Philips Semiconductors Product specification

Baseband delay line TDA4661

FEATURES GENERAL DESCRIPTION

• Two comb filters, using the switched-capacitor The TDA4661 is an integrated baseband delay line circuit
technique, for one line delay time (64 µs) with one line delay. It is suitable for decoders with
• Adjustment-free application colour-difference signal outputs ±(R−Y) and ±(B−Y).

• 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 µs 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.

QUICK REFERENCE DATA

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

VP1 analog supply voltage (pin 9) 4.5 5 6 V
VP2 digital supply voltage (pin 1) 4.5 5 6 V
IP(tot) total supply current − 4.9 7.0 mA
VI ±(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
Gv gain VO / VI of colour-difference output signals
V11 / V16 for PAL and NTSC 5.3 5.8 6.3 dB
V12 / V14 for PAL and NTSC 5.3 5.8 6.3 dB
V11 / V16 for SECAM −0.6 −0.1 +0.4 dB
V12 / V14 for SECAM −0.6 −0.1 +0.4 dB

ORDERING INFORMATION

TYPE PACKAGE
NUMBER 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

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BLOCK DIAGRAM
Philips Semiconductors

16 SIGNAL
±(R–Y)
Baseband delay line

CLAMPING 11
SAMPLE- ±(R–Y)
LINE
MEMORY AND- LP
HOLD
colour-difference
input signals pre-amplifiers
addition output colour- difference
stages buffers output signals

14 SIGNAL
±(B–Y)
CLAMPING 12
SAMPLE- ±(B–Y)
LINE
MEMORY AND- LP

3
HOLD
9
V analog supply 2 n.c.
P1
6 n.c.
3 MHz shifting clock TDA4661
13 n.c.
5 FREQUENCY
SANDCASTLE PHASE DIVIDER 15 n.c.
sandcastle DETECTOR DETECTOR BY 192
pulse input

LP 6 MHz DIVIDER 7 i.c.

CCO BY 2

10 digital supply 1 3 4, 8

GND1
VP2 GND2
MEH182.2

Fig.1 Block diagram.

TDA4661
Product specification
Philips Semiconductors Product specification

Baseband delay line TDA4661

PINNING

SYMBOL PIN DESCRIPTION

MEH183
VP2 1 +5 V supply voltage for digital part
n.c. 2 not connected V P2 1 16 V
I(R−Y)
GND2 3 ground for digital part (0 V)
n.c. 2 15 n.c.
i.c. 4 internally connected
SAND 5 sandcastle pulse input GND2 3 14 VI(B−Y)

n.c. 6 not connected

i.c. 4 13 n.c.
i.c. 7 internally connected TDA4661
SAND 5 12 VO(B−Y)
i.c. 8 internally connected
VP1 9 +5 V supply voltage for analog part n.c. 6 11 VO(R−Y)

GND1 10 ground for analog part (0 V)

i.c. 7 10 GND1
VO(R−Y) 11 ±(R−Y) output signal
VO(B−Y) 12 ±(B−Y) output signal i.c. 8 9 VP1

n.c. 13 not connected

VI(B−Y) 14 ±(B−Y) input signal
n.c. 15 not connected
Fig.2 Pin configuration.
VI(R−Y) 16 ±(R−Y) input signal

LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134). Ground pins 3 and 10 connected together.
SYMBOL PARAMETER MIN. MAX. UNIT
VP1 supply voltage (pin 9) −0.5 +7 V
VP2 supply voltage (pin 1) −0.5 +7 V
V5 voltage on pin 5 −0.5 VP + 1.0 V
Vn voltage on pins 11, 12, 14 and 16 −0.5 VP V
Tstg storage temperature −25 +150 °C
Tamb operating ambient temperature 0 70 °C
VESD electrostatic handling for all pins (note 1) − ±500 V

Note
1. Equivalent to discharging a 200 pF capacitor through a 0 Ω series resistor.

THERMAL CHARACTERISTICS

SYMBOL PARAMETER VALUE UNIT

Rthj-a thermal resistance from junction to ambient in free air
SOT38-4 75 K/W
SOT109-1 220 K/W

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Philips Semiconductors Product specification

Baseband delay line TDA4661

CHARACTERISTICS
VP = 5.0 V; input signals as specified in characteristics with 75% colour bars; super-sandcastle frequency of
15.625 kHz; Tamb = +25 °C; measurements taken in Fig.3 unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
VP1 supply voltage (analog part; pin 9) 4.5 5 6 V
VP2 supply voltage (digital part; pin 1) 4.5 5 6 V
IP1 supply current − 4.2 6.0 mA
IP2 supply current − 0.7 1.0 mA
Colour-difference input signals
VI 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
VI(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
R14, 16 input resistance − − 40 kΩ
C14, 16 input capacitance − − 10 pF
V14, 16 input clamping voltage proportional to VP 1.3 1.5 1.7 V
Colour-difference output signals
VO 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
V11/V12 ratio of output amplitudes at equal input VI14, 16 = 1.33 V (p-p) −0.4 0 +0.4 dB
signals
V11, 12 DC output voltage proportional to VP 2.5 2.9 3.3 V
R11, 12 output resistance − 330 400 Ω
Gv gain for PAL and NTSC ratio VO/VI 5.3 5.8 6.3 dB
gain for SECAM ratio VO/VI −0.6 −0.1 +0.4 dB
Vn/Vn+1 ratio of output signals on pins 11 and 12 VI14, 16 = 1.33 V (p-p); −0.1 0 +0.1 dB
for adjacent time samples at constant SECAM signals
input signals
Vn noise voltage VI14, 16 = 0 V; note 2 − − 1.2 mV
(RMS value; pins 11 and 12)
S/N(W) weighted signal-to-noise ratio VO = 1 V (p-p); note 2 − 54 − dB
td delay of delayed signals 63.94 64.0 64.06 µs
delay of non-delayed signals 40 60 80 ns
ttr transient time of delayed signal on 300 ns transient of − 350 − ns
pins 11 respectively 12 SECAM signal
transient time of non-delayed signal on 300 ns transient of − 320 − ns
pins 11 respectively 12 SECAM signal

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Philips Semiconductors Product specification

Baseband delay line TDA4661

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Sandcastle pulse input (pin 5)
fBK burst-key frequency 14.2 15.625 17.0 kHz
fSAND sandcastle frequency 14.2 15.625 17.0 kHz
V5 top pulse voltage note 3 4.0 − VP + 1.0 V
Vslice internal slicing level V5 − 1.0 − V5 − 0.5 V
I5 input current − − 10 µA
C5 input capacitance − − 10 pF
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; VI14, 16 = 0 (RS < 300 Ω).
3. The leading edge of the burst-key pulse or H-blanking pulse is used for timing.

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 470 Ω 680 Ω
VP = +12 V
10 µH Coil:

December 1994
Toko 119LN-A3753 GO

27
Philips Semiconductors

120 pF
27 pF pF
10 nF
330 330
Ω Ω 10 nF 10 nF 220 pF 220 pF
APPLICATION INFORMATION
Baseband delay line

12 13 11 10 9 8 7 5 6 4 2

TDA4661
0.33 µF colour-
16 difference ±(R–Y) comb filtering
signals
14 V i -(R-Y)
Vo -(R-Y)
10 nF 16 11
1 LINE DELAY
chrominance signal 15 1 nF
20 to 400 mV (p-p) 1 nF V o -(B-Y)
14 12
3 LINE DELAY
Y 220 pF Vi -(B-Y)
TDA4650

7
4
CVBS PAL/NTSC
SECAM ±(B–Y) comb filtering
8
S-VHS NTSC SSC
(Y, C) FILTERS (12 V) 7 i.c.
VCO 2 n.c.
PAL 28 6 n.c.
10 k Ω 13 n.c.
SECAM 27 5 LINE-LOCKED PLL / 15 n.c.
NTSC-3.58 26 24
PULSE PROCESSING
NTSC-4.43 25
colour standard 1N4148 +5.1 V +5.1 V
switching signals 23 22 17 21 19 20 18 10 9 1 3
(1) (1)
VP 8.8 7.2 47 nF
MHz MHz 820 Ω 270 100 nF
18 k Ω 100 nF
0.33 µF Ω
22 22 10 k Ω
6.8 k Ω X1 X2 10 Ω
nF nF PLL 3.3 k Ω
off +12 V
3.3 k Ω HUE 30 30 +12 V
HUE control 0.1 µF 10 Ω 560 Ω
pF pF
MEH184.3 off
22 µF 5.1 V

(1) positioned close to pins

Fig.3 Application circuit with TDA4650.

TDA4661
Product specification