ADV7305AKST Analog Devices Inc, ADV7305AKST Datasheet - Page 46

• Manufacturer Part Number: ADV7305AKST
• Description: IC ENCODER VIDEO 14BIT 64LQFP
• Manufacturer: Analog Devices Inc
• Type: Video Encoderr

Specifications of ADV7305AKST

• Applications: DVD, SD/HD
• Voltage - Supply, Analog: 2.5V
• Voltage - Supply, Digital: 2.5V
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Number Of Dac's: 6
• Adc/dac Resolution: 14b
• Screening Level: Commercial
• Package Type: LQFP
• Pin Count: 64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADV7304A/ADV7305A
HD Sharpness Filter and Adaptive Filter Application Examples
HD Sharpness Filter Application
The HD sharpness filter can be used to enhance or attenuate
the Y video output signal.
The register settings in Tables XIX and XX are used to achieve
the results shown in Figure 64. Input data was generated by an
external signal source.
Address
00h
01h
02h
10h
11h
20h
20h
20h
20h
20h
20h
*See Figure 64.
The effect of the sharpness filter can also be seen when using the
internally generated crosshatch pattern.
Address
00h
01h
02h
10h
11h
20h
In toggling the Sharpness Filter Enable Bit [Address 11h,
Bit 8], it can be seen that the line contours of the crosshatch
pattern change their sharpness.
Table XX. Sharpness Filter on Internal Test Pattern
Table XIX. Sharpness Filter on Frequency Sweep
Figure 64. HD Sharpness Filter Control with Different Gain Settings for HD Sharpness Filter Gain Value
Register Setting
FCh
10h
20h
00h
81h
00h
08h
04h
40h
80h
22h
Register Setting
FCh
10h
20h
00h
85h
99h
Reference*
a
b
c
d
e
f
a
b
c
–46–
Adaptive Filter Control Application
Figure 65 shows a typical signal to be processed by the adaptive
filter control block.
The register settings in Table XXI are used to obtain the results
shown in Figure 66, i.e., to remove the ringing on the Y signal.
Input data was generated by an external signal source.
Figure 66. Output Signal after Adaptive Filter Control
Figure 65. Input Signal to Adaptive Filter Control
d
e
f
@: 446mV
@: 12.8ms
@: 446mV
@: 12.8ms
: 692mV
: 332ns
: 690mV
: 332ns
REV. A