EVAL-ADV7173EBZ Analog Devices Inc, EVAL-ADV7173EBZ Datasheet - Page 39

• Manufacturer Part Number: EVAL-ADV7173EBZ
• Description: EVALUATION BOARD
• Manufacturer: Analog Devices Inc
• Series: Advantiv®r

Specifications of EVAL-ADV7173EBZ

• Main Purpose: Video, Video Processing
• Embedded: No
• Utilized Ic / Part: ADV7173
• Primary Attributes: NTSC/PAL Digital Video Encoder
• Secondary Attributes: I²C Interface
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

COLOR CONTROL REGISTERS 2–1 (CC2–CC1)
(Address (SR4–SR0) = 1EH–1FH)
The color control registers are 8-bit-wide registers used to scale
the U and V output levels. Figure 64 shows the operations
under control of these registers.
CC1 BIT DESCRIPTION
Reserved (CC17–CC16)
A Logic “0” must be written to these bits.
U Scalar Value (CC15–CC10)
These six bits represent the value required to scale the U level
from 0.75 to 1.25 of its initial level. The value of these six bits is
calculated using the following equation:
where X = Scaling factor for U
e.g., Scale U by 0.8
(rounded to the nearest integer)
CC2 BIT DESCRIPTION
Reserved (CC27–CC26)
A Logic “0” must be written to these bits.
Color Control Register 1 = (0.8 – 0.75) × 128 = 6.4 = 000110
Color Control Register 1 = (X – 0.75) × 128
CC17
CC27
HCR7
TO THESE BITS
TO THESE BITS
ZERO SHOULD
ZERO SHOULD
BE WRITTEN
BE WRITTEN
CC17–CC16
CC27–CC26
CC16
CC26
HCR6
CC15
CC25
HCR5
HUE ADJUST VALUE
CC24
CC14
HCR4
HCR7–HCR0
V Scalar Value (CC25–CC20)
These six bits represent the value required to scale the V pixel
data from 0.75 to 1.25 of its initial level. The value of these six
bits is calculated using the following equation:
where X = Scaling factor for V
e.g., Scale V by 1.2
(rounded to the nearest integer)
HUE CONTROL REGISTER (HCR)
(Address (SR5–SR0) = 20H)
The hue control register is an 8-bit-wide register used to adjust
the hue on the composite and chroma outputs. Figure 65 shows
the operation under control of this register.
HCR BIT DESCRIPTION
Hue Adjust Value (HCR7–HCR0)
These eight bits represent the value required to vary the hue of
the video data, i.e., the variance in phase of the subcarrier with
respect to the phase of the subcarrier during the color burst.
The ADV7172/ADV7173 provides a range of ± 22° in incre-
ments of 0.17578125°. For normal operation (zero adjustment)
this register is set to 80 Hex. FFHex and 00Hex represent the
upper and lower limit (respectively) of adjustment attainable.
CC23
CC13
HCR3
U SCALAR VALUE
V SCALAR VALUE
Color Control Register 2 = (1.2 – 0.75) × 128 = 57.6 = 111001
CC15–CC10
CC25–CC20
Hue Adjust = (0.17568125 × [HCR7 – HCR0 – 128]).
CC12
CC22
HCR2
Color Control Register 2 = (X – 0.75) × 128
CC21
HCR1
CC11
CC10
CC20
HCR0
ADV7172/ADV7173