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参数资料
| 型号： | TZA1024T |
| 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 ADALAS |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO14 |
| 文件页数： | 2/20页 |
| 文件大小： | 108K |
| 代理商： | TZA1024T |
1998 Oct 30
10
Philips Semiconductors
Product specication
Data amplier and laser supply circuit for CD
audio and video optical systems (ADALAS)
TZA1024
Notes
1. Closed-loop output impedance (10 k
between pins RFEQO and RFFB).
2. GRF =(GRFEQO at fEQ) (GRFEQO at f = 1 kHz) where:
a) fEQ = 720 kHz for n = 1 times speed (see Fig.5)
b) fEQ = 1440 kHz for n = 2 times speed (see Fig.6)
c) fEQ = not applicable for n = 4 times speed (see Fig.7).
3. The appropriate external filter (n = 1, 2 or 4) should be used (see Table 1).
4. Values to be used in equation (1).
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.
10. The pin EQSEL is a three level switch. When this pin is left open-circuit two internal resistors will keep the pin EQSEL
at 1
2VDD. This is the n = 4 times speed state. The two internal resistors are non-linear (when EQSEL = HIGH or LOW
the input or output current will be limited).
VIH
HIGH-level input
voltage
pin CDRW
2
3VDD
VDD + 0.2
V
pin PWRON
2
3VDD
VDD + 0.2
V
pin EQSEL
note 10
V
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
RS
ref
V
mon
V
mon
-----------------
V
DD
V
DD
---------------
------------------
=
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