ILA4661
1
B
ASEBAND DELAY LINE
GENERAL DESCRIPTION
The ILA4661 is an integrated baseband delay line circuit with one line delay. It is
suitable for decoders with colour-difference signal outputs
(R-Y) and (B-Y).
Device is functionally identical to the TDA4661 Philips.
FEATURES
Two comb filters, using the switched-capacitor technique, for one line delay time (64
S)
3 MHz internal clock signal derived from a 6 MHz CCO, line-locked by the sandcastle
pulse (64
S line)
Comb filtering functions for NTSC colour-difference signals to suppress cross-colour
Clamping of AC-coupled input signals (R-Y) and (B-Y)
QUICK REFERENCE DATA
Type U
VCC
=5.0 V
Parameter Symbol
Min. Type Max
Analogy supply current, mA
Ip1
-
-
6.0
Digital supply current, mA
Ip2
-
-
1.0
Input fixing voltage (on pins 14 and 16), V
U
14
,
16
1.3 - 1.7
Output voltage (on pins 11 and 12), V
U
11
,
12
2.5 - 3.3
Output signal (peak-to peak value)
(R-Y) on pin 11
(B-Y) on pin 12
U
011
U
012
-
-
1.05
1.33
-
-
Ratio of output amplitudes at equal input signals
(U
14
=U
16
=1.33V), dB
U
11
/U
12
-0.4
-
0.4
Ratio of output signals on pins 11 and 12 for
adjacent time samples at constant input signals
(U
14
=U
16
=1.33V), dB
U
n
/U
n+1
-0.1
-
0.1
Gain for PAL and NTSC
Gain for SECAM
(ratio U
O
/U
I
), dB
Gv
5.3
-0.6
-
-
6.3
0.4
Delay of delayed signals,
S
t
d
63.94
-
64.06
Delay of non-delayed signals, nS
t
dn
40
-
80
Transient time of delayed signal on pins 11
respectively 12, nS
t
tr
-
350
-
Transient time of non-delayed signal on pins 11
respectively 12, nS
t
trn
-
320
-
Noise voltage (RMS value; pins 11 and 12), mV
Un
-
-
1.2
Weighted signal-to-noise ratio, dB
S/N(w)
-
54
-