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PDF ATR1841 Data sheet ( Hoja de datos )
| Número de pieza | ATR1841 | |
| Descripción | Front Monitor Diode | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• 405 nm, 650 nm and 780 nm Wavelengths Supported
• Blu-ray/HD-DVD x5, CD-R/RW x52, DVD-R/RW x16
• Adjustment of Mode and Gain by Setting Internal Register via Two-wire Interface (TWI)
• 200 MHz Channel Bandwidth
• Paraphase Outputs
• Internal Reference Voltage Generation
• Fast Settling Time
• Low Offset Voltage
• Power-down Mode
• Pb-free Optical 12-pin Package
Applications
• Blu-ray/HD-DVD
• DVD+RW with CD-RW Capability
• DVD-RW with CD-RW Capability
• DVD-RAM with CD-RW Capability
• Recordable Optical Data Storage Devices
1. Description
The ATR1841 is a front monitor diode (FMD) which controls the laser power of the
optical pickup for Blu-ray/HD-DVD, DVD and CD drives in one IC.
With the Two-wire Interface (TWI) it is possible to fit the laser power for
Blu-ray/HD-DVD, DVD and CD. Two bits are used to set the mode/gain level and 6
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additional bits are used for gain trimming, within ±6 dB. Entering sleep mode is also
controlled via the TWI.
The integrated PIN diode and the high speed amplifier with low output impedance
ensures stable driver performance.
All output channels are set to tri-state during sleep mode.
Due to its small package size the ATR1841 is especially suited for applications with
low height requirements like SLIM and Ultra-SLIM drives.
Front Monitor
Diode for
Blu-ray/HD-DVD/
DVD/CD with
TWI
ATR1841
Summary
Preliminary
NOTE: This is a summary document.
The complete document is currently not
available. For more information, please
contact your local Atmel sales office.
9103AS–DVD–08/07
1 page  
ATR1841 [Preliminary]
6. Two-wire Interface (TWI)
6.1 Slave Address
MSB
(ADS)
LSB
0 0 1 1 1 0 0 R/W = 0
0 0 1 1 1 0 1 R/W = 0
Pin ADS = low (GND)
Pin ADS = high (VCC)
6.2 Data
MSB
m1 m2 g1 g2 g3 g4 g5
LSB
g6
6.3 Mode Setting
The first two bits select the mode/gain level.
Table 6-1.
m1
1
1
0
0
Mode Selection Register
m2 Mode Select
1 High gain
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0 Middle gain
1 Low gain
0 Sleep
6.4 Gain Setting
The last six bits are used to finely adjust the gain by ±6 dB
Table 6-2.
g1
1
1
0
Gain Selection Register
g2 g3
11
…
00
…
00
g4
1
0
0
g5
1
0
0
g6
1
0
0
Gain
+6 dB
…
0 dB
…
–6 dB
9103AS–DVD–08/07
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ATR1841.PDF ] | |
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