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TLC540IDWRG4 Fiches technique(PDF) 10 Page - Texas Instruments

No de pièce TLC540IDWRG4
Description  8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 INPUTS
Download  19 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

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TLC540I, TLC541I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 INPUTS
SLAS065B – OCTOBER 1983 – REVISED JUNE 2001
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
It is possible to connect SYSTEM CLOCK and I/O clock together in special situations in which controlling circuitry
points must be minimized. In this case, the following special points must be considered in addition to the requirements
of the normal control sequence previously described.
1.
The first two clocks are required for this device to recognize CS is at a valid low level when the common clock
signal is used as an I/O CLOCK. When CS is recognized by the device to be at a high level, the common clock
signal is used for the conversion clock also.
2.
A low CS must be recognized before the I/O CLOCK can shift in an analog channel address. The device
recognizes a CS transition when the SYSTEM CLOCK terminal receives two positive edges and then a
negative edge. For this reason, after a CS negative edge, the first two clock cycles do not shift in the address.
Also, upon shifting in the address, CS must be raised after the eighth valid (10 total) I/O CLOCK. Otherwise,
additional common clock cycles are recognized as I/O CLOCKS and will shift in an erroneous address.
For certain applications, such as strobing applications, it is necessary to start conversion at a specific point in time.
This device accommodates these applications. Although the on-chip sample and hold begins sampling upon the
negative edge of the fourth valid I/O clock cycle, the hold function is not initiated until the negative edge of the eighth
valid I/O clock cycle. Thus, the control circuitry can leave the I/O clock signal in its high state during the eighth valid
I/O clock cycle until the moment at which the analog signal must be converted. The TLC540/TLC541 continues
sampling the analog input until the eighth falling edge of the I/O clock. The control circuitry or software then
immediately lowers the I/O clock signal and holds the analog signal at the desired point in time and start conversion.
Detailed information on interfacing to most popular microprocessors is readily available from the factory.


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