ATR1841 ATMEL | Alldatasheet
Document overview
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Technical content
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 additional bits are used fo r 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 9103AS–DVD–08/07
9103AS–DVD–08/07 ATR1841 [Preliminary] Figure 1-1. Block Diagram Gain Select (H/M/L) Gain Adjust (±6 dB) SDA SCL Internal Vref RF+ RF- GND VCC ADS
9103AS–DVD–08/07 ATR1841 [Preliminary] 2. Pin Configuration Figure 2-1. Pinning QFN12L GND RF- RF+ VCC GND ADS SCL SDA NC NC 91 2 NC NC 10 11 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
6 SCL Digital TWI serial clock
7A D S A n a l o g TWI slave address select
8 GND Supply Ground
9 NC Not connected
10 NC Not connected
11 NC Not connected
12 NC Not connected
9103AS–DVD–08/07 ATR1841 [Preliminary] 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 V CC –0.5 to +6.0 V Input voltage at any input V in –0.5 to VCC – 0.5 V Storage temperature T stg –40 to +100 °C Soldering temperature QFN_Open package T sol 260 °C 4. Recommended Operating Conditions Parameters Symbol Value Unit Supply voltage V CC 4.5 to 5.5 V Operating temperature range T amb –10 to +80 °C 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. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
1 DC Specifications, Power Supply
1.1 Supply current I CC 28 30 mA A
1.2 Supply current
(standby mode) ICC 0.5 mA A 1.3 V REF_INT 1.65 V A
1.4 TCV REF_INT 15 µV/°C C
1.5 Maximum output voltage V out
VCC – 0.9 VC 1.6 Minimum output voltage V out 0.3 V C
1.7 Power supply rejection
Low-frequency (10 kHz), inclusive application/ flexboard PSRR –45 dB C
1.8 Power supply rejection
(100 kHz), inclusive application/ flexboard PSRR –45 dB C
2 Output Offset Voltage
2.1 Output offset V
REF – VRF+, VREF – VRF– VOFF1 –20 0 +20 mV C
2.2 Offset drift dV OFF/dT –25 +25 µV/°C C
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
9103AS–DVD–08/07 ATR1841 [Preliminary] 6. Two-wire Interface (TWI)
6.1 Slave Address
6.2 Data
6.3 Mode Setting
The first two bits select the mode/gain level.
6.4 Gain Setting
The last six bits are used to finely adjust the gain by ±6 dB MSB (ADS) LSB 0 01110 0 R/W = 0 Pin ADS = low (GND) 0 01110 1 R/W = 0 Pin ADS = high (V CC) MSB LSB m1 m2 g1 g2 g3 g4 g5 g6 Table 6-1. Mode Selection Register m1 m2 Mode Select 1 1 High gain 1 0 Middle gain 0 1 Low gain
00 S l e e p
Table 6-2. Gain Selection Register g1 g2 g3 g4 g5 g6 Gain 111111 + 6 d B 100000 0 d B 000000 – 6 d B
9103AS–DVD–08/07 ATR1841 [Preliminary] 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 Photo diode is symmetrically centered to the center of the chip and package Dimensions D 500.0 µm
9103AS–DVD–08/07 ATR1841 [Preliminary] 10. Package Information 9. Ordering Information Extended Type Number Package Remarks ATR1841-P1QN QFN_OPEN_3x3_8L Taped and reeled, Pb-free
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