LTC2641 datasheet(39/50 Pages) LINER

39 / 50 page

LTC2373-18

237318f

For more information www.linear.com/LTC2373-18

TiMing DiagraMs

Multiple Devices

Figure 27 shows the multiple LTC2373-18 devices operat-

ing and sharing CNV, SDI, SCK and SDO. By sharing CNV,

SDI, SCK and SDO, the number of signals required to

operate multiple ADCs in parallel is reduced. Since SDO is

shared, the RDL input of each ADC must be used to allow

only one LTC2373-18 to drive SDO at a time in order to

avoid bus conflicts. RDL must also be used to selectively

program each ADC through the shared SDI input line. The

RDLinputsidlehighandareindividuallybroughtlowtoread

data out of and selectively program each device between

conversions. When RDL is brought low, the MSB(D17)

of the selected device is output onto SDO.

Figure 27. Multiple Devices Sharing CNV, SCK and SDO

CNV

RESET = 0

NAP

RDLA

RDLB

BUSY

tCNVH

tCONV

CONVERT

NAP

tBUSYLH

SCK

SDO

237318 F27

tCNVL

CONVERT

tHSDISCK

tSSDISCK

tDSDO

tDIS

Hi-Z

tHSDO

tSCK

SDI

DON’T CARE

CA[7] CA[6] CA[5]

tQUIET

tSCKL

tSCKH

tEN

Hi-Z

D17A D16A D15A

D1A D0A

D17B D16B D15B

Hi-Z

D1B

D0B

CB[7]

CB[5]

CB[6]

CONVERT

DIGITAL HOST

IRQ

SDI

DATA IN

CLK

RDLB

RDLA

CNV

BUSY

SDI

SDO

SCK

RDL

RESET

LTC2373-18

CNV

BUSY

SDI

SDO

SCK

RDL

RESET

LTC2373-18

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