S5L9250B View Datasheet(PDF) - Samsung

Part Name

Description

Manufacturer

S5L9250B

The CD-ROM 48X 1 chip receives the input signal read from the CD-DA/VIDEO-CD/CD-ROM disc after handling by the RF amplifier.

Samsung 

S5L9250B

DATA SHEET

Block Description

• Analog (A/D) interface block:

This block receives servo errors such as focus and tracking errors, and carries out input gain control

functions such as A/D conversion in order to heighten the rate of ADC deconstruction. It also has a TZC, a

MIRR comparator feature, a VREF generating feature, and a built-in 8ch dividing MUX.

• Timing generator:

The timing generator generates various timings used within the servo utilizing the external crystal

33.8688MHz. It also uses the built-in PLL's 40MHz as the basic signal for timing generation.

• I/O interface block:

This block accepts externally generated signals such as lock and SSTOP, and outputs internally generated

signals. It outputs various monitor signals such as ATSC and FOKB.

• RF interface block:

This block transmits various automatic adjustment outputs and data needed by the RF, such as

focus/tracking offset, TBAL output, AGC output, LD on/off, MICOM data, etc.

• MICOM interface block:

This block relays data between MICOM and 8-bit parallel.

• Track counter:

The track counter has a built-in 16-bit up/down counter to act as an accurate counter during jump.

It is 16-bit, allowing for full stroke counting.

• DA converter block:

This block uses a 10-bit DAC (R-string) to control the focus/tracking/sled0/sled1 at high resolution.

• Spindle PWM output:

This output is a 1-channel PWM output for spindle control (possible with sled)

• ROM:

This ROM is a servo program ROM with a built-in servo control program.

• DSP core for digital servo:

This block is central to the servo. It digitally handles various emergencies such as focus/tracking loop filter

handling, tracking jump, and sled move.

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