參數(shù)資料
型號： TMC2376
廠商： Fairchild Semiconductor Corporation
英文描述： PC-to-TV Video Standards Converter(PC到TV視頻標準變換器)
中文描述： PC到電視視頻標準轉(zhuǎn)換器（電腦到電視視頻標準變換器）
文件頁數(shù)： 35/48頁
文件大?。?/td> 233K
代理商： TMC2376
TMC2376
PRODUCT SPECIFICATION
35
P
Figure 28. Reference Schematic, Microcontroller
Power and Ground
Within the TMC2376, separate power is routed to functional
sections: A/D converters, phase locked loops, D/A convert-
ers, digital processors and digital drivers. To minimize power
consumption, a 3.3 volt supply is used for the external
SDRAM interface and the internal line buffers. All ground
pins should be connected to a common ground plane. Power
pins should be segregated into analog and digital sections.
Clean analog power should be applied to the V
DDAD
, V
DDPA
,
V
DDPF
, and V
DDDA
pins. A 0.1
μ
F capacitor should be
placed adjacent to each group of pins. The capacitor con-
nected to C
BYPR
is critical, it must be connected to V
DDDA
to
minimize noise at the D/A converter outputs. Chip capacitors
are recommended.
Figure 29 depicts the strategy for distributing power. 5 volt
power for the analog and digital sctions is drived from a
common source. Filtered analog power is applied to the
V
DDAD
, V
DDPA
, V
DDPF
, and V
DDDA
pins. A 0.1
μ
F capacitor
is placed adjacent to each group of pins. The capacitor con-
nected to C
BYPR
is critical, it must be connected to V
DDDA
to
minimize noise at the D/A converter outputs. Chip capacitors
are recommended.
PLL power and ground implementation is critical to mini-
mize clock jitter. Ensure that:
1.
There is a solid ground plane in the proximity of the
PLL power pins.
A 1
μ
F ceramic NP capacitor de-coupling capacitor is
installed adjacent to the PLL power and ground pins.
A series 100
resistor is inserted in each PLL 5 volt
supply.
5 VDC power is clean, preferably being supplied from a
linear regulator in close proximity.
2.
3.
4.
Digital power may be derived from system digital +5 volts. If
necessary insert a ferrite bead in series with the supply trace.
A 47
μ
F capacitor should be placed across the common +5
VDC for V
DD5
, V
DDAD
and V
DDDA
to act as a reservoir for
heavy currents drawn by D/A converters and memory. At
least one 0.1
μ
F capacitor should be located adjacent to
V
DD3
and V
DD5
pins along each side of the TMC2376 to
supply transient currents.
R13
10K
R12
10K
R14
330
R15
220
R16
10K
U7
AT89C2051 20 PIN SOIC
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
12
13
14
15
16
17
18
19
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
2
3
6
7
8
9
P3.7
11
XTAL2
XTAL1
4
5
RST
1
V
2
G
1
C13
0.1
C54
22uF/10v
+
VDD5A
VDD5A
VDD5A
VDD5A
CKMPU
SCL
SDA
HS
VS
RESETN
Microcontroller
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