Rainbow Electronics ATR1842 User Manual
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 Serial Interface
• 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
Front Monitor
Diode for
Blu-ray/HD-DVD/
DVD/CD with
Serial Interface
1. Description
The ATR1842 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 serial programming interface (SPI) it is possible to fit the laser power for
Blu-ray/HD-DVD, DVD and CD. 2 bits are used to set the mode/gain level and 6 additional bits are used for gain trimming, within ±6 dB. Also setting into sleep mode can
be done via the serial programmin interface (SPI).
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 ATR1842 is especially suited for applications with
low height requirements like SLIM and Ultra-SLIM drives.
ATR1842
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.
9109AS–DVD–08/07
Figure 1-1. Block Diagram
SENB
SDATA
SCLK
VCC
Gain Select (H/M/L)
Gain Adjust (±6 dB)
GND
RF+
RF-
Internal
Vref
ADS
2
ATR1842 [Preliminary]
9109AS–DVD–08/07
2. Pin Configuration
Figure 2-1. Pinning QFN12L
ATR1842 [Preliminary]
NC NC
10 11
GND
RF+
VCC
RF-
1
2
3
4
912
NC NC
Table 2-1. Pin Description
Pin Symbol Type Function
1 GND Supply Ground
2 RF- Analog Negative output
3 RF+ Analog Positive output
4 VCC Supply Power supply
5 SDATA Digital Serial interface, data input
6 SCLK Digital Serial interface, clock
7 SENB Digital Serial interface, data enable
8 GND Supply Ground
9 NC Not connected
10 NC Not connected
11 NC Not connected
12 NC Not connected
8
7
6
5
GND
SENB
SCLK
SDATA
9109AS–DVD–08/07
3
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