2242BKTC2 Просмотр технического описания (PDF) - Cadeka Microcircuits LLC.

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производитель

2242BKTC2

Digital Half-Band Interpolating/Decimating Filter 12-bit In/16-bit Out, 60 MHz

Cadeka Microcircuits LLC. 

TMC2242A/TMC2242B

PRODUCT SPECIFICATION

Timing Diagrams (continued)

OE

Three-State

Outputs

tDIS 0.5V

tENA

2.0V

0.8V

0.5V

High Impedance

65-2242A-11

Figure 9. Threshold Levels for Three State Measurements

Applications Discussion

The TMC2242A and TMC2242B are well-suited for filtering

digitized composite NTSC or PAL video. In Figure 10, the

TMC1175A 8-bit video A/D converter outputs, D7-0, are

connected to the TMC2242B inputs, SI11-4, respectively

(grounding SI3-0). The RND2-0 controls are set to 111 for a

9-bit rounded decimated output on SO15-7.

In Figure 11, the TMC2242B 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

TMC2242B outputs SO15-6, respectively. The TMC2242B

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

65-2242A-12

75 Ohm

D7

TMC1175A

VIN 8-bit A/D

7

D6-0

AGND

SI11

TMC2242B

MSB

SI10-4

SO15

DEC=0

TCO=INT=1

SO14-7 8

9

27.000 MHz (D1)

28.636 MHz (NTSC D2)

13.500 MHz (D1)

14.318 MHz (NTSC D2)

Figure 10. Decimating Oversampled Video With a Low Cost 8-bit A/D

TTL Clock

27.000 MHz (D1)

28.636 MHz (NTSC D2)

MSB

TMC2242B SO15

SI11

12

11 LSB SI10-0

SO14-6

9

TCO=1 INT=DEC=0

D9 TMC3003

10-bit D/A

D8-0

IOUT

AGND

75 Ohm

13.500 MHz (D1)

14.318 MHz (NTSC D2)

27.000 MHz (D1)

28.636 MHz (NTSC D2)

2 uH

510 pF

300 pF

Note: Data buses are unsigned binarys; TMC2242 input is two’s complement.

Figure 11. Interpolating Digital Video Signals before Reconstruction

2 uH

300 pF

Composite

Video

75 Ohm

65-2242A-13

11

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