LTC2382-16_15 Datasheet, PDF (18/24 Pages) Linear Technology – 16-Bit, 500ksps, Low Power SAR ADC with Serial Interface

LTC2382-16
TIMING DIAGRAM
When CHAIN = OV_DD, the LTC2382-16 operates in Chain
Mode. In Chain Mode, SDO is always enabled and RDL/SDI
serves as the serial data input pin (SDI) where daisychain
data output from another ADC can be input.
This is useful for applications where hardware constraints
may limit the number of lines needed to interface to a large
number of converters. Figure 14 shows an example with
two daisy chained devices. The MSB of converter A will
appear at SDO of converter B after 16 SCK cycles. The
MSB of converter A is clocked in at the SDI/RDL pin of
converter B on the rising edge of the first SCK.
OV_DD
CHAIN ^CNV
LTC2382-16
RDL/SDI
SDO
A
SCK
OV_DD
CHAIN ^CNV
LTC2382-16
RDL/SDI
B
SCK
BUSY
SDO
CONVERT
DIGITAL HOST
IRQ
DATA IN
ACQUIRE
CHAIN = OV_DD
RDL/SDI_A = 0
CONVERT
CNV
BUSY
t_BUSYLH
t_HOLD
t_CONV
SCK
SDO_A = RDL/SDI_B
SDO_B
t_DSDOBUSYL
POWER-DOWN
ACQUIRE
t_CYC
CLK
238216 F14a
POWER-UP
t_CNVL
1
2
3
t_SSDISCK
t_HSDISCK
D15_A D14_A D13_A
t_SCKCH
t_SCKH
14
15
16
17
18
30
31
32
t_HSDO
t_DSDO
D1_A D0_A
t_SCKL
D15_B D14_B D13_B
D1_B D0_B D15_A D14_A
Figure 14. Chain Mode Timing Diagram
D1_A
D0_A
CONVERT
238216 F14
238216f
18