TDA4657 Datasheet, PDF (8/17 Pages) NXP Semiconductors – Generic multi-standard decoder

Philips Semiconductors
Generic multi-standard decoder
Preliminary specification
TDA4657
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP.
SECAM
V₁
colour difference output signals
independent of supply voltage; note 4
−(R−Y) output (peak-to-peak value)
0.95
1.05
V₃
−(B−Y) output (peak-to-peak value)
1.20
1.33
V₁/V₃
ratio of CD signal amplitudes
V(R−Y)/V(B−Y)
0.75
0.79
m
signal linearity at nominal output voltage
0.8
−
f_g
cut-off frequency
−3 dB
t_d
chrominance delay time
S/N
signal to noise ratio for 100 mV (p-p) input note 3
signal and nominal output voltages
−
730
400
500
40
−
V₁, V₃
residual carrier at CD outputs:
1 × subcarrier frequency
(peak-to-peak value)
−
−
2 × subcarrier frequency
(peak-to-peak value)
−
−
∆V₃
shift of demodulated f₀ level relative to
note 8
blanking level −(B−Y) output
−
0
∆V₁
−(R−Y) output
−
0
Impedance and currents see PAL or NTSC specification
Capacitor for SECAM de-emphasis (pin 2)
C₂
R_A
R_B
∆(R_A/R_B)
value of external capacitor
value of internal de-emphasis resistors
T_amb = 35 °C
relative tolerance of de-emphasis resistors
−
220
2.4
2.8
4.8
5.6
−
−
Capacitors for SECAM demodulator control (pins 4 and 8; note 5)
∆V_{1, 3}
shift of demodulated f₀ level due to
C_ext = 220 nF
−
−
external leakage current
Resistor for SECAM oscillator (pin 6)
V₆
DC voltage
R₆
value of external resistor (±1%)
C₆
value of external capacitor (±20%)
2.4
2.81
−
5.62
−
10
Chrominance input (pin 9)
V₉
input signal (peak-to-peak value)
R₉
input resistance
C₉
input capacitance
note 6
20
200
16
20
−
−
Capacitor for ACC (pin 10; note 7)
∆V_{1, 3}
change of CD output signals during field C_ext = 100 nF
−
0.2
blanking due to external leakage current
MAX.
1.15
1.46
0.83
−
−
600
−
10
20
±13
±10
−
3.2
6.4
±5
0.3
3.2
−
−
400
24
10
−
UNIT
V
V
−
−
kHz
ns
dB
mV
mV
mV
mV
pF
kΩ
kΩ
%
mV/nA
V
kΩ
nF
mV
kΩ
pF
%/nA
June 1993
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