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參數(shù)資料
| 型號： | TZA1025 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Data amplifier and laser supply circuit for CD audio and video optical systems (ADALASLC)(應(yīng)用在CD音頻和視頻光學(xué)系統(tǒng)（ADALAS）中的數(shù)據(jù)放大器和激光電源電路) |
| 中文描述： | 數(shù)據(jù)放大器和激光CD音頻和視頻（ADALASLC）（應(yīng)用在光碟音頻和視頻光學(xué)系統(tǒng)（ADALAS）中的數(shù)據(jù)放大器和激光電源電路光學(xué)系統(tǒng)的電源電路） |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 122K |
| 代理商： | TZA1025 |
1998 Oct 30
8
Philips Semiconductors
Product specification
Data amplifier and laser supply circuit for CD
audio and video optical systems (ADALASLC)
TZA1025
Notes
1.
Closed-loop output impedance (10 k
feedback resistor connected between pins RFEQO and RFFB).
G
RF
= (G
RFEQO
at f
EQ
)
(G
RFEQO
at 720 kHz).
Values to be used in equation (1).
An RF filter of 1 k
and 47 pF should be used on the RF output.
V
drop
= V
DD(L)
V
o(LASER)
.
An external resistor can be used to reduce the maximum output current (and the gain) of the laser supply;
see equation (4).
The output impedance strongly depends on the drop voltage (V
drop
). The output impedance will approximately double
when the drop voltage doubles.
2.
3.
4.
5.
6.
7.
8.
9.
When a voltage dip at V
DD(L)
occurs it could cause peak currents on I
o(LASER)
coming out of the ALPC output.
To protect the laser against such peak currents a protection circuit will switch-off the laser current when V
drop
becomes lower than V
clamp
. When V
drop
> V
clamp
the laser will switch-on automatically again.
V
i(mon)
monitor input voltage
N-substrate
P-substrate
monitor input current
0.132
V
DD
0.168
200
0.150
V
DD
0.150
3
0.168
V
DD
0.132
+200
5
V
V
nA
ms
%
I
i(mon)
t
sw(on)(LASER)
laser switch-on time
RS
ref
reference supply
rejection
V
clamp
ALPC clamp voltage
note 8
note 9
0.5
V
Control inputs
Z
i(pd)
pull-down input
impedance pin CDRW
pull-up input
impedance
pin PWRON
LOW-level input
voltage
pin CDRW
pin PWRON
HIGH-level input
voltage
pin CDRW
pin PWRON
200
k
Z
i(pu)
200
k
V
IL
0.2
0.2
1
3
V
DD
1
3
V
DD
V
V
V
IH
2
3
V
DD
2
3
V
DD
V
DD
+ 0.2
V
DD
+ 0.2
V
V
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
RS
ref
V
V
V
DD
--V
-----------------
--------------
=
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