CH7318C datasheet, PDF - EEWORLD Datasheet

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CH7318C: DescriptionCH7318C AC Coupled Lever Shifter; CategoryOther integrated circuit (IC); File Size159KB，15 Pages; ManufacturerCHRONTEL; Websitehttp://www.chrontel.com.cn/; Quintiles Integrated Circuit (Shanghai) Co., Ltd. is a wholly-owned subsidiary of Chrontel, Inc. in Shanghai. Founded in 1986, Chrontel is a company engaged in the research and development and production of mixed-signal integrated circuits. Headquartered in San Jose, Silicon Valley, USA, Chrontel has many subsidiaries and offices around the world. Our products include TV decoders, TV encoders, DVI/LVDS/HDMI encoders, digital TV demodulators, image and audio processing, display controllers and other digital-analog hybrid chips. Our products are used by many well-known OEM manufacturers such as DELL, HP, SONY, TOSHIBA, FUJITSU, etc., and we have cooperated with well-known manufacturers such as Intel for many years.

Quintiles Integrated Circuit (Shanghai) Co., Ltd. was established in 2003 and is located in Zhangjiang Hi-Tech Development Zone, Pudong. Our business includes the research, development, design, testing, production of integrated circuits and the research, design, development, production of related software; the design, debugging and maintenance of system integration; and the provision of related technical consulting and technical maintenance. We have a team of highly qualified and educated employees and enjoy comprehensive technical support from the head office. We hope that more people of insight will join us to jointly build a successful integrated circuit company.

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CH7318C Overview

CH7318C AC Coupled Lever Shifter

Features

CH7318C is a high speed HDMI level shifter that converts low-swing AC coupled differential input to HDMI 1.4a compliant open-drain current steering Rx terminated differential output.

The CH7318C features integrated parallel termination resistors (50-ohm), which eliminate the requirement for external termination resistors on the TMDS differential output pins. This device has incorporated a ESD protection for DDC channels as well as TMDS signal lines. In addition, the DDC_EN pin controls bias voltage to enable or disable the DDC passgate level shifter gates. The OE* pin is a two- state output enable control for the differential input and the TMDS signal output. It can activate IN_Dx pins and OUT_Dx pins or switch them into high impedance. A unique pre-emphasis control is also implemented into CH7318C; this feature has four-level adjustment to increase rise and fall times which are degraded during the transmission over a long trace on PCB.

The device operates from a single +3.3V supply, and is characterized the operation temperature range from 0 °C to 70 °C (ambient temperature). The CH7318C is available in a 48-Pin QFN package.

Name：CH7318C

Description：AC Coupled Lever Shifter

Input Interface：HDMI, DVI

Output Interface：HDMI, DVI

Other features：

Audio Interface：

Parameters

Converts low-swing AC coupled differential input to HDMI 1.4a compliant open-drain current steering Rx terminated differential output.

HDMI TMDS level shifting operation up to 1.65Gb/s per lane (165MHz pixel clock).

Enable feature to turn off TMDS inputs and outputs and to enter low-power state.

Transparent operation: no re-timing or configuration required.

Inter-Pair added skew < 250ps

Intra-Pair added skew < 10ps

Switching power only from a single 3.3V supply.

Integrated 50-ohm termination resistors for AC coupled differential Inputs.

Pass-gate voltage limiters allow 3.3V termination on GMCH pins, 5V DDC termination on HDMI connector pins.

Human Body Model ESD protection: 8kV for all output pins and 2kV for all other pins.

Level shifter for HDMI 1.4a HPD.

Integrated pull-down resistor on HPD_SINK input guarantees “input low” when no display is plugged in.

Driver’s current adjustment +10%.

Inverting buffer for HPD signal

Configurable pre-emphasis level (0dB, 2.0dB, 4.0 dB, & 6.0dB)

Offered in a 48-Pin QFN Package.

CH7318C Preview

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Chrontel

CH7318C

CH7318C AC Coupled HDMI Level Shifter

1.0 F

EATURES

•

2.0 G

ENERAL

ESCRIPTION

CH7318C is a high speed HDMI level shifter that

converts low-swing AC coupled differential input to

HDMI 1.4a compliant open-drain current steering Rx

terminated differential output.

The CH7318C features integrated parallel termination

resistors (50-ohm), which eliminate the requirement for

external termination resistors on the TMDS differential

output pins.

This device has incorporated a ESD

protection for DDC channels as well as TMDS signal

lines. In addition, the DDC_EN pin controls bias

voltage to enable or disable the DDC passgate level

shifter gates. The OE* pin is a two- state output enable

control for the differential input and the TMDS signal

output. It can activate IN_Dx pins and OUT_Dx pins

or switch them into high impedance. A unique pre-

emphasis control is also implemented into CH7318C;

this feature has four- level adjustment to increase rise

and fall times which are degraded during the

transmission over a long trace on PCB.

The device operates from a single +3.3V supply, and is

characterized the operation temperature range from

°C

to 70

°C

(ambient temperature). The CH7318C is

available in a 48-Pin QFN package.

•

Converts low-swing AC coupled differential input to

HDMI 1.4a compliant open-drain current steering Rx

terminated differential output.

HDMI TMDS level shifting operation up to 1.65Gb/s

per lane (165MHz pixel clock).

Enable feature to turn off TMDS inputs and outputs and

to enter low-power state.

Transparent operation: no re-timing or configuration

required.

Inter-Pair added skew < 250ps

Intra-Pair added skew < 10ps

Switching power only from a single 3.3V supply.

Integrated 50-ohm termination resistors for AC coupled

differential Inputs.

Pass-gate voltage limiters allow 3.3V termination on

GMCH pins, 5V DDC termination on HDMI connector

pins.

Human Body Model ESD protection: 8kV for all output

pins and 2kV for all other pins.

Level shifter for HDMI 1.4a HPD.

Integrated pull-down resistor on HPD_SINK input

guarantees “input low” when no display is plugged in.

Driver’s current adjustment +10%.

Inverting buffer for HPD signal

Configurable pre-emphasis level (0dB, 2.0dB, 4.0 dB,

& 6.0dB)

Offered in a 48-Pin QFN Package.

201-1000-006

Rev. 2.4

01/24/2014

CHRONTEL

TABLE OF CONTENTS

1.0

2.0

3.0

3.1

3.2

CH7318C

Features ____________________________________________________________________ 1

General Description __________________________________________________________ 1

Pin-Out _____________________________________________________________________ 5

Package Diagram ....................................................................................................................................... 5

Pin Descriptions......................................................................................................................................... 6

4.0

4.1

4.2

4.3

4.4

4.5

Functional Description ________________________________________________________ 8

Power Supply............................................................................................................................................. 8

Clocking .................................................................................................................................................... 8

Reset .......................................................................................................................................................... 8

OE* Function............................................................................................................................................. 8

Pre-emphasis Function .............................................................................................................................. 9

5.0

5.1

5.2

5.3

5.4

5.5

5.6

5.7

Electrical Specifications ______________________________________________________ 10

Absolute Maximum Ratings .................................................................................................................... 10

Recommended Operating Conditions ...................................................................................................... 10

Differential Input ..................................................................................................................................... 10

TMDS OUTPUTS ................................................................................................................................... 11

HPD_SINK INPUT; HPD_SOURCE OUTPUT ..................................................................................... 12

OE* INPUT ............................................................................................................................................. 12

HPD Input Resistor.................................................................................................................................. 12

6.0

7.0

Package Dimensions _________________________________________________________ 13

Revision History ____________________________________________________________ 14

201-1000-006

Rev. 2.4

01/24/2014

CHRONTEL

FIGURE AND TABLES

LIST OF TABLES

CH7318C

Table 1: Pin Descriptions ............................................................................................................................................... 6

Table 2: OE* Description ............................................................................................................................................... 8

Table 3: OE* Function ................................................................................................................................................... 8

Table 4: Pre-emphasis Selection Table .......................................................................................................................... 9

Table 5: T

SC,

AMB,

STOR,

VPS

Ratings .................................................................................................................... 10

Table 6: Recommended Operating Conditions............................................................................................................. 10

Table 7: Differential Input Characteristics for IN_D Signals. ...................................................................................... 10

Table 8: TMDS Output Characteristics for OUT_D signals ........................................................................................ 11

Table 9: HPD Input and Output Characteristics ........................................................................................................... 12

Table 10: OE* Input Characteristics ............................................................................................................................ 12

Table 11: DDC Termination Resistors ......................................................................................................................... 12

Table 12: Revisions ...................................................................................................................................................... 14

LIST OF FIGURES

Figure 1: CH7318C Block Diagram ............................................................................................................................... 2

Figure 2: 48-Pin QFN Pin Out........................................................................................................................................ 5

Figure 3: 48 Pin QFN Package ..................................................................................................................................... 13

201-1000-006

Rev. 2.4

01/24/2014

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