ADV7321KSTZ Analog Devices Inc, ADV7321KSTZ Datasheet - Page 54

• Manufacturer Part Number: ADV7321KSTZ
• Description: IC VID ENC 6-12BIT DAC'S 64LQFP
• Manufacturer: Analog Devices Inc
• Type: Video Encoderr

Specifications of ADV7321KSTZ

• Applications: EVD, DVD, SD/PS/HDTV
• Voltage - Supply, Analog: 2.5V
• Voltage - Supply, Digital: 2.5V
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Input Format: Digital
• Output Format: Analog
• Supply Voltage Range: 2.375V To 2.625V
• Operating Temperature Range: 0°C To +70°C
• Tv / Video Case Style: LQFP
• No. Of Pins: 64
• Msl: MSL 1 - Unlimited
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADV7320/ADV7321
For lengths of 16 to 240 points, the gamma correction curve is
calculated as follows:
where:
y = gamma corrected output.
x = linear input signal.
γ = gamma power factor.
To program the gamma correction registers, calculate the seven
values for y using the following formula:
where:
x
n = 24, 32, 48, 64, 80, 96, 128, 160, 192, or 224.
y
gamma correction register.
For example,
where the sum of each equation is rounded to the nearest
integer.
The gamma curves in Figure 71 and Figure 72 are only examples;
any user-defined curve is acceptable in the range of 16 to 240.
n
(n − 16)
= value for y along the y-axis, which must be written into the
y = x γ
y
y
y
y
y
y
y
y
y
y
y
24
32
48
64
80
96
128
160
192
224
= value for x along x-axis at points n.
n
= [(8/224)0.5 × 224] + 16 = 58
= [(16/224)0.5 × 224] + 16 = 76
= [(32/224)0.5 × 224] + 16 = 101
= [(48/224)0.5 × 224] + 16 = 120
= [(64/224)0.5 × 224] + 16 = 136
= [(80/224)0.5 × 224] + 16 = 150
=
= [(112/224)0.5 × 224] + 16 = 174
= [(144/224)0.5 × 224] + 16 = 195
= [(176/224)0.5 × 224] + 16 = 214
= [(208/224)0.5 × 224] + 16 = 232
⎡
⎢
⎣
(
240
x
(
n
−
−
16
16
)
)
⎤
⎥
⎦
γ
×
(
240
−
16
)
+
16
Rev. A | Page 54 of 88
Figure 71. Signal Input (Ramp) and Signal Output for Gamma 0.5
300
250
200
150
100
300
250
200
150
100
Figure 72. Signal Input (Ramp) and Selectable Output Curves
50
50
0
0
0
0
GAMMA CORRECTION BLOCK OUTPUT TO A RAMP INPUT
GAMMA CORRECTION BLOCK TO A RAMP INPUT FOR
50
50
SIGNAL INPUT
VARIOUS GAMMA VALUES
100
100
LOCATION
LOCATION
0.5
1.5
1.8
0.3
0.5
SIGNAL OUTPUT
150
150
200
200
250
250