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PDF SP3721A Data sheet ( Hoja de datos )
| Número de pieza | SP3721A | |
| Descripción | 6X DVD analog Front End Chip | |
| Fabricantes | Acer Laboratories | |
| Logotipo |  |
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SP3721A
6X DVD analog
Front End Chip
Confidential
Opto-Electronics & Systems Laboratories
Version 1.00 (June 2000)
1 page  
--Preliminary, Confidential, Proprietary--
SP3721A : 6x DVD Analog Front End Chip
Section 2: Pin Description
2.1 Pin Diagram
1 DVDRFP
2 DVDRFN
3 PD1
4 PD2
5 A2
6 B2
7 C2
8 D2
9 CP
10 CN
11 D
12 C
13 B
14 A
15 F
16 E
ALi
SP3721A
SDEN
SDATA
SCLK
LCP
LCN
CE
FE
TE
MEI
MEV
TPH
DFT
PI
MIN
MEVO
MLPF
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
Figure 2-1 Pinout Diagram
Page 4
Ver. 1.00, Document Number: 3721DSA1.doc
Acer Labs: 11F, no. 45 Tung Hsing Road, Taipei 110, Taiwan, R.O.C. Tel: 886-2-8768-2800 Fax: 886-2-8768-3030
Homepage : www.ali.com.tw
5 Page 
--Preliminary, Confidential, Proprietary--
SP3721A : 6x DVD Analog Front End Chip
Section 3 : Function Description
The SP3721A implements a high performance analog front-end, including RF summing amplifier, input attenuator,
AGC, programmable active equalizer/filter, and a servo block. The attenuator, AGC and programmable equalizer/ filter
support a wide bandwidth from CD-ROM 1x to 32x (RX=8.2kohm) speed signal rate and DVD ROM 1x to 32x (RX=8.2
kohm) speed signal rates and DVD -ROM 1x to 6x speeds. The servo block includes mirror detection, defect detection,
dual auto laser power control, tracking zero crossing, focus error, center error and tracking error detection circuits. (Fig.
1)
3.1 Input Interface
3.1.1 RF Interface
The SP3721A provides the RF interface for both DVD and CD signals. DVD signals can be AC coupled into the device
through the differential input pins DVDRFP and DVDRFN, while the CD signal interface is single-ended through the
CDRF pin. The type of interface can be selected by programming the CD/DVD bit (PDCR bit 3). This bit should be set
to 1 for the DVD interface, and 0 for the CD interface.
Input impedance of the RF signal is programmable from 10kohm to 40 kohm, single-ended and is controlled by the
RF input IMP bits (RFCR bits 7,6).
This device also provides an internal summing mode for the RF signal. In this mode, an RF signal is internally
generated by summing the DVD tracking servo inputs (A2, B2, C2, D2). The device will process this signal and ignore
any signals at the RF interface pins (DVDRFP, DVDRFN, CDRF). This mode can be enabled by setting the Internal RF
SEL bit (SIGR bit 3) to 1.
The following table outlines the control bits for the RF signal.
Internal RF SEL CD/DVD
RF signal
(SIGR bit 3)
(PDCR bit3)
0 0 CDRF
0 1 DVDRFP-DVDRFN
1 x A2+B2+C2+D2
Signal equalization is provided by a programmable filter, a wide bandwidth full wave rectifier, and a dual rate charge
pump.
3.1.2 Servo Interface
The SP3721A also provides the voltage-input interface for photo detector signals used in the servo block to detect
center errors, focusing errors and tracking errors. These signals include the output from the quad cell photo
detectors. (A, B, C, D) and CD photo detectors (E, F, PD1, PD2) which are directly connected from the pick-up and
require external IV or (OEIC) converters.
The A2, B2, C2, D2 inputs are provided for the Differential Phase tracking error detection (DPD) used in the DVD mode
(see Tracking Error Detection). These signals are the AC coupled version of the, B, C, D signals. All of these servo
inputs have a 10 kohm input impedance.
The DVDPD and CDPD inputs are provided for the Auto Power Laser Control circuits used to monitor the DVD and CD
laser, respectively (see Auto Laser Power Control). These inputs are high impedance pins.
Page 10
Ver. 1.00, Document Number: 3721DSA1.doc
Acer Labs: 11F, no. 45 Tung Hsing Road, Taipei 110, Taiwan, R.O.C. Tel: 886-2-8768-2800 Fax: 886-2-8768-3030
Homepage : www.ali.com.tw
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SP3721A.PDF ] | |
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