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PDF VDP3104B Data sheet ( Hoja de datos )

Número de pieza VDP3104B
Descripción (VDP31xxB) Video Processor Family
Fabricantes Micronas Semiconductor 
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MICRONAS
PRELIMINARY DATA SHEET
VDP 31xxB
Video Processor Family
Edition Sept. 25, 1998
6251-437-2PD
MICRONAS

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VDP3104B pdf
PRELIMINARY DATA SHEET
VDP 31xxB
Video, Display, and Deflection Processor
Release Notes: This data sheet describes functions
and characteristics of the VDP 31xxB–C2. Revision
bars indicate significant changes to the previous
edition.
1. Introduction
The VDP 31xxB is a Video IC family of high-quality
single-chip video processors. Modular design and a
submicron technology allow the economic integration of
features in all classes of TV sets. The VDP 31xxB family
is based on functional blocks contained in the two chips:
VPC 3200A Video Processor and DDP 3300A Display
and Deflection Processor.
Each member of the family contains the entire video,
display, and deflection processing for 4:3 and 16:9
50/60 TV sets. Its performance and flexibility allow the
user to standardize his product development. Hardware
and software applications can profit from the modularity,
as well as manufacturing, systems support, or mainte-
nance. An overview of the VDP 31xxB video processor
family is shown in Fig. 1–1.
VDP 31xxB
Family
VDP 3104B
VDP 3108B
VDP 3112B
VDP 3116B
VDP 3120B
n nnn
n n nnnn
nn
nnnnn
n nnnnnn
nnnnnnnn
Fig. 1–1: VDP 31xxB family overview
CIN
VIN1
VIN2
VIN3
VIN4
VOUT
VRT
Color Bus
XREF
Analog
Frontend
AGC,
2*8bit ADC
2H
Adaptive
Combfilter
Color
Decoder
NTSC,
PAL,
SECAM
Horizontal
Scaler
Panorama
Mode
Display
Processor
RGB Matrix,
CLUT,
Scan Veloc.
Analog
Backend
3*10bit DAC,
Tube Control,
RGB Switch
20.25
MHz
Clock Gen.
DCO
I2C
Sync & Deflection
I2C
Fig. 1–2: Block diagram of the VDP 3120B
Micronas
H/V/EW
Measurement
ADC
Sense
RGB/FB IN1
RGB/FB IN2
Half Contrast
RGB OUT
SVM
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VDP3104B arduino
PRELIMINARY DATA SHEET
VDP 31xxB
2.3.2. Demodulator
The entire signal (which might still contain luma) is now
quadrature-mixed to the baseband. The mixing frequen-
cy is equal to the subcarrier for PAL and NTSC, thus
achieving the chroma demodulation. For SECAM, the
mixing frequency is 4.286 MHz giving the quadrature
baseband components of the FM modulated chroma.
After the mixer, a lowpass filter selects the chroma com-
ponents; a downsampling stage converts the color dif-
ference signals to a multiplexed half rate data stream.
The subcarrier frequency in the demodulator is gener-
ated by direct digital synthesis; therefore, substandards
such as PAL 3.58 or NTSC 4.43 can also be demodu-
lated.
2.3.3. Chrominance Filter
The demodulation is followed by a lowpass filter for the
color difference signals for PAL/NTSC. SECAM requires
a modified lowpass function with bell-filter characteristic.
At the output of the lowpass filter, all luma information is
eliminated.
The lowpass filters are calculated in time multiplex for
the two color signals. Three bandwidth settings (narrow,
normal, broad) are available for each standard. For PAL/
NTSC, a wide band chroma filter can be selected. This
filter is intended for high bandwidth chroma signals, e.g.
a nonstandard wide bandwidth S-VHS signal.
PAL/NTSC
SECAM
Fig. 26: Frequency response of chroma filters
Micronas
2.3.4. Frequency Demodulator
The frequency demodulator for demodulating the SE-
CAM signal is implemented as a CORDIC-structure. It
calculates the phase and magnitude of the quadrature
components by coordinate rotation.
The phase output of the CORDIC processor is differen-
tiated to obtain the demodulated frequency. After the
deemphasis filter, the Dr and Db signals are scaled to
standard CrCb amplitudes and fed to the crossover-
switch.
2.3.5. Burst Detection
In the PAL/NTSC-system the burst is the reference for
the color signal. The phase and magnitude outputs of
the CORDIC are gated with the color key and used for
controlling the phase-lock-loop (APC) of the demodula-
tor and the automatic color control (ACC) in PAL/NTSC.
The ACC has a control range of +30 ... 6 dB.
For SECAM decoding, the frequency of the burst is mea-
sured. Thus, the current chroma carrier frequency can
be identified and is used to control the SECAM proces-
sing. The burst measurements also control the color kill-
er operation; they can be used for automatic standard
detection as well.
2.3.6. Color Killer Operation
The color killer uses the burst-phase / burst-frequency
measurement to identify a PAL/NTSC or SECAM color
signal. For PAL/NTSC, the color is switched off (killed)
as long as the color subcarrier PLL is not locked. For SE-
CAM, the killer is controlled by the toggle of the burst fre-
quency. The burst amplitude measurement is used to
switch-off the color if the burst amplitude is below a pro-
grammable threshold. Thus, color will be killed for very
noisy signals. The color amplitude killer has a program-
mable hysteresis.
2.3.7. PAL Compensation / 1-H Comb Filter
The color decoder uses one fully integrated delay line.
Only active video is stored.
The delay line application depends on the color stan-
dard:
NTSC: 1-H comb filter or color compensation
PAL: color compensation
SECAM: crossover-switch
In the NTSC compensated mode, Fig. 27 c), the color
signal is averaged for two adjacent lines. Thus, cross-
color distortion and chroma noise is reduced. In the
NTSC combfilter mode, Fig. 27 d), the delay line is in
the composite signal path, thus allowing reduction of
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