ATMEL ATR1842

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
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.
Front Monitor
Diode for
Blu-ray/HD-DVD/
DVD/CD with
Serial Interface
ATR1842
Summary
Preliminary
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.
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
Gain Select (H/M/L)
Gain Adjust (±6 dB)
RF+
RFInternal
Vref
VCC
GND
2
ADS
ATR1842 [Preliminary]
9109AS–DVD–08/07
ATR1842 [Preliminary]
2. Pin Configuration
Figure 2-1.
Table 2-1.
Pinning QFN12L
NC
NC
10
11
GND
1
8
GND
RF-
2
7
SENB
RF+
3
6
SCLK
VCC
4
5
SDATA
9
12
NC
NC
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
3
9109AS–DVD–08/07
3. Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameters
Symbol
Value
Unit
Supply voltage
VCC
–0.5 to +6.0
V
Input voltage at any input
Vin
–0.5 to VCC – 0.5
V
Storage temperature
Tstg
–40 to +100
°C
Soldering temperature QFN_Open package
Tsol
260
°C
Symbol
Value
Unit
Supply voltage
VCC
4.5 to 5.5
V
Operating temperature range
Tamb
–10 to +80
°C
4. Recommended Operating Conditions
Parameters
5. Electrical Characteristics: General
VCC = 5V, Tamb = 25°C, λ = 405 nm/780 nm/650 nm
Output load: Rload = 10 kΩ, Cload = 20 pF
No.
1
Parameters
Test Conditions
Pin
Symbol
Min.
Typ.
Max.
Unit
Type*
28
30
mA
A
0.5
mA
A
DC Specifications, Power Supply
1.1
Supply current
ICC
1.2
Supply current
(standby mode)
ICC
1.3
VREF_INT
1.4
TCVREF_INT
1.5
Maximum output voltage
Vout
1.6
Minimum output voltage
Vout
1.7
Power supply rejection
ratio
Low-frequency (10 kHz),
inclusive application/
flexboard
PSRR
1.8
Power supply rejection
ratio
High-frequency
(100 kHz), inclusive
application/ flexboard
PSRR
2
Output Offset Voltage
VREF – VRF+, VREF – VRF–
VOFF1
–20
dVOFF/dT
–25
2.1
Output offset
2.2
Offset drift
1.65
V
A
15
µV/°C
C
V
C
V
C
–45
dB
C
–45
dB
C
+20
mV
C
+25
µV/°C
C
VCC –
0.9
0.3
0
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
4
ATR1842 [Preliminary]
9109AS–DVD–08/07
ATR1842 [Preliminary]
6. Serial Programming Interface
6.1
Data
MSB2
m1
6.2
LSB2
m2
g1
g2
g3
g4
g5
g6
Mode Setting
The first two bits select the mode/gain level.
Table 6-1.
6.3
Mode Selection Register
m1
m2
Mode Select
1
1
High Gain
1
0
Middle Gain
0
1
Low Gain
0
0
Sleep
Gain Setting
The last six bits are used to finely adjust the gain by ±6 dB.
Table 6-2.
Gain Selection Register
g1
g2
g3
g4
g5
g6
Gain
1
1
1
1
1
1
+6 dB
…
1
0
0
0
0
0
…
0
0
0
0 dB
0
0
0
–6 dB
…
…
5
9109AS–DVD–08/07
7. Applications Recommendation
To achieve the best performance VCC needs to be blocked using a high quality capacitor
(C = 100 nF) as close to IC/pin as possible.
8. Photo Diode Arrangement
Figure 8-1.
Phote Diode Arrangement
D
D
Dimensions
500.0
µm
Photo diode is symmetrically centered
to the center of the chip and package
6
ATR1842 [Preliminary]
9109AS–DVD–08/07
ATR1842 [Preliminary]
9. Ordering Information
Extended Type Number
Package
Remarks
ATR1842-P1QN
QFN_OPEN_3x3_8L
Taped and reeled, Pb-free
10. Package Information
7
9109AS–DVD–08/07
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9109AS–DVD–08/07