TDA4672 Datasheet, PDF (2/16 Pages) NXP Semiconductors – Picture Signal Improvement PSI circuit with enhanced peaking function

Philips Semiconductors
Picture Signal Improvement (PSI) circuit
with enhanced peaking function
Product specification
TDA4672
FEATURES
• Luminance signal delay from 20 ns to 1100 ns
(minimum step 45 ns)
• Selectable luminance signal peaking with symmetrical
overshoots
• Selectable 2.6 or 5 MHz peaking centre frequency and
degree of peaking from −6 dB to +9 dB in 16 steps of
1 dB each
• Selectable noise reduction by coring
• Selectable 5 or 12 V sandcastle input voltage
• All controls selected via the I²C-bus
• Timing pulse generation for clamping and delay time
control synchronized by sandcastle pulse
• Automatic luminance signal delay correction using a
control loop
• Luminance input signal clamping with coupling capacitor
• 4.5 to +8.8 V supply voltage
• Minimum of external components.
GENERAL DESCRIPTION
The TDA4672 delays the luminance signal. The luminance
signal can also be improved by peaking and noise
reduction (coring).
QUICK REFERENCE DATA
SYMBOL
V_P
I_P(tot)
t_d(Y)
V_i(Y)(p-p)
G_Y
T_amb
PARAMETER
supply voltage (pin 1)
total supply current
Y signal delay time
composite Y input signal (peak-to-peak value, pin 16)
voltage gain of Y channel
operating ambient temperature
MIN.
4.5
26
20
−
−
0
TYP.
5
37
−
450
−1
−
MAX.
8.8
46
1 130
640
−
70
UNIT
V
mA
ns
mV
dB
°C
ORDERING INFORMATION
TYPE
NUMBER
TDA4672
NAME
DIP18
PACKAGE
DESCRIPTION
plastic dual in-line package; 18 leads (300 mil)
VERSION
SOT102-1
1996 Dec 11
2