SAF7849HL/M295,557 NXP Semiconductors, SAF7849HL/M295,557 Datasheet - Page 66

• Manufacturer Part Number: SAF7849HL/M295,557
• Description: IC AUD DECODER 144LQFP
• Manufacturer: NXP Semiconductors
• Type: Audio Decoderr

Specifications of SAF7849HL/M295,557

• Applications: Audio CD
• Voltage - Supply, Analog: 3 V ~ 3.6 V
• Voltage - Supply, Digital: 1.8V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 144-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 935287932557

NXP Semiconductors
7. ARM7 System
SAF784X_2
Product data sheet
Fig 37. Block diagram of laser control circuit
laser power
DAC
6.10 Laser interface
7.1 ARM7TDMI-S microprocessor
laser_dk32MHz
laser_dk8MHz
The laser diode pre-amp function is built in to the SAF784x and is illustrated in
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.
The following sections give a top-level description of the individual blocks.
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:
Vmon_dac
•
•
High instruction throughput
Excellent real-time interrupt response
comparator
laser_comp_out
TIMING AND CONTROL LOGIC
One chip CD audio device with integrated MP3/WMA decoder
Rev. 02 — 9 May 2008
COUNTER
UP/DOWN
laser_pdmin
DAC
pin LPOWER
laser_ion
pin LASER
LASER DIODE
MONITOR
pin MONITOR
&
SAF784x
© NXP B.V. 2008. All rights reserved.
001aag348
Figure
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37.