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TDA4821P Datenblatt(PDF) 7 Page - NXP Semiconductors

Teilenummer TDA4821P
Bauteilbeschribung  Autosize IC for colour monitors
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Hersteller  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA4821P Datenblatt(HTML) 7 Page - NXP Semiconductors

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2000 Feb 09
7
Philips Semiconductors
Product specification
Autosize IC for colour monitors
TDA4821P
Table 1
Vertical timing measurements
TIMING
BITS
CONDITIONS
VsWidth
8
trailing edge of pulse on pin VS
VfstVid
12
first line with active video on pins VIN1, VIN2 or VIN3
VlstVid
12
last line with active video on pins VIN1, VIN2 or VIN3
Vperiod
12
next leading edge of pulse on pin VS
handbook, full pagewidth
MHB653
VlstVid
Vperiod
VsWidth
VfstVid
vertical sync
(pin VS)
R, G, B video inputs
(pins VIN1, VIN2, VIN3)
horizontal sync
Fig.3 Vertical timing.
HORIZONTAL TIMING MEASUREMENTS
The parameters are measured with respect to the leading
edge of the H-sync pulses (see Fig.4). At the leading edge
of the H-sync pulse on pin HS a 12-bit clock counter is
started (nominal internal clock frequency is 48 MHz).
The six horizontal timings (see Table 2) are countered as
a number of internal clock pulses and stored in buffer
registers. The contents of these buffer registers are copied
to the I2C-bus data registers on every next leading edge of
the V-sync pulse with the addition of LSBs (logic 0) for
completing the full 2-byte data.
The measurements of HsWidth, Hperiod, Hfbstrt and
Hfbstop in line 64 prevent wrong data capturing caused by
post-equalizing sync pulses.
The minimum horizontal frequency is 12 kHz and Hperiod
displays the full 12 bits. At 125 kHz, the shorter Hperiod
will display 9 bits only but the resolution is still better
than 0.25%.


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