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参数资料
| 型号： | TZA1025T |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 消费家电 |
| 英文描述： | Data amplifier and laser supply circuit for CD audio and video optical systems ADALASLC |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO14 |
| 文件页数： | 15/16页 |
| 文件大小： | 99K |
| 代理商： | TZA1025T |
1998 Oct 30
8
Philips Semiconductors
Product specication
Data amplier 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).
2. GRF =(GRFEQO at fEQ) (GRFEQO at 720 kHz).
3. Values to be used in equation (1).
4. An RF filter of 1 k
and 47 pF should be used on the RF output.
5. Vdrop =VDD(L) Vo(LASER).
6. An external resistor can be used to reduce the maximum output current (and the gain) of the laser supply;
see equation (4).
7. The output impedance strongly depends on the drop voltage (Vdrop). The output impedance will approximately double
when the drop voltage doubles.
8.
9. When a voltage dip at VDD(L) occurs it could cause peak currents on Io(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 Vdrop
becomes lower than Vclamp. When Vdrop >Vclamp the laser will switch-on automatically again.
Vi(mon)
monitor input voltage
N-substrate
0.132
0.150
0.168
V
P-substrate
VDD 0.168
VDD 0.150
VDD 0.132
V
Ii(mon)
monitor input current
200
+200
nA
tsw(on)(LASER) laser switch-on time
3
ms
RSref
reference supply
rejection
note 8
5%
Vclamp
ALPC clamp voltage
note 9
0.5
V
Control inputs
Zi(pd)
pull-down input
impedance pin CDRW
200
k
Zi(pu)
pull-up input
impedance
pin PWRON
200
k
VIL
LOW-level input
voltage
pin CDRW
0.2
1
3VDD
V
pin PWRON
0.2
1
3VDD
V
VIH
HIGH-level input
voltage
pin CDRW
2
3VDD
VDD + 0.2
V
pin PWRON
2
3VDD
VDD + 0.2
V
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
RS
ref
V
mon
V
mon
-----------------
V
DD
V
DD
---------------
------------------
=
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