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參數(shù)資料
| 型號(hào)： | PCA84C646 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Microcontrollers for TV tuning control and OSD applications(應(yīng)用于TV調(diào)頻和OSD的微控制器) |
| 中文描述： | 微控制器的控制和調(diào)整（應(yīng)用于電視調(diào)頻和OSD的微控制器應(yīng)用的電視OSD） |
| 文件頁數(shù)： | 17/72頁 |
| 文件大小： | 564K |
| 代理商： | PCA84C646 |
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1995 Jun 15
17
Philips Semiconductors
Preliminary specification
Microcontrollers for TV tuning
control and OSD applications
PCA84C646; PCA84C846
9.4.1
M
OUNTING PRECAUTIONS
To achieve good OSD performance, take the following
precautions for the microcontroller mounting:
Apply the recommended R, C
s
and C
p
(PLL loop filter)
values as shown in Fig.12 and place them as close as
possible to pin C (41).
To guarantee stable PLL operation, apply a noise-free
HSYNC signal (pin 6).
Avoid heavy loading of the output pins.
The supply voltage (V
DD
) must be correctly decoupled.
Connect decoupling capacitors as close as possible to
the V
DD
and V
SS
pins.
Position microcontroller optimal and away from
components bearing high voltage and/or strong current.
PLL loop filter ground of capacitors C
s
and C
p
must be
directly connected to the V
SS
pin (21). Avoid a ground
loop and separate the ground from other digital signals
ground.
The connection between V
SS
pin (21) and +5 V regulator
ground/switching power supply secondary ground must
be as short as possible.
Fig.12 On-chip OSD oscillator.
handbook, full pagewidth
MED196
VOLTAGE
CONTROLLED
OSCILLATOR
CHARGE PUMP
AND
LOOP FILTER
PHASE/
FREQUENCY
DETECTOR
ACTIVE
LEVEL
DETECTOR
PROGRAMMABLE
7-BIT COUNTER
fOSD
(OSD clock)
divided by N
STANDBY
f2
HSYNC
16
OSD disable
C
Cs
fVCO
Cp
R
(2)
(1)
(1) R = 10 to 47 k
; typ. 15 k
.
C
s
= 100 to 470 nF; typ. 220 nF.
C
p
=
1
10
C
s
.
For mounting see Section 9.4.1 “Mounting precautions”.
(2) Example:
If f
= 15.750 kHz and (decimal value of 7-bit counter) = 32 then f
VCO
= 8.064 MHz
and the output of the Programmable 7-bit counter is 15.750 kHz.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| PCA84C646P | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Microcontrollers for TV tuning control and OSD applications |
| PCA84C64X | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| PCA84C822 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontrollers for remote control transmitters |
| PCA84C822A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontrollers for remote control transmitters |
| PCA84C822AP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontrollers for remote control transmitters |
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