ADV7196A datasheet(22/36 Pages) AD

Part #	ADV7196A

Description	Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs, 10-Bit Data Input, and Macrovision

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REV. 0

ADV7196A

–22–

250

200

150

100

50

0

300

SIGNAL OUTPUTS

SIGNAL

INPUT

0.5

GAMMA CORRECTION BLOCK OUTPUT

TO A RAMP INPUT FOR VARIOUS GAMMA VALUES

0

50

100

150

200

250

LOCATION

0.3

1.5

1.8

Figure 36. Signal Input (Ramp) and Selectable Gamma

Output Curves

The gamma curves shown above are examples only, any user

defined curve is acceptable in the range of 16–240.

SHARPNESS FILTER CONTROL AND ADAPTIVE

FILTER CONTROL

There are three Filter modes available on the ADV7196A: one

Sharpness Filter mode and two Adaptive Filter modes.

SHARPNESS FILTER MODE

To enhance or attenuate the Y signal in the frequency ranges shown

in Figure 37, the following register settings must be used:

Sharpness Filter must be enabled (MR17 = “1”) and Adaptive

Filter Control must be disabled (MR57 = “0”).

To select one of the 256 individual responses, the according gain

values for each filter, which range from –8 to +7, must be pro-

grammed into the Filter Gain register.

ADAPTIVE FILTER MODE

The Adaptive Filter Threshold A, B, C registers, the Adaptive

Filter Gain 1, 2, 3 registers and the Filter Gain register are used

in Adaptive Filter mode. To activate the Adaptive Filter control,

Sharpness Filter must be enabled (MR17 = “1”) and Adaptive

Filter Control must be enabled (MR57 = “1”).

The derivative of the incoming signal is compared to the three pro-

grammable threshold values: Adaptive Filter Threshold A, B, C.

The edges can then be attenuated with the settings in Adaptive

Filter Gain 1, 2, 3 registers and Filter Gain register.

According to the settings of the Adaptive Mode control (MR56),

there are two Adaptive Filter Modes available:

1. Mode A: is used when Adaptive Filter Mode (MR56) is set

to “0.” In this case, Filter B (LPF) will be used in the adaptive

filter block. Also, only the programmed values for Gain B in

the Filter Gain, Adaptive Filter Gain 1, 2, 3 are applied when

needed. The Gain A values are fixed and can not be changed.

2. Mode B: is used when Adaptive Filter Mode (MR56) is set to

“1.” In this mode a cascade of Filter A and Filter B is used. Both

settings for Gain A and Gain B in the Filter Gain, Adaptive

Filter Gain 1, 2, 3 become active when needed.

FREQUENCY – MHz

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

02

4

6

8

10

12

14

–8

–7

–6

–5

–4

–3

–2

–1

0

1

2

3

4

5

6

7

FREQUENCY – MHz

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

02

46

8

10

12

14

–8

–7

–6

–5

–4

–3

–2

–1

0

1

2

3

4

5

6

7

SHARPNESS AND ADAPTIVE FILTER CONTROL MODE

INPUT SIGNAL: STEP

FREQUENCY – MHz

1.6

1.5

1.4

1.3

1.2

1.1

1.0

02

46

8

10

12

14

FREQUENCY RESPONSE IN SHARPNESS FILTER MODE

WITH KA = 3 and KB = 7

Figure 37. Sharpness and Adaptive Filter Control Mode

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