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參數(shù)資料
| 型號(hào)： | LC78647NT |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | 14 X 14 MM, TQFP-100 |
| 文件頁數(shù)： | 8/17頁 |
| 文件大小： | 175K |
| 代理商： | LC78647NT |
LC78647NT
-16-
6. Notes on Thermal Design
The failure rate of semiconductor devices is accelerated by higher ambient temperatures and power
dissipation levels. We strongly recommend taking changes in ambient conditions into account and
providing as large a margin as possible in thermal design to assure high reliability.
7. Notes on Printed Circuit Board Design Patterns
— Ideally, the influence of shared impedances should be minimized by separating the VDD and ground
lines for each system.
— Design VDD and ground lines to be as short and wide as possible, and to have the lowest high-
frequency impedance possible. Ideally, decoupling capacitors (0.01 to 1
F) should be inserted in
each VDD/ground pair. These capacitors should be placed as close to the corresponding VDD pin as
possible. It is also appropriate to insert capacitors of about 100 to 220
F between each VDD and
ground as low-frequency filters. However, be careful not to use values that are too large for these
capacitors, since this can result in latch-up.
- In the servo system, the reference voltage line (VREF) and the driver VCC and ground lines are
handled in the same way. The driver ground should be made especially wide. If at all possible, use
the recommended driver pattern, which, being directly under the device, was also designed to
provide a heat dissipation effect as well.
- If a current output pickup is used, locate the optimal pickup element and the connector and the
FIN1 and FIN2 pins as close together as possible. Even if a voltage output type pickup is used, the
I/V conversion resistor connected to the FIN1 and FIN2 pins should be located near these pins.
— The EFM signal line should be made as short as possible, and should either be located away from
adjacent lines or should be shielded from adjacent lines by VSS or VDD shield lines.
— Noise on the microcomputer interface can cause incorrect operation. In general, interface lines should
be kept short to minimize inductance and capacitance. However, care must be taken concerning
crosstalk. When interface lines are long or when there is a large amount of external noise, insertion of
a noise cancellation circuit is effective. A filter should be used that takes interface timing into
consideration.
— Cover the area around the crystal with the ground pattern.
8. Notes on Software Design
— Any prohibitions or recommendations concerning the software design phase given in the
documentation should be observed.
— When using digital OUT, if UBIT OFF is set initially, this is effective for DIR unlocking prevention
and prevention of subcode misidentification. Set UBIT ON only for playback.
9. Other Notes
If you have any questions during the application design phase, do not hesitate to contact your Sanyo
sales representative or the nearest Sanyo semiconductor sales office.
This IC is specifically designed for use in CD players, and as such its specifications differ from those of
general-purpose product standard logic ICs. We recommend system debugging using the end product
system itself and adopting failsafe system design if required by the application.
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