LTC6754

19

6754f

For more information www.linear.com/LTC6754

Short Pulse to Differential Cable Driver and CMOS

Output Receiver

Figure 19 shows a low amplitude short duration pulse

being transmitted over 8 feet of Cat6 differential cable and

converted to a full level CMOS output signal. The pulse

is applied to the input of an LTC6754. A 150Ω resistor is

used along with the 1pF input capacitance of the LTC6754

to limit the rise time at the positive input of the LTC6754,

in order to minimize coupling between the input and other

nodes in the system.

The LTC6754 is used to drive 8 feet of cable terminated

in a 100Ω resistive load at the inputs of an LTC6752-2,

whichgeneratesafullscaleCMOSlogicsignalatitsoutput.

Typical applicaTions

50

50

CMOS

OUTPUT

0.1µF

–

+

3V

6754 F19

VCC

LTC6752-2

VDD

VEE

+IN

–IN

150

–

+

3V

6754 F11

VCCI

LTC6754

VCCO

VEE

Q

Q

VREF = 200mV

+IN

–IN

RJ45

RJ45

5ns

0V

CAT6 CABLE 8ft

PULSE INPUT

400mV

DIFFERENTIAL

PULSE TRANSMITTER

Q

Figure 19. Short Pulse to Differential Cable Driver and CMOS Output Receiver

2ns/DIV

PULSE INPUT

200mV/DIV

0V

CMOS OUTPUT

1V/DIV

0V

6754 F20

Figure 20. Pulse Input and Output