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TLV2543C Datasheet(PDF) 5 Page - Texas Instruments

Part # TLV2543C
Description  12-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TLV2543C Datasheet(HTML) 5 Page - Texas Instruments

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TLV2543C, TLV2543I
12-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 ANALOG INPUTS
SLAS096B – MARCH 1995 – REVISED OCTOBER 1995
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
data input (continued)
Table 1. Input-Register Format
INPUT DATA BYTE
FUNCTION SELECT
ADDRESS BITS
L1
L0
LSBF
BIP
FUNCTION SELECT
D7
(MSB)
D6
D5
D4
D3
D2
D1
D0
(LSB)
Select input channel
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
AIN9
AIN10
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
Select test voltage
(Vref + – Vref –)/2
Vref –
Vref +
1
1
1
0
1
1
1
0
0
1
0
1
Software power down
1
11
0
Output data length
8 bits
12 bits
16 bits
0
X
1
1
0
1
Output data format
MSB first
LSB first
0
1
Unipolar (binary)
0
Bipolar (BIP, 2s complement)
1
data input address bits
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 Vref+ – Vref–.
data output length
The next two bits (D3 and D2) of the data register select the output data length. The data-length selection is
valid for the current I/O cycle (the cycle in which the data is read). The data-length selection, which is valid for
the current I/O cycle, allows device start-up without losing I/O synchronization. A data length of 8, 12, or 16 bits
can be selected. Since the converter has 12-bit resolution, a data length of 12 bits is suggested.
With D3 and D2 set to 00 or 10, the device is in the 12-bit data-length mode and the result of the current
conversion is output as a 12-bit serial-data stream during the next I/O cycle. The current I/O cycle must be
exactly 12 bits long for proper synchronization, even when this means corrupting the output data from a previous
conversion. The current conversion is started immediately after the twelfth falling edge of the current I/O cycle.
With bits D3 and D2 set to 11, the 16-bit data-length mode is selected, which allows convenient communication
with 16-bit serial interfaces. In the 16-bit mode, the result of the current conversion is output as a 16-bit
serial-data stream during the next I/O cycle with the four LSBs always set to 0 (pad bits). The current I/O cycle
must be exactly 16 bits long to maintain synchronization even when this means corrupting the output data from
the previous conversion. The current conversion is started immediately after the sixteenth falling edge of the
current I/O cycle.


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