tza1032 NXP Semiconductors, tza1032 Datasheet - Page 3

• Manufacturer Part Number: tza1032
• Description: Laser Driver And Controller Circuit
• Manufacturer: NXP Semiconductors

Philips Semiconductors
1
2002 May 06
Separate 3.3 V digital, analog and output driver power
supplies
Selective power-down of internal functions via I
for power saving
Low voltage-swing of the differential Run Length Limited
Code (RLC) inputs for high speed transmission and
good electromagnetic compatibility
High-impedance input switching to control two or more
TZA1032 ICs in parallel for double writer applications
Supports I
transfer feature in slave mode only
3.3 and 5 V tolerant input logic
Supports any RLC code with run lengths from 1 to 15
Automatic write-read switching for run lengths 16
Channel decoding rate up to 105 Mbits/s, according to
DVD 4
Look back function to enable write pre-compensation by
data dependent write strategy with a land-pit
compensation up to five
Supports Forced Erase (FE) mode for quick initialisation
of disc
Fixed propagation delay within RLC clock periods to
allow accurate data linking on disc
Supports CD-R, CD-RW, DVD+RW, DVD-R, DVD-RW
and DVR formats or any comparable existing or future
format
Programmable write strategy via I
flexible up to a maximum of two output level transitions
per RLC clock period
Pulse timing resolution of 2 ns at 500 MHz internal clock
Minimum pulse width of 4 ns at 500 MHz internal clock
Four programmable threshold current levels with an
8-bit resolution, and eight programmable delta levels
with an 8-bit resolution
Independent laser threshold and laser delta current
control
Programmable modulation unit
Pointer memory mapping to allow compact write
strategy coding
PLL oscillator features a self-learning oscillator mode for
non-locked operation during read
Wide frequency range: PLL locking factor 2.5
Laser driver and controller circuit
FEATURES
2
C-bus interface up to 400 kbits/s with block
2
C-bus; completely
2
C-bus
3
2
The TZA1032 is a laser driver circuit which is intended for
a wide range of recordable and re-writable optical drives.
Figure 3 shows a function diagram of TZA1032 in relation
to a disc recording system. The TZA1032 is intended to be
located close to the laser diode on the Optical Pick-up
Unit (OPU). It can be used in CD-R/RW systems
with 1 , 2 , 4 , 8 , 12 , 16 and 24 (24 is not
guaranteed yet: evaluation pending) speed and in
DVD-R/RW systems with 1 , 2 and 4 speed (4 is not
guaranteed yet). Furthermore, it is suitable for future
standards like DVR.
Two output channels, delta and threshold current levels,
each capable of delivering 240 mA delta and 200 mA
threshold peak current to the output
Rise and fall times of 1 to 2 ns, depending on package
and laser
Typical output resistance of 120
Programmable current step size for a threshold level of
0 to 1 mA at a 16-bit resolution, and a delta level of
0 to 1.2 mA at an 8-bit resolution
Internal modulator up to 565 MHz
Forward Sense (FS) Laser Power Control (LPC) loop to
compensate laser drift due to temperature and aging
Internal set point generation to allow read-write
switching without any transient effects
Digital LPC algorithm based on FS feedback
Single forward sense diode connection
Programmable FS input current gain to allow for spread
in FS efficiency
Supports running Optimum Power Control (OPC) loop,
so called alpha loop, to monitor and control the quality of
writing
Programmable loop bandwidths: up to 1 kHz for the
LPC, and up to 50 kHz for the alpha loop
Programmable minimum and maximum limiting of laser
currents and running OPC range
Programmable OPC stepper.
GENERAL DESCRIPTION
Preliminary specification
TZA1032