Philips TDA8374-N2, TDA8373N-N3, TDA8373C-N3, TDA8373C-N2, TDA8373-N3 Datasheet

...

DATA SH EET

Preliminary speciﬁcation File under Integrated Circuits, IC02

1997 Jul 01

INTEGRATED CIRCUITS

TDA837x family

C-bus controlled economy PAL/NTSC and NTSC TV-processors

1997 Jul 01 2

Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

FEATURES

Available in all ICs:

• Vision IF amplifier with high sensitivity and good figures for differential phase and gain

• PLL demodulator for the IF signal

• Alignment-free sound demodulator

• Flexible source selection with a CVBS input for the

internal signal and Y/C or CVBS input for the external signal

• Audio switch

• The output signal of the CVBS (Y/C) switch is externally

available

• Integrated chrominance trap and band-pass filters (auto-calibrated)

• Luminance delay line integrated

• A symmetrical peaking circuit in the luminance channel

• Black stretching of non-standard CVBS or luminance

signals

• RGB control circuit with black current stabilization and white point adjustment

• Linear RGB inputs and fast blanking

• Horizontal synchronization with two control loops and

alignment-free horizontal oscillator

• Slow start and slow stop of the horizontal drive pulses

• Vertical count-down circuit

• Vertical driver optimized for DC-coupled vertical output

stages

• I

C-bus control of various functions

• Low dissipation

• Small amount of peripheral components compared with

competition ICs.

GENERAL DESCRIPTION

The various versions of the TDA837x series are I

C-bus controlled single-chip TV processors which are intended to be applied in PAL/NTSC (TDA8374 and TDA8375) and NTSC (TDA8373 and TDA8377) television receivers. All ICs are available in an SDIP56 package and some versions are also available in a QFP64 package. The ICs are pin compatible so that with one application board NTSC and PAL/NTSC (or multistandard together with the SECAM decoder TDA8395) receivers can be built.

Functionally this IC series is split in to 2 categories:

• Versions intended to be used in economy TV receivers

with all basic functions

• Versions with additional functions such as E-W

geometry control, horizontal and vertical zoom function and YUV interface which are intended for TV receivers

with 110° picture tubes. The various type numbers are given in Table 1. The detailed differences between the various ICs are

given in Table 2.

Table 1 TV receiver versions

TV RECEIVERS

SDIP56 PACKAGE QFP64 PACKAGE

ECONOMY MID/HIGH END ECONOMY MID/HIGH END

PAL only TDA8374B − TDA8374BH − PAL/NTSC (SECAM) TDA8374 and TDA8374A TDA8375 and TDA8375A TDA8374AH TDA8375AH NTSC TDA8373 TDA8377 and TDA8377A −−

1997 Jul 01 3

Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

Table 2 Differences between the various ICs

QUICK REFERENCE DATA

CIRCUITS

IC VERSION (TDA)

8373 8374 8374A(H) 8374B(H) 8375 8375A(H) 8377 8377A

Multistandard IF − X −−XX −− Automatic Volume Levelling

(AVL)

XX − −−− −−

PAL decoder − X X XXX −− SECAM interface − X X XXX −− NTSC decoder X X X X X X X X Colour matrix PAL/NTSC (Japan) − X X XXX −− Colour matrix NTSC (USA/Japan) X − − −−−XX YUV interface −− − − XXXX Horizontal geometry −− − − XXXX Horizontal and vertical zoom −− − −XX XX

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supplies

supply voltage − 8.0 − V

supply current − 110 − mA

Input voltages

48,49(rms)

video IF ampliﬁers sensitivity (RMS value)

− 70 −µV

1(rms)

sound IF ampliﬁers sensitivity (RMS value)

− 1.0 − mV

2(rms)

external audio input voltage (RMS value)

− 500 − mV

11(p-p)

external CVBS/Y input voltage (peak-to-peak value)

− 1.0 − V

10(p-p)

external chrominance input voltage (burst amplitude) (peak-to-peak value)

− 0.3 − V

23-25(p-p)

RGB input voltage (peak-to-peak value)

− 0.7 − V

Output signals

6(p-p)

IF video output voltage (peak-to-peak value)

− 2.5 − V

tuner AGC output current range 0 − 5mA

oVSW

output signal level of video switch (peak-to-peak value)

− 1.0 − V

30(p-p)

−(R − Y) output voltage (peak-to-peak value)

− 525 − mV

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Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

ORDERING INFORMATION

29(p-p)

−(B − Y) output voltage (peak-to-peak value)

− 675 − mV

28(p-p)

luminance output voltage (peak-to-peak value)

− 1.4 − V

19-21(p-p)

RGB output signal amplitudes (peak-to-peak value)

− 2.0 − V

horizontal output current − 10 − mA

46,47(p-p)

vertical output current (peak-to-peak value)

− 1 − mA

45(peak)

E-W output current (peak value) TDA8375A,

TDA8377A, TDA8375 and TDA8377

− 1.2 − mA

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TDA837xA SDIP56 plastic shrink dual in-line package; 56 leads (600 mil) SOT400-1 TDA837xH QFP64 plastic quad ﬂat package; 64 leads (lead length 1.95 mm);

body 14 × 20 × 2.7 mm; high stand-off height

SOT319-1

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

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I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

BLOCK DIAGRAM

ok, full pagewidth

MGK286

RGB MATRIX

RGB INPUT

AND SWITCH

G - Y MATRIX

AND

SAT CONTROL

NTSC

DECODER

RGB CONTROL

AND

OUTPUT

DELAY

AND

PEAKING

BLACK

STRETCHER

VERTICAL

SYNC

SEPARATOR

TRAP

BLACK

CURRENT

STABILIZER

VERTICAL

GEOMETRY

HORIZONTAL/

VERTICAL

DIVIDER

SYNC

SEPARATOR

AND 1st LOOP

VCO

AND

CONTROL

2nd LOOP AND

HORIZONTAL

OUTPUT

CONTROL DACs

1 × 8 BITS

14 × 6 BITS

1 × 4 BITS

2331

322930

43 14

44 12 37

REF

8753

9 42 4154

3436336161110381713

3.6

MHz

white

point

BRI

TDA8373

SAT

REF

B−Y

R−Y

HUE

CONTR

24 25 26

FILTER

TUNING

BAND-PASS

55245

MUTE

VOL SW

CVBS Y/C

SWITCH

PRE-AMPLIFIER

AND MUTE

MUTE

IDENT

ADJ

tuner

take-over

point

+8 V

AFC

VIDEO

AMPLIFIER

AND MUTE

VIDEO

IDENTIFICATION

AGC FOR IF

AND TUNER

C-BUS

TRANSCEIVER

VIF AMPLIFIER

AND PLL

DEMODULATOR

VCO

ADJUSTMENT

CVBS

SWITCH

AVL AND

SWITCH AND

VOLUME CONTROL

AFC

PLL

DEMODULATOR

SOUND

TRAP

SOUND

BAND-PASS

LIMITER

Fig.1 Block diagram of bus-controlled economy NTSC TV-processor TDA8373.

The TDA8373 is only supplied in an SDIP package.

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I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

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MGK287

RGB MATRIX

RGB INPUT

AND SWITCH

G - Y MATRIX

AND

SAT CONTROL

PAL/NTSC

DECODER

RGB CONTROL

AND

OUTPUT

DELAY

AND

PEAKING

BLACK

STRETCHER

VERTICAL

SYNC

SEPARATOR

TRAP

BLACK

CURRENT

STABILIZER

VERTICAL

GEOMETRY

HORIZONTAL/

VERTICAL

DIVIDER

SYNC

SEPARATOR

AND 1st LOOP

VCO

AND

CONTROL

2nd LOOP AND

HORIZONTAL

OUTPUT

CONTROL DACs

1 × 8 BITS

14 × 6 BITS

1 × 4 BITS

31 322930

43 14

44 12 37

REF

9 42 41

(51)

36336161110381713

3.6

MHz

white

point

BRI

TDA8374

SAT

REF

B−Y

R−Y

HUE

CONTR

24 25 26

4.4

MHz

FILTER

TUNING

BAND-PASS

55245

MUTE

VOL SW

CVBS Y/C

SWITCH

PRE-AMPLIFIER

AND MUTE

MUTE

IDENT

ADJ

tuner

take-over

point

POL

+8 V

AFC

POL

VIDEO

AMPLIFIER

AND MUTE

VIDEO

IDENTIFICATION

AGC FOR IF

AND TUNER

C-BUS

TRANSCEIVER

VIF AMPLIFIER

AND PLL

DEMODULATOR

VCO

ADJUSTMENT

CVBS

SWITCH

AVL AND

SWITCH AND

VOLUME CONTROL

AFC

PLL

DEMODULATOR

SOUND

TRAP

TDA4665

SOUND

BAND-PASS

LIMITER

Fig.2 Block diagram of bus-controlled economy PAL/NTSC TV processor TDA8374.

For most pins the QFP64 pinning is not indicated.

1997 Jul 01 7

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I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

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MGK288

RGB MATRIX

RGB INPUT

AND SWITCH

G - Y MATRIX

AND

SAT CONTROL

PAL/NTSC

DECODER

RGB CONTROL

AND

OUTPUT

DELAY PLUS

PEAKING PLUS

CORING

BLACK

STRETCHER

VERTICAL

SYNC

SEPARATOR

TRAP

BLACK

CURRENT

STABILIZER

VERTICAL

GEOMETRY

HORIZONTAL/

VERTICAL

DIVIDER

SYNC

SEPARATOR

AND 1st LOOP

VCO

AND

CONTROL

2nd LOOP AND

HORIZONTAL

OUTPUT

CONTROL DACs

1 × 8 BITS

18 × 6 BITS

1 × 4 BITS

(35)

(47)

(40)

(39)

(48)

(45)

(46)

(59)

(25,26)

(60,61)

(22,23)

(53)

REF

(18)

(17)

(6)

(19)

(58)

(57)

(56)

(7)

(50)

(51)

(52)

(49)

(16)

(28)

(21)

(20)

(54)

(29)

(24)

(55)

3.6

MHz

(33) 21

(30) 18

(5) 52

(4) 51

(34) 22

(32) 20

(63) 46

(3) 50

E-W

GEOMETRY

(62) 45

(64) 47

(31) 19

white

point

BRI

TDA8375

SAT

REF

B−Y

R−Y

HUE

CONTR

(36)

(37)

(38)

4.4

MHz

FILTER

TUNING

BAND-PASS

56 (9)

1 (10)

55 (8)

2 (11)

15 (27)

49 (2)

5 (15)

MUTE

VOL SW

CVBS Y/C

SWITCH

PRE-AMPLIFIER

AND MUTE

MUTE

IDENT

ADJ

tuner

take-over

point

POL

+8 V

AFC

POL

VIDEO

AMPLIFIER

AND MUTE

VIDEO

IDENTIFICATION

AGC FOR IF

AND TUNER

C-BUS

TRANSCEIVER

48 (1)

4 (14)

3 (13)

VIF AMPLIFIER

AND PLL

DEMODULATOR

VCO

ADJUSTMENT

CVBS

SWITCH

SWITCH AND

VOLUME CONTROL

AFC

PLL

DEMODULATOR

SOUND

TRAP

TDA4665

SOUND

BAND-PASS

LIMITER

Fig.3 Block diagram of bus-controlled economy PAL/NTSC TV processor TDA8375.

1997 Jul 01 8

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I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

ull pagewidth

MGK289

RGB MATRIX

RGB INPUT

AND SWITCH

G - Y MATRIX

AND

SAT CONTROL

NTSC

DECODER

RGB CONTROL

AND

OUTPUT

DELAY PLUS

PEAKING PLUS

CORING

BLACK

STRETCHER

VERTICAL

SYNC

SEPARATOR

TRAP

BLACK

CURRENT

STABILIZER

VERTICAL

GEOMETRY

HORIZONTAL/

VERTICAL

DIVIDER

SYNC

SEPARATOR

AND 1st LOOP

VCO

AND

CONTROL

2nd LOOP AND

HORIZONTAL

OUTPUT

CONTROL DACs

1 × 8 BITS

18 × 6 BITS

1 × 4 BITS

28 27

322930

43 14

44 12 37

REF

9 42 41 40

3436336161110381713

3.6

MHz

E-W

GEOMETRY

white

point

BRI

TDA8377

SAT

REF

B−Y

R−Y

HUE

CONTR

24 25 26

FILTER

TUNING

BAND-PASS

55215

MUTE

VOL SW

CVBS Y/C

SWITCH

PRE-AMPLIFIER

AND MUTE

MUTE

IDENT

ADJ

tuner

take-over

point

+8 V

AFC

VIDEO

AMPLIFIER

AND MUTE

VIDEO

IDENTIFICATION

AGC FOR IF

AND TUNER

C-BUS

TRANSCEIVER

VIF AMPLIFIER

AND PLL

DEMODULATOR

VCO

ADJUSTMENT

CVBS

SWITCH

SWITCH AND

VOLUME CONTROL

AFC

PLL

DEMODULATOR

SOUND

TRAP

SOUND

BAND-PASS

LIMITER

Fig.4 Block diagram of bus-controlled economy NTSC TV processor TDA8377.

The TDA8377 is only supplied in an SDIP package.

1997 Jul 01 9

Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

PINNING

SYMBOL

DESCRIPTION

SDIP56 QFP64

SIF 1 10 sound IF input AUDI 2 11 external audio input VCO1 3 13 IF VCO 1 tuned circuit VCO2 4 14 IF VCO 2 tuned circuit PLL 5 15 PLL loop ﬁlter IFVO 6 16 IF video output SCL 7 17 serial clock input (I

C-bus)

SDA 8 18 serial data input/output (I

C-bus)

DEC

9 19 band gap decoupling CHROMA 10 20 chrominance input CVBS/Y 11 21 CVBS/Y input V

12 22 and 23 main supply voltage (+8 V)

CVBS

int

13 24 internal CVBS input GND1 14 25 and 26 ground AUDO 15 27 audio output DEC

16 28 decoupling ﬁlter tuning CVBS

ext

17 29 external CVBS input BLKIN 18 30 black current input BO 19 31 blue output GO 20 32 green output RO 21 33 red output BCLIN 22 34 beam current input RI 23 35 red input GI 24 36 green input BI 25 37 blue input RGBIN 26 38 RGB insertion input YIN 27

(2)

39 luminance input YOUT 28 40 luminance output BYO 29 45 (B −Y) output RYO 30 46 (R − Y) output RYI 31 47 (R − Y) input BYI 32 48 (B − Y) input SEC

ref

(1)

49 SECAM reference output XTAL1 34 50 3.58 MHz crystal connection XTAL2 35

(1)

51 4.43 MHz crystal connection LFBP 36 52 loop ﬁlter burst phase detector V

37 53 horizontal oscillator supply voltage (+8 V)

CVBSO 38 54 CVBS output

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I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

Notes

1. In the TDA8373 and TDA8377 pin 35 (4.43 MHz crystal) is internally connected and pin 33 is just a subcarrier output which can be used as a reference signal for comb filter ICs.

2. In the TDA8373 and TDA8374 the following pins are different (SDIP56): Pin 27: not connected; Pin 45: AVL capacitor.

BLPH 39 55 black peak hold capacitor HOUT 40 56 horizontal drive output FBI/SCO 41 57 ﬂyback input and sandcastle output PH2 42 58 phase 2 ﬁlter/protection PH1 43 59 phase 1 ﬁlter GND2 44 60 and 61 ground 2 EWD 45

(2)

62 east-west drive output VDOB 46 63 vertical drive output B VDOA 47 64 vertical drive output A IFIN1 48 1 IF input 1 IFIN2 49 2 IF input 2 EHT/PRO 50 3 EHT/overvoltage protection input VSAW 51 4 vertical sawtooth capacitor I

ref

52 5 reference current input

DEC

AGC

53 6 AGC decoupling capacitor AGCOUT 54 7 tuner AGC output AUDEEM 55 8 audio deemphasis DEC 56 9 decoupling sound demodulator i.c. − 12 internally connected i.c. − 41 internally connected i.c. − 42 internally connected i.c. − 43 internally connected i.c. − 44 internally connected

SYMBOL

DESCRIPTION

SDIP56 QFP64

1997 Jul 01 11

Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

Fig.5 Pin configuration (SDIP56).

handbook, halfpage

TDA837x

MGK284

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

52 51 50

54 53

49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29

27 28

SIF

AUDI VCO1 VCO2

PLL

IFVO

SCL SDA

DEC

CHROMA

CVBS/Y

CVBS

int

GND1

AUDO

DEC

CVBS

ext

BLKIN

BO GO RO

BCLIN

RI GI BI

RGBIN

YIN

YOUT

DEC AUDEEM AGCOUT DEC

AGC

ref

VSAW EHT/PRO IFIN2 IFIN1 VDOA VDOB EWD GND2 PH1 PH2 FBI/SCO HOUT BLPH CVBSO V

LFBP XTAL2 XTAL1 SEC

ref

BYI RYI RYO BYO

1997 Jul 01 12

Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

Fig.6 Pin configuration (QFP64).

handbook, full pagewidth

TDA837xH

MGK285

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34

BYI RYI RYO BYO i.c. i.c. i.c. i.c. YOUT YIN RGBIN BI GI RI BCLIN RO

IFIN1 IFIN2

EHT/PRO

VSAW

ref

DEC

AGC

AGCOUT AUDEEM

DEC

SIF

AUDI

i.c. VCO1 VCO2

PLL

IFVO 33

VDOA

VDOB

EWD

GND2

PH1

PH2

FBI/SCO

HOUT

BLPH

CVBSO

VP2LFBP

XTAL2

XTAL1

SEC

ref

SCL

SDA

DEC

CHROMA

CVBS/Y

VP1V

CVBS

int

GND1

AUDO

DEC

CVBS

ext

BLKIN

GO 49

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Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

FUNCTIONAL DESCRIPTION Vision IF ampliﬁer

The IF amplifier contains 3 AC-coupled control stages with a total gain control range which is higher than 66 dB. The sensitivity of the circuit is comparable with that of modern IF-ICs.

The video signal is demodulated by a PLL carrier regenerator. This circuit contains a frequency detector and a phase detector. During acquisition the frequency detector will tune the VCO to the correct frequency. The initial adjustment of the oscillator is realized via the I

C-bus.

The switching, between SECAM L and L’, can also be realized via the I2C-bus. After lock-in the phase detector controls the VCO so that a stable phase relationship between the VCO and the input signal is achieved. The VCO operates at twice the IF frequency. The reference signal for the demodulator is obtained by using a frequency divider circuit.

The AFC output is obtained by using the VCO control voltage of the PLL and can be read via the I2C-bus. For fast search tuning systems the window of the AFC can be increased by a factor of 3. The setting is realized with the AFW bit.

Depending on the device type the AGC detector operates on top-sync level (single standard versions) or on top-sync and top-white level (multistandard versions). The demodulation polarity is switched via the I2C-bus. The AGC detector time constant capacitor is connected externally. This is mainly because of the flexibility of the application. The time constant of the AGC system during positive modulation is rather long, this is to avoid visible variations of the signal amplitude. To improve the speed of the AGC system, a circuit has been included which detects whether the AGC detector is activated every frame period. When, during 3 frame periods, no action is detected the speed of the system is increased. For signals without peak-white information the system switches automatically

to a gated black level AGC. Because a black level clamp pulse is required for this method of operation the circuit will only switch to black level AGC in the internal mode.

The circuits contain a second fast video identification circuit which is independent of the synchronization identification circuit. Consequently, search tuning is also possible when the display section of the receiver is used as a monitor. However, this identification circuit cannot be made as sensitive as the slower sync identification circuit (SL) and it is recommended to use both identification outputs to obtain a reliable search system. The identification output is applied to the tuning system via the I

C-bus.

The input of the identification circuit is connected to pin 13, the internal CVBS input (see Fig.1). This has the advantage that the identification circuit can also be made operative when a scrambled signal is received [descrambler connected between the IF video output (pin 6) and pin 13]. A second advantage is that the identification circuit can be used when the IF amplifier is not used (e.g. with built-in satellite tuners).

The video identification circuit can also be used to identify the selected CBVS or Y/C signal. The switching between the two modes can be realized with bit VIM.

Video switches

The circuit has two CVBS inputs (CVBS

int

and CVBS

ext

) and a Y/C input. When the Y/C input is not required pin 11 can be used as the third CVBS input. The switch configuration is illustrated in Fig.7. The selection of the various sources is made via the I2C-bus.

The output signal of the CVBS switch is externally available and can be used to drive the teletext decoder, the SECAM add-on decoder and a comb filter. In applications with comb filters a Y/C input is only possible when additional switches are added. In applications without comb filters the Y/C input signal can be switched to the CVBS output.

1997 Jul 01 14

Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

Fig.7 Configuration CVBS switch and interfacing of video identification.

handbook, full pagewidth

MGK301

VIDEO

IDENTIFICATION

VIM

IDENT

TDA837x

CVBS

int

S0 S5

CVBS

ext

S1 S6 S2

CVBS/Y

S3 S7 S4

CHROMA CVBSO

10 38

to luminance/ sync processing

to chrominance processing

Sound circuit

The sound band-pass and trap filters have to be connected externally. The filtered intercarrier signal is fed to a limiter circuit and is demodulated by a PLL demodulator. This PLL circuit automatically tunes to the incoming carrier signal, hence no adjustment is required.

The volume is controlled via the I2C-bus. The de-emphasis capacitor has to be connected externally. The non-controlled audio signal can be obtained from this pin (pin 55) (via a buffer stage).

The FM demodulator can be muted via the I

C-bus. This function can be used to switch-off the sound during a channel change so that high output peaks are prevented (also on the de-emphasis output).

The TDA8373 and TDA8374 contain an Automatic Volume Levelling (AVL) circuit which automatically stabilizes the audio output signal to a certain level which can be set by the user via the volume control. This function prevents big audio output fluctuations due to variations of the modulation depth of the transmitter. The AVL function can be activated via the I2C-bus.

Synchronization circuit

The sync separator is preceded by a controlled amplifier which adjusts the sync pulse amplitude to a fixed level. These pulses are fed to the slicing stage which operates at 50% of the amplitude.

The separated sync pulses are fed to the first phase detector and to the coincidence detector. The coincidence detector is used to detect whether the line oscillator is synchronized and can also be used for transmitter identification. The circuit can be made less sensitive by using the STM bit. This mode can be used during search tuning to ensure that the tuning system will not stop at very weak input signals. The first PLL has a very high static steepness so that the phase of the picture is independent of the line frequency.

The line oscillator operates at twice the line frequency. The oscillator capacitor is internal. Because of the spread of internal components an automatic calibration circuit has been added to the IC. The circuit compares the oscillator frequency with that of the crystal oscillator in the colour decoder.

1997 Jul 01 15

Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

This results in a free-running frequency which deviates less than 2% from the typical value. When the IC is switched on the horizontal output signal is suppressed and the oscillator is calibrated as soon as all subaddress bytes have been sent. When the frequency of the oscillator is correct the horizontal drive signal is switched on. To obtain a smooth switching on and switching off behaviour of the horizontal output stage the horizontal output frequency is doubled during switch-on and switch-off (slow start/stop). During that time the duty cycle of the output pulse has such a value that maximum safety is obtained for the output stage.

To protect the horizontal output transistor, the horizontal drive is immediately switched off (via the slow stop procedure) when a power-on reset is detected. The drive signal is switched on again when the normal switch-on procedure is followed, i.e. all subaddress bytes must be sent and, after calibration, the horizontal drive signal will be released again via the slow start procedure.

When the coincidence detector indicates an out-of-lock situation the calibration procedure is repeated.

The circuit has a second control loop to generate the drive pulses for the horizontal driver stage. The horizontal output is gated with the flyback pulse so that the horizontal output transistor cannot be switched on during the flyback time.

Adjustments can be made to the horizontal shift, vertical shift, vertical slope, vertical amplitude and the S-correction via the I2C-bus. In the TDA8375A, TDA8377A, TDA8375 and TDA8377 the E-W drive can also be adjusted via the I2C-bus. The TDA8375 and TDA8377 have a flexible zoom adjustment possibility for the vertical and horizontal deflection. When the horizontal scan is reduced to display 4 : 3 pictures on a 16 : 9 picture tube an accurate video blanking can be switched on to obtain well defined edges on the screen. The geometry processor has a differential output for the vertical drive signal and a single-ended output for the E-W drive (TDA8375A, TDA8377A, TDA8375 and TDA8377). Overvoltage conditions (X-ray protection) can be detected via the EHT tracking pin. When an overvoltage condition is detected the horizontal output drive signal will be switched off via the slow stop procedure. However, it is also possible that the drive is not switched off and that just a protection indication is given in the I2C-bus output byte. The choice is made via the input bit PRD. The ICs have a second protection input on the phase-2 filter capacitor pin. When this input is activated the drive signal is switched off immediately (without slow stop) and switched on again via the slow start procedure.

For this reason this protection input can be used as ‘flash protection’.

The drive pulses for the vertical sawtooth generator are obtained from a vertical countdown circuit. This countdown circuit has various windows depending on the incoming signal (50 or 60 Hz and standard or non-standard). The countdown circuit can be forced in various modes via the I2C-bus. To obtain short switching times of the countdown circuit during a channel change the divider can be forced in the search window using the NCIN bit.

The vertical deflection can be set in the de-interlace mode via the I2C-bus.

To avoid damage of the picture tube when the vertical deflection fails, the guard output current of the TDA8350 and TDA8351 can be supplied to the beam current limiting input. When a failure is detected the RGB outputs are blanked and a bit is set (NDF) in the status byte of the I2C-bus. When no vertical deflection output stage is connected this guard circuit will also blank the output signals. This can be overruled using the EVG bit.

Chrominance and luminance processing

The circuit contains a chrominance band-pass and trap circuit. The filters are realized by using gyrator circuits. They are automatically calibrated by comparing the tuning frequency with the crystal frequency of the decoder. The luminance delay line and the delay for the peaking circuit are also realized by using gyrator circuits. The centre frequency of the chrominance band-pass filter is 10% higher than the subcarrier frequency. This compensates for the high frequency attenuation of the IF saw filter. During SECAM reception the centre frequency of the chrominance trap is reduced to obtain a better suppression of the SECAM carrier frequencies. All ICs have a black stretcher circuit which corrects the black level for incoming video signals which have a deviation between the black level and the blanking level (back porch).

The TDA8375A, TDA8377A, TDA8375 and TDA8377 have a defeatable coring function in the peaking circuit.

Some of the ICs have a YUV interface so that picture improvement ICs such as the TDA9170 (contrast improvement), TDA9177 (sharpness improvement) and TDA4556 and TDA4566 (CTI) can be applied. When the TDA4556 or TDA4566 is applied it is possible to increase the gain of the luminance channel by using the GAI bit in subaddress 03 so that the resulting RGB output signals will not be affected.

1997 Jul 01 16

Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

Colour decoder

Depending on the IC type the colour decoder can decode NTSC signals (TDA8373 and TDA8377) or PAL/NTSC signals (TDA8374 and TDA8375). The circuit contains an alignment-free crystal oscillator, a killer circuit and two colour difference demodulators. The 90° phase shift for the reference signal is made internally.

The TDA8373 and TDA8377 contain an Automatic Colour Limiting (ACL) circuit which prevents over saturation occurring when signals with a high chroma-to-burst ratio are received. This ACL function is also available in the TDA8374 and TDA8375, however, it is only active during the reception of NTSC signals.

The TDA8373 and TDA8377 have a switchable colour difference matrix (via the I

C-bus) so that the colour

reproduction can be adapted to the market requirements. In the TDA8374 and TDA8375 the colour difference matrix

switches automatically between PAL and NTSC, however, it is also possible to fix the matrix in the PAL standard.

The TDA8374 and TDA8375 can operate in conjunction with the SECAM decoder TDA8395 so that an automatic multistandard decoder can be realized. The subcarrier reference output for the SECAM decoder can also be used as a reference signal for a comb filter. Consequently, the reference signal is continuously available when PAL or NTSC signals are detected and only present during the vertical retrace period when a SECAM signal is detected.

Which standard the TDA8374 and TDA8375 can decode depends on the external crystals. The crystal to be connected to pin 34 must have a frequency of 3.5 MHz (NTSC-M, PAL-M or PAL-N). Pin 35 can handle crystals with a frequency of 4.4 and 3.5 MHz. Because the crystal frequency is used to tune the line oscillator, the value of the crystal frequency must be communicated to the IC via the I2C-bus. It is also possible to use the IC in the so called ‘3-norma’ mode for South America. In that event one crystal must be connected to pin 35 and the other two to pin 34. Switching between the 2 latter crystals must be performed externally. Consequently, the search loop of the decoder must be controlled by the microcontroller. To prevent calibration problems of the horizontal oscillator the external switching between the two crystals should be performed when the oscillator is forced to pin 35.

For a reliable calibration of the horizontal oscillator it is very important that the crystal indication bits (XA and XB) are not corrupted. For this reason the crystal bits can be read in the output bytes so that the software can check the I

C-bus transmission.

RGB output circuit and black current stabilization

The colour difference signals are matrixed with the luminance signal to obtain the RGB signals. Linear amplifiers have been chosen for the RGB inputs so that the circuit is suited for signals that are input from the SCART connector. The insertion blanking can be switched on or off using the IE1 bit. To ascertain whether the insertion pin has a (continuous) HIGH level or not can be read via the IN1 bit. The contrast and brightness control operate on internal and external signals.

The output signal has an amplitude of approximately 2 V (black-to-white) at nominal input signals and nominal settings of the controls. To increase the flexibility of the IC it is possible to add OSD and/or teletext signals directly at the RGB outputs. This insertion mode is controlled via the insertion input. The action to switch the RGB outputs to black has some delay which must be compensated for externally.

The black current stabilization is realized by using a feedback from the video output amplifiers to the RGB control circuit. The black current of the 3 guns of the picture tube is internally measured and stabilized. The black level control is active during 4 lines at the end of the vertical blanking. The vertical blanking is adapted to the incoming CVBS signal (50 or 60 Hz). When the flyback time of the vertical output stage is longer than the 60 Hz blanking time, or when additional lines need to be blanked (e.g. for close captioning lines) the blanking can be increased to the same value as that of the 50 Hz blanking. This can be set using the LBM bit. The leakage current is measured during the first line and, during the following 3 lines, the 3 guns are adjusted to the required level. The maximum acceptable leakage current is ±100 µA. The nominal value of the black current is 10 µA. The ratio of the currents for the various guns automatically tracks with the white point adjustment so that the background colour is the same as the adjusted white point.

1997 Jul 01 17

Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

The input impedance of the black current measuring pin is 14 kΩ. To prevent the voltage on this pin exceeding the supply voltage during scan an internal protection diode has been included.

When the TV receiver is switched on the black current stabilization circuit is not active, the RGB outputs are blanked and the beam current limiting input pin is short-circuited. Only during the measuring lines will the outputs supply a voltage of 4.2 V to the video output stage

to ascertain whether the picture tube is warming up. As soon as the current supplied to the measuring input exceeds a value of 190 µA the stabilization circuit will be activated. After a waiting time of approximately 0.8 s the blanking and beam current limiting input pins are released. The remaining switch-on behaviour of the picture is determined by the external time constant of the beam current limiting network.

C-bus speciﬁcation

Table 3 Slave address (8A)

A6 A5 A4 A3 A2 A1 A0 R/W

1000101I/O

The slave address is identical for all types. The subaddresses of the various types are slightly different. The list of subaddresses for each type is given in Tables 4, 6, 8 and 10.

TART-UP PROCEDURE

Read the status bytes until POR = 0 and send all subaddress bytes. The horizontal output signal is switched

on when the oscillator is calibrated. Each time before the data in the IC is refreshed, the status bytes must be read. If POR = 1, then the procedure given above must be carried out to restart the IC. When this procedure is not followed the horizontal frequency in the TDA8374 and TDA8375 may be incorrect after power-up or a power dip.

1997 Jul 01 18

Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

TDA8373

Valid subaddresses: 00 to 16 (subaddresses 04 to 07 are not used), subaddress FE is reserved for test purposes. Auto-increment mode available for subaddresses.

Table 4 Inputs

Table 5 Output status bytes (note 1)

Note

1. X = don’t care.

FUNCTION

SUB

ADDRESS

DATA BYTE

D7 D6 D5 D4 D3 D2 D1 D0

Control 0 00 INA INB INC 0 FOA FOB 0 0 Control 1 01 0 0 DL STB POC 0 1 1 Hue 02 AVL AKB A5 A4 A3 A2 A1 A0 Horizontal Shift (HS) 03 VIM GAI A5 A4 A3 A2 A1 A0 Vertical Slope (VS) 08 NCIN STM A5 A4 A3 A2 A1 A0 Vertical Amplitude (VA) 09 VID LBM A5 A4 A3 A2 A1 A0 S-Correction (SC) 0A 0 EVG A5 A4 A3 A2 A1 A0 Vertical shift (VSH) 0B SBL PRD A5 A4 A3 A2 A1 A0 White point R 0C 0 0 A5 A4 A3 A2 A1 A0 White point G 0D 0 0 A5 A4 A3 A2 A1 A0 White point B 0E MAT 0 A5 A4 A3 A2 A1 A0 Peaking 0F 0000A3A2A1A0 Brightness 10 RBL 0 A5 A4 A3 A2 A1 A0 Saturation 11 IE1 0 A5 A4 A3 A2 A1 A0 Contrast 12 AFW IFS A5 A4 A3 A2 A1 A0 AGC takeover 13 0 VSW A5 A4 A3 A2 A1 A0 Volume control 14 SM FAV A5 A4 A3 A2 A1 A0 Adjustment IF-PLL 15 L’FA A6 A5 A4 A3 A2 A1 A0 Spare 16 00000000

OUTPUT ADDRESS D7 D6 D5 D4 D3 D2 D1 D0

00 POR X X SL XPR CD2 CD1 CD0 01 NDF IN1 X IFI AFA AFB SXA SXB 02 X X X IVW X ID2 ID1 ID0

1997 Jul 01 19

Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

TDA8374, TDA8374AH and TDA8374BH

Valid subaddresses: 00 to 16 (subaddresses 04 to 07 are not used), subaddress FE is reserved for test purposes. Auto-increment mode available for subaddresses.

Table 6 Inputs (notes 1 and 2)

Notes

1. The AVL and MOD bit are not available in the TDA8374A.

2. In the TDA8374B the AVL and MOD bit is also missing and the CM0 to CM2 and CD0 to CD2 bits have less

possibilities because this IC can only decode PAL or PAL/SECAM signals (when the TDA8395 is applied).

Table 7 Output status bytes (note 1)

Note

1. X = don’t care.

FUNCTION

SUB

ADDRESS

DATA BYTE

D7 D6 D5 D4 D3 D2 D1 D0

Control 0 00 INA INB INC 0 FOA FOB XA XB Control 1 01 FORF FORS DL STB POC CM2 CM1 CM0 Hue 02 AVL AKB A5 A4 A3 A2 A1 A0 Horizontal Shift (HS) 03 VIM GAI A5 A4 A3 A2 A1 A0 Vertical Slope (VS) 08 NCIN STM A5 A4 A3 A2 A1 A0 Vertical Amplitude (VA) 09 VID LBM A5 A4 A3 A2 A1 A0 S-Correction (SC) 0A 0 EVG A5 A4 A3 A2 A1 A0 Vertical shift (VSH) 0B SBL PRD A5 A4 A3 A2 A1 A0 White point R 0C 0 0 A5 A4 A3 A2 A1 A0 White point G 0D 0 0 A5 A4 A3 A2 A1 A0 White point B 0E MAT 0 A5 A4 A3 A2 A1 A0 Peaking 0F 0000A3A2A1A0 Brightness 10 RBL 0 A5 A4 A3 A2 A1 A0 Saturation 11 IE1 0 A5 A4 A3 A2 A1 A0 Contrast 12 AFW IFS A5 A4 A3 A2 A1 A0 AGC takeover 13 MOD VSW A5 A4 A3 A2 A1 A0 Volume control 14 SM FAV A5 A4 A3 A2 A1 A0 Adjustment IF-PLL 15 L’FA A6 A5 A4 A3 A2 A1 A0 Spare 16 00000000

OUTPUT ADDRESS D7 D6 D5 D4 D3 D2 D1 D0

00 POR FSI X SL XPR CD2 CD1 CD0 01 NDF IN1 X IFI AFA AFB SXA SXB 02 X X X IVW X ID2 ID1 ID0

1997 Jul 01 20

Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

TDA8375 and TDA8375AH

Valid subaddresses: 00 to 16, subaddress FE is reserved for test purposes. Auto-increment mode available for subaddresses.

Table 8 Inputs

Note

1. The vertical zoom byte and the HBL bit are active only in the TDA8375.

Table 9 Output status bytes (note 1)

Note

1. X = don’t care.

FUNCTION

SUB

ADDRESS

DATA BYTE

D7 D6 D5 D4 D3 D2 D1 D0

Control 0 00 INA INB INC 0 FOA FOB XA XB Control 1 01 FORF FORS DL STB POC CM2 CM1 CM0 Hue 02 HBL AKB A5 A4 A3 A2 A1 A0 Horizontal Shift (HS) 03 VIM GAI A5 A4 A3 A2 A1 A0 E-W width (EW) 04 0 0 A5 A4 A3 A2 A1 A0 E-W Parabola/Width (PW) 05 0 0 A5 A4 A3 A2 A1 A0 E-W Corner Parabola (CP) 06 0 0 A5 A4 A3 A2 A1 A0 E-W trapezium (TC) 07 0 0 A5 A4 A3 A2 A1 A0 Vertical Slope (VS) 08 NCIN STM A5 A4 A3 A2 A1 A0 Vertical Amplitude (VA) 09 VID LBM A5 A4 A3 A2 A1 A0 S-Correction (SC) 0A HCO EVG A5 A4 A3 A2 A1 A0 Vertical shift (VSH) 0B SBL PRD A5 A4 A3 A2 A1 A0 White point R 0C 0 0 A5 A4 A3 A2 A1 A0 White point G 0D 0 0 A5 A4 A3 A2 A1 A0 White point B 0E MAT 0 A5 A4 A3 A2 A1 A0 Peaking 0F 0000A3A2A1A0 Brightness 10 RBL COR A5 A4 A3 A2 A1 A0 Saturation 11 IE1 0 A5 A4 A3 A2 A1 A0 Contrast 12 AFW IFS A5 A4 A3 A2 A1 A0 AGC takeover 13 MOD VSW A5 A4 A3 A2 A1 A0 Volume control 14 SM FAV A5 A4 A3 A2 A1 A0 Adjustment IF-PLL 15 L’FA A6 A5 A4 A3 A2 A1 A0 Vertical zoom (VX)

(1)

16 0 0 A5 A4 A3 A2 A1 A0

OUTPUT ADDRESS D7 D6 D5 D4 D3 D2 D1 D0

00 POR FSI X SL XPR CD2 CD1 CD0 01 NDF IN1 X IFI AFA AFB SXA SXB 02 X X X IVW X ID2 ID1 ID0

1997 Jul 01 21

Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

TDA8377 and TDA8377A

Valid subaddresses: 00 to 16, subaddress FE is reserved for test purposes. Auto-increment mode available for subaddresses.

Table 10 Inputs

Note

1. The vertical zoom byte and the HBL bit are active only in the TDA8377.

Table 11 Output status bytes (note 1)

Note

1. X = don’t care.

FUNCTION

SUB

ADDRESS

DATA BYTE

D7 D6 D5 D4 D3 D2 D1 D0

Control 0 00 INA INB INC 0 FOA FOB 0 1 Control 1 01 0 0 DL STB POC 0 1 1 Hue 02 HBL AKB A5 A4 A3 A2 A1 A0 Horizontal Shift (HS) 03 VIM GAI A5 A4 A3 A2 A1 A0 E-W width (EW) 04 0 0 A5 A4 A3 A2 A1 A0 E-W Parabola/Width (PW) 05 0 0 A5 A4 A3 A2 A1 A0 E-W Corner Parabola (CP) 06 0 0 A5 A4 A3 A2 A1 A0 E-W trapezium (TC) 07 0 0 A5 A4 A3 A2 A1 A0 Vertical Slope (VS) 08 NCIN STM A5 A4 A3 A2 A1 A0 Vertical Amplitude (VA) 09 VID 0 A5 A4 A3 A2 A1 A0 S-Correction (SC) 0A HCO EVG A5 A4 A3 A2 A1 A0 Vertical shift (VSH) 0B SBL PRD A5 A4 A3 A2 A1 A0 White point R 0C 0 0 A5 A4 A3 A2 A1 A0 White point G 0D 0 0 A5 A4 A3 A2 A1 A0 White point B 0E MAT 0 A5 A4 A3 A2 A1 A0 Peaking 0F 0000A3A2A1A0 Brightness 10 RBL COR A5 A4 A3 A2 A1 A0 Saturation 11 IE1 0 A5 A4 A3 A2 A1 A0 Contrast 12 AFW IFS A5 A4 A3 A2 A1 A0 AGC takeover 13 0 VSW A5 A4 A3 A2 A1 A0 Volume control 14 SM FAV A5 A4 A3 A2 A1 A0 Adjustment IF-PLL 15 L’FA A6 A5 A4 A3 A2 A1 A0 Vertical zoom (VX)

(1)

16 0 0 A5 A4 A3 A2 A1 A0

OUTPUT ADDRESS D7 D6 D5 D4 D3 D2 D1 D0

00 POR X X SL XPR CD2 CD1 CD0 01 NDF IN1 X IFI AFA AFB SXA SXB 02 X X X IVW X ID2 ID1 ID0

1997 Jul 01 22

Philips Semiconductors Preliminary speciﬁcation

I2C-bus controlled economy PAL/NTSC and NTSC TV-processors

TDA837x family

INPUT CONTROL BITS

Table 12 Source select

Table 13 Phase 1 (ϕ-1) time constant

Table 14 Crystal indication

Table 15 Forced ﬁeld frequency TDA8374 and TDA8375

Note

1. When switched to this mode while locked to a 50 Hz signal, the divider will only switch to forced 60 Hz when an

out-of-sync is detected in the horizontal PLL.

INA INB INC

SELECTED SIGNALS

(DECODER AND AUDIO)

SWITCH OUTPUT

0 0 0 internal CVBS plus audio internal CVBS 0 0 1 external CVBS plus audio external CVBS 0 1 0 Y/C plus external audio Y/C (Y plus C) 0 1 1 CVBS3 plus external audio CVBS3 1 0 0 Y/C plus internal audio internal CVBS 1 1 0 Y/C plus external audio external CVBS

FOA FOB MODE

0 0 normal 0 1 slow and gated 1 0 slow/fast and gated 1 1 fast

XA XB CRYSTAL

0 0 two 3.6 MHz crystals 0 1 one 3.6 MHz crystal (pin 34) 1 0 one 4.4 MHz crystal (pin 35) 1 1 3.6 MHz and 4.4 MHz crystals (pins 34 and 35)

FORF FORS FIELD FREQUENCY

0 0 auto (60 Hz when line not synchronized) 0 1 60 Hz; note 1 1 0 keep last detected ﬁeld frequency 1 1 auto (50 Hz when line not synchronized)

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