LTM2893 datasheet(9/32 Pages) LINER

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LTM2893/LTM2893-1

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SB (C5): Select Enable Input B. Select signal pass through

to SB2 to control an external multiplexer or programmable

gain amplifier. Transitions must not occur just before the

beginning of a CNV or SS edge. See the Safe Regions of

the Select Enable Signals section for timing constraints.

Do not use as a general purpose asynchronous signal. SB

containsaweakpulldown.ConnecttoGNDwhennotused.

SC (C6): Select Enable Input C. Select signal pass through

to SC2 to control an external multiplexer or programmable

gain amplifier. Transitions must not occur just before the

beginning of a CNV or SS edge. See the Safe Regions of

the Select Enable Signals section for timing constraints.

Do not use as a general purpose asynchronous signal. SC

containsaweakpulldown.ConnecttoGNDwhennotused.

Isolated Side

(All Inputs and Outputs Referenced to VL2 and GND2)

VCC2 (N1): Isolated Voltage Supply. Recommended op-

erating voltage is 3.0V to 5.5V. Internally bypassed to

GND2 with 1µF.

GND2 (N2,N3): Isolated Ground Return. Keep separate

from GND.

SA2(N4):SelectOutputA.Selectsignalpassthroughfrom

SAtocontrolanexternalmultiplexerorprogrammablegain

amplifier. See Figure 12 for timing constraints. Do not use

as a general purpose asynchronous signal. SA2 contains

a weak pull-down. Leave unconnected when not used, or

connect to GND2 if unused and configured as an input.

SB2(N5):SelectOutputB.Selectsignalpassthroughfrom

SBtocontrolanexternalmultiplexerorprogrammablegain

amplifier. See Figure 12 for timing constraints. Do not use

as a general purpose asynchronous signal. SB2 contains

a weak pull-down. Leave unconnected when not used, or

connect to GND2 if unused and configured as an input.

SC2(N6):SelectOutputC.Selectsignalpassthroughfrom

SCtocontrolanexternalmultiplexerorprogrammablegain

amplifier. See Figure 12 for timing constraints. Do not use

as a general purpose asynchronous signal. SC2 contains

a weak pull-down. Leave unconnected when not used, or

connect to GND2 if unused and configured as an input.

PIN FUNCTIONS

VL2(P1):InterfaceSupplyVoltage.Recommendedoperat-

ing voltage is 1.71V to 5.5V. Interface supply voltage for

pins SA2, SB2, SC2, MISOA2, MISOB2, MOSI2, SCLK2,

SS2, BUSYS, BUSY2, and CNV2. Internally bypassed to

GND2 with 1µF. Connect to the ADC SPI interface supply.

MISOA2 (P2): Master In Slave Out A Input. Serial data

input receiving the results from the ADC. MISOA2 has a

weak pull-down when ON2 is high.

MISOB2 (P3): Master In Slave Out B Input. Serial data

input receiving the results from the ADC. MISOB2 has

a weak pull-down when ON2 is high. Connect to GND2

when not used.

VL2 (P4): Connect to VL2.

GND2 (P5): Connect to GND2.

BUSYS(P6):SecondaryBusyInput.Connecttosecondary

ADC BUSY output when two or more ADCs are connected

in parallel. Connect to CNV2 to avoid ADC sleep functions.

Connect to GND2 when unused.

ON2 (R1): Isolated Enable Input. A high input enables the

isolatedsidecommunicationinterface.DoNotFloat.When

ON2 is low and VL2 is high, CNV2, MOSI2, SCK2, MISOA2

and MISOB2 are high impedance, an external pull-up or

pull-down resistor (100k or greater) is required on each

pin to minimize possible internal shoot though current if

these pins float.

SS2 (R2): Isolated Side Slave Select Output (Slave Chip

Select).Outputcontrolledbyinternalcommunicationfunc-

tions to fetch data from slave ADC. Connect to external

ADC as necessary.

MOSI2 (R3): Isolated Master Out Slave In 2 Output.

LTM2893-1 only, serial data output sending command

data to the ADC. LTM2893, connect MOSI2 to GND2.

SCK2(R4):IsolatedSerialClockOutput.Serialclockoutput

to the ADC. SCK2 is low when SS2 is high.

BUSY2 (R5): Isolated Busy Input. Connect to Primary ADC

BUSY output. Connect to CNV2 to use fast ADC read mode

(ADC sample rate up to 2Msps).

CNV2 (R6): Isolated Conversion Start Output. Connect to

ADC conversion start input.

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