SNLU288 December 2020
Each channel of the DS160PR412 and DS160PR421 features a continuous-time linear equalizer (CTLE) that applies high-frequency boost and low-frequency attenuation to help equalize the frequency-dependent insertion loss effects of the passive channel. Table 2-4 shows available equalization boost through EQ control pins (EQ1 and EQ0) for all channels when in Pin Control mode (MODE = L0).
| EQ INDEX | EQ1 PIN LEVEL | EQ0 PIN LEVEL | CTLE BOOST AT 4 GHz (dB) | CTLE BOOST AT 8 GHz (dB) |
|---|---|---|---|---|
| 0 | L0 | L0 | –0.25 | –0.5 |
| 1 | L0 | L1 | 2.0 | 4.0 |
| 2 | L0 | L2 | 2.5 | 5.0 |
| 3 | L0 | L3 | 3.0 | 6.0 |
| 4 | L1 | L0 | 4.0 | 7.0 |
| 5 | L1 | L1 | 4.5 | 7.5 |
| 6 | L1 | L2 | 5.0 | 8.0 |
| 7 | L1 | L3 | 6.0 | 9.5 |
| 8 | L2 | L0 | 7.0 | 10 |
| 9 | L2 | L1 | 8.0 | 11 |
| 10 | L2 | L2 | 8.5 | 12.5 |
| 11 | L2 | L3 | 9.0 | 13 |
| 12 | L3 | L0 | 9.5 | 14.5 |
| 13 | L3 | L1 | 10.0 | 15 |
| 14 | L3 | L2 | 10.5 | 16.0 |
| 15 | L3 | L3 | 12 | 18 |
The equalization gain of each channel of each device can also be set by writing to SMBus / I2C registers in I2C Mode. See the DS160PR412, DS160PR421 Programming Guide for details.