DSC400 datasheet(6/20 Pages) MICROCHIP

6 / 20 page

DSC400

DS20005612A-page 6

 2016 Microchip Technology Inc.

4.0

TERMINATION SCHEMES

4.1

LVPECL

FIGURE 4-1:

Typical LVPECL Termination Scheme.

Note 1:

LVPECL applicable to extended commercial temperature only.

See the Output Waveform section for more information.

The addition of IDDCORE and IDDIO provides the total current consumption of the device.

Period jitter includes crosstalk from adjacent output.

VDD

100 Ω

130 Ω

82 Ω

130 Ω

82 Ω

TABLE 4-1:

LVPECL OUTPUTS (Note 1)

Parameter

Symbol

Min.

Typ.

Max.

Units

Condition

Output Logic

Levels

VOH

VDD – 1.08

—

Output Logic High, RL = 50Ω to VDD–2V

VOL

——

VDD – 1.55

Output Logic Low, RL = 50Ω to VDD–2V

Peak-to-Peak

Output Swing

—

800

—

Single-Ended

Output

Transition Time

(Note 2)

—

250

—

Rise Time. 20% to 80%; RL = 50Ω to

VDD–2V

—

250

—

Fall Time. 20% to 80%; RL = 50Ω to

VDD–2V

Frequency

2.3

—

460

MHz

Single Frequency

Output Duty

Cycle

SYM

—

Differential

IO Supply

Current (Note 3)

IDDIO

—

Per Output at 125 MHz

Period Jitter

(Note 4)

JPER

—2.5

—

psRMS CLK(0:3) = 156.25 MHz

Integrated

Phase Noise

JPH

—0.25—

psRMS 200 kHz to 20 MHz @ 156.25 MHz

—

0.38

—

100 kHz to 20 MHz @ 156.25 MHz

—

1.7

12 kHz to 20 MHz @ 156.25 MHz

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