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CV8786

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CV8786

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The CV8786 device is a high quality, multi-format analog video and audio convert with HD transmitter . The CV8786 device supports YPbPr video signals up to 1080p60 resolution and RGB graphics signals from VGA to UXGA resolution.

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General Description

The device contains a 24 Bits audio ADC, So CV8786 can accept three format audio signal: Digital audio S/PDIF and I2S, analog stereo Line in.

Features

Analog Video Front-end

Three 10-bit ADCs sampling up to 170Mhz
Flexible input multiplexers to support YPbPr and VGA
Automatic format detection
Support 480i/p, 576i/p, 720p25/30/50/60,
Consumer Electronics Control(CEC ) version 1.3 1080i50/60, 1080p24/25/30/50/60
Support RGB graphics from VGA to UXGA
Support Macrovision

Analog audio Front-end

Advance Multi-bit ΔΣ Architecture
24-bit Conversion
Supports Audio Sample Rates Up to 108Khz
Low-Latency Digital Filter

Digital audio interface

Four I2S inputs with sample rate of 32~192Khz
S/PDIF interface supporting PCM,Dolby Digital, DTS digital audio at up to 192Khz frame rate
Compatible with IEC 60958 and IEC 61937

HD Transmitter

HD 1.3/DVI 1.0 compliant transmitter up to 170Mhz, supporting 1080p and UXGA.
Monitor detection

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Pin Diagram

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Function Block Diagram

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Function Description

Video Analog Front-end (AFE)

The Video Analog Front-end (AFE) provides three input channels for R, G, and B. Each channel includes an Input Multiplexer, a Clamp and Offset DAC, a Programmable Low-pass Filter, and a high quality 10-bit ADC with Programmable Gain Amplifier. In addition, there is a PLL to generate sampling clocks for ADCs, Sync Slicers to handle SOG signals.

Video Processing

Time Base Corrector

The Time Base Corrector (TBC) is designed to provide stable clock and video data for HD output.

Color Processing (CP)

Brightness, Contrast, Saturation controller

444 to 422 Decimation

Color Space Converters (CSC) :RGB to YCbCr and YCbCr to RGB

Auto Phase Detection (APD)

Auto Phase Detection is a module used to search for the phases that can generate the best display quality. The desired phases, in general, can generate sharp and stable images, if the input image meets certain criteria during phase detection period. APD is an automatic algorithm that can be enabled or disabled by software. It can be applied to both VGA and Component inputs.

Auto Position Calibration (APC)

Auto Position Calibration detects the active picture area of input video signal and adjusts the output timing so that the final picture can fit to the display properly.

Auto Gain Calibration (AGC)

Slight mismatch of analog input channels including offset and gain may impact the picture quality. The device has been well designed to keep the mismatches in acceptable range (<0.5 dB). It is still important to calibrate these mismatches in some cases to achieve the most accurate picture. To help manufactures to finish this process in low cost and short time, an Auto Gain Calibration mechanism is designed in the device. This mechanism will automatically measure the digitized signal levels through AGC module, calculate the correct values.

Audio Processing

The CV8786 can accept analog video signal Line-in and digital audio signal S/PDIF, I2S inputs.

Audio Analog Front-end (AFE)

Stereo, 24-Bit Advanced Multi-Bit ΔΣ Architecture analog to digital converter.

Low-Latency Digital Filter.

High-Pass Filter to Remove DC Offsets

S/PDIF

The S/PDIF stream can carry 2-channel uncompressed PCM data (IEC 60958) or a compressed bit stream for multi-channel (IEC 61937) formats. The audio data capture logic forms the audio data into packets in accordance with the HD specification. The S/PDIF input supports audio sampling rates from 32 to 192 kHz.

I2S

The I2S input allow transmission of DVD-Audio or decoded Dolby Digital to A/V Receivers and high-end displays. The interface supports up to 192 kHz.

Pin Description

PIN	Signal Name	Type	Dir	Description
1	AVSS	Ground	P/G	Audio ADC Ground
2	ARIN	Analog	Input	Line Input for Left Channel.
3	ALIN	Analog	Input	Line Input for Right Channel.
4	AV33_AU	Power		Audio ADC 3.3V power supply.
5	SPDIF	Schmitt	Input	S/PDIF Audio Input.
6	AU_MCLK	Schmitt	Input/ Output	Audio Master Clock.
7	I2S_D	Schmitt	Input/ Output	I2S Serial Data.
8	I2S_WS	Schmitt	Input/ Output	I2S Word Select.
9	I2S_SCK	Schmitt	Input/ Output	I2S Serial Clock.
10	DV18	Power	P/G	Digital power 1.8V
11	HPD	Schmit 5-V tolerant	Input	Hot Plug Detect Input.
12	DSDA	Schmitt Open-drain 5-V tolerant	Input/ Output	DDC I2C Bus Data.
13	DSCL	Schmit 5-V tolerant	Input/ Output	DDC I2C Bus Clock.
14	DV33	Power	P/G	Digital IO power 3.3V
15	AV33	Power	P/G	Analog Power 3.3V
16	AVSS	Ground	P/G	Analog Ground
17	REXT	Analog	Input	Voltage Swing Adjust. A resistor is connected from this signal to GROUND.This resistor determines the amplitude of the voltage swing.
18	AVSS	Power	P/G	Analog Ground
19	TXCN	TMDS	Output	TMDS output clock pair.
20	TXCP	TMDS	Output	TMDS output clock pair.
21	AV18H			HD TX 1.8V Power
22	TX0N	TMDS	Output	TMDS output data0 pairs.
23	TX0P	TMDS	Output	TMDS output data0 pairs.
24	AVSS	Ground	P/G	Analog Ground
25	TX1N	TMDS	Output	TMDS output data1 pairs.
26	TXIP	TMDS	Output	TMDS output data1 pairs.
27	AV18H	Power	P/G	HD TX 1.8V Power
28	TX2N	TMDS	Output	TMDS output data1 pairs.
29	TX2P	TMDS	Output	TMDS output data1 pairs.
30	AVSS	Ground	P/G	Analog Ground
31	DV33	Power	P/G	Ground
32	XTI			Crystal Input.
33	XTO			Crystal Output.
34	DVSS	Ground	P/G	Ground
35	DVSS	Ground	P/G	Ground
36	RSTB	Schmitt	Input	Reset signal(active LOW)
37	SCL	Schmitt	Input	Serial Port Data Clock
38	SDA	Schmit Open drain	Input/ Output	Serial Port Data I/O
39	VD18	Power	P/G	Digital Power 1.8V
40	VSS	Ground	P/G	Ground
41	INT	TTL	Output	Interrupt Output
42	DVSS	Ground	P/G	Ground
43	HS	Schmit 5-V tolerant	Input	Horizontal Sync Input
44	VS	Schmitt 5-V tolerant	Input	Vertical Sync Input
45	DV33	Power	P/G	Digital IO power 3.3V
46	AV33	Power	P/G	Analog 3.3V
47	AVSS	Ground	P/G	Analog Ground
48	BIN	Analog	Input	Analog Input for Blue Channel
49	AV33	Power	P/G	Analog 3.3V
50	AVSS	Ground	P/G	Analog Ground
51	AV18	Power	P/G	Analog 1.8V
52	GIN	Analog	Input	Analog Input for Green Channel
53	SOG	Analog	Input	Sync-on-Green Input
54	AV33	Power	P/G	Analog 3.3V
55	AVSS	Ground	P/G	Analog Ground
56	AV18	Power	P/G	Analog 1.8V
57	RIN	Analog	Input	Analog Input for Red Channel
58	AV33	Power	P/G	Analog 3.3V
59	AVSS	Power	P/G	Analog Ground
60	AV18	Power	P/G	Analog 1.8V
61	EP1	Ground	P/G	ERAD,Connect to Ground