TDA8505 Datasheet, PDF (4/32 Pages) NXP Semiconductors – SECAM encoder

Philips Semiconductors
SECAM encoder
Preliminary specification
TDA8505
PINNING
D'R and D'B are the colour difference signals at the output of the multiplexer circuit; D'R = −1.9(R−Y) and
D'B = +1.5(B−Y), for an EBU bar of 75% the amplitudes are equal.
SYMBOL
PIN
DESCRIPTION
−(R−Y)
MCONTR
−(B−Y)
FH/2
Y
TEST
R
V_DDA
G
V_SSA
B
Y/Y+SYNC
LPFDR
FADJ
LPFDB
FLT
V_ref
CHROMA
V_ext
SAND
CVBS
NOTCH
Y+SYNC IN
LPF4.4
Y+SYNC OUT
XTAL/PLL
VIDENT
VCO4.25
COLKIL
CS
1 colour difference input signal, for EBU bar of 75% 1.05 V (peak-to-peak value)
2 multiplexer control; input HIGH = RGB, input LOW = −(R−Y), −(B−Y) and Y
3 colour difference input signal, for EBU bar of 75% 1.33 V (peak-to-peak value)
4 line pulse input divided-by-2 for synchronizing two or more encoders; when not used this
pin is connected to ground
5 luminance input signal 1 V nominal without sync
6 test pin; must be connected to V_CC (pin 8), or left open-circuit
7 RED input signal for EBU bar of 75% 0.7 V (peak-to-peak value)
8 analog supply voltage for encoder part; 5 V nominal
9 GREEN input signal for EBU bar of 75% 0.7 V (peak-to-peak value)
10 analog ground
11 BLUE input signal for EBU bar of 75% 0.7 V (peak-to-peak value)
12 when this control input is LOW, Y without sync is connected to pin 5, input blanking at
pin 5 is active; when input is HIGH, Y+SYNC is connected to pin 5, input blanking at pin 5
is not active
13 modulator control loop filter output; black level of D'R = 4.40625 MHz
14 adjustment pin for 4.286 MHz of HF pre-emphasis filter
15 modulator control loop filter output; black level of D'B = 4.250 MHz
16 filter tuning loop capacitor output
17 2.5 V internal reference voltage output
18 chrominance output, amplitude corresponds with Y+SYNC at the output of the delay line
19 external power supply for sandcastle generation; when not used this pin is connected to
ground
20 3-level sandcastle output pulse
21 composite SECAM output 2 V (peak-to-peak value) nominal
22 Y+SYNC output after an internal resistor of 2 kΩ; a notch filter can be connected
23 Y+SYNC input, connected to the output of the delay line
24 loop filter output for 4.40625 MHz reference oscillator
25 Y+SYNC output, 2 V (peak-to-peak value) nominal, connected to the input of the
delay line
26 control pin; input HIGH = crystal tuning, input LOW = PLL tuning, both without vertical
identification, 2.5 V = PLL tuning with vertical identification
27 when used for PLL tuning a capacitor is connected; when used for crystal tuning a crystal
has to be connected (in series with a capacitor)
28 colour killing; input HIGH = active, internal colour difference signals are blanked
29 composite sync input, 0.3 V (peak-to-peak value) nominal
July 1994
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