TDA8395 Datasheet, PDF (6/10 Pages) NXP Semiconductors – SECAM decoder

Philips Semiconductors
SECAM decoder
Preliminary specification
TDA8395
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP. MAX. UNIT
Sandcastle pulse
V_bl
blanking detection level
V_bg
burst gate detection level
t_f
falling edge of burst gate to
start sync
1.0
1.25
1.5
V
3.5
3.85
4.2
V
8.5
9.0
9.5
µs
Reference/communication
f_ref
V_ref(p-p)
reference frequency
reference voltage amplitude
(peak-to-peak value)
V_ed
SECAM enable detection
level; pin 1
V_dd
SECAM disabled detection
level; pin 1
I_s
sink current at SECAM
identification; pin 1
note 7
note 8
note 9
−
4.4336 −
MHz
0.20
−
0.50
V
−
2.8
3.3
V
1.5
2.0
−
V
−
150
−
µA
Identification
t_i
H
identification time
colour on/off hysteresis
−
4
−
frames
3
−
−
dB
Notes to the characteristics
1. If measured in the burst-period of a blue line.
2. The video input is AC-coupled.
3. During scan.
4. Measured as 100% x (IV_uI - IV_II) / (IV_uI + IV_lI); see Fig.3.
5. Converted to input frequency error.
6. Defined as the ratio between the peak-to-peak value of the B−Y component of the demodulated 100/75 colour bar
and the peak-to-peak value of the noise.
7. The reference should be stable during frame blanking.
8. The SECAM enable and disable timing should preferably be at the end of the frame blanking.
9. The externally supplied voltage should exceed 0.5 V.
October 1991
6