TMC2242CKTC1 Ver la hoja de datos (PDF) - Fairchild Semiconductor
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TMC2242CKTC1
Fairchild Semiconductor
TMC2242CKTC1 Datasheet PDF : 16 Pages
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PRODUCT SPECIFICATION
TMC2242C
Applications Discussion
The TMC2242C is well-suited to filtering digitized compos-
ite or component NTSC or PAL video. In Figure 14, the
TMC1175A 8-bit video A/D converter outputs, D7-0, are
connected to the TMC2242C inputs, SI11-4, respectively. To
minimize noise and any chance of electrostatic damage,
inputs SI3-0 should be grounded. Controls RND2-0 are set to
100 and SO1 is forced high to effect 8-bit rounding. SO3-2,
TCO, and DEC are forced low, whereas INT and SO0 are
forced high. (Setting SO0 high and TCO low selects
unsigned binary format at the input and output data ports,
eliminating the need for external MSB inverters.)
In Figure 15, the TMC2242C drives a fast D/A converter to
reconstruct analog composite video. The TMC3003 10-bit
digital-to-analog converter inputs, D9-0 are connected to the
TMC2242C outputs SO15-6, respectively. The TMC2242C
RND2-0 controls are set to 110 for rounded 10-bit interpola-
tion operation.
TTL Clock
27.000 MHz (D1)
28.636 MHz (NTSC D2)
Composite
Video
75 Ohm
2 uH
2 uH
300 pF 510 pF
300 pF
65-2242C-12
75 Ohm
TMC1175A
VIN 8-bit A/D
8
D7-0
AGND
TMC2242C
SI11-4
SO15-8 8
27.000 MHz (D1)
28.636 MHz (NTSC D2)
13.500 MHz (D1)
14.318 MHz (NTSC D2)
Figure 12. Decimating Oversampled Video With a Low Cost 8-bit A/D
TCO = 0 RND = 100 SO(3:0) = 0011 DEC = 0 INT = 1
TTL Clock
27.000 MHz (D1)
28.636 MHz (NTSC D2)
TMC2242C
TMC3003
10-bit D/A
12
SI11-0
SO15-6
10
D9-0
IOUT
75 Ohm
AGND
13.500 MHz (D1)
14.318 MHz (NTSC D2)
27.000 MHz (D1)
28.636 MHz (NTSC D2)
2 uH
2 uH
510 pF 300 pF
300 pF
Composite
Video
75 Ohm
65-2242C-13
Note: Data buses are unsigned binary.
Figure 13. Interpolating Digital Video Signals before Reconstruction
TCO = 0 RND = 110 SO(3:0) = 0011 DEC = 0 INT = 0
12
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