LTC2995 datasheet(11/90 Pages) AD

11 / 90 page

LTM2985

Rev. 0

For more information www.analog.com

PIN FUNCTIONS

Logic Side

DOUT (B1): Digital Output, Referenced to VL and GND.

Logic output connected to DIN through isolation barrier.

Under the condition of an isolation communication failure

this output is in a high impedance state.

SDO (A2): Serial SPI Digital Output, Referenced to VL and

GND. Under the condition of an isolation communication

failure this output is in a high impedance state.

SCK (A3): Serial SPI Clock Input, Referenced to VL and

GND. Do not float.

SDI (A4): Serial SPI Data Input, Referenced to VL and

GND. Do not float.

CS (A5): Serial SPI Chip Select, Referenced to VL and

GND. Do not float.

SDOE (A6): Serial SPI Data Output Enable, Referenced to

VL and GND. A logic high on SDOE places the logic side

SDO pin in a high impedance state, a logic low enables

the output. Do not float. For multiple SPI devices on the

same bus connect SDOE to CS, otherwise tie to GND.

ON (A7): Enable. Enables power and data communica-

tion through the isolation barrier. If ON is high, the part

is enabled and power and communications are functional

to the isolated side. If ON is low, the logic side is held in

reset, all digital outputs are in a high impedance state and

the isolated side is unpowered. Do not float.

VL (A8, B8): Logic Supply. Interface supply voltage for

pins SDI, SCK, SDO, DOUT, CS, SDOE and ON. Operating

voltage is 1.62V to 5.5V. Internally bypassed with 2.2μF

to GND.

GND (A9, B2 to B7, B9, C1 to C11 ): Circuit Ground.

VCC(A10,A11,B10,B11):IsolatedAnalogPowerSupply.

Internally bypassed with 2.2μF to GND.

DNC (A1): Do Not Connect. Pin connected internally.

Isolated Side

VCC2(R11):5VNominalIsolatedSupplyVoltage.Internally

generated from VCC by an isolated DC/DC converter and

regulated to 5V. Internally bypassed with 2.2μF to GND2.

DIN (T3): Digital Input, Referenced to VCC2 and GND2.

Logic input connected to DOUT through isolation barrier.

The logic state on DIN translates to the same logic state

on DOUT (Do not float).

INT (T2): Interrupt. Transitions from LOW to HIGH once

the conversion is complete. Can be sent to logic side by

shorting to DIN.

GND2 (R8, S6, S8, R10, R3, S3, T1): Isolated Ground.

VREF (S11): Reference output pin. Internally bypassed

with 10µF to GND. Do not load this pin.

DNC (R1, R2, R9,S1, S2, S9, S10, T8, T9, T10, T11):

Do Not Connect. Pin connected internally.

CH1–CH10 (R7, R6, R5, R4, S4, T4, T5, T6, T7, S7 ):

Analog Inputs. May be programmed for single-ended,

differential, or ratio-metric operation. The voltage on

these pins can have any value between GND2 – 50mV and

VCC2 – 0.3V. Unused pins can be grounded or left floating.

COM (S5): Common input, this is the negative input pin

for all single ended operations.

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