AT78C1503 Datasheet, PDF (1/14 Pages) ATMEL Corporation – DVD/CD Read Channel

Features
• Operating Supply Range 3.0V to 3.6V
• Power Dissipation 1W Max
• Low-power Sleep Mode (<0.5 mW)
• RF Data Channel
– Automatic Gain Control or Programmable Gain Mode
– Wide Bandwidth VGA
– VGA Accepts Inputs from 30–300 mV Peak-to-peak Differential (PPD),
60–600 mV_PPD or 110–1100 mV_PPD
– Programmable Equalization via 7th-order Equiripple Filter with Programmable
Symmetric Zeros
– Programmable 5-to-1 Filter Cutoff Range
– Data Slicer with DC Restore Circuit
– Wide Frequency Range Clock Extraction
– Frequency Synthesizer with Independent 7-bit M and 6-bit N Dividers,
Better than 1% Resolution
– Highly Programmable to Accommodate DVD (1–5X) and CD (6–30X)
– Write Asymmetry Measurement for Adjusting Write-mode Power
– Data Recovery Supports CLV, ZCLV, ZCAV Recording
– Optional Internally-generated Timing for AGC and Timing Recovery
• Synthesizer Functions
– Supports Wobble Clock Synthesis, Using Low-jitter PLL
• Servo Algebra and OPC Functions
– 45 MHz Bandwidth for Differential Phase Tracking Detector
– Land and Groove Detector for DVD RAM
– Supports One Beam Push/Pull Tracking Output
– Supports One Beam Differential Phase Tracking
– Supports Three-beam Push/Pull Tracking Output, Using E, F, G, H
– Focus Error Signal Output
– Focus OK Signal
– Track Crossing Detection
– Mirror Signal Output
– Wobble Detection for DVD RAM, DVD-RW, DVD-R
– Detects Tracking Error OK
– Provides Sample and Hold Functions for CD and DVD OPC
– Formats Pre-pit Data, Using Raw Pre-pit Information from AT78C1503
• Header Detection for DVD RAM
DVD/CD Read
Channel
AT78C1503
AT78C1507
Description
The AT78C1503 is a programmable DVD/CD channel responsible for servo algebra, gain con-
trol, equalization, bit detection and clock extraction for CD-ROM, DVD-ROM, DVD-R, DVD-RW
and DVD-RAM formats. Programmable features allow data rates up to 5X DVD. Also, for DVD-
RAM functionality, the channel serves the write path providing laser power control and pit asym-
metry detection. Up to 2X DVD write speeds are supported for DVD-R, DVD-RW and DVD-
RAM. The extracted wobble frequency is supplied to the AT78C1507 companion chip which in
turn synthesizes the write clock.
The AT78C1507 is the companion chip to the AT78C1503 – DVD/CD Read Channel – and the
AT78C1504 – DVD/CD Automatic Laser Power Controller. Working in conjunction with the read
channel, the AT78C1507 is responsible for wobble clock synthesis for DVD-R and DVD-RAM
formats. In addition, the two parts working together also support pre-pit data and clock recovery
for the DVD-R format. Four separate inputs are provided to enable the AT78C1507 to perform
tracking servo algebra, using just the outrigger photo detector signals (E, F, G, H for example)
coming from the OPU. This extends the range of supported tracking servo algebra functions for
the 1503-1507 combination. Lastly, OPC capability is supported for efficient writing of DVD-R,
DVD-RAM and CD-R disks.
Based on CMOS technology, both the AT78C1503 and AT78C1507 operate from a single 3.3V
supply and are fully programmable through serial interfaces for both CD and DVD modes.
Rev. 2054A–DVD–07/02
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