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參數(shù)資料
| 型號： | TMC2491AR2C |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 顏色信號轉換 |
| 英文描述： | COLOR SIGNAL ENCODER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 14/36頁 |
| 文件大小： | 208K |
| 代理商： | TMC2491AR2C |
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PRODUCT SPECIFICATION
TMC2490A/TMC2491A
21
Filtering Within the TMC2490(1)A
The TMC2490(1)A incorporates internal digital lters to
establish appropriate bandwidths and simplify external ana-
log reconstruction lter designs.
The chroma portion of the incoming digital video is band-
limited to reduce edge effect and other distortions of the
image compression process. Chrominance bandwidth is
selected by CHRBW. When LOW, the chrominance pass-
band attenuation is <3 dB within
±650 kHz from fSC. The
stopband rejection is >26 dB outside fSC ±2 MHz. When
HIGH, the chrominance passband attenuation is <3 dB
within
±1.3 MHz from fSC. The stopband rejection is
>33 dB outside fSC ±4 MHz.
Figure 9. Color-Difference Low-Pass Filter Response
The Chroma Modulator output and the luminance data are
digitally ltered with sharp-cutoff low-pass interpolation l-
ters. These lters ensure that aliased subcarrier, chromi-
nance, and luminance frequencies are sufciently suppressed
above the video base-band.
Figure 10. Chrominance and Luminance Interpolation
Filter – Full Spectrum Response
-70
-60
-50
-40
-30
-20
-10
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5
Frequency (MHz)
Attenuation
(dB)
24490A
Wideband
Narrowband
-70
-60
-50
-40
-30
-20
-10
0
1
2
3
4
5
6
7
8
9
10 11 12 13
Frequency (MHz)
Attenuation
(dB)
24487A
Virtually all digital-to-analog converters have a response
with high frequency roll-off as a result of the zero-order hold
characteristic of classic D/A converters. This response is
commonly referred to as a sin(x)/x response. The sin(x)/x vs.
sampling frequency is shown in Figure 12.
Figure 11. Chrominance and Luminance Interpolation
Filter – Passband Detail
The TMC2490(1)A’s digital interpolation lters convert the
data stream to a sample rate of twice the pixel rate. This
results in much less high frequency sin(x)/x rolloff and the
output spectrum between fS/4 and 3 x fS/4 contains very lit-
tle energy. Since there is so little signal energy in this fre-
quency band, the demands placed on the output
reconstruction lter are greatly reduced. The output lter
needs to be at to fS/4 and have good rejection at 3 x fS/4.
The relaxed requirements greatly simplify the design of a l-
ter with good phase response and low group delay distortion.
A small amount of peaking may be added to compensate
residual sin(x)/x rolloff.
Figure 12. Sin(x)/x Response
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
0.5
0
1
2
3
4
5
6
Frequency (MHz)
Attenuation
(dB)
24488A
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
Fs=13.5Msps
Fs=27.0Msps
(Oversampled)
Frequency (MHz)
Attenuation
(dB)
24489A
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| 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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