TDA4670 데이터 시트보기 (PDF) - Philips Electronics
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TDA4670 Datasheet PDF : 16 Pages
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Philips Semiconductors
Picture Signal Improvement (PSI) circuit
Product specification
TDA4670
SYMBOL
PARAMETER
CONDITIONS
MIN.
∆ td(Y)
minimum delay step
set via I2C-bus
40
group delay time difference
f = 0.5 to 5 MHz;
−
maximum delay
delay time difference between Y Y delay; CTI and peaking off 70
and colour-difference signals
td(peak)(min) minimum delay time for peaking
185
GY
VBS signal gain measured on
Vo/Vi; f = 500 kHz;
−2
output pin 12 (composite signal, maximum delay
peak-to-peak value)
I12
output current (emitter-follower source current
−1
with constant current source)
sink current
0.4
R12
output resistance
−
fres
frequency response for
maximum delay
f = 0.5 to 3 MHz
−2
f = 0.5 to 5 MHz
−4
LIN
signal linearity for
αmin/αmax;
video contents of 315 mV (p-p) VVBS = 450 mV (p-p)
0.85
video contents of 450 mV (p-p) VVBS = 640 mV (p-p)
0.60
Luminance peaking, selected via I2C-bus
fpeak
peaking frequency
fC1; LCF-bit = 0
4.5
fC2; LCF-bit = 1
2.3
Vpeak
peaking amplitude for grade of
peaking (fC amplitude/0.5 MHz
amplitude)
selectable values
−
−
−
−
limitation of peaking (positive
−
amplitude of correction signal
referenced to 315 mV)
Vn(rms)
noise voltage on pin 12
without peaking;
−
(RMS value)
f = 0 to 5 MHz
COR
coring of peaking (coring part
COR-bit = 1
−
referenced to 315 mV)
TYP.
45
0
100
215
−1
−
−
−
−1
−3
−
−
5
2.6
−3
0
+3
+6
20
−
20
MAX.
50
±25
UNIT
ns
ns
130
ns
245
ns
0
dB
−
mA
−
mA
160
Ω
0
dB
−1
dB
−
−
−
−
5.5
MHz
2.9
MHz
−
dB
−
dB
−
dB
−
dB
−
%
1
mV
−
%
1996 Dec 11
7
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