TDA4671 Datasheet, PDF (7/16 Pages) NXP Semiconductors – Picture Signal Improvement PSI circuit

Philips Semiconductors
Picture Signal Improvement (PSI) circuit
Product specification
TDA4671
SYMBOL
PARAMETER
CONDITIONS
∆ t_d(Y)
minimum delay step
group delay time difference
set via I²C-bus
f = 0.5 to 5 MHz;
maximum delay
delay time difference between Y
and colour-difference signals
Y delay;
CTI and peaking off
t_d(peak)
G_Y
minimum delay time for peaking
VBS signal gain measured on
output pin 12 (composite signal,
peak-to-peak value)
V_o/V_i; f = 500 kHz;
maximum delay
I₁₂
output current (emitter-follower with source current
constant current source)
sink current
R₁₂
output resistance
f_res
frequency response for
maximum delay
f = 0.5 to 3 MHz
f = 0.5 to 5 MHz
LIN
signal linearity for
α_min/α_max;
video contents of 315 mV (p-p)
V_VBS = 450 mV (p-p)
video contents of 450 mV (p-p)
V_VBS = 640 mV (p-p)
Luminance peaking, selected via I²C-bus
f_peak
V_peak
peaking frequency
peaking amplitude for grade of
peaking (f_C amplitude over 0.5 MHz
amplitude)
f_C1; LCF-bit = 0
f_C2; LCF-bit = 1
selectable values
V_n(rms)
COR
limitation of peaking (positive
amplitude of correction signal
referred to 315 mV)
noise voltage on pin 12
(RMS value)
coring of peaking
(coring part referred to 315 mV)
without peaking;
f = 0 to 5 MHz
COR-bit = 1
MIN.
40
−
TYP.
45
0
MAX. UNIT
50
ns
±25 ns
70
100 130 ns
185 215 245 ns
−2
−1
0
dB
−1
−
0.4 −
−
−
−2
−1
−4
−3
0.85 −
0.60 −
−
mA
−
mA
160 Ω
0
dB
−1
dB
−
−
−
−
4.5 5
5.5 MHz
2.3 2.6 2.9 MHz
−
−3
−
dB
−
0
−
dB
−
+3
−
dB
−
+6
−
dB
−
20
−
%
−
−
1
mV
−
20
−
%
1996 Dec 11
7