參數(shù)資料
型號(hào)： TMC2490AR2C
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 顏色信號(hào)轉(zhuǎn)換
英文描述： Multistandard Digital Video Encoder
中文描述： COLOR SIGNAL ENCODER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 31/36頁
文件大?。?/td> 510K
代理商： TMC2490AR2C
PRODUCT SPECIFICATION
TMC2490A
REV. 1.0.2 2/27/02
31
Applications Information
The circuit in Figure 24 shows the connection of power sup-
ply voltages, output reconstruction filters and the external
voltage reference. All VDD pins should be connected to the
same power source.
The full-scale output voltage level, V
OUT
, on the COMPOS-
ITE, LUMA, and CHROMA pins is found from:
V
OUT
= I
OUT
x R
L
= K x I
REF
x R
L
= K x (V
REF
/R
REF
) x R
L
where:
I
OUT
is the full-scale output current sourced by the
TMC2490A D/A converters.
R
L
is the net resistive load on the COMPOSITE,
CHROMA, and LUMA output pins.
K is a constant for the TMC2490A D/A converters
(approximately equal to 10.4).
I
REF
is the reference current flowing out of the R
REF
pin
to ground.
V
REF
is the voltage measured on the V
REF
pin.
R
REF
is the total resistance connected between the R
REF
pin and ground.
A 0.1
μ
F capacitor should be connected between the C
BYP
pin and the adjacent V
DDA
, pin.
The reference voltage in Figure 24 is from an LM185 1.2
Volt band-gap reference. The 392 Ohm resistor connected
from R
REF
to ground sets the overall "gain" of the three D/A
converters of the TMC2490A. A 787
resistor is used for
single 75
termination. Varying R
REF
±
5% will cause the
full-scale output voltage on COMPOSITE, LUMA, and
CHROMA to vary by
±
5%.
The suggested output reconstruction filter is the same one
used on the TMC2063P7C Demonstration Board. The phase
and frequency response of this filter is shown in Figure 23.
The Schottky diode is for ESD protection.
Figure 23. Response of Recommended Output Filter
-40
-50
-60
-30
-20
-10
0
-120
-160
-200
25
24365A
-80
-40
0
40
0
5
10
15
20
Frequency (MHz)
Analog Reconstruction Filter
A
P
Figure 24. Typical Application Circuit
+5V
+5V
+5V
TMC2490A
Multistandard
Digital Video
Encoder
MPEG-2
Decoder
VDD
GND
PXCK
CHROMA
VIDEO
FROM
ENCODER
VIDEO
OUTPUT
TO 75
LOAD
75
1.0
μ
H
1.8
μ
H
27pF
330pF
330pF
1N5818
75
100pF
65-2490(1)A-03
VSYNC
HSYNC
PD
7-0
PIXCLK
B/T
HSYNC
YC
7-0
PDC
SELC
10
μ
F
LPF
27.0 MHz
CLOCK
CONTROL INTERFACE
V
I
0.1
μ
F
0.1
μ
F
0.1
μ
F
392
3.3k
LM185-1.2
S
R
S
S
D
7
S
S
LUMA
COMPOSITE
C
BYP
V
REF
V
DDA
R
REF
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TMC2490AR2CT 功能描述:視頻 IC RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
TMC249A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:High Current Microstep Stepper Motor Driver with sensorless stall detection, protection / diagnostics and SPI Interface
TMC249-A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:High Current Microstep Stepper Motor Driver with Sensorless Stall D e t e c t i o n ,P rotection / Diagnosis and SPI Interface
TMC249A-LA 制造商:Trinamic 功能描述:IC BRIDGE DRIVER SPI/ANLG 32QFN
TMC249A-SA 制造商:Trinamic 功能描述:STEPPER MOTOR DRIVER SMD SO-28 制造商:Trinamic 功能描述:STEPPER MOTOR DRIVER, SMD, SO-28 制造商:Trinamic 功能描述:IC MOTOR DRIVER, FULL BRIDGE, 1mA SOIC-28; Motor Type:Full Bridge; No. of Outputs:8; Output Current:1mA; Output Voltage:34V; Driver Case Style:SOIC; No. of Pins:28; Supply Voltage Min:3V; Supply Voltage Max:5.5V; MSL:MSL 2 - 1 year ;RoHS Compliant: Yes
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