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PDF AT78C1507 Data sheet ( Hoja de datos )
| Número de pieza | AT78C1507 | |
| Descripción | DVD/CD Read Channel | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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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 mVPPD or 110–1100 mVPPD
– 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
1
1 page  
2054A–DVD–07/02
DVD/CD Read Channel
Table 1. AT78C1503 Pin List (Continued)
Pin # Pin Name Type
Description
12 FOHG
Digital Input
Focus High Gain
13 REXT
Passive
Passive for 0 TC Current Reference (16.5 K_, 1%)
14 VDD1
3.3V Supply DPD, IBIAS
15 VSS1
0V Supply
DPD, IBIAS
16 FO1_CD
Analog Input Focus 1, CD Input
17 FO2_CD
Analog Input Focus 2, CD Input
18 TR1_CD
Analog Input Track 1, CD Input
19 TR2_CD
Analog Input Track 2, CD Input
20 VDD6
3.3V Supply Slow Servo Analog
21 SS_H
Digital Input
Servo Sample and Hold
22 VSS6
0V Supply
Slow Servo Analog
23 REFFRONT Input/Output Servo Front-end Reference Level
24 REFBACK Input/Output Servo back-end Reference Level
25 LENSPOS Analog Input Lens Position Error Input
26 ATP1
Analog Output Servo Analog Test Point
27 FE
Analog Output Focus Error Output
28 TE
Analog Output Tracking Error Output
29 SLOWSUM Analog Output Low-pass Filtered Sum of Photodetector Outputs
30 PORB
Digital Input
Power-on Reset, Bar (active-low)
31 VSS8
0V Supply
Servo DACs
32 VDD8
3.3V Supply Servo DACs
33 IDSEL
Digital Input
ID Field Select
34 LHIPWR
Digital Input
Laser High Power
35 SHLD
Digital Input
Servo Hold
36 ADCSTRT Digital Input Start On-chip 6-bit ADC
37 BWUP
Digital Input
Bandwidth Up
38 BWDN
Digital Input
Bandwidth Down
39 IDINT
Digital Input
Mode Select of Sequencer
40 PD
Digital Input
Power-down
41 RG
Digital Input
User Data Read Gate
42 VSS9
0V Supply
Servo DAC Rings
43 VDD9
3.3V Supply Servo DAC Rings
44 WOBBLE Digital Output Wobble Detect Output
45 ID12
Digital Output ID Field 12 Detected
46 ID34
Digital Output ID Field 34 Detected
47 TZC
Digital Output Track Zero Crossing
5
5 Page 
2054A–DVD–07/02
DVD/CD Read Channel
Table 3. AT78C1507 Pin List (Continued)
Pin # Pin Name
Type
Description
12 WBLCOAST Digital Input
Coast Wobble Clock Synthesizer
13 REXT
Passive
16 K_, 1% Resistor to 0V Supply
(for on-chip biasing)
14 VDD1
3.3V Supply
Power Supply
15 VSS1
0V Supply
Power Supply
16 TLOW2
0V
Tie-down to a 0V Supply
17 TLOW3
0V
Tie-down to a 0V Supply
18 CDOPC
Analog Input
CD Monitor Diode
19 DVDOPC Analog Input DVD Monitor Diode
20 VDD6
3.3V Supply
Power Supply
21 SHSB
Digital Input
Sample/Hold Control for E, F, G, H
(1 = Sample, 0 = Hold)
22 VSS6
0V Supply
Power Supply
23 REFFRONT Input/Output
Front-end Reference Voltage
24
REFBACK
Input/Output
Back-end Reference Voltage
25 TEMB
Analog Input
Tracking Error Main Beam from AT78C1503
(generated using A, B, C, D)
26 ATP1
Analog Output Analog Test Point (single-ended)
27 OPCOUT Analog Output Sampled Monitor Diode Output
28 TE
Analog Output Tracking Error Output
29 SUMSB
Analog Output E + F + G + H
30 PORB
Digital Input
Power-on Reset, Bar (active-low)
31 VSS8
0V Supply
Power Supply
32 VDD8
3.3V Supply
Power Supply
33 TLOW4
0V
Tie-down to a 0V Supply
34 LHIPWR
Digital Input
Laser High Power
35 THI1
3.3V
Tie-up to a 3.3V Supply
36
ADCSTRT
Digital Input
Start on-chip 6-bit ADC
37 SHCD
Digital Input
Sample/Hold Control for CD Monitor Diode
(1 = Sample, 0 = Hold)
38 SHDVD
Digital Input
Sample/Hold Control for DVD Monitor Diode
(1 = Sample, 0 = Hold)
39 TLOW7
0V
Tie-down to a 0V Supply
40 TLOW8
0V
Tie-down to a 0V Supply
41 THI2
3.3V
Tie-up to a 3.3V Supply
42 VSS9
0V Supply
Power Supply
43 VDD9
3.3V Supply
Power Supply
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AT78C1507.PDF ] | |
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