TLC2543-Q1 Datasheet, PDF (14/24 Pages) Texas Instruments – 12-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS

TLC2543ĆQ1
ą
12ĆBIT ANALOGĆTOĆDIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 ANALOG INPUTS
SGLS218B − NOVEMBER 2003 − REVISED NOVEMBER 2004
PRINCIPLES OF OPERATION
data input
The data input is internally connected to an 8-bit serial-input address and control register. The register defines
the operation of the converter and the output data length. The host provides the data word with the MSB first.
Each data bit is clocked in on the rising edge of the I/O CLOCK sequence (see Table 2 for the data input-register
format).
Table 2. Input-Register Format
FUNCTION SELECT
Select input channel
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
AIN9
AIN10
Select test voltage
(Vref ₊ − Vref _−)/2
Vref _−
Vref ₊
Software power down
Output data length
8 bits
12 bits
16 bits
Output data format
MSB first
LSB first (LSBF)
Unipolar (binary)
Bipolar (BIP) 2s complement
† _{X represents a do not care condition.}
data input address bits
INPUT DATA BYTE
ADDRESS BITS
L1 L0
D7
D6 D5 D4 D3 D2
(MSB)
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
0
1
X†
0
1
1
LSBF BIP
D1 D0
(LSB)
0
1
0
1
The four MSBs (D7 − D4) of the data register address one of the 11 input channels, a reference-test voltage,
or the power-down mode. The address bits affect the current conversion, which is the conversion that
immediately follows the current I/O cycle. The reference voltage is nominally equal to V_ref+ − V_{ref −}.
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