SP8056

Rev 1 (9-17-03): SP8056 – High Speed 10 Channel PDIC

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page

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

Vs

Gain 2

Gain 1

Gain 3

EF

SAD

GH

SBC

Vcc

RF+

RF-

C

B

D

A

GND

SP8056

16-Pin

OPLGA

FEATURES

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Dual wavelength 650 and 780nm

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Data channel bandwidth 130 MHz

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Eleven selectable gain settings covering 42dB range

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Group delay error less than 1ns up to 72MHz

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Slew rate up to 400V/us

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Small 16-pin OPLGA package

APPLICATION

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DVD-RAM with CD-RW capability

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DVD-RW with CD-RW capability

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Writable data storage optical devices

GENERAL DESCRIPTION

The SP8056 is a ten channel photo detector IC (PDIC) specially designed for high speed DVD-

RAM and DVD-RW applications and can operate at wavelength of 650 and 780 nm. The ten

channels consist of four high speed channels (A, B, C, and D), two average speed channels (EF

and GH), two slow channels (SAD and SBC), and two channels with paraphase output (RF+

and RF-). The EF and GH channels output is sum of signals from E + F and G + H sensors

respectively. The RF channels output is sum of A + B + C + D + EF + GH channels with

identical weights. Low noise operation enables data recovery at very low signal levels.

The SP8056 has three logic inputs for gain control, one of them operating as TTL compatible

(Gain 1), and two other operating as three state logic inputs (Gain 2 and Gain 3). The allowable

14 logic states are used to select 11 gain factors, an adjustment mode, and a sleep mode (see

table 4). Adjustment mode is used to adjust the position of the PDIC with respect to the laser

beam. In this mode each of the sensors E, F, G, and H is connected to the input of EF, GH,

SAD, and SBC channels respectively instead of the standard configuration.

In sleep mode all channels are in tri-state condition.

The SP8056 is manufactured with an advanced 10GHz BICMOS technology.

High Speed 10-channel Photo Detector IC