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TLC1518 Datasheet(PDF) 19 Page - Texas Instruments |
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TLC1518 Datasheet(HTML) 19 Page - Texas Instruments |
19 / 39 page TLC1514, TLC1518 5-V, 10-BIT, 400 KSPS, 4/8 CHANNEL, LOW POWER, SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN SLAS252 – DECEMBER 1999 19 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 FIFO operation (continued) power down Writing 8000h to the device puts the device into a software power-down state. For a hardware power down, the dedicated PWDN pin provides another way to power down the device asynchronously. These two power-down modes power down the entire device including the built-in reference to save power. The internal reference requires 20 ms to resume from either a software or hardware power down. Auto power down mode is always enabled. This mode maintains the built-in reference if an internal reference is used, so resumption is fast enough to be used between cycles. The configuration register is not affected by any of the power down modes but the sweep operation sequence has to be started over again. All FIFO contents are cleared by the hardware and software power-down modes. power up and initialization Initialization requires: 1. Determine processor type by writing A000h to the TLC1514/18 2. Configure the device The first conversion after power up or resuming from power down is not valid. absolute maximum ratings over operating free-air temperature (unless otherwise noted)† Supply voltage range, GND to VCC –0.3 V to 6.5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Analog input voltage range –0.3 V to VCC + 0.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reference input voltage VCC + 0.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Digital input voltage range –0.3 V to VCC + 0.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating virtual junction temperature range, TJ –40 °C to 150°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating free-air temperature range, TA: TLC1514/18I –40 °C to 85°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage temperature range, Tstg –65 °C to 150°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260 °C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. recommended operating conditions MIN NOM MAX UNIT Supply voltage, VCC 4.5 5 5.5 V Positive external reference voltage input, VREFP (see Note 1) 2 VCC V Negative external reference voltage input, VREFM (note Note 1) 0 2 V Differential reference voltage input, VREFP – VREFM (see Note 1) 2 VCC VCC+0.2 V Analog input voltage (see Note 1) 0 VCC V High level control input voltage, VIH 2.1 V Low-level control input voltage, VIL 0.6 V Rise time, for CS, CSTART SDI at 0.5 pF, tr(I/O) 4.76 ns Fall time, for CS, CSTART SDI at 0.5 pF, tf(I/O) 2.91 ns Rise time, for INT, EOC, SDO at 30 pF, tr(Output) 2.43 ns Fall time, for INT, EOC, SDO at 30 pF, tf(Output) 2.3 ns NOTE 1: When binary output format is used, analog input voltages greater than that applied to REFP convert as all ones (1111111111), while input voltages less than that applied to REFM convert as all zeros (0000000000). The device is functional with reference down to 2 V (VREFP – VREFM –1); however, the electrical specifications are no longer applicable. |
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