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LTC1594LIS Datasheet(PDF) 4 Page - Linear Technology |
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LTC1594LIS Datasheet(HTML) 4 Page - Linear Technology |
4 / 24 page 4 LTC1594L/LTC1598L SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS tSMPL Analog Input Sample Time See Figure 1 in Applications Information 1.5 CLK Cycles fSMPL(MAX) Maximum Sampling Frequency See Figure 1 in Applications Information q 10.5 kHz tCONV Conversion Time See Figure 1 in Applications Information 12 CLK Cycles tdDO Delay Time, CLK ↓ to DOUT Data Valid See Test Circuits q 600 1500 ns tdis Delay Time, CS ↑ to DOUT Hi-Z See Test Circuits q 220 600 ns ten Delay Time, CLK ↓ to DOUT Enabled See Test Circuits q 180 500 ns thDO Time Output Data Remains Valid After CLK ↓ CLOAD = 100pF 520 ns tf DOUT Fall Time See Test Circuits q 60 180 ns tr DOUT Rise Time See Test Circuits q 80 180 ns tON Enable Turn-On Time See Figure 1 in Applications Information q 540 1200 ns tOFF Enable Turn-Off Time See Figure 2 in Applications Information q 190 500 ns tOPEN Break-Before-Make Interval q 125 350 ns CIN Input Capacitance Analog Inputs On-Channel 20 pF Off-Channel 5 pF Digital Input 5 pF AC CHARACTERISTICS 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 GND. Note 3: These devices are specified at 3V. Consult factory for 5V specified devices (LTC1594/LTC1598). Note 4: Increased leakage currents at elevated temperatures cause the S/H to droop, therefore it is recommended that fCLK ≥ 200kHz at 85°C, fCLK ≥ 75kHz at 70°C and fCLK ≥ 1kHz at 25°C. Note 5: VCC = 2.7V, VREF = 2.5V and CLK = 200kHz unless otherwise specified. CSADC and CSMUX pins are tied together during the test. Note 6: Linearity error is specified between the actual end points of the A/D transfer curve. 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 below GND or one diode drop above VCC. This spec allows 50mV forward bias of either diode for 2.7V ≤ VCC ≤ 3.6V. 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 3V input voltage range, it will therefore require a minimum supply voltage of 2.950V over initial tolerance, temperature variations and loading. Note 8: Recommended operating condition. Note 9: Channel leakage current is measured after the channel selection. TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Sample Rate Reference Current vs Temperature Supply Current vs Temperature SAMPLE FREQUENCY (kHz) 0.1 1 10 100 1000 1 10 100 1594L/98L G01 TA = 25°C VCC = 2.7V VREF = 2.5V fCLK = 200kHz TEMPERATURE ( °C) –55 60 100 180 220 260 –15 25 45 125 1594L/98L G02 140 –35 5 65 85 105 TA = 25°C VCC = 2.7V VREF = 2.5V fCLK = 200kHz fSMPL = 10.5kHz TEMPERATURE ( °C) –55 43 44 46 47 48 53 50 –15 25 45 125 1594L/98L G03 45 51 52 49 –35 5 65 85 105 VCC = 2.7V VREF = 2.5V fCLK = 200kHz fSMPL = 10.5kHz The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.(Note 5) |
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