December 1994
2
Philips Semiconductors
Product specification
Baseband delay line
TDA4661
FEATURES
Two comb filters, using the switched-capacitor
technique, for one line delay time (64
s)
Adjustment-free application
No crosstalk between SECAM colour carriers (diaphoty)
Handles negative or positive colour-difference input
signals
Clamping of AC-coupled input signals (
(R
-
Y) and
(B
-
Y))
VCO without external components
3 MHz internal clock signal derived from a 6 MHz CCO,
line-locked by the sandcastle pulse (64
s 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.
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).
QUICK REFERENCE DATA
ORDERING INFORMATION
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
V
P1
analog supply voltage (pin 9)
4.5
5
6
V
V
P2
digital supply voltage (pin 1)
4.5
5
6
V
I
P(tot)
total supply current
-
4.9
7.0
mA
V
I
(R
-
Y) input signal PAL/NTSC (peak-to-peak value; pin 16)
-
525
-
mV
(B
-
Y) input signal PAL/NTSC (peak-to-peak value; pin 14)
-
665
-
mV
(R
-
Y) input signal SECAM (peak-to-peak value; pin 16)
-
1.05
-
V
(B
-
Y) input signal SECAM (peak-to-peak value; pin 14)
-
1.33
-
V
G
v
gain V
O
/ V
I
of colour-difference output signals
V
11
/ V
16
for PAL and NTSC
5.3
5.8
6.3
dB
V
12
/ V
14
for PAL and NTSC
5.3
5.8
6.3
dB
V
11
/ V
16
for SECAM
-
0.6
-
0.1
+0.4
dB
V
12
/ V
14
for SECAM
-
0.6
-
0.1
+0.4
dB
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA4661
DIP16
plastic dual in-line package; 16 leads (300 mil) long body
SOT38-4
TDA4661T
SO16
plastic small outline package; 16 leads; body width 3.9 mm
SOT109-1
December 1994
3
Philips Semiconductors
Product specification
Baseband delay line
TDA4661
BLOCK DIAGRAM
TDA4661
+
+
14
16
11
12
SIGNAL
CLAMPING
SIGNAL
CLAMPING
LINE
MEMORY
SAMPLE-
AND-
HOLD
SAMPLE-
AND-
HOLD
LP
LP
output
buffers
addition
stages
pre-amplifiers
SANDCASTLE
DETECTOR
5
FREQUENCY
PHASE
DETECTOR
LP
6 MHz
CCO
DIVIDER
BY 192
DIVIDER
BY 2
10
3
3 MHz shifting clock
GND1
GND2
V
P1
V
P2
(RY)
(BY)
colour-difference
input signals
1
9
analog supply
digital supply
colour- difference
output signals
(RY)
(BY)
MEH182.2
sandcastle
pulse input
2
6
13
15
n.c.
n.c.
n.c.
n.c.
i.c.
LINE
MEMORY
4, 8
7
Fig.1 Block diagram.
December 1994
4
Philips Semiconductors
Product specification
Baseband delay line
TDA4661
PINNING
SYMBOL
PIN
DESCRIPTION
V
P2
1
+5 V supply voltage for digital part
n.c.
2
not connected
GND2
3
ground for digital part (0 V)
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
V
P1
9
+5 V supply voltage for analog part
GND1
10
ground for analog part (0 V)
V
O(R
-
Y)
11
(R
-
Y) output signal
V
O(B
-
Y)
12
(B
-
Y) output signal
n.c.
13
not connected
V
I(B
-
Y)
14
(B
-
Y) input signal
n.c.
15
not connected
V
I(R
-
Y)
16
(R
-
Y) input signal
2
3
4
5
6
7
8
1
9
10
11
12
13
14
15
16
V
V
V
P2
n.c.
GND2
i.c.
SAND
n.c.
i.c.
i.c.
P1
GND1
O(R
-
Y)
VO(B
-
Y)
n.c.
VI(B
-
Y)
n.c.
V
I(R
-
Y)
TDA4661
MEH183
Fig.2 Pin configuration.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134). Ground pins 3 and 10 connected together.
Note
1. Equivalent to discharging a 200 pF capacitor through a 0
series resistor.
THERMAL CHARACTERISTICS
SYMBOL
PARAMETER
MIN.
MAX.
UNIT
V
P1
supply voltage (pin 9)
-
0.5
+7
V
V
P2
supply voltage (pin 1)
-
0.5
+7
V
V
5
voltage on pin 5
-
0.5
V
P
+ 1.0
V
V
n
voltage on pins 11, 12, 14 and 16
-
0.5
V
P
V
T
stg
storage temperature
-
25
+150
C
T
amb
operating ambient temperature
0
70
C
V
ESD
electrostatic handling for all pins (note 1)
-
500
V
SYMBOL
PARAMETER
VALUE
UNIT
R
thj-a
thermal resistance from junction to ambient in free air
SOT38-4
75
K/W
SOT109-1
220
K/W
December 1994
5
Philips Semiconductors
Product specification
Baseband delay line
TDA4661
CHARACTERISTICS
V
P
= 5.0 V; input signals as specified in characteristics with 75% colour bars; super-sandcastle frequency of
15.625 kHz; T
amb
= +25
C; measurements taken in Fig.3 unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
P1
supply voltage (analog part; pin 9)
4.5
5
6
V
V
P2
supply voltage (digital part; pin 1)
4.5
5
6
V
I
P1
supply current
-
4.2
6.0
mA
I
P2
supply current
-
0.7
1.0
mA
Colour-difference input signals
V
I
input signal (peak-to-peak value)
(R
-
Y) PAL and NTSC (pin 16)
-
525
-
mV
(B
-
Y) PAL and NTSC (pin 14)
-
665
-
mV
(R
-
Y) SECAM (pin 16)
note 1
-
1.05
-
V
(B
-
Y) SECAM (pin 14)
note 1
-
1.33
-
V
V
I(max)
maximum symmetrical input signal
(peak-to-peak value)
(R
-
Y) or
(B
-
Y) for PAL and NTSC
before clipping
1
-
-
V
(R
-
Y) or
(B
-
Y) for SECAM
before clipping
2
-
-
V
R
14, 16
input resistance
-
-
40
k
C
14, 16
input capacitance
-
-
10
pF
V
14, 16
input clamping voltage
proportional to V
P
1.3
1.5
1.7
V
Colour-difference output signals
V
O
output signal (peak-to-peak value)
(R
-
Y) on pin 11
all standards
-
1.05
-
V
(B
-
Y) on pin 12
all standards
-
1.33
-
V
V
11
/V
12
ratio of output amplitudes at equal input
signals
V
I14, 16
= 1.33 V (p-p)
-
0.4
0
+0.4
dB
V
11, 12
DC output voltage
proportional to V
P
2.5
2.9
3.3
V
R
11, 12
output resistance
-
330
400
G
v
gain for PAL and NTSC
ratio V
O
/V
I
5.3
5.8
6.3
dB
gain for SECAM
ratio V
O
/V
I
-
0.6
-
0.1
+0.4
dB
V
n
/V
n+1
ratio of output signals on pins 11 and 12
for adjacent time samples at constant
input signals
V
I14, 16
= 1.33 V (p-p);
SECAM signals
-
0.1
0
+0.1
dB
V
n
noise voltage
(RMS value; pins 11 and 12)
V
I14, 16
= 0 V; note 2
-
-
1.2
mV
S/N(W)
weighted signal-to-noise ratio
V
O
= 1 V (p-p); note 2
-
54
-
dB
t
d
delay of delayed signals
63.94
64.0
64.06
s
delay of non-delayed signals
40
60
80
ns
t
tr
transient time of delayed signal on
pins 11 respectively 12
300 ns transient of
SECAM signal
-
350
-
ns
transient time of non-delayed signal on
pins 11 respectively 12
300 ns transient of
SECAM signal
-
320
-
ns
December 1994
6
Philips Semiconductors
Product specification
Baseband delay line
TDA4661
Notes
1. The signal must be blanked line-sequentially. The blanking level must be equal to the non-colour signal.
2. Noise voltage at f = 10 kHz to 1 MHz; V
I14, 16
= 0 (R
S
<
300
).
3. The leading edge of the burst-key pulse or H-blanking pulse is used for timing.
Sandcastle pulse input (pin 5)
f
BK
burst-key frequency
14.2
15.625
17.0
kHz
f
SAND
sandcastle frequency
14.2
15.625
17.0
kHz
V
5
top pulse voltage
note 3
4.0
-
V
P
+ 1.0 V
V
slice
internal slicing level
V
5
-
1.0
-
V
5
-
0.5 V
I
5
input current
-
-
10
A
C
5
input capacitance
-
-
10
pF
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
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