AD8159ASVZ datasheet(16/24 Pages) AD

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AD8159

Rev. A | Page 16 of 24

Table 6. IN_C Port Input Equalization Settings

Table 10. OUT_A Port Output Pre-Emphasis Settings

EQ_C

Typical Backplane Length

Typical

Backplane

Length

6 dB

0 to 20 inches

PE_A[1]

PE_A[0]

Overshoot

12 dB

20 to 40+ inches

0 dB

0 to 10 inches

Table 7. IN_A Port Input Equalization Settings

EQ_A

Typical Backplane Length

6 dB

0 to 20 inches

12 dB

20 to 40+ inches

Table 8. IN_B Port Input Equalization Settings

EQ_B

Typical Backplane Length

6 dB

0 to 20 inches

12 dB

20 to 40+ inches

Table 9. OUT_C Port Output Pre-Emphasis Settings

PE_C[1]

PE_C[0]

Overshoot

Typical

Backplane

Length

0 dB

0 to 10 inches

1.9 dB

15%

10 to 20 inches

3.5 dB

35%

20 to 30 inches

4.9 dB

60%

30 to 40+ inches

1.9 dB

15%

10 to 20 inches

3.5 dB

35%

20 to 30 inches

4.9 dB

60%

30 to 40+ inches

Table 11. OUT_B Port Output Pre-Emphasis Settings

Typical

Backplane

Length

PE_B[1]

PE_B[0]

Overshoot

0 dB

0 to 10 inches

1.9 dB

15%

10 to 20 inches

3.5 dB

35%

20 to 30 inches

4.9 dB

60%

30 to 40+ inches

LOOPBACK

The AD8159 also supports port level loopback, illustrated in

Figure 36. The loopback control pins override the lane select

(SEL[3:0]) and bicast control (BICAST) pins. Table 12 summa-

rizes the different loopback configurations.

1:2 DEMUX

OUT_A[3:0]

OUT_B[3:0]

IN_B[3:0]

IN_A[3:0]

PORT C LOOPBACK

PORT A LOOPBACK

PORT B LOOPBACK

2:1 MUX

IN_C[3:0]

OUT_C[3:0]

Figure 36. Port-Based Loopback Capability

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