GS6151 datasheet(16/77 Pages) SEMTECH

16 / 77 page

GS6151

Final Data Sheet

Rev.4

PDS-060389

August 2015

16 of 77

Semtech

Proprietary & Confidential

www.semtech.com

4. Detailed Description

The GS6151 is a multi-standard CDR for signals operating at the following data rates:

125Mb/s, 270Mb/s, 1.485Gb/s, 1.485/1.001Gb/s, 2.97Gb/s, 2.97/1.001Gb/s, 5.94Gb/s,

and 5.94/1.001Gb/s.

4.1 Serial Data Inputs

The GS6151 features two 100Ω terminated differential input buffers.

A serial data input signal may be connected to either of the two input pin pairs of the

device: DDI0/DDI0 and DDI1/DDI1

By default, the self-biasing circuit at the input is enabled to allow AC coupling to

upstream devices. To enable DC coupling of the inputs, the user must disable the

self-biasing network by setting bits 4:4 through 5:5 to 0 in the register 7h:

DDI[0:1]_TRACE_EQ_DC_TERM_ENABLE.

In order to select DC coupling, please ensure that the output common mode of the

upstream device is in range of the input common mode voltage range shown in

Table 2-2.

The serial digital input buffer is capable of operating with any binary coded signal that

meets the input signal level requirements defined below, with any data rate between

3Mb/s and 5.94Gb/s.

4.1.1 Input Trace Equalization

The GS6151 features adjustable trace equalization to compensate for PCB trace

dielectric losses up to half the maximum supported data rate, or 3GHz.

These settings are selected using the DDI0_TRACE_EQ_CONTROL and

DDI1_TRACE_EQ_CONTROL bits in the INPUT_CONTROL_REG_0 register at address 5h.

The default state of the device is input trace equalization on all inputs set to LOW.

If system jitter profile allows, it is recommended that the loop bandwidth is reduced to

the minimum setting to maximize performance.

Table 4-1: Equalization Settings

Data Rate

Trace Loss

Settings

2.97Gb/s and below

0-7dB of trace loss at 1.5GHz

LOW (default)

5.94Gb/s

0-10dB of trace loss at 3GHz

2.97Gb/s and below

7-12dB of trace loss at 1.5GHz

HIGH

—

negligible trace loss

0dB or EQ_BYPASS

GS6151 Datasheet(PDF) 16 Page - Semtech Corporation

GS6151 Datasheet(HTML) 16 Page - Semtech Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77

Datasheet Descarga

Enlace URL