Read Channel AT78C2000 Summary 3521AS-NETST-5/05 Note:

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General Fully integrated 41.85 Read Channel Device Supports Constant Density Recording 41.85 Mbps with External Component Changes Fabricated 0.18-micron CMOS Technology Operating Supply Voltages: ±10% ±10% volts ±10% (with Internal 1.8V Voltage Regulator Enabled) Available 64-pin TQFP Package Read Data Conditioning Full-Differential Analog Front-End Automatic Sampled-time Gain Control Loop Algorithm 4-Banded Variable Gain Amplifier Accommodate Input Signal Ranges 30-300 mVppd Normalize Incoming Data within 100-300 Samples Optional Initial Gain Shadow Registers each Head/Field Combination Locks Random Acquisition Fields 7th-order Bessel Continuous Time Filter Programmable Filter Supports Cut-offs from Filter Boost Programmable from 10dB Flat Group Delay (without Boost) 6-bit Analog-to-Digital Converter Automatic Offset Correction Sampled-time Timing Recovery Loop Frequency Phase Acquire Acquires Incoming Data within Samples Acquisition Field Locks Random Data Acquisition Field Digital Full-LMS Adaptive Equalizer Correlation Detector Detects Highly Correlated Fields (2T, 12T) Stops Adaptation Viterbi Data Detection Programmable Drop-Out Detection User Programmable Fields System Optimization Programmable Head Recovery Delay Programmable IDLE Times After Drop-out, Excess Zeros Gaps Programmable Length LowZ After Readgate Pin) Assertion Programmable Acquisition Field Lengths Gain Timing Recovery Loops Head Field Sensitive Features When Applicable, Unique User Defined Parameters Provided Audio, Non-audio Fields Head0 Head1 Combinations Order Optimize each Head/Field Combination Detector LDV5000 Includes Digital Heterodyne Tuner Detect Servo Automatic Tracking Frequencies (ATF) Servo Tone Amplitude Difference Provided STDIF Output Trick Mode Support Programmable Registers Allows User Configure Device Work Properly Various Modes Operation, such NTSC Forward Reverse Dropouts Automatically Detected Dropout Detector Block
Read Channel AT78C2000
Summary
3521AS-NETST-5/05
Note: This summary document. complete document available under NDA. more information, please contact your local Atmel sales office.
Channel Optimization Vehicles
Quality Metrics Channel Optimization 8-bit Digital Test Testability Channel Optimization Test Modes Built-In Test Logic Minimize Test Vectors Allow Fault Testing Field Analog Test Inputs Outputs Provided Control Observation Internal Analog Blocks 8-bit Digital Test Provided Digital Some Analog Testability User Interface 3-bit Serial Interface Port Access Internal Configuration Registers load Verify Register Contents Monitor Status Collect Chip Feedback Power-down Modes Register Controlled Powerdown Analog Blocks During Non-read Mode, Clock Digital Logic Shut-off Conserve Power Internal Power-On-Reset (POR) Monitors Voltage Level Small Voltage Places Device Power-down Mode Until Voltage Assumes Working Level External Power-down
Overview
AT78C2000 Read Channel tailored 41.85 Digital Video Camera (DVC) platform. primary function this device read signal from media (presented preamp), extracting data data clock controller. secondary function detect Automatic Tracking Frequencies 697.5 KHz. system, AT78C2000 interfaces preamp, microprocessor controller. Channel performance information available through AT78C2000 Quality Engine, which used metric help optimize channel's bit-error rate. AT78C2000 utilizes 0.18 micron CMOS process technology power consumption small area. part requires power supplies: 3.3V ±10% 1.8V ±10% power supply 3.3V ±10% (with internal 1.8V voltage regulator enabled). part available 64-pin TQFP package.
AT78C2000
3521AS-NETST-5/05
3521AS-NETST-5/05
Figure 1-1. Block Diagram
Note: Grey shading indicates analog block
padSEN padSD padSCK padSEN padSD padSCK reg_sel reg_selects updi updi updo updo padRG gcnewus iorg gcnewus
padXZ padRG
cciacq
padRG ccgctrk cctrtrk ccgcrg cctrrg lowz
padDO
gcnewus gcerr gcdac
gcnewus gcerr gcdac
slrd adafrd
slrd cdcd
cdcd
GCDAC
pgrg pgrg
pgrd
pgrd
adrd adafrd
gcsl slrd
afrd test data
updo
padDIP
cdcd cdcd adrd
afrd afrd
padDIN
adrd
ddrd
slgcrd ddrd ddrd sltrrd
padrd
afrd rsck
trsl
trck
slrd adafrd
fref adrd afrd adrg afrg lowz trerr gcerr gcnewus adrd afrd adrg afrg lowz trerr gcerr gcnewus
adrd
updo padTB updo
padFREF
pherr trck phadj fref pherr
adafrd slrd phadj
padATIX padATIY
IO_TL
padATIX padATOAC padATIY padATODC
padATOACx/y
porb
porb
AT78C2000
padATODCx/y
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3521AS-NETST-5/05

Read Channel AT78C2000 Summary 3521AS-NETST-5/05 Note:

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