TMC2192 datasheet(25/69 Pages) CADEKA

25 / 69 page

PRODUCT SPECIFICATION

TMC2192

REV. 1.0.0 8/13/03

Interpolation Filters

Each video output on the TMC2192 is digitally ﬁltered with

sharp-cutoff low-pass interpolation ﬁlters. These ﬁlters

ensure that the frequency band above base-band video and

below the pixel frequency (fS/4 to 3fS/4, where fS is the

PXCK frequency) are sufﬁciently suppressed.

Since these are ﬁxed-coefﬁcient digital ﬁlters, their ﬁlter

characteristics depend upon clock rate.

Figure 17. Interpolation Filter

Figure 18. Interpolation Filter – Passband Detail

x/Sin(x) Filter

Control Registers for this section

The TMC2192 contains a selectable X/sin(X) ﬁlter prior to

each DAC. The X/sin(X) ﬁlter boosts the high frequency

data to negate the sin(X)/X roll-off associated with D/A con-

verters.

Figure 19. X/SIN(X) Filter

Output Data Formats

Control Registers for this section

-80

-70

-60

-50

-40

-30

-20

-10

0.2

0.4

0.6

0.8

Frequency (Pixel rate)

-4

-3.5

-3

-2.5

-2

-1.5

-1

-0.5

0.5

0.1

0.2

0.3

0.4

0.5

Frequency (Pixel rate)

Address

Bit(s)

Name

0x11

SINEN

Address

Bit(s)

Name

0x10

LUMADIS

0x10

CHROMADIS

0x10

COMPDIS

0x3F

SEL_CLK

0x3F

SEL_PIX

-2

-1.5

-1

-0.5

0.5

1.5

0.1

0.2

0.3

0.4

0.5

Normalized Frequency (PXCK)

Compensated

D/A Output

Sin(x)/x D/A Roll-Off

X/Sin(x) Filter

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