Rainbow-electronics MAX9217 Manual de usuario descargar pdf (Pagina 9)

MAX9217

27-Bit, 3MHz-to-35MHz

DC-Balanced LVDS Serializer

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Detailed Description

The MAX9217 DC-balanced serializer operates at a

parallel clock frequency of 3MHz to 35MHz, serializing

18 bits of parallel video data RGB_IN[17:0] when the

data enable input DE_IN is high, or 9 bits of parallel

control data CNTL_IN[8:0] when DE_IN is low. The

RGB video input data are encoded using 2 overhead

bits, EN0 and EN1, resulting in a serial word length of

20 bits (Table 1). Control inputs are mapped to 19 bits

and encoded with 1 overhead bit, EN0, also resulting in

a 20-bit serial word. Encoding reduces EMI and main-

tains DC balance across the serial cable. Two transition

words, which contain a unique bit sequence, are insert-

ed at the transition boundaries of video-to-control and

control-to-video phases.

Control data inputs C0 to C4 are mapped to 3 bits each

in the serial control word (Table 2). At the deserializer,

2 or 3 bits at the same state determine the state of the

recovered bit, providing single bit-error tolerance for

C0 to C4. Control data that may be visible if an error

occurs, such as VSYNC and HSYNC, can be connect-

ed to these inputs. Control data inputs C5 to C8 are

mapped to 1 bit each.

OUT-

OUT+

((OUT+) + (OUT-)) / 2

OS(P-P)

012345678910111213141516171819

EN0 EN1 S0 S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17

Figure 8. Peak-to-Peak Output Offset Voltage

Bit 0 is the LSB and is serialized first. EN[1:0] are encoding bits. S[17:0] are encoded symbols.

Table 1. Serial Video Phase Word Format

012345678910111213141516171819

E N 0C0C0C0C1C1C1C2C2C2C3C3C3C4C4C4C5C6C7C8

Bit 0 is the LSB and is serialized first. C[8:0] are the control inputs.

Table 2. Serial Control Phase Word Format

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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Rainbow-electronics MAX9217 Manual de usuario Pagina 9