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TLC1542IN Fiches technique(PDF) 7 Page - Texas Instruments

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No de pièce TLC1542IN
Description  10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TLC1542IN Fiches technique(HTML) 7 Page - Texas Instruments

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TLC1542C, TLC1542I, TLC1542M, TLC1542Q, TLC1543C, TLC1543I, TLC1543Q
10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH
SERIAL CONTROL AND 11 ANALOG INPUTS
SLAS052E – MARCH 1992 – OCTOBER 1998
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
converter and analog input (continued)
With each step of the successive-approximation process, the initial charge is redistributed among the
capacitors. The conversion process relies on charge redistribution to count and weigh the bits from MSB to LSB.
SC
Threshold
Detector
Node 512
REF –
REF+
ST
512
VI
To Output
Latches
REF+
REF+
REF+
REF+
1
2
4
8
16
128
256
1
REF+
REF+
REF –
REF –
REF –
REF –
REF –
REF –
REF –
REF –
ST
ST
ST
ST
ST
ST
ST
ST
Figure 1. Simplified Model of the Successive-Approximation System
chip-select operation
The trailing edge of CS starts all modes of operation, and CS can abort a conversion sequence in any mode.
A high-to-low transition on CS within the specified time during an ongoing cycle aborts the cycle, and the device
returns to the initial state (the contents of the output data register remain at the previous conversion result).
Exercise care to prevent CS from being taken low close to completion of conversion because the output data
can be corrupted.
reference voltage inputs
There are two reference inputs used with the device: REF + and REF –. These voltage values establish the upper
and lower limits of the analog input to produce a full-scale and zero reading respectively. The values of REF +,
REF –, and the analog input should not exceed the positive supply or be lower 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 REF + and at zero when the input signal is equal to or lower than REF –.


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