TW2802-FA Intersil, TW2802-FA Datasheet - Page 14

• Manufacturer Part Number: TW2802-FA
• Description: IC DECODER VIDEO NTSC/PAL
• Manufacturer: Intersil
• Type: Video Decoderr

Specifications of TW2802-FA

• Applications: Security Systems
• Mounting Type: Surface Mount
• Package / Case: 128-BFQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TW2804/TW2802 Multiple Video Decoder
ACC (Automatic Color gain control)
The ACC (Automatic Color gain Control) compensates for reduced amplitudes caused by high
frequency suppression in video signal. The range of ACC is from –6dB to 30dB approximately.
For black & white video or very weak & noisy signals, the color will be off by the internal color
killing circuit. The color killer function can also be always enabled or disabled by programming
CKIL (0x14, 0x54, 0x94, 0xD4) register.
Chrominance Gain, Offset and Hue Adjustment
The color saturation can be adjusted by changing the register SAT (0x10, 0x50, 0x90, 0xD0).
The Cb and Cr gain can be also adjusted independently by programming UGAIN (0x3C) and
VGAIN (0x3D) register. Likewise, the Cb and Cr offset can be programmed through U_OFF
(0x3E) and V_OFF (0x3F) registers. Hue control is achieved with phase shift of the digitally
controlled oscillator. The phase shift can be programmed through HUE (0x0F, 0x4F, 0x8F,
0xCF) register.
Techwell, Inc.
www.techwellinc.com
-10
-15
-20
-25
-30
-35
-40
-45
Fig. 6 The Characteristics of Chrominance Low Pass Filter
-5
0
0
0.5
1
1.5
Frequency (Hertz)
14
2
2.5
3
3.5
x 10
Datasheet Rev. 2.4
6
4
Preliminary
09/09/2003