Rainbow-electronics MAX9216 Manual de usuario descargar pdf (Pagina 8)

MAX9210/MAX9212/MAX9214/MAX9216/MAX9220/MAX9222

Programmable DC-Balance

21-Bit Deserializers

8 _______________________________________________________________________________________

channel is five. Limiting the DSV and choosing the cor-

rect coupling capacitors maintains differential signal

amplitude and reduces jitter due to droop on AC-cou-

pled links.

To obtain DC balance on the data channels, the serial-

izer parallel data is inverted or not inverted, depending

on the sign of the digital sum at the word boundary.

Two complementary bits are appended to each group

of 7 parallel input data bits to indicate to the MAX9210/

MAX9212/MAX9214/MAX9216/MAX9220/MAX9222

deserializers whether the data bits are inverted (see

Figures 9 and 10). The deserializer restores the original

state of the parallel data. The LVDS clock signal alter-

nates duty cycles of 4/9 and 5/9, which maintain DC

balance.

TxIN_ IS DATA FROM THE SERIALIZER.

TxIN1

TxIN7TxIN8

TxIN14TxIN15

CYCLE N + 1CYCLE NCYCLE N - 1

TxIN2TxIN6 TxIN3TxIN4TxIN5

TxIN9TxIN13 TxIN10TxIN11TxIN12

TxIN0TxIN1TxIN2TxIN6 TxIN3TxIN4TxIN5

TxIN7TxIN8TxIN9TxIN13 TxIN10TxIN11TxIN12

TxIN14TxIN15TxIN16TxIN20 TxIN17TxIN18TxIN19

TxIN0TxIN1

TxIN7TxIN8

TxIN14TxIN15TxIN16TxIN20 TxIN17TxIN18TxIN19

TxIN0

RxCLK IN

RxIN1

RxIN0

RxIN2

Figure 9. Deserializer Serial Input in Non-DC-Balanced Mode

TxIN_, DCA_, AND DCB_ ARE DATA FROM THE SERIALIZER.

DCA0

DCB1DCA1

DCB2DCA2

CYCLE N + 1CYCLE NCYCLE N - 1

TxIN2TxIN6 TxIN3TxIN4TxIN5

TxIN9TxIN13 TxIN10TxIN11TxIN12

TxIN2TxIN3TxIN4DCA0 TxIN5TxIN6DCB0

TxIN9TxIN10TxIN11DCA1 TxIN12TxIN13DCB1

TxIN16TxIN17TxIN18DCA2 TxIN19TxIN20DCB2

TxIN0TxIN1

TxIN7TxIN8

TxIN14TxIN15TxIN16TxIN20 TxIN17TxIN18TxIN19

DCB0

RxCLK IN

RxIN1

RxIN0

RxIN2

TxIN1

TxIN8

TxIN15

TxIN0

TxIN7

TxIN14

Figure 10. Deserializer Serial Input in DC-Balanced Mode

0.8V

PWRDWN

RxCLK IN

RxOUT_

RxCLK OUT

RPDD

HIGH-Z

Figure 8. Power-Down Delay

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 16 17

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Rainbow-electronics MAX9216 Manual de usuario Pagina 8

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