
LTC2379-18
16
237918fa
TIMING DIAGRAMS
Normal Mode, Single Device
When CHAIN = 0, the LTC2379-18 operates in normal
mode. In normal mode, RDL/SDI enables or disables the
serial data output pin SDO. If RDL/SDI is high, SDO is in
high impedance. If RDL/SDI is low, SDO is driven.
Figure 13 shows a single LTC2379-18 operated in normal
mode with CHAIN and RDL/SDI tied to ground. With RDL/
SDI grounded, SDO is enabled and the MSB(D17) of the
new conversion data is available at the falling edge of
BUSY. This is the simplest way to operate the LTC2379-18.
CNV
LTC2379-18
BUSY
CONVERT
IRQ
DATA IN
DIGITAL HOST
CLK
SDO
SCK
238018 F13a
RDL/SDI
CHAIN
237918 F13
CONVERT
tACQ
tACQ = tCYC – tCONV – tBUSYLH
POWER-DOWN AND ACQUIRE
POWER-DOWN
AND ACQUIRE
CNV
CHAIN = 0
BUSY
SCK
SDO
RDL/SDI = 0
tBUSYLH
tDSDOBUSYL
tSCK
tHSDO
tSCKH
tQUIET
tSCKL
tDSDO
tCONV
tCNVH
tCYC
tCNVL
D17
D16
D15
D1
D0
12
3
16
17
18
Figure 13. Using a Single LTC2379-18 in Normal Mode