DDC232_17 Datasheet, PDF (21/34 Pages) Texas Instruments – 32-Channel, Current-Input Analog-to-Digital Converter

DDC232
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Cascading Multiple Converters
Multiple DDC232 units can be connected in serial
configuration; see Figure 18.
DOUT can be used with DIN to daisy-chain multiple
DDC232 devices together to minimize wiring. In this
mode of operation, the serial data output is shifted
through multiple DDC232s; see Figure 18.
SBAS331D – AUGUST 2004 – REVISED APRIL 2010
Figure 19 shows the timing diagram when the DIN
input is used to daisy-chain several devices. Table 14
gives the timing specification for data retrieval using
DIN.
Data Clock
Data
Retrieval DOUT DDC232
DIN DOUT DDC232
DIN DOUT DDC232
DIN DOUT DDC232
DIN
Output
Sensor
CLK
DVALID
Figure 18. Daisy-Chained DDC232s
DCLK
DIN
t_STDIDC
t_HDDIDC
DOUT
Input
128
MSB
Input
128
LSB
Input
127
MSB
Input 3 Input 2
LSB MSB
Input 2 Input 1
LSB MSB
Input 1
LSB
Figure 19. Timing When Using DDC232 DIN Function; See Figure 18
Table 14. Timing for DDC232 Data Retrieval Using DIN
SYMBOL
t_STDIDC
t_HDDIDC
DESCRIPTION
Set-Up Time from DIN to Falling Edge of DCLK
Hold Time for DIN After Falling Edge of DCLK
MIN
TYP
10
10
MAX
Input
128
MSB
UNITS
ns
ns
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