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LTC1290 Arkusz danych(PDF) 4 Page - Linear Technology |
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LTC1290 Arkusz danych(HTML) 4 Page - Linear Technology |
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4 / 28 page  4 LTC1290 LTC1290B/LTC1290C/LTC1290D SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS ISINK Output Sink Current VOUT = VCC 20 mA ICC Positive Supply Current CS High q 612 mA CS High LTC1290BC, LTC1290CC q 510 µA Power Shutdown LTC1290DC, LTC1290BI ACLK Off LTC1290CI, LTC1290DI LTC1290BM, LTC1290CM q 515 µA LTC1290DM IREF Reference Current VREF = 5V q 10 50 µA I– Negative Supply Current CS High q 150 µA ELECTRICAL C C HARA TER STICS DIGITAL A D I DC (Note 3) below V – or one diode drop above VCC. Be careful during testing at low VCC levels (4.5V), as high level reference or analog inputs (5V) can cause this input diode to conduct, especially at elevated temperatures and cause errors for inputs near full scale. This spec allows 50mV forward bias of either diode. This means that as long as the reference or analog input does not exceed the supply voltage by more than 50mV, the output code will be correct. To achieve an absolute 0V to 5V input voltage range will therefore require a minimum supply voltage of 4.950V over initial tolerance, temperature variations and loading. Note 8: Channel leakage current is measured after the channel selection. Note 9: To minimize errors caused by noise at the chip select input, the internal circuitry waits for two ACLK falling edge after a chip select falling edge is detected before responding to control input signals. Therefore, no attempt should be made to clock an address in or data out until the minimum chip select setup time has elapsed. Note 10: Increased leakage currents at elevated temperatures cause the S/H to droop, therefore it's recommended that fACLK ≥ 500kHz at 125°C, fACLK ≥ 125kHz at 85°C and fACLK ≥ 15kHz at 25°C. The q denotes specifications which apply over the full 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 with DGND, AGND and REF– wired together (unless otherwise noted). Note 3: VCC = 5V, VREF+ = 5V, VREF – = 0V, V – = 0V for unipolar mode and – 5V for bipolar mode, ACLK = 4.0MHz unless otherwise speicfied. Note 4: These specs apply for both unipolar and bipolar modes. In bipolar mode, one LSB is equal to the bipolar input span (2VREF) divided by 4096. For example, when VREF = 5V, 1LSB (bipolar) = 2(5V)/4096 = 2.44mV. Note 5: Integral nonlinearity 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. Note 6: Recommended operating conditions. Note 7: Two on-chip diodes are tied to each reference and analog input which will conduct for reference or analog input voltages one diode drop CC HARA TERISTICS A TYPICALPERFOR CE Supply Current vs Temperature Supply Current vs Supply Voltage Unadjusted Offset Voltage vs Reference Voltage SUPPLY VOLTAGE, VCC (V) 46 8 10 1290 • TPC01 26 22 18 14 10 6 2 ACLK = 4MHz TA = 25°C AMBIENT TEMPERATURE, TA (°C) –50 30 10 9 8 7 6 5 4 3 LT1290 • TPC02 –10 70 –30 50 10 90 110 130 ACLK = 4MHz VCC = 5V REFERENCE VOLTAGE, VREF (V) 1 5 1290 • TPC03 2 3 4 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 VOS = 0.25mV VOS = 0.125mV VCC = 5V |
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