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TDA3592A Datasheet(PDF) 6 Page - NXP Semiconductors

Part # TDA3592A
Description  SECAM-PAL transcoder
Download  17 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA3592A Datasheet(HTML) 6 Page - NXP Semiconductors

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January 1988
6
Philips Semiconductors
Product specification
SECAM-PAL transcoder
TDA3592A
Sandcastle pulse detection
The sandcastle pulse detector requires a three-level sandcastle pulse to provide horizontal blanking, vertical blanking
and burst gate pulses. The detector burst gate pulse triggers a pulse generator which produces two timing pulses, pulse
‘A’ and pulse ‘B’ (see Fig.2). Pulse ‘A’ is used to time the PAL modulator burst and to sample the (R-Y) and (B-Y)
clamping pulse generators. A (R-Y) clamping pulse is generated only during a red line and a (B-Y) clamping pulse only
during a blue line. Pulse ‘B’ times the SECAM horizontal identification.
Carrier generation
The carrier signal for the PAL modulator is obtained from a 4,43 MHz oscillator. An internal Miller integrator operates in
conjunction with the decoupling capacitor at pin 10 to provide the required 90
° phase shift.
PAL matrix
The signal output from the PAL modulator at pin 9 is sequentially modulated with (R-Y) burst phased in the
+(R-Y)
direction, and (B-Y) burst phased in the
−(B-Y) direction. This PAL signal is applied directly to pin 11 and via a 64 µs
delay to pin 12. A true PAL signal is constructed in the PAL matrix by means of an additional/substraction process (in a
correct H/2 sequence) using the delayed and undelayed inputs.
Fig.2 Burst gate timing pulse generation.


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