- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358765 > LC78628 (Sanyo Electric Co.,Ltd.) 16-bit fixed point DSP with Flash PDF資料下載
參數(shù)資料
| 型號： | LC78628 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | 16-bit fixed point DSP with Flash |
| 中文描述： | 具有閃存的 16 位定點 DSP |
| 文件頁數(shù)： | 38/40頁 |
| 文件大?。?/td> | 241K |
| 代理商： | LC78628 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁當(dāng)前第38頁第39頁第40頁
Design Notes
While it goes without saying that the absolute maximum ratings, the allowable operating ranges, and the recommended
operating conditions for the LC78628E must be observed strictly to achieve reliable end products, care is also required
with respect to both the conditions in the applications operating environment, such as the ambient temperature and static
electricity, and the mounting conditions. This section presents notes on points that require particular attention during
design, mounting, and other times.
Handling Unused Pins
If this IC is operated with unused input pins in the open state, certain internal aspects may become unstable. If there are
specific instructions in the device documentation for handling specific pins when unused, be sure to follow those
instructions. Also be careful not to allow any output pins to be connected to power, ground, or any other output pin.
If any general-purpose I/O port is unused, it should either be set to function as an output port with a low-level output,
or it should be left as an input port with the level held fixed, either pulled up or pulled down.
Latch-Up Prevention
Due to the structure of the IC itself, the same potential must be applied to all of the 5 V system power supply pins.
* The same potential must also be applied to the servo system ASP. The slice level control circuit is shared with this
IC, and the same potential must be applied. Note that the same potential must be applied to all of the ASP power
supply pins.
The voltage levels on the input and output pins must not exceed V
DD
and must not fall below V
SS
. This point means
that the timing when power is first applied requires care.
Do not allow overvoltages or abnormal noise levels to be applied to this IC.
In general, latch-up can be prevented by applying either V
DD
or V
SS
to all unused input pins. However, the notes on
pin handling listed in the pin descriptions with this IC must be followed.
Do not short the outputs.
Interface
When the inputs and outputs of different devices are connected, differences between the input V
IL
/V
IH
and output
V
OL
/V
OH
levels can result in incorrect operation. When connecting devices with different supply voltages, such as
devices in dual power supply systems, always insert level shifters so that the devices are not destroyed.
Load Capacitances and Output Current
If large load capacitances are connected, the effective output short state may continue for an extended period and result
in overloaded wiring. Furthermore, high charge and discharge currents can cause noise leading to degraded
performance or incorrect operation. Only use loads with the recommended capacitance.
High output source and sink currents can also result in similar problems. Use the recommended current values while
taking the allowable power dissipation rating into account.
Notes on Power Application and Reset
There are points that require care when power is first applied, during a reset, and when the reset state is cleared. Refer
to the notes in the device spec sheet and adopt designs that are appropriate for the product.
The pin output states and I/O settings as well as the contents of the IC internal registers, are not guaranteed after power
is first applied. The states of items that are defined by the reset operation and by mode setting operations are only
guaranteed after those operations have been performed. After power is first applied, the application must perform a
reset operation. Note that the contents of registers and pin states that are undefined may change over time from their
values early in the design process due to long-term changes in sample-to-sample variations.
The general-purpose I/O ports go to the input state after a reset. From the standpoint of failsafe design, if any of these
pins must be tied high or low, one effective technique is to connect each one of these pins through an individual resistor
to either V
DD
(pull up) or V
SS
(pull down).
If the 4.2M output is used as the microcontroller master clock, the reset circuit should be shared with the
microcontroller. Since the microcontroller will not be reset unless a clock is supplied, the LC78628E reset input must
not be controlled from a microcontroller output port. If the LC78628E is not reset, there is no guarantee that the
4.2 MHz signal will be output, and the microcontroller will also not be reset. This can lead to the application failing to
operate correctly.
No. 6329-38/40
LC78628E
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LC78628E | 16-bit fixed point DSP with Flash |
| LC78630 | 16-bit fixed point DSP with Flash |
| LC78630E | 16-bit fixed point DSP with Flash |
| LC78631 | 16-bit fixed point DSP with Flash |
| LC78631E | 16-bit fixed point DSP with Flash |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LC78628E | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disc Player DSP with Built-in HDCD Decoder |
| LC7863 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:DIGITAL SIGNAL PROCESSOR FOR COMPACT DISC PLAYERS |
| LC78630 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disk Player DSP |
| LC78630E | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disk Player DSP |
| LC78631 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Compact Disk Player DSP |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。