Atmel AT7910E Instrukcja Użytkownika Pobierz pdf (Strona 10)

AT7910E [DATASHEET]

7796G AERO 02/13

4. LVDS Interface

The AT7910E provides 8 SpaceWire link based on LVDS IOs that should comply with the EIA-644 standard

requirements.

The basic LVDS interface consists in a single differential link interconnected between a transmiter and a receiver.

Such a link requires a termination resistor on the receiver side to allow high frequency transfer usage. The nominal

resistor value for the termination resistor 100 ohms. LVDS bidirectional communication principle

Figure 4-1. LVDS interface principle

Caution: The AT7910E doesn’t embed the termination resistors on the receivers.

4.1 AT7910E Limitation

Due to MH1RT technology limitation, the electrical parameters of the EIA-644 standard can not all be met on the

transmitters of the AT7910E

Figure 4-2. Output electrical characteristics

Table 4-1. AT7910E LVDS TX feature

Parameter

TIA/EIA

Standard

AT7910E

Unit

VOS min

1125

800

VOS max

1375

1568

VOD Min

247

VOD Max

454

550

DeltaVOD

DeltaVOS

(dynamic)

150

200

Voh

Vol

Vod

Gnd

Vos

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 20 21

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