Philips TDA9181 Service Manual

INTEGRATED CIRCUITS

DATA SH EET

TDA9181

Integrated multistandard comb filter

Objective speciﬁcation File under Integrated Circuits, IC02

2000 Nov 22

Philips Semiconductors Objective speciﬁcation

Integrated multistandard comb ﬁlter TDA9181

FEATURES

• One-chip multistandard adaptive comb filter

• Cross luminance reduction

• Cross colour reduction

• No chroma trap, therefore sharper vertical luminance

transients

• Analog discrete-time signal processing, therefore no quantization noise

• Anti-aliasing and reconstruction filters are included

• Input switch selects between two Y/CVBS inputs

• Output switch selects between combed CVBS and an

external Y/C source

• fSC as well as 2 × fSC colour subcarrier signal may be applied

• Alignment free

• Few external components

• Low power.

QUICK REFERENCE DATA

GENERAL DESCRIPTION

The TDA9181is a an adaptive PAL/NTSC comb filter with two internal delay lines, filters, clock control and input clamps. Video standards PAL B, G, H, D, I, M and N and NTSC M are supported.

Two CVBS input signals can be selected by means of an input switch.

The selected CVBS input signal is filtered to obtain a combed luminance output signal and a combed chrominance output signal. Switched capacitor circuit techniques are used, requiring an internal clock, locked on to the colour subcarrier frequency.

Thecoloursubcarrierfrequencyaswellastwicethecolour subcarrier frequency may be applied to the IC.

In addition to the comb filter the circuit contains an output switch so that a selection can be made between the combed CVBS signal and an external Y/C signal.

The IC is available in a DIP16 and SO16 package. The supply voltage is 5 V.

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

CCA

DDD

i(Y/CVBS)(p-p)

i(CIN)(p-p)

i(FSC)(p-p)

o(Y/CVBS)(p-p)

o(CIN)(p-p)

analog supply voltage 4.5 5.0 5.5 V analog supply current − 25 − mA digital supply voltage 4.5 5.0 5.5 V digital supply current − 10 − mA luminance or CVBS input signal voltage (peak-to-peak value) 0.7 1.0 1.4 V chrominance input signal voltage (peak-to-peak value) − 0.7 1.0 V colour subcarrier input signal voltage (peak-to-peak value) 100 200 400 mV luminance or CVBS output signal voltage (peak-to-peak value) 0.6 1.0 1.54 V chrominance output signal voltage (peak-to-peak value) − 0.7 1.1 V

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

TDA9181P DIP16 plastic dual in-line package; 16 leads (300 mil); long body SOT38-4 TDA9181T SO16 plastic small outline package; 16 leads; body width 7.5 mm SOT162-1

2000 Nov 22 2

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2000 Nov 22 3

BLOCK DIAGRAM

Philips Semiconductors Objective speciﬁcation

Integrated multistandard comb ﬁlter TDA9181

handbook, full pagewidth

INPSEL

Y/CVBS

CLAMP

SANDCASTLE

DETECTOR

TDA9181

FILTER

TUNING

(LPFs)

LPF

FSC FSCSEL

2H/4H

DELAY

CLOCK GENERATOR

CCA

ADAPTIVE

4 × f

SYS110SYS2

DDD

COMB

FILTER

LPF

AGND4DGND

OUTSEL

Y/CVBS

OUT

MGT518

Fig.1 Block diagram.

Philips Semiconductors Objective speciﬁcation

Integrated multistandard comb ﬁlter TDA9181

PINNING

SYMBOL PIN DESCRIPTION

INPSEL 2 input switch select input Y/CVBS

DGND 4 digital ground V

DDD

CCA

SC 7 sandcastle signal input FSCSEL 8 colour subcarrier select input FSC 9 colour subcarrier input signal SYS2 10 standard select 2 input SYS1 11 standard select 1 input Y/CVBS

AGND 13 analog ground (signal reference) Y/CVBS

OUT

OUTSEL 15 output switch select input C

OUT

1 chrominance signal input

3 luminance or CVBS signal 2 input

5 digital supply voltage 6 analog supply voltage

12 luminance or CVBS signal 1 input

14 luminance or CVBS signal output

16 chrominance signal output

handbook, halfpage

INPSEL

Y/CVBS

DGND

DDD

CCA

FSCSEL

1 2 3 4

TDA9181P

5 6 7 8

MGT519

16 15 14 13 12 11 10

OUT OUTSEL Y/CVBS

AGND Y/CVBS

SYS1 SYS2 FSC

OUT

Fig.2 Pin configuration (DIP16).

2000 Nov 22 4

handbook, halfpage

Y/CVBS

INPSEL

DGND

DDD

CCA

FSCSEL

2 3

TDA9181T

5 6 7 8

MGT520

16 15 14 13 12 11 10

OUT OUTSEL Y/CVBS

AGND Y/CVBS

SYS1 SYS2 FSC

Fig.3 Pin configuration (SO16).

OUT

Philips Semiconductors Objective speciﬁcation

Integrated multistandard comb ﬁlter TDA9181

FUNCTIONAL DESCRIPTION Input conﬁguration

The Y/CVBS1and Y/CVBS2input signals are clamped by means of an internally generated clamp pulse which is derived from the sandcastle input signal (pin SC). If no sandcastlesignalisavailable,aclamppulsesignalmaybe applied to pin SC. External clamp capacitors are needed.

The buffered and clamped Y/CVBS1and Y/CVBS2signals arethenappliedtotheinputswitch.Theinputswitchselect signal (INPSEL) determines whether Y/CVBS1 or Y/CVBS2ispassedthroughtotheanti-aliaslow-passfilter. This 3rd-order low-pass filter is optimized for best performance with respect to step response and clock suppression. The filtered signal is sampled at a clock frequency of four times the colour subcarrier frequency (fSC).

A colour subcarrier frequency signal is applied to pin FSC. The colour subcarrier select input signal (FSCSEL) indicates whether the colour subcarrier frequency (fSC)or twice the colour subcarrier frequency (2 × fSC) is being applied at the FSC input. An external coupling capacitor is needed for the colour subcarrier input signal.

Comb ﬁlter

The sampled CVBS signal is applied to two delay lines. Depending on the applied standard, one delay line delays the signal over 1 or 2H for NTSC and PAL respectively (1H = oneline-time).ThestandardselectinputsSYS1and SYS2 indicate which standard, PAL B, G, H, D, I, M, N or NTSC M, is being applied.

Output conﬁguration

The luminance output switch selects between the reconstructed combed luminance signal and one of the bufferedandclampedinputsignals,Y/CVBS1orY/CVBS2. The chrominance output switch selects between the reconstructed combed chrominance signal and the chrominance input signal (CIN). An external coupling capacitor is needed for CIN. The selected signals are applied to the outputs Y/CVBS

OUT

and C

respectively

OUT

via a buffer stage. The output switch signal (OUTSEL) determines whether the output switches selectthe internal combed signals or the external Y/C signals.

Clock generation and ﬁlter tuning

The clock generator is driven by a Phase-Locked Loop (PLL)circuitwhichgeneratesareferencefrequencyoffour times the colour subcarrier frequency. This PLL circuit is phase-locked to the colour subcarrier input signal (FSC). Several internal clock signals are derived from the 4 × f

reference. The filter tuning ensures the automatic alignment of the

anti-alias and the reconstruction low-pass filters. A 4 × f

clock signal is used as a reference for the alignment. The tuning takes place each line during the line blanking and is initiated by means of an internally generated signal which is derived from the sandcastle input signal.

If the output switches select external Y/C signals the oscillator of the PLL circuit is stopped regardless of the FSCinputandnointernalclocksignalsaregenerated.The filter tuning is also stopped.

The direct and delayed signals are applied to an adaptive comb filter. The adaptive comb filter performs band-pass filtering around the colour subcarrier frequency and compares the contents of adjacent lines. In this way the combing of signals with different information is prevented and artifacts such as hanging dots are avoided.

Boththecombedchrominanceandthecombedluminance signalsare passed through a reconstruction low-pass filter to obtain continuous-time signals. These low-pass filters are3rd-order, optimized for best performance with respect to step response and clock suppression. The reconstructed signals are applied to the output switches.

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Philips Semiconductors Objective speciﬁcation

Integrated multistandard comb ﬁlter TDA9181

Mode deﬁnitions Table 1 General mode deﬁnitions; note 1

PIN OUTSEL MODE

LOW COMB HIGH YC

Note

1. If the OUTSEL pin is left open-circuit, the pin is pulled LOW by means of an internal pull-down resistor to analog ground (AGND). Thus the COMB mode can also be selected by not connecting the OUTSEL pin.

Table 2 Y/CVBS

MODE Y/CVBS

output signal deﬁnitions

OUT

OUTPUT SIGNAL

COMB comb ﬁltered luminance signal YC Y/CVBS

Table 3 C

output signal deﬁnitions

OUT

MODE C

or Y/CVBS2 signal

OUTPUT SIGNAL

OUT

COMB comb ﬁltered chrominance

signal

YC C

signal

Table 4 Input switch mode deﬁnitions; note 1

PIN INPSEL INPUT SWITCH MODE

LOW Y/CVBS HIGH Y/CVBS

input selected

Table 5 FSC mode deﬁnitions; note 1

PIN FSCSEL FSC INPUT SIGNAL FREQUENCY

LOW f HIGH 2 × f

Note

1. If the FSCSEL pin is left open-circuit, the pin is pulled LOW by means of an internal pull-down resistor to analog ground (AGND). Thus the f

mode can also

be selected by not connecting the FSCSEL pin.

Table 6 Video standard mode deﬁnitions; note 1

PIN SYS1 PIN SYS2

VIDEO

STANDARD

LOW LOW PAL M LOW HIGH PAL B, G, H, D or I HIGH LOW NTSC M HIGH HIGH PAL N

Note

1. If the SYS1 and SYS2 pins are left open-circuit, the SYS1 pin is pulled HIGH by means of an internal pull-up resistor to analog supply (V

) and the SYS2

CCA

pin is pulled LOW by means of an internal pull-down resistor to analog ground (AGND). Thus the NTSC M videostandard can also be selected bynot connecting pins SYS1 and SYS2.

Note

1. If the INPSEL pin is left open-circuit, the pin is pulled LOW by means of an internal pull-down resistor to analog ground (AGND). Thus the Y/CVBS

input can

also be selected by not connecting the INPSEL pin.

2000 Nov 22 6

Philips Semiconductors Objective speciﬁcation

Integrated multistandard comb ﬁlter TDA9181

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 60134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

DDD

CCA

i(prot)(th)

stg

amb

sol

Notes

1. All pins are protected against ESD by means of internal clamping diodes.

2. Human Body Model (HBM): R = 1.5 kΩ; C = 100 pF.

3. Pin 5 (V

4. Machine Model (MM): R = 0 Ω; C = 200 pF.

5. Pin 5 (V

digital supply voltage − 5.5 V analog supply voltage − 5.5 V input voltage protection threshold −0.3 VDD+ 0.3 V storage temperature −25 +150 °C ambient temperature −25 +70 °C soldering temperature for 5 s − 260 °C junction temperature − 150 °C electrostatic handling voltage HBM; all pins, except

−3000 +3000 V

pins 5 and 6; notes 1, 2 and 3 MM; all pins, except

−300 +300 V

pins 5 and 6; notes 1, 4 and 5

) and pin 6 (V

DDD

) and pin 6 (V

DDD

): HBM: −1500V<Ves< +1500 V.

CCA

): MM: −150V<Ves< +150 V.

CCA

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS VALUE UNIT

th(j-a)

thermal resistance from junction to ambient in free air

TDA9181P 75 K/W TDA9181T 95 K/W

QUALITY SPECIFICATION

In accordance with

“SNW-FQ-611E”

Latch-up

At an ambient temperature of 70 °C all pins meet the following specification:

• I

≥ 100 mA or ≥ 1.5 V

trigger

≤−100 mA or ≤−0.5 V

trigger

DD(max)

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Philips Semiconductors Objective speciﬁcation

Integrated multistandard comb ﬁlter TDA9181

CHARACTERISTICS

CCA=VDDD

= 0.7 V (p-p); input signal FSC = 200 mV (p-p) sine wave at fSC; input signal SC=5V (p-p) sandcastle signal; test

signal: 100/0/75/0 EBU colour bar for PAL B, G, H, D,I and N, 100% white 75% amplitude FCC colour bar for NTSC M and PAL M; source impedance for Y/CVBS FSC = 75 Ω, coupled with 100 nF; load impedance for CVBS/Y voltages are related to analog ground (pin AGND); unless otherwise speciﬁed.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supplies

CCA

DDD

P power dissipation − 175 − mW

Luminance or CVBS input 1 and input 2; pins Y/CVBS

i(Y/CVBS)(p-p)

clamp(Y/CVBS)

i(Y/CVBS)

Chrominance input; pin C

i(CIN)(p-p)

i(CIN)

Colour subcarrier input; pin FSC

i(FSC)(p-p)

D duty cycle square wave 40 50 60 % R

i(FSC)

Sandcastle input; pin SC

i(SC)

W(rep)

i(SC)

Input switch select input; pin INPSEL

i(INPSEL)

=5V; T

=25°C; input signal Y/CVBS1= 1 V (p-p); input signal Y/CVBS2= 1 V (p-p); input signal

amb

and Y/CVBS2=75Ω, coupled with 10 nF; source impedance for CIN and

OUT

and C

= 15 pF to analog ground (pin AGND); all

OUT

analog supply voltage 4.5 5.0 5.5 V analog supply current − 25 − mA digital supply voltage 4.5 5.0 5.5 V digital supply current − 10 − mA

and Y/CVBS

luminance or CVBS input

including sync 0.7 1.0 1.4 V

voltage (peak-to-peak value) clamp time constant − 20 − lines input current during clamping −10 0 +10 µA

during active video −10 0 +10 nA

chrominance input voltage

− 0.7 1.0 V

(peak-to-peak value) input resistance 30 −−kΩ

subcarrier input voltage

100 200 400 mV

(peak-to-peak value)

input resistance 30 −−kΩ

sandcastle input voltage no clamping −−3.3 V

clamping 3.7 −−V pulse width clamping; note 1 2.6 −−µs pulse rising edge position with respect to end of

−−− 2.6 µs

line-blanking; note 1 input resistance 1 −−MΩ input capacitance −−2pF

LOW-level input voltage Y/CVBS1 selected −−0.5 V HIGH-level input voltage Y/CVBS2 selected 2.0 −−V input resistance 100 −−kΩ input capacitance −−2pF

2000 Nov 22 8

Philips Semiconductors Objective speciﬁcation

Integrated multistandard comb ﬁlter TDA9181

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Output switch select input; pin OUTSEL

i(OUTSEL)

Colour subcarrier select input; pin FSCSEL

i(FSCSEL)

Standard select inputs 1 and 2; pins SYS1 and SYS2

i(SYS)

Luminance output; pin Y/CVBS

o(Y/CVBSOUT)(p-p)

G(Y)

−3dB(Y)

d(proc)(Y)

clamp

S/N luminance signal-to-noise

CLK(res)(Y)

LOW-level input voltage COMB mode −−0.5 V HIGH-level input voltage YC mode 2.0 −−V input resistance 100 −−kΩ input capacitance −−2pF

LOW-level input voltage fSC at FSC input; note 2 −−0.5 V HIGH-level input voltage 2 × fSC at FSC input 2.0 −−V input resistance 100 −−kΩ input capacitance −−2pF

LOW-level input voltage −−0.5 V HIGH-level input voltage 2.0 −−V input resistance 100 −−kΩ input capacitance −−2pF

OUT

luminance output signal

including sync 0.6 1.0 1.54 V (peak-to-peak value)

luminance gain error −1 0 +1 dB

−3 dB luminance bandwidth COMB mode;

6 −−MHz

PALB,G,H,DandI

COMB mode; NTSC M,

5 −−MHz

PAL M and N

YC mode 10 −−MHz luminance processing delay COMB mode; PAL B, G,

− 650 − ns

H, D and I; note 3

COMB mode; NTSC M,

− 800 − ns

PAL M and N; note 3

YC mode − 15 − ns voltage level during clamping − 1.5 − V black level error during blanking; note 4 −10 0 +10 mV

ratio (1 V/V

rms

noise)

crosstalk between different

unweighted;

200 kHz to 5 MHz

0 to 5 MHz −−−50 dB

56 −−dB

inputs residues of clock frequencies

in the luminance signal (V

/1 V)

rms

COMB mode; note 2

f=4×f f=2×f f = 1.33 × f f=f

SC SC

−−−30 dB

−−−40 dB

2000 Nov 22 9

Philips Semiconductors Objective speciﬁcation

Integrated multistandard comb ﬁlter TDA9181

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

FSC

SUP

res(YC)

comb(Y)

FSC residue in YC mode (V

/1 V)

rms

f=fSC; fSC at FSC input;

note 2

f=2×f

;2×fSCat FSC

−−−60 dB

input crosstalk suppression at

vertical transient black ↔ multi-burst [1 V/V (p-p)]

suppression (comb depth) with respect to luminance band-pass nearest to f

vertical transition active

video ↔ vertical blanking;

Figs 6 and 7; note 5

COMB mode;

PALB,G,H,DandI;

note 2 and Fig.8

f=f

283.75 74–

------------------------------ -

283.75 74+

-------------------------------

283.75

fSC×=

×=

26 −−dB

30 −−dB

− 10 − dB

COMB mode; PAL M;

note 2 and Fig.9

f=f

227.25 59–

------------------------------ -

227.25 59+

-------------------------------

227.25

×=

30 −−dB

− 10 − dB

COMB mode, PAL N;

see note 2 and Fig.10

f=f

229.25 59–

------------------------------ -

229.25 59+

-------------------------------

229.25

×=

30 −−dB

− 10 − dB

COMB mode, NTSC M;

see note 2 and Fig.11

f=f

227.5 59–

---------------------------

227.5

227.5 59+

--------------------------- -

227.5

×=

30 −−dB

− 10 − dB

output resistance −−500 Ω load impedance −−15 pF

2000 Nov 22 10

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