DDC114IRTCT Datasheet, PDF (22/35 Pages) Texas Instruments – Quad Current Input, 20-Bit Analog-To-Digital Converter

DDC114
SBAS255C − JUNE 2004 − REVISED APRIL 2009
SPECIAL CONSIDERATIONS
Cascading Multiple Converters
Multiple DDC114 units can be connected in serial
configuration, as illustrated in Figure 21.
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DOUT can be used with DIN to daisy-chain several
DDC114 devices together to minimize wiring. In this mode
of operation, the serial data output is shifted through
multiple DDC114s, as illustrated in Figure 21.
See Figure 22 for the timing diagram when the DIN input
is used to daisy-chain several devices. Table 11 gives the
timing specification for data retrieval using DIN.
Data Clock
Data Retrievel
Outputs
DOUT _DDC114 DIN
DOUT
DIN
DOUT _DDC114 DIN
DOUT
D IN
DOUT _DDC114 DIN
DOUT
DIN
Sensor A B C D
E FGH
I JKL
Figure 21. Daisy-Chained DDC114s
CLK
t₁₈
DVALID
t₂₀
t₂₀
t₁₉
DCLK
t₂₁
t₂₂
t₂₃
DIN
DOUT
Input A
MSB
Input A Input B
LSB MSB
Input F Input G
LSB MSB
Input K Input L
LSB MSB
Input L
LSB
Input A
MSB
Figure 22. Timing Diagram When Using the DIN Function of the DDC114
SYMBOL
t₂₂
t₂₃
22
Table 11. Timing for the DDC114 Data Retrieval Using DIN
DESCRIPTION
MIN
TYP
MAX
Set-Up Time From DIN to Falling Edge of DCLK
5
Hold Time For DIN After Falling Edge of DCLK
4
UNITS
ns
ns