TDA4672 Datasheet, PDF (8/16 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
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP.
Sandcastle pulse, input voltage selectable via I²C-bus
V₁₇
input voltage threshold for
SC5-bit = 0 (+12 V)
H and V sync
input voltage threshold for burst SC5-bit = 0 (+12 V)
input voltage threshold for
H and V sync
SC5-bit = 1 (+5 V)
input voltage threshold for burst SC5-bit = 1 (+5 V)
R₁₇
input resistance
+12 V input level
+5 V input level
C₁₇
input capacitance
t_BK
burst key pulse width
t_d
leading edge delay for clamping referenced to t_BK
pulse
n_p
number of required burst key
note 2
pulses vertical blanking interval
1.1
1.5
5.5
6.5
1.1
1.5
3.0
3.5
30
40
15
20
−
4
3.0
4.0
−
1
4
−
I²C-bus control, SDA and SCL
V_IH
HIGH level input voltage on
pins 9 and 10
V_IL
LOW level input voltage on pins 9
and 10
I_9,10
V_o(ACK)
input current on pins 9 and 10
output voltage at acknowledge on I_o(ACK) = 3 mA
pin 9
I_o(ACK)
output current at acknowledge on sink current
pin 9
3
−
0
−
−
−
−
−
3
−
Notes
1. α_min: minimum differential voltage gain of the luminance video signal;
α_max: maximum differential voltage gain of the luminance video signal.
2. A number of more than 31 burst key pulses repeats the counter cycle of delay time control.
MAX. UNIT
1.9
V
7.5
V
1.9
V
4.0
V
50
kΩ
25
kΩ
8
pF
4.6
µs
−
µs
31
−
5
V
1.5
V
±10
µA
0.4
V
−
mA
1996 Dec 11
8