SAF784X datasheet(66/93 Pages) NXP

66 / 93 page

SAF784X_2

Product data sheet

Rev. 02 — 9 May 2008

66 of 93

NXP Semiconductors

SAF784x

One chip CD audio device with integrated MP3/WMA decoder

6.10 Laser interface

The laser diode pre-amp function is built in to the SAF784x and is illustrated in Figure 37.

The current, up to 120 mA, can be regulated in four steps ranging from 58 % up to full

power. The voltage derived from the monitor diode is maintained at a steady state by the

laser drive circuitry, regulating the current through the laser diode.

ARM7 System

The following sections give a top-level description of the individual blocks.

7.1 ARM7TDMI-S microprocessor

The ARM7TDMI-S microprocessor is a member of the ARM family of 32-bit processors.

The ARM processor offers a high performance with low power consumption and low gate

count. The ARM architecture is based upon RISC. The RISC principles provide the

following key beneﬁts:

• High instruction throughput

• Excellent real-time interrupt response

Fig 37. Block diagram of laser control circuit

laser power

Vmon_dac

laser_comp_out

001aag348

UP/DOWN

COUNTER

TIMING AND CONTROL LOGIC

LASER DIODE

MONITOR

pin MONITOR

pin LASER

laser_ion

pin LPOWER

laser_pdmin

DAC

laser_dk8MHz

laser_dk32MHz

DAC

comparator

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