ZHCSM45 june 2023 DS320PR1601
PRODUCTION DATA
The DS320PR1601 receivers feature 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. The device has 18 available equalization boost settings that can be set though SMBus/I2C registers. Table 7-1 provides the device EQ settings.
Refer to the DS160PR1601 and DS320PR1601 Programming Guide for detail register sets and control configuration procedures.| EQUALIZATION SETTING | TYPICAL EQ BOOST (dB) | ||
|---|---|---|---|
| EQ INDEX | at 4 GHz | at 8 GHz | at 16 GHz |
| 0 | 1.5 | 2.9 | 2.9 |
| 1 | 2.1 | 4.3 | 4.9 |
| 2 | 2.8 | 5.7 | 6.9 |
| 5 | 3.7 | 6.4 | 9.2 |
| 6 | 4.1 | 7.2 | 10.1 |
| 7 | 4.4 | 7.8 | 10.9 |
| 8 | 4.9 | 8.5 | 11.5 |
| 9 | 5.3 | 9.1 | 12.2 |
| 10 | 5.9 | 10.1 | 13.5 |
| 11 | 6.2 | 10.5 | 14.0 |
| 12 | 6.9 | 11.5 | 15.0 |
| 13 | 7.5 | 12.4 | 15.8 |
| 14 | 7.7 | 12.7 | 16.5 |
| 15 | 8.1 | 13.5 | 17.5 |
| 16 | 8.4 | 14.1 | 18.3 |
| 17 | 8.9 | 14.9 | 19.2 |
| 18 | 9.3 | 15.6 | 20.0 |
| 19 | 9.8 | 16.3 | 21.0 |
Note in I2C mode default EQ setting does not map one of the EQ index, as provided in Table 7-1. EQ Boost values are same as EQ INDEX = 5 with slightly different EQ profile.
EQ profile selection option available through I2C shared register 0x03 provides subtle EQ gain curve modification option to match board trace or cable loss profile. The fine tuning alters mid frequency EQ boost values. EQ profile controls are thermometer coded and increase boost at 1 GHz by about 0.5 dB per setting increase. The equalization boost values for the range of 4-16 GHz are mostly unchanged with this subtle EQ gain profile change.