TDA8505 Datasheet, PDF (18/32 Pages) NXP Semiconductors – SECAM encoder

Philips Semiconductors
SECAM encoder
Preliminary specification
TDA8505
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
V_ext (pin 19)
I_ext
external supply current
−
−
1.5
mA
SAND output (pin 20; V_ext = 13.2 V); see Fig.8
I_sink(max)
I_source(max)
V_TL
maximum sink current
maximum source current
top voltage level
V_ext < 10 V
100
−
−
µA
100
−
−
µA
V_ext − 0. −
−
V
1
V_ext > 10 V
10
−
−
V
Notes
1. The threshold level of pin 2 is 700 ± 20 mV. The specification of the HIGH and LOW levels is in accordance with the
scart fast blanking.
2. The black level of input signal must be 2 V; amplitude 1 V (peak-to-peak value) nominal (Y = 700 mV,
SYNC = 300 mV).
3. The tolerances of f_OR and f_OB are with the printed-circuit board <±5 kHz. This value can be influenced by the print
layout.
4. The oscillator operates in series-resonance. The resonance resistance of the crystal must be <60 Ω and parallel
capacitance of the crystal <10 pF.
INTERNAL CIRCUITRY
PIN
1
NAME
−(R−Y)
CIRCUIT
DESCRIPTION
−(R−Y) input; connected via 47 nF
capacitor; 1.05 V (peak-to-peak
value) for EBU bar of 75%;
see also pins 3, 5, 7, 9 and 11
July 1994
18