LTC1992 datasheet(16/24 Pages) LINER

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LTC2369-18

236918fa

TIMING DIAGRAMS

Figure 11. Normal Mode With Multiple Devices Sharing CNV, SCK and SDO

Normal Mode, Multiple Devices

Figure 11 shows multiple LTC2369-18 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 LTC2369-18 to drive SDO at a

time in order to avoid bus conflicts. As shown in Figure 11,

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.

236918 F11

D17A

SDO

SCK

CNV

BUSY

CHAIN = 0

RDL/SDIB

RDL/SDIA

D17B

D16B

D1B

D0B

D15B

D16A

D15A

D1A

D0A

Hi-Z

tEN

tHSDO

tDSDO

tDIS

tSCKL

tSCKH

tCNVL

tSCK

CONVERT

tQUIET

tCONV

tBUSYLH

POWER-DOWN AND ACQUIRE

POWER-DOWN

AND ACQUIRE

RDLB

RDLA

CONVERT

IRQ

DATA IN

DIGITAL HOST

CLK

CNV

LTC2369-18

SDO

SCK

RDL/SDI

CNV

LTC2369-18

SDO

SCK

RDL/SDI

CHAIN

BUSY

CHAIN

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