TDA4670 Datasheet, PDF (8/16 Pages) NXP Semiconductors – Picture Signal Improvement PSI circuit

Philips Semiconductors
Picture Signal Improvement (PSI) circuit
Product specification
TDA4670
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
Colour-difference paths measured with transient times t_r = t_f = 1 µs; t_{p H} ≥ 1 µs; V_i = 1.33 V (p-p) on
pins 3 and 7 and with burst key pulse t_BK = 4 µs
V_i(CD)(p-p)
±(R − Y) input signal
(peak-to-peak value; pin 3)
75% colour bar
−
1.05 1.48
V_3,7
I_3,7
C_3,7
V_4,6
∆V_4,6
V_spike
±(B − Y) input signal
(peak-to-peak value; pin 7)
75% colour bar
−
1.33
input transient sensitivity
V_3,7/δt
0.15 −
internal clamping voltage level
−
2.45
input current
outside clamping
−
−
during clamping
±100 −
input capacitance
−
6
DC output voltage
−
2
output offset voltage
R_S ≤ 300 Ω; note 1
−
−
during and after storage time −
−
spurious spike signals on pins 4 R_S ≤ 300 Ω; note 1
and 6
−
−
1.88
−
−
±1
±190
12
−
±5
±18
±30
I_4,6
output current (emitter-follower source current
with constant current source)
sink current
−1
−
−
0.4
−
−
R_4,6
output resistance
−
−
100
G_v
signal gain in each path
V_o/V_i
−1
0
+1
∆G_v
gain difference −(R − Y)/−(B − Y)
−
0
±0.3
LIN
signal linearity for
α_min/α_max;
nominal signal
V_i = 1.33 V (p-p)
0.90 −
−
+3 dB signal
V_i = 1.88 V (p-p)
0.65 −
−
∆V_o
signal reduction at higher
signal with t_{p H} = 50 ns;
−1.5 −
−
frequency (output signal ratio
t_r = t_f = 1 µs
V_i/V_o)
Sandcastle pulse, input voltage selectable via I²C-bus
V₁₇
input voltage threshold for
SC5-bit = 0 (+12 V)
H and V sync
1.1
1.5
1.9
input voltage threshold for burst SC5-bit = 0 (+12 V)
5.5
6.5
7.5
input voltage threshold for
H and V sync
SC5-bit = 1 (+5 V)
1.1
1.5
1.9
input voltage threshold for burst SC5-bit = 1 (+5 V)
3.0
3.5
4.0
R₁₇
input resistance
+12 V input level
+5 V input level
30
40
50
15
20
25
C₁₇
input capacitance
t_BK
burst key pulse width
t_d
leading edge delay for clamping referenced to t_BK
pulse
−
4
8
3.0
4.0
4.6
−
1
−
n_p
number of required burst key
note 2
pulses vertical blanking interval
4
−
31
V
V
V/µs
V
µA
µA
pF
V
mV
mV
mV
mA
mA
Ω
dB
dB
−
−
dB
V
V
V
V
kΩ
kΩ
pF
µs
µs
−
1996 Dec 11
8