TDA4672 Datasheet, PDF (7/16 Pages) NXP Semiconductors – Picture Signal Improvement PSI circuit with enhanced peaking function

Philips Semiconductors
Picture Signal Improvement (PSI) circuit
with enhanced peaking function
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
t_d(peak)
G_Y
minimum delay time for peaking
VBS signal gain measured on
output pin 12 (composite signal,
peak-to-peak value)
V₁₂/V₁₆; f = 500 kHz;
maximum delay
I₁₂
output current (emitter-follower source current
with constant current source)
sink current
R₁₂
output resistance
f
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; note 1
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
Y delay = 215 ns;
peaking delay only
selectable values
from
to
each step
no limitation of peaking
V_n(rms)
noise voltage on pin 12
(RMS value)
without peaking;
f = 0 to 5 MHz
COR
coring of peaking
COR-bit = 1
(coring part referred to 315 mV)
Product specification
TDA4672
MIN.
40
−
TYP.
45
0
MAX.
50
±25
UNIT
ns
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
−
−6
−
dB
−
+9
−
dB
−
1
−
dB
−
−
−
%
−
−
1
mV
−
20
−
%
1996 Dec 11
7