ML6461CS datasheet(6/30 Pages) MICRO-LINEAR

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ML6461

FUNCTIONAL DESCRIPTION

INTRODUCTION

The ML6461 is a single-chip NTSC video encoder for

generating analog composite (CV) and S-video (Y/C)

outputs from YCrCb digital inputs. The ML6461 is a mixed

signal processor optimizing SNR and distortion by

performing subcarrier generation, sync generation,

modulation and upsampling in the digital domain, while

performing mixing, reconstruction and gain scaling in the

analog domain. In particular, the Y channel requires no

digital scaling, eliminating the need for higher precision

digital solutions. All timing is based on an external clock

source either 27MHz for CCIR656 clock rate or

24.54MHz for square pixel clock rate.

Additionally, the ML6461 allows the inclusion of Closed

Captioning codes in the vertical blanking interval (VBI).

Both lines 21 and 284 support Closed Captioning.

Table 1. Video Encoder Functional Selection

Table 2: Video Standards and Clock Rates

DEVICE

FUNCTIONAL DESCRIPTION

Video Formats

Clock

DAC

Closed

Macrovision

Reconstruction

Ω

Rates

Caption

Filter

Cable

Encoder

Driver

NTSC

PAL

CCIR656

Square

Pixel

ML6460

Yes. Input: 8-Bit

Yes

Yes.

Yes

Yes. 7th-order

Yes.

YCrCb digital

10-bit

Butterworth, with

Outputs: Y, C,

DAC

group delay

and CV analog

equalization

ML6461

Yes. Input: 8-Bit

Yes

Yes.

Yes

Yes. 7th-order

Yes.

YCrCb digital

10-bit

Butterworth, with

Outputs: Y, C,

DAC

group delay

and CV analog

equalization

HORIZONTAL

PIXELS PER

INPUT

CLOCK RATE

LINES PER FRAME

HORIZONTAL LINE

NTSC CCIR656

27 MHz

525

858

NTSC Square Pixel

24.54 MHz

525

780

Other special functions include: programmable polarity

and relative position of sync pulses, master and slave

modes of which includes the ability to handle ITU-R656-

compliant digital TV or ITU-R/SMPTE specifications,

chroma subcarrier phase and frequency adjustments from

external source; Japanese NTSC support; 100% color bars

processing; and internal 7th order reconstruction filters

with group delay equalization and 6dB line drivers for

direct TV output.

The ML6461 can be programmed and controlled via a

two-wire serial bus or preset modes. A summary of the

features of the ML6461 are listed in Table 1.

VIDEO STANDARDS SUPPORTED

The ML6461 supports NTSC only. The video standards

and clock rates are listed in Table 2.

Table 3: Pin Assignments for Various Master/Slave Modes

MODE

VSYNC PIN

HSYNC PIN

FIELD PIN

Master Mode

OUT

IN/OUT

External Slave Mode

IN/OUT

Internal Slave Mode (SAV/EAV CCIR656)

OUT

IN/OUT

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