LTM2887 datasheet(15/30 Pages) AD

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LTM2810

Rev. A

For more information www.analog.com

APPLICATIONS INFORMATION

Figure 5. Supplies are Independent

Overview

The LTM2810 digital µModule isolator provides a gal-

vanically-isolated robust logic interface, complete with

decoupling capacitors. The LTM2810 is ideal for use in

networks where grounds can take on different voltages.

Isolation in the LTM2810 blocks high voltage differences

and eliminates ground loops, and is extremely tolerant of

common mode transients between ground planes. Error-

freeoperationismaintainedthroughcommonmodeevents

as fast as 50kV/μs providing excellent noise isolation.

Input Supply (VCC)

The LTM2810 is powered by a 3V to 5.5V supply on the

logic side of the isolation interface. The input supply

provides power to the internal isolated communications

interface and is completely independent of either the logic

power supply or bridge driver supply. VCC is bypassed

internally with a 1µF ceramic capacitor.

Bridge Driver Supply (PVCC)

The integrated bridge driver is powered by a 3V to 5.5V

supply on the logic side of the isolation interface. The

bridge driver may be disabled by tying PVCC to GND. PVCC

is bypassed internally with a 2.2µF ceramic capacitor.

LDO Input Supply (VIN)

The isolated side includes an integrated LDO powered by

VIN, with a nominal output voltage of 5V on VL2. Input

operating range is 4V to 38V. VIN is bypassed internally

with a 0.1µF ceramic capacitor. VIN may be grounded or

left unconnected if VL2 is driven by an external supply.

Logic Supplies (VL, VL2)

Separate logic supply pins, VLandVL2,allowtheLTM2810

to interface with any logic signal from 1.62V to 5.5V on

the logic side of the SPI/Digital version, 3V to 5.5V for the

logic and isolated sides of the I2C version and isolated side

of the SPI/Digital version, as shown in Figure 5.

VCC

PVCC

VIN

VL2

GND

LTM2810-S

GROUNDED OR OPEN

3V TO 5.5V INPUT

GND2

VCC

PVCC

VIN

AVL2

OPTIONAL

3.6V TO 38V INPUT

3V TO 5.5V

1.62V TO 5.5V

OPTIONAL

3V TO 5.5V OUTPUT

VL2 = 0.6V(1 + R2/R1)

VL2

GND

LTM2810-I

GND2

2810 F05

LTM2887 Datasheet(PDF) 15 Page - Analog Devices

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