LTC2845 datasheet(6/20 Pages) LINER

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LTC2845

sn2845 2845fs

VCC (Pins 1, 19/Pins 17, 36): Positive Supply for the

Transceivers. Connect to VCC Pin 8 on LTC2846 or to 5V

supply. Connect a 1

µF capacitor to ground.

VDD (Pin 2/Pin 37): Positive Supply Voltage for V.28.

Connect to VDD Pin 7 on LTC2846 or 8V supply. Connect

a 1

µF capacitor to ground.

D1 (Pin 3/Pin 38): TTL Level Driver 1 Input.

D2 (Pin 4/Pin 1): TTL Level Driver 2 Input.

D3 (Pin 5/Pin 2): TTL Level Driver 3 Input.

R1 (Pin 6/Pin 3): CMOS Level Receiver 1 Output. Receiver

outputs have a weak pull up to VIN when high impedance.

R2 (Pin 7/Pin 4): CMOS Level Receiver 2 Output.

R3 (Pin 8/Pin 5): CMOS Level Receiver 3 Output.

D4 (Pin 9/Pin 6): TTL Level Driver 4 Input.

R4 (Pin 10/Pin 7): CMOS Level Receiver 4 Output.

M0 (Pin 11/Pin 8): TTL Level Mode Select Input 0. Mode

select inputs pull up to VIN.

M1 (Pin 12/Pin 9): TTL Level Mode Select Input 1.

M2 (Pin 13/Pin 10): TTL Level Mode Select Input 2.

DCE/DTE (Pin 14/Pin 12): TTL Level Mode Select Input.

Logic high enables Driver 3. Logic low enables Receiver 1.

D4ENB (Pin 15/Pin 13): TTL Level Enable Input. Logic low

enables Driver 4. Pulls up to VIN.

R4EN (Pin 16/Pin 14): TTL Level Enable Input. Logic high

enables Receiver 4. Pulls up to VIN.

R5 (Pin 17/Pin 15): CMOS Level Receiver 5 Output.

PIN FUNCTIONS

D5 (Pin 18/Pin 16): TTL Level Driver 5 Input.

VIN (Pin 20/Pin 18): Positive Supply for the Receiver

Outputs. 3V

≤ VIN ≤ 3.6V. Connect a 1µF capacitor to

ground.

D5 A (Pin 21/Pin 19): Driver 5 Inverting Output.

R5 A (Pin 22/Pin 20): Receiver 5 Inverting Input.

R4 A (Pin 23/Pin 21): Receiver 4 Inverting Input.

D4 A (Pin 24/Pin 22): Driver 4 Inverting Input.

R3 B (Pin 25/Pin 23): Receiver 3 Noninverting Input.

R3 A (Pin 26/Pin 24): Receiver 3 Inverting Input.

R2 B (Pin 27/Pin 25): Receiver 2 Noninverting Input.

R2 A (Pin 28/Pin 26): Receiver 2 Inverting Input.

D3/R1 B (Pin 29/Pin 27): Receiver 1 Noninverting Input

and Driver 3 Noninverting Output.

D3/R1 A (Pin 30/Pin 28): Receiver 1 Inverting Input and

Driver 3 Inverting Output.

D2 B (Pin 31/Pin 29): Driver 2 Noninverting Output.

D2 A (Pin 32/Pin 30): Driver 2 Inverting Output.

D1 B (Pin 33/Pin 31): Driver 1 Noninverting Output.

D1 A (Pin 34/Pin 32): Driver 1 Inverting Output.

GND (Pin 35/Pin 33): Ground.

VEE (Pin 36/Pins 34, 35): Negative Supply Voltage. Con-

nect to VEE Pin 31 on LTC2846 or to –7V supply. Connect

a 1

µF capacitor to ground.

EXPOSED Pad VEE (Pin 39): Must be Soldered to PCB.

(G-36/QFN-38 Packages)

LTC2845 Datasheet(PDF) 6 Page - Linear Technology

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