
LTC2382-16
17
238216f
TIMING DIAGRAM
238216 F13a
RDL2
RDL1
CONVERT
IRQ
DATA IN
DIGITAL HOST
CLK
CNV
LTC2382-16
SDO
A
SCK
RDL/SDI
CNV
LTC2382-16
SDO
B
SCK
RDL/SDI
CHAIN
BUSY
CHAIN
238216 F13
D15A
SDO
SCK
CNV
BUSY
CHAIN = 0
RDL/SDIB
RDL/SDIA
D15B
D14B
D1B
D0B
D13B
D14A
D13A
D1A
D0A
Hi-Z
tEN
tHSDO
tDSDO
tDIS
tSCKL
tSCKH
tCNVL
tHSCKRDL
tSSCKRDL
12
3
14
15
16
17
18
19
30
31
32
tSCK
POWER-UP
CONVERT
POWER-DOWN
CONVERT
ACQUIRE
tCONV
tHOLD
tBUSYLH
Figure 13. Normal Mode with Multiple Devices Sharing CNV, SCK and SDO
Normal Mode, Multiple Devices
Figure 13 shows multiple LTC2382-16 devices operating
in Normal Mode(CHAIN = 0) sharing CNV, SCK and SDO.
By sharing CNV, SCK and SDO, the number of required
signals to operate multiple ADCs in parallel is reduced.
Since SDO is shared, the RDL/SDI input of each ADC must
be used to allow only one LTC2382-16 to drive SDO at a
time in order to avoid bus conflicts. As shown in Figure 13,
the RDL/SDI inputs idle high and are individually brought
low to read data out of each device between conversions.
When RDL/SDI is brought low, the MSB of the selected
device is output onto SDO. To ensure the MSB is properly
output and captured, SCK must be held low at least 1ns
before and 16ns after bringing RDL/SDI low.