DDC316 Datasheet, PDF (18/24 Pages) Texas Instruments – 16-Channel, Current-Input Analog-to-Digital Converter

DDC316
SBAS370 – MARCH 2008 .................................................................................................................................................................................................. www.ti.com
READBACK WITH MULTIPLE DDC316s
The serial interface supports daisy-chaining to
simplify connections when using multiple DDC316s
together. Figure 12 shows an example of a
64-channel system. The DIN pin is used to shift data
into the DDC316s. Additional DCLK pulses must then
be given during readback to ensure all the data have
shifted through, as shown in Figure 13.
Note that daisy-chaining is only supported in TDM
output mode, and will not work when using parallel
data output mode. When the daisy-chaining function
is not used, connect DIN to digital ground.
Data Clock
Data
Retrieval DOUT1 DDC316 DIN DOUT1 DDC316 DIN DOUT1 DDC316 DIN DOUT1 DDC316 DIN
Output
Sensor
DVALID
Figure 12. Daisy-Chain Configuration of a 64-Channel System
DCLK
DIN
t_STDIDC
t_HDDIDC
DOUT
Input
64
MSB
Input
64
LSB
Input
63
MSB
Input 3 Input 2
LSB MSB
Input 2 Input 1
LSB MSB
Input 1
LSB
Input
64
MSB
Figure 13. Daisy-Chain Readback of Four Devices (64 Channels)
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