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AT78C1507 Datasheet

  • AT78C1507

  • DVD/CD Read Channel

  • 14頁

  • ATMEL   ATMEL

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Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Operating Supply Range 3.0V to 3.6V
Power Dissipation 1W Max
Low-power Sleep Mode (<0.5 mW)
RF Data Channel
鈥?Automatic Gain Control or Programmable Gain Mode
鈥?Wide Bandwidth VGA
鈥?VGA Accepts Inputs from 30鈥?00 mV Peak-to-peak Differential (PPD),
60鈥?00 mV
PPD
or 110鈥?100 mV
PPD
鈥?Programmable Equalization via 7th-order Equiripple Filter with Programmable
Symmetric Zeros
鈥?Programmable 5-to-1 Filter Cutoff Range
鈥?Data Slicer with DC Restore Circuit
鈥?Wide Frequency Range Clock Extraction
鈥?Frequency Synthesizer with Independent 7-bit M and 6-bit N Dividers,
Better than 1% Resolution
鈥?Highly Programmable to Accommodate DVD (1鈥?X) and CD (6鈥?0X)
鈥?Write Asymmetry Measurement for Adjusting Write-mode Power
鈥?Data Recovery Supports CLV, ZCLV, ZCAV Recording
鈥?Optional Internally-generated Timing for AGC and Timing Recovery
鈥?/div>
Synthesizer Functions
鈥?Supports Wobble Clock Synthesis, Using Low-jitter PLL
鈥?/div>
Servo Algebra and OPC Functions
鈥?45 MHz Bandwidth for Differential Phase Tracking Detector
鈥?Land and Groove Detector for DVD RAM
鈥?Supports One Beam Push/Pull Tracking Output
鈥?Supports One Beam Differential Phase Tracking
鈥?Supports Three-beam Push/Pull Tracking Output, Using E, F, G, H
鈥?Focus Error Signal Output
鈥?Focus OK Signal
鈥?Track Crossing Detection
鈥?Mirror Signal Output
鈥?Wobble Detection for DVD RAM, DVD-RW, DVD-R
鈥?Detects Tracking Error OK
鈥?Provides Sample and Hold Functions for CD and DVD OPC
鈥?Formats Pre-pit Data, Using Raw Pre-pit Information from AT78C1503
鈥?/div>
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 鈥?DVD/CD Read Channel 鈥?and the
AT78C1504 鈥?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鈥揇VD鈥?7/02
1

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