20
TDA4665(Base Band Delay Line)
(1) Features
• Two comb filters, using the switched-capacitor technique,for one line delay time (64µs)
• Adjustment free application
• No crosstalk between SECAM colour carriers
• Handles negative or positive colour-difference input signals
• Clamping of AC-coupled input signals(±(R-Y)and±(B-Y))
• VCO without external components
• 3MHz internal clock signal derived from a 6MHz VCO, line-locked by the sandcastle pulse (64µs line)
• Sample-and -hold circuits and low-pass filters to suppress the 3 MHz clock signal
• Addition of delayed and non-delayed output signals
• Output buffer amplifiers
• Comb filtering functions for NTSC colour-difference signals to suppress cross-colour
(2) General Description
The TDA4661 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).
(3)Block Diagram
(4) Pin Description
SYMBOL PIN
DESCRIPTION
V
p2
1
+5V supply voltage for digital part
n.c.
2
not connected
GND2
3
ground for digital part (0V)
i.c.
4
internally connected
SAND
5
sandcastle pulse input
n.c.
6
not connected
i.c.
7
internally connected
i.c.
8
internally connected
SYMBOL PIN
DESCRIPTION
V
p1
9
+5V supply voltage for analog part
GND1
10
ground for analog part (0V)
V
0
(R-Y)
11
± (R-Y) output signal
V
0
(B-Y)
12
± (B-Y) output signal
n.c.
13
not connected
V
1
(B-Y)
14
± (B-Y) input signal
n.c.
15
not connected
V
1
(R-Y)
16
± (R-Y) input signal
