TLC3545IDRG4 datasheet(16/23 Pages) TI

16 / 23 page

TLC3541, TLC3545

SLAS345 − DECEMBER 2001

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PRINCIPLES OF OPERATION

pseudo-differential inputs

The TLC3545 operates in pseudo-differential mode. The inverted input is available on pin 5. The inverted input

can tolerate a maximum input ripple of

±0.2 V. It is normally used for zero-scale offset cancellation or ground

noise rejection.

serial interface

Output data format is binary (unipolar straight binary).

binary

D Zero-Scale Code = 0000h, VAIN = GND

D Full-Scale Code = 3FFFh, VAIN = VREF – 1 LSB

reference voltage

An external reference must be applied via pin 2, VREF. The voltage level applied to this pin establishes the upper

limit of the analog inputs to produce a full-scale reading. The value of VREF, and the analog input should not

exceed the positive supply or be less than GND, consistent with the specified absolute maximum ratings. The

digital output is at full scale when the input signal is equal to or higher than VREF and at zero when the input

signal is equal to or less than GND.

auto-power down and power up

Auto-power down is built into the devices in order to reduce power consumption. The wake-up time is fast

enough to provide power down between each conversion cycle. The power-down state is initiated at the end

of conversion and wakes up on a falling CS edge (or rising FS edge, whichever occurs first, for TLC3541 only).

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