Datasheet

Quick Start Guide

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5. Set the input equalization level.

• For external pin mode control of the equalization level:

• Set ENSMB = 0 (1kΩ to GND) by using the SW2 (3-2-1) = (ON-OFF-OFF).

• SW4 pin1,2 must be set to the OFF positions, so the SMBUS signals are disconnected.

• Refer to Table 1 for information on the 3 switch settings for the 4 level input.

Example:

• Set EQB[1:0] with SW1 for the B bank of inputs (top 4 inputs of DS125BR401).

• SW1 (6-5-4), (3-2-1) = (OFF-ON-OFF), (OFF-ON-OFF) = EQB[1:0] = R,R (Level 6).

• Set EQA[1:0] with SW8 for the A bank of inputs (bottom 4 inputs of DS125BR401).

• SW8 (6-5-4), (3-2-1) = (OFF-ON-OFF), (OFF-ON-OFF) = EQA[1:0] = R,R (Level 6).

Table 4. EQ Settings available with PIN MODE

Level EQA/B[1:0] SW1 - EQB[1:0] or SW8 - EQA[1:0] EQ (dB) @ 6 GHz

6 5 4 3 2 1

1 0, 0 ON OFF OFF ON OFF OFF 3.1

2 0, R ON OFF OFF OFF ON OFF 6.7

3 0, F ON OFF OFF OFF OFF OFF 8.4

4 0, 1 ON OFF OFF OFF OFF ON 9.1

5 R, 0 OFF ON OFF ON OFF OFF 13.7

6 R, R OFF ON OFF OFF ON OFF 16.2

7 R, F OFF ON OFF OFF OFF OFF 15.9

8 R, 1 OFF ON OFF OFF OFF ON 17.0

9 F, 0 OFF OFF OFF ON OFF OFF 20.7

10 F, R OFF OFF OFF OFF ON OFF 21.8

11 F, F OFF OFF OFF OFF OFF OFF 23.6

12 F, 1 OFF OFF OFF OFF OFF ON 24.7

13 1, 0 OFF OFF ON ON OFF OFF 28.0

14 1, R OFF OFF ON OFF ON OFF 29.2

15 1, F OFF OFF ON OFF OFF OFF 30.9

16 1, 1 OFF OFF ON OFF OFF ON 31.9

DS125BR401EVM Evaluation Kit SNLU121–November 2012

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