TZA1032 データシートの表示（PDF） - Philips Electronics

部品番号

コンポーネント説明

メーカー

TZA1032

Laser driver and controller circuit

Philips Electronics 

Philips Semiconductors

Laser driver and controller circuit

Preliminary specification

TZA1032

1 FEATURES

• Separate 3.3 V digital, analog and output driver power

supplies

• Selective power-down of internal functions via I2C-bus

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 I2C-bus interface up to 400 kbits/s with block

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 I2C-bus; completely

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

• 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 Ω

• 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.

2 GENERAL DESCRIPTION

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.

2002 May 06

3

Share Link: