unless otherwise specified. Note 4: One LSB is equal to VREF divided by 4096. For example, when VREF = 2.5V, 1LSB = 2.5V/4096 = 0.61mV. Note 5: Integral nonlinearity error is defined as the deviation of a code from a straight line passing through the actual endpoints of the transfer curve. The deviation is measured from the center of the quantization band. LTC1287B/LTC1287C Note 6: Recommended operating conditions. Note 7: Two on-chip diodes are tied to each analog input which will conduct for analog voltages one diode drop below GND or one diode drop above VCC. Be careful during testing at low VCC levels, as high level analog inputs can cause this input diode to conduct, especially at elevated temperature, and cause errors for inputs near full scale. This spec allows 50mV forward bias of either diode. This means that as long as the analog input does not exceed the supply voltage by more than 50mV, the output code will be correct. Note 8: Channel leakage current is measured after the channel selection. Note 9: Increased leakage currents at elevated temperatures cause the S/ H to droop, therefore it is recommended that fCLK ≥ 30kHz at 85°C and fCLK ≥ 3kHz at 25°C. |
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