TDA8505 datasheet(4/32 Pages) PHILIPS

4 / 32 page

July 1994

Philips Semiconductors

Preliminary speciﬁcation

SECAM encoder

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

DESCRIPTION

−(R−Y)

colour difference input signal, for EBU bar of 75% 1.05 V (peak-to-peak value)

MCONTR

multiplexer control; input HIGH = RGB, input LOW =

−(R−Y), −(B−Y) and Y

−(B−Y)

colour difference input signal, for EBU bar of 75% 1.33 V (peak-to-peak value)

FH/2

line pulse input divided-by-2 for synchronizing two or more encoders; when not used this

pin is connected to ground

luminance input signal 1 V nominal without sync

TEST

test pin; must be connected to VCC (pin 8), or left open-circuit

RED input signal for EBU bar of 75% 0.7 V (peak-to-peak value)

VDDA

analog supply voltage for encoder part; 5 V nominal

GREEN input signal for EBU bar of 75% 0.7 V (peak-to-peak value)

VSSA

analog ground

BLUE input signal for EBU bar of 75% 0.7 V (peak-to-peak value)

Y/Y+SYNC

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

LPFDR

modulator control loop ﬁlter output; black level of D'R = 4.40625 MHz

FADJ

adjustment pin for 4.286 MHz of HF pre-emphasis ﬁlter

LPFDB

modulator control loop ﬁlter output; black level of D'B = 4.250 MHz

FLT

ﬁlter tuning loop capacitor output

Vref

2.5 V internal reference voltage output

CHROMA

chrominance output, amplitude corresponds with Y+SYNC at the output of the delay line

Vext

external power supply for sandcastle generation; when not used this pin is connected to

ground

SAND

3-level sandcastle output pulse

CVBS

composite SECAM output 2 V (peak-to-peak value) nominal

NOTCH

Y+SYNC output after an internal resistor of 2 k

Ω; a notch ﬁlter can be connected

Y+SYNC IN

Y+SYNC input, connected to the output of the delay line

LPF4.4

loop ﬁlter output for 4.40625 MHz reference oscillator

Y+SYNC OUT

Y+SYNC output, 2 V (peak-to-peak value) nominal, connected to the input of the

delay line

XTAL/PLL

VIDENT

control pin; input HIGH = crystal tuning, input LOW = PLL tuning, both without vertical

identiﬁcation, 2.5 V = PLL tuning with vertical identiﬁcation

VCO4.25

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)

COLKIL

colour killing; input HIGH = active, internal colour difference signals are blanked

composite sync input, 0.3 V (peak-to-peak value) nominal

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