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Si5040
5. Receiver
The Si5040 receiver includes a programmable equalizer, a high-sensitivity limiting amplifier, clock and data
recovery unit (CDR), and a FIFO/retimer function.
5.1. Receive Equalizer
The RX equalizer is a programmable equalizer designed to boost the high-frequency components while
attenuating the low-frequency components. Figure 9 illustrates a typical frequency response of the RX equalizer
when its capacitor setting (or high-frequency boost, RxEqHFBoost at Register 85, Bit [7:5]) is set to the maximum
value and its resistor setting (or low-frequency gain/attenuation, RxEqGain at Register 84, Bit [7:5]) is changed to
achieve different low-frequency attenuations.
2.00
1.00
0.00
-1.00
-2.00
-3.00
-4.00
-5.00
-6.00
-7.00
-8.00
-9.00
-10.00
-11.00
-12.00
-13.00
-14.00
-15.00
-16.00
-17.00
-18.00
-19.00
-20.00
-21.00
-22.00
-23.00
-24.00
-25.00
1.00E+06
1.00E+07
1.00E+08
1.00E+09
1.00E+10
1.00E+11
Frequency (Hz)
Figure 9. Typical RX Equalizer
Frequency Response
To optimize the equalizer settings for a given application, the following procedure is recommended:
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Set RxEqHFBoost at Register 85, Bit [7:5] to 7 (Default = 4), and adjust RxEqGain at Register 84, Bit [7:5]
(Default = 5), to achieve the best performance.
Further adjust RxEqHFBoost to increase the performance further.
Note that setting RxEqGain to 0 dB bypasses the equalizer.
Rev. 1.3
19
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