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CXA1372BS Datasheet(PDF) 18 Page - Sony Corporation

Part # CXA1372BS
Description  RF Signal Processing Servo Amplifier for CD Player
Download  32 Pages
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Manufacturer  SONY [Sony Corporation]
Direct Link  http://www.sony.co.jp
Logo SONY - Sony Corporation

CXA1372BS Datasheet(HTML) 18 Page - Sony Corporation

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CXA1372BQ/BS
Commands
The input data to operate this IC is configured as 8-bit data; however, below, this input data is represented by
2-digit hexadecimal numerals in the form $XX, where X is a hexadecimal numeral between 0 and F.
Commands for the CXA1372 can be broadly divided into four groups ranging in value from $0X to $3X.
1. $0X (“FZC” at SENS (Pin 27))
These commands are related to focus servo control.
The bit configuration is as shown below.
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
FS4
FS3
FS2
FS1
Four focus-servo related switches exist: FS1 to FS4 corresponding to D0 to D3, respectively.
$00
When FS1 = 0, Pin 7 is charged to (22µA – 11µA)
× 50kΩ = 0.55V.
If FS2 = 0, this voltage is no longer transferred, and the output at Pin 5 becomes 0V.
$02
From the state described above, the only FS2 becomes 1. When this occurs, a negative signal is output
to Pin 5. This voltage level is obtained by equation 1 below.
(22µA – 11µA)
× 50kΩ ×
....
Equation 1
$03
From the state described above, FS1 becomes 1, and a current source of +22µA is split off.
Then, a CR charge/discharge circuit is formed, and the voltage at Pin 7 decreases with the time as
shown in Fig. 1 below.
This time constant is obtained with the 50k
Ω resistance and an external capacitor.
By alternating the commands between $02 and $03, the focus search voltage can be constructed. (Fig. 2)
0V
0V
$
00 02
030203
02
00
Fig. 1. Voltage at Pin 7 when FS1 gose from 0
→ 1
Fig. 2. Constructing the search voltage by alternating between $02 and $03 (Voltage at Pin 5)
resistance between Pins 5 and 6
50k


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