SNLU288 December   2020

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Features
    2. 1.2 Applications
  3. 2Description
    1. 2.1  DS160PR412 and DS160PR421 4-Level I/O Control Inputs
    2. 2.2  DS160PR412 and DS160PR421 Modes of Operation
    3. 2.3  DS160PR412 and DS160PR421 SMBus or I2C Register Control Interface
    4. 2.4  DS160PR412 and DS160PR421 Equalization Control
    5. 2.5  DS160PR412 and DS160PR421 RX Detect State Machine
    6. 2.6  DS160PR412 and DS160PR421 DC Gain Control
    7. 2.7  DS160PR412-421EVM Global Controls
    8. 2.8  DS160PR412-421EVM Downstream Devices Control
    9. 2.9  DS160PR412-421EVM Upstream Devices Control
    10. 2.10 Quick-Start Guide (Pin Mode)
    11. 2.11 Quick-Start Guide (SMBus Slave Mode)
  4. 3Schematics
  5. 4PCB Layouts
  6. 5Bill of Materials

2.4 DS160PR412 and DS160PR421 Equalization Control

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).

Table 2-4 Equalization Control Settings
EQ INDEXEQ1 PIN LEVELEQ0 PIN LEVELCTLE BOOST AT 4 GHz (dB)CTLE BOOST AT 8 GHz (dB)
0L0L0–0.25–0.5
1L0L12.04.0
2L0L22.55.0
3L0L33.06.0
4L1L04.07.0
5L1L14.57.5
6L1L25.08.0
7L1L36.09.5
8L2L07.010
9L2L18.011
10L2L28.512.5
11L2L39.013
12L3L09.514.5
13L3L110.015
14L3L210.516.0
15L3L31218

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.