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

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.

–0.3 V to 6.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Analog input voltage range

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reference input voltage

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Digital input voltage range

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–40

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–40

°C to 85°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–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.