TDA4657 Datasheet, PDF (7/17 Pages) NXP Semiconductors – Generic multi-standard decoder

Philips Semiconductors
Generic multi-standard decoder
Preliminary specification
TDA4657
CHARACTERISTICS
Measured with application circuit (Fig.4) at T_amb = +25 °C, 8 V supply, 75% colour bar chrominance input signal of
200 mV (peak-to-peak value) and nominal phase for NTSC unless otherwise specified. All voltages measured
referenced to ground.
SYMBOL
PARAMETER
V_P
supply voltage
I
supply current
P_tot
total power dissipation
CONDITIONS
V_P = 8.0 V without
load
V_P = 8.0 V without
load
MIN.
7.2
25
−
TYP.
8.0
31
MAX.
8.8
37
UNIT
V
mA
248
296
mW
CD signals outputs (pins 1 and 3)
PAL or NTSC
V₁
colour difference output signals
independent of supply voltage; note 1
−(R−Y) output PAL and NTSC 4.43 MHz
442
525
624
(peak-to-peak value)
V₃
−(B−Y) output PAL and NTSC 4.43 MHz
(peak-to-peak value)
559
665
791
V₁/V₃
ratio of CD signal amplitudes
V(R−Y)/V(B−Y)
note 2
0.75
0.79 0.83
m
signal linearity −(R−Y) output
V₁ = 0.8 V (p-p)
0.8
−
−
signal linearity −(B−Y) output
V₃ = 1.0 V (p-p)
0.8
−
−
f_g
cut-off frequency (both outputs)
−3 dB
−
1
−
t_d
chrominance delay time
220
270
320
S/N
signal to noise ratio for nominal output
note 3
voltages
40
−
−
V₁, V₃
residual carrier at CD outputs
1 × subcarrier frequency
(peak-to-peak value)
−
−
10
2 × subcarrier frequency
(peak-to-peak value)
−
−
30
H/2 content at R−Y output at nominal input
signal (peak-to-peak value)
−
−
10
A
R₁, R₃
I₁, I₃
crosstalk between CD Channels
output resistance (npn emitter follower)
output current
−40
−
−
−
−
200
−
−
−3
mV
mV
−
−
−
MHz
ns
dB
mV
mV
mV
dB
Ω
mA
June 1993
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