LTC2378-16
TiMing DiagraMs
Chain Mode, Multiple Devices
This is useful for applications where hardware constraints
may limit the numberoflines needed to interface toa large
number of converters. Figure 15 shows an example with
two daisy-chained devices. The MSꢀ of converter A will
appear at SDO of converter ꢀ after 16 SCK cycles. The
MSꢀ of converter A is clocked in at the SDꢁ/RDL pin of
converter ꢀ on the rising edge of the first SCK.
When CHAꢁI = OV , the LTC2378-16 operates in chain
DD
mode.ꢁnchainmode,SDOisalwaysenabledandRDL/SDꢁ
serves as the serial data input pin (SDꢁ) where daisy-chain
data output from another ADC can be input.
CONVERT
OV
OV
DD
DD
CNV
CNV
CHAIN
CHAIN
DIGITAL HOST
LTC2378-16
LTC2378-16
RDL/SDI
SDO
RDL/SDI
BUSY
SDO
IRQ
A
B
DATA IN
SCK
SCK
CLK
237816 F16a
POWER-DOWN
AND ACQUIRE
CONVERT
POWER-DOWN AND ACQUIRE
CONVERT
CHAIN = OV
DD
RDL/SDI = 0
A
t
CYC
t
CNVL
CNV
BUSY
t
CONV
t
BUSYLH
SCK
t
SCKCH
t
t
QUIET
SCKH
1
2
3
14
15
16
17
18
30
31
32
t
SCKL
t
t
HSDO
SSDISCK
t
t
DSDO
HSDISCK
SDO = RDL/SDI
A
B
D15
D14
D14
D13
D1
D0
D0
A
A
A
A
A
t
DSDOBUSYL
D15
D13
D1
B
D15
D14
D1
A
D0
A
SDO
B
B
B
B
A
A
B
237816 F15
Figure 1.0 Chain Mode Timing Diagram
237816f
18
LINEAR_DIMENSIONS [ Linear Dimensions ]
