Datasheet Tda4780 Datasheet (Philips)

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INTEGRATED CIRCUITS

DATA SH EET

TDA4780

RGB video processor with automatic cut-off control and gamma adjust

Preliminary speciﬁcation File under Integrated Circuits, IC02

May 1994

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

FEATURES

• Gamma adjust

• Dynamic black control (adaptive black)

• All input signals clamped on black-levels

• Automatic cut-off control, alternative: output clamping

on fixed levels

• Three adjustable reference voltage levels via I2C-bus for automatic cut-off control

• Luminance/colour difference interface

• Two luminance input levels allowed

• Two RGB interfaces controlled by either fast switches or

by I2C-bus

• Two peak drive limiters, selection via I2C-bus

• Blue stretch, selection via I2C-bus

• Luminance output for scan velocity modulation

(SCAVEM)

• Extra luminance output; same pin can be used as hue control output e.g. for the TDA4650 and TDA4655

• Non standard operations like 50 Hz/32 kHz are also possible

• Either 2 or 3 level sandcastle pulse applicable

• High bandwidth for 32 kHz application

TDA4780

• White point adjusts via I

• Average beam current and improved peak drive limiting

• Two switch-on delays to prevent discolouration during

start-up

• All functions and features programmable via I2C-bus

• PAL/SECAM or NTSC matrix selection.

GENERAL DESCRIPTION

The TDA4780 is a monolithic integrated circuit with a luminance and a colour difference interface for video processing in TV receivers. Its primary function is to process the luminance and colour difference signals from a colour decoder which is equipped e.g. with the multistandard decoder TDA4655 or TDA9160 plus delay line TDA4661 or TDA4665 and the Picture Signal Improvement (PSI) IC TDA467x or from a Feature Module.

(continued)

C-bus

QUICK REFERENCE DATA

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

V I

V V V V

8(p-p) 6(p-p) 7(p-p) 14

supply voltage (pin 5) 7.2 8.0 8.8 V supply current (pin 5) 80 100 120 mA luminance input (peak-to-peak value) (C)VBS − 0.45/ 1.43 − V

−(B−Y) input (peak-to-peak value) − 1.33 − V

−(R−Y) input (peak-to-peak value) − 1.05 − V

three-level sandcastle pulse

H+V − 2.5 − V H − 4.5 − V BK − 8.0 − V

two-level sandcastle pulse

H+V − 2.5 − V BK − 4.5 − V

O(p-p)

amb

RGB input signals at pins 2, 3, 4, 10, 11 and 12 (black-to-white value) − 0.7 − V RGB output at pins 24, 22 and 20 (black-to-white value) − 2.0 − V operating ambient temperature −20 −+70 °C

May 1994 2

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

ORDERING INFORMATION

EXTENDED

TYPE NUMBER

TDA4780 28 DIL plastic SOT117

Note

1. SOT117-1; 1996 December 9.

PINS

POSITION

TDA4780

PACKAGE

MATERIAL CODE

(1)

May 1994 3

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

TDA4780

Fig.1 Block diagram (continued in Fig.2)

May 1994 4

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

TDA4780

Fig.2 Block diagram (continued from Fig.1)

May 1994 5

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

PINNING

SYMBOL PIN DESCRIPTION

FSW

−(B−Y) 6 colour difference input −(B−Y)

−(R−Y) 7 colour difference input −(R−Y)

Y 8 luminance input GND 9 ground R

FSW

SC 14 sandcastle pulse input BCL 15 average beam current limiting

PDL

PDST

CI 19 cut-off measurement input B

YHUE 26 Y-output/hue adjust output SDA 27 I

SCL 28 I

1 fast switch 2 input 2 red input 2 3 green input 2 4 blue input 2 5 supply voltage

10 red input 1 11 green input 1 12 blue input 1 13 fast switch 1 input

input

16 storage capacitor for peak

limiting

17 storage capacitor for leakage

current compensation

18 storage capacitor for peak dark

20 blue output 21 blue cut-off storage capacitor 22 green output 23 green cut-off storage capacitor 24 red output 25 red cut-off storage capacitor

C-bus serial data

input/acknowledge output

C-bus serial clock input

TDA4780

Fig.3 Pin configuration.

May 1994 6

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

GENERAL DESCRIPTION

(continued)

The required input signals are:

• luminance and negative colour difference signals

• 2- or 3-level sandcastle pulse for internal timing pulse

generation

• I2C-bus data and clock signals

Two sets of analog RGB colour signals can also be inserted, e.g. one from a peritelevision connector (SCART plug) and the other one from an on-screen display (OSD) generator. The TDA4780 has I2C-bus control of all parameters and functions with automatic cut-off control of the picture tube cathode currents. It provides RGB output signals for the video output stages. In clamped output mode it can also be used as an RGB source. The main differences to the sister type TDA4680 are:

• additional features, namely gamma adjust, adaptive black, blue stretch and two different peak drive limiters.

• the measurement lines are triggered by the trailing edge of the vertical component of the sandcastle pulse.

• I2C-bus receiver only. Automatic white level control is not provided; the white levels are determined directly by the I2C-bus data.

• the TDA4780 is pin compatible (except pin 18) to the TDA4680. The slave address via the I2C-bus can be used for both ICs; where a function is not included in the TDA4680 then the I2C-bus command is not executed. Special commands (except control bit FSWL) for the TDA4680 will be ignored by the TDA4780.

TDA4780

FUNCTIONAL DESCRIPTION Signal input stages

The TDA4780 contains 3 sets of input signal stages for: a) Luminance/colour-difference signals: (Y: 0.45 V(p-p) VBS or 1.43 V(p-p) VBS, selectable via I

1.05 V(p-p); −(B−Y): 1.33 V(p-p)). The capacitively coupled signals are matrixed to RGB signals by either a PAL/SECAM or NTSC matrix (selected via I2C-bus). b) (RGB)1signals (0.7 V(p-p) VB), capacitively coupled (e.g. from external source). c) (RGB)2signals (0.7 V(p-p) VB), capacitively coupled (e.g. videotext, OSD). All input signals are clamped in order to have the same black levels at the signal switch input. Displayed signals must be synchronous with the sandcastle pulse.

Signal switches

Both fast signal switches can be operated by switching pins (e.g. SCART facilities) or set via the I switch 1 the Y-CD signals or the (RGB)1signals can be selected, by switch 2 the above selected signals or the (RGB)2signals are enabled. During the vertical and horizontal blanking time an artificial black level equal to the clamped black level is inserted in order to clip off the sync pulse of the luminance signal and to suppress hum during the cut-off measurement time and eliminate noise during these intervals.

Saturation, gamma, contrast and brightness adjust

Saturation, contrast and brightness adjusts are adjusted via the I signals. Gamma acts on the luminance content of the input signals.

C-bus and act on Y, CD as well as on RGB input

C-bus, −(R−Y):

C-bus. By

May 1994 7

Gamma adjust

The gamma adjust stage has a non-linear transmission characteristic according to the formula y = x represents the input and y the output signal. If gamma is smaller than unity, the lower parts of the signal are amplified with higher gain.

Adaptive black (ADBL) The adaptive black stage detects the lowest voltage of the

luminance component of the internal RGB signals during the scanning time and shifts it to the nominal black level. In order to keep the nominal white level the contrast is increased simultaneously.

gamma

, where x

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

Blue stretch (BLST) The blue stretch channel gets additional amplification if the

blue signal is greater than 80% of the nominal signal amplitude. In that case the white point is shifted towards higher colour temperature so that white parts of a picture seem to be brighter.

Measurement pulse and blanking stage

During the vertical and horizontal blanking time and the measurement period the signals are blanked to an ultra black level, so the leakage current of the picture tube can be measured and automatically compensated for. During the cut-off measurement lines (one line period for each R, G or B) the output signal levels are at cut-off measurement level. The vertical blanking period is timed by the sandcastle pulse. The measurement pulses (leakage, R, G and B) are triggered by the negative going edge of the vertical pulse of the sandcastle pulse and start after the following horizontal pulse. The IC is prepared for 2f

Output ampliﬁer and white adjust potentiometer

(32 kHz) application.

TDA4780

limiting, that is activated if one of the RGB signals even shortly exceeds a via I2C-bus adjusted threshold. The latter can be either referred to the cut-off measurement level of the outputs or to ground. When signal limiting occurs, contrast is reduced, and at minimum contrast brightness is reduced additionally.

Sandcastle decoder and timer

A 3-level detector separates the sandcastle pulse into combined line and field pulses, line pulses, and clamping pulses. The timer contains a line counter and controls the cut-off control measurement. Application with a 2-level 5 V sandcastle pulse is possible.

Switch on delay circuit

After switch on all signals are blanked and a warm up test pulse is fed to the outputs during the cut-off measurement lines. If the voltage at the cut-off measurement input exceeds an internal level the cut-off control is enabled but the signal remains still blanked. The signal blanking is finished when the cut-off control has stabilized. In case of output clamping, the cut-off control is disabled and the switch on procedure will be skipped.

The RGB signals are amplified to nominal 2 V(p-p), the DC-levels are shifted according to cut-off control. The nominal signal amplitude can be varied by ±50% by the white point adjustment via the I RGB respect).

Automatic cut-off control

During leakage measurement time the leakage current is compensated in order to get a reference voltage at the cut-off measurement info pin. This compensation value is stored in an external capacitor. During cut-off current measurement times for the R, G and B channels, the voltage at this pin is compared with the reference voltage, which is individually adjustable via

C-bus for each colour channel. The so derived control

I voltages are stored in the external feedback capacitors. Shift stages add these voltages to the corresponding output signals. The automatic cut-off control may be disabled via the I2C-bus. In this mode the output voltage is clamped to

2.5 V. Clamping periods are the same as the cut-off

measurement periods.

Signal limiting

C-bus (individually for

Y output and hue adjust

The TDA4780 contains a D/A converter for hue adjust. The analog information can be fed, e.g. to the multistandard decoder TDA4650 or TDA4655. This output pin may be switched to a Y output signal, which can be used for scan velocity modulation (SCAVEM). The Y output is the Y input signal or the matrixed (RGB) input signal according to the switch position of fast switch.

C-bus

The TDA4780 contains an I2C-bus receiver for control function.

ESD protection

Pins are provided with protection diodes against ground and supply voltage (see pin description).

C-bus input pins do not shunt the I2C-bus signals in case

I of missing supply voltage.

EMC

Pins are protected against electromagnetic radiation.

The TDA4780 provides two kinds of signal limiting. First, an average beam limiting, that reduces signal level if a certain average is exceeded. Second, a peak drive

May 1994 8

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic

TDA4780

cut-off control and gamma adjust

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

SYMBOL PARAMETER MIN. MAX. UNIT

stg

amb

tot

= V

5-9

10,11,12-9

2,3,4-9

8,7,6-9

13,1-9

25,23,21,17-9

14-9

15-9

16-9

27,28-9

18-9

19-9

24,22,20

ESD electrostatic handling (note 1) for all pins −500 +500 V

storage temperature −20 +150 °C operating ambient temperature −20 +70 °C total power dissipation − 1200 mW supply voltage −0.1 +9.0 V (RGB)1inputs −0.1 V (RGB)2inputs −0.1 V Y, CD-inputs −0.1 V switch I, II −0.1 V black level, leakage storage −0.1 V

P P P P P

sandcastle −0.7 VP+ 5.8 V average current inf. −0.7 VP+ 0.7 V peak drive storage −0.1 V I2C-bus −0.1 V

P P

Y output / hue adjust −8 − mA peak dark storage −0.1 V

cut-off control input −0.7 VP+ 0.7 V output peak −20 − mA output average −10 − mA

V V V V V

V V

Note to the Limiting Values

1. Charge device model class A: discharging a 200 pF capacitor through a 0 Ω series resistor.

THERMAL RESISTANCE

SYMBOL PARAMETER THERMAL RESISTANCE

th j-a

from junction to ambient in free air 47 K/W

QUALITY SPECIFICATION

URV-4-2-59/601

May 1994 9

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic

TDA4780

cut-off control and gamma adjust

CHARACTERISTICS

= +25 °C; VP= 8 V; V

amb

gamma = 1; adaptive black inactive; brightness, contrast, saturation and white balance at nominal settings; no beam current or peak drive limiting; all voltages are related to ground (pin 9) and measured in Figs 1 and 2; unless otherwise speciﬁed.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

supply voltage (pin 5) 7.2 8 8.8 V supply current (pin 5) − 100 120 mA

Colour-difference inputs (−(B−Y): pin 6, −(R−Y): pin 7; capacitively coupled to a low ohmic source; recommendation: maximum 600 Ω)

−(B−Y) signal (peak-to-peak value)

6,7

internal bias during clamping − 4.0 − V DC input current between

clamping pulses

6,7

maximum input current during clamping

−(R−Y) signal (peak-to-peak value)

6,7

AC input resistance 10.0 −− MΩ Y input (pin 8; capacitively coupled to a low ohmic source; recommendation: maximum 600 Ω) V

input signal (composite signal;

VBS; peak-to-peak value)

AC input resistance 10.0 −− MΩ

internal bias during clamping YHI = 0 − 3.7 − V

DC input current between

clamping pulses I

maximum input current during

clamping

: nominal signal amplitude (black-white) 2000 mV (peak-to-peak value) at output pins;

nom

75% colour bar signal − 1.33 − V

−− 0.1 µA

100 180 260 µA

75% colour bar signal − 1.05 − V

adaption to two different signal levels via control bit YHI

YHI = 0 − 0.45 − V YHI = 1 − 1.43 − V

YHI = 1 − 4.6 − V

−− 0.1 µA

100 180 260 µA

RGB input 1 (R

: pin 10, G1: pin 11, B1: pin 12; capacitively coupled to a low ohmic source;

recommendation: maximum 600 Ω; note 1) V

10,11,12

input signal (peak-to-peak value) − 0.7 − V

AC input resistance 10.0 −− MΩ

internal bias during clamping − 5.1 − V

DC input current between

clamping pulses I

10,11,12

maximum input current during

clamping

May 1994 10

−− 0.1 µA

100 180 260 µA

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic

TDA4780

cut-off control and gamma adjust

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

RGB input 2 (R2: pin 2, G2: pin 3, B2: pin 4; capacitively coupled to a low ohmic source;

recommendation: maximum 600 Ω; note 1) V

2,3,4

PAL/SECAM and NTSC matrix (note 2; for demodulation axis see appendix) PAL/SECAM matrix control bit NMEN = 0

NTSC matrix control bit NMEN = 1; hue position set on (−2) degrees Fast signal switches and blanking (fast signal switch 1 (pin 13); Y, CD / R V

Crosstalk (see Table 2)

− t

input signal (peak-to-peak value) − 0.7 − V

AC input resistance 10.0 −− MΩ

internal bias during clamping − 5.1 − V

DC input current between

−− 0.1 µA

clamping pulses

maximum input current during

100 180 260 µA

clamping

, G1; B1; control bits FSDIS1, FSON1)

voltage to select Y and CD − 0 0.4 V

voltage range to select R1, G

and B

0.9 1.0 5.5 V

internal resistor to ground 3.3 3.8 4.8 kΩ

difference between transit times

−− 10 ns for signal switching and signal insertion

Fast signal switch 2 (pin 1; Y, CD or R V

voltage to select Y and CD / R1,G1and B

voltage range to select R2, G2and B

required minimal voltage to switch off the ADBL measurement

internal resistor to ground R1> R

Crosstalk (see Table 2)

− t

difference between transit times for signal switching and signal insertion

, G1, B1 / R2,G2,B2; control bits FSDIS2, FSON2)

− 0 0.4 V

0.9 1.0 5.5 V

− 0.87 1.0 V

2.8 4.2 6.0 kΩ

−− 10 ns

May 1994 11

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic

TDA4780

cut-off control and gamma adjust

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Adjust stages (adaptive black, gamma, contrast, saturation, brightness and white point adjust, blue stretch)

Adaptive black (detectors inactive status due to action of fast switch 2 (pin 1); see Table 1, Fig.9 and note 3) I

discharge current of peak dark storage capacitor

charge current of peak dark storage capacitor

maximum level shift: ∆ black level in percent of nominal signal amplitude

difference between nominal black and adaptive black in percent of nominal signal amplitude

detectors inactive time before blanking

detectors inactive time after blanking

Gamma adjust Acts on internal Y signal; Y matrix see Y output; I Resolution 6 bit

range of gamma

minimum (3F maximum (00

) − 0.7 −−

HEX

) − 1.0 −−

HEX

maximum gain at minimum gamma

Saturation adjust Acts on RGB signals; Y matrix see Y output; I Resolution 1.5% of maximum saturation

C-bus data for nominal

I saturation

maximum saturation I

minimum saturation I

outside active

0.1 0.5 1.0 µA

measurement window inside active

1.5 2.5 3.5 µA

measurement window

−360 −300 −250 µA

10 13 16 %

−30 +3%

2.3 3.1 4.0 µs

2.3 2.5 3.4 µs

C-bus controlled potentiometer (subaddress 0B)

near nominal black 5 6 7 dB

C-bus controlled potentiometers (subaddress 01)

1F 20 21 HEX

C-bus data 3F

HEX;

4.9 5.5 6.1 dB

measured at 100 kHz; relative to nominal saturation

C-bus data 00

HEX;

−− −50 dB

measured at 100 kHz; relative to typical value of maximum saturation

May 1994 12

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic

TDA4780

cut-off control and gamma adjust

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Contrast adjust Acts on RGB signals; I2C-bus controlled potentiometers (subaddress 02) Resolution 1.5% of maximum contrast

C-bus data for nominal contrast 20 22 24 HEX

maximum contrast I

C-bus data 3F

HEX;

limiters inactive; relative to nominal contrast

minimum contrast I

C-bus data 00

HEX;

relative to maximum

Brightness adjust

Acts on RGB signals; I

C-bus controlled potentiometers (subaddress 00)

Resolution 1.5% of range; ∆ black level in percent of nominal signal amplitude referred to cut-off measuring level

maximum brightness: ∆ black

HEX

level nominal brightness: ∆ black level 29 minimum brightness: ∆ black level 00 maximum brightness: ∆ black

level minimum brightness: ∆ black level 00

HEX HEX

HEX;

control bits

3F BCOF = 1 and MOD2 = 0

control bits

HEX;

BCOF = 1 and MOD2 = 0

Blue stretch

Blue stretch is activated by I

C-bus control bit BLST = 1 (see Fig.11)

increase of small signal gain 100% of nominal signal

amplitude and at 1 MHz

Differences of black level steps Differences from channel to channel of the ratio of the difference (black level cut-off measurement level) to actual nominal signal amplitude (V

nom24,Vnom22,Vnom20

) over the whole contrast, brightness and saturation range, switching

matrix or switching fast switches, gamma = 1, BLST = 0, ADBL = 0 dV/V

static deviation dV/V

nom

dV22/V dV20/V dV20/V

nom

nom22 nom20 nom20;

= dV24/V

=dV24/ V

= dV22/V

ripple on pin 5

nom24

−

nom24 −

nom22

during clamping ≤ 1 mV; note 8

at nominal saturation −0.5 −+0.5 %

− 4.5 5.5 dB

−28 −22 −16 dB

23 30 37 %

−70 +7%

−58 −50 −42 %

23 30 37 %

−58 −50 −42 %

15 20 25 %

−1.0 −+1.0 %

−

May 1994 13

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic

TDA4780

cut-off control and gamma adjust

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

RGB outputs (output for positive RGB signals (R: pin 24, G: pin 22, B: pin 20); following data without external load)

24,22,20

Output clamp (RGB) V

20,22,24

White potentiometers

Overall white point deviation dV/V

differential output resistance − 25 30 Ω maximum output current 4.0 5.0 − mA minimum output voltage note 9 −− 0.8 V maximum output voltage RL≥ 2 kΩ 6.3 7.0 − V maximum signal amplitude

3.3 −− V (black-white) due to internal limits (peak-to-peak value)

nominal signal amplitude (black-white; peak-to-peak value)

at nominal white adjust; contrast and saturation

1.7 2.0 2.3 V

setting; gamma = 1; nominal input signals

range of cut-off measurement

note 9 1.0 − 5.0 V

level recommended cut-off

− 3.0 − V measurement level

clamp voltage black level control bit BCOF = 1 2.3 2.5 2.7 V

C-bus data for nominal settings 21 22 23 HEX

I maximum increase of AC gain 3F maximum decrease of AC gain 00

nom

dV/V dV22/V dV20/V dV20/V

nom

nom22 nom20 nom20

= dV24/V

= dV24/V = dV22/V

nom24

nom24 nom22

meaning of actual nominal signal see ‘differences of black level step’; over whole contrast range see ‘contrast adjust’

HEX

−

input: (RGB)

1,2

differences from channel to channel of the ratio of the difference (signal white level cut-off measurement level) to actual nominal signal amplitude (V V

nom 20

nom 24, Vnom 22,

) over the whole

40 50 60 % 40 50 60 %

−2.0 −+2.0 %

saturation range at nominal contrast, brightness and nominal input signals; ripple on pin 5 during clamping ≤ 1 mV; note 8

Frequency behaviour, crosstalk

Between the Y input (pin 8) and the RGB outputs (pins 24, 22 and 20)

decrease in gain 1 MΩ and 20 pF load at

−− 3dB

13 MHz

Between the colour-difference inputs (pins 7 and 6) and the corresponding R and B outputs (pins 24 and 20)

decrease in gain at 13 MHz −− 3dB

Between the (RGB)

inputs (pins 10, 11 and 12 or 2, 3 and 4) and the RGB outputs (pins 24, 22 and 20)

1,2

decrease in gain at 22 MHz −− 3dB

May 1994 14

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic

TDA4780

cut-off control and gamma adjust

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Sandcastle input (pin 14; control bit SC5; note 4)

14-9

Clamp pulse delay

Required minimal burst gate pulse width

input current V14< 0.5 V −− −100 µA input capacitance −− 10 pF required voltage range

for horizontal and vertical blanking pulses SC5 = 0 or SC5 = 1 2.0 2.5 3.0 V for horizontal pulses (line count) SC5 = 0 4.0 4.5 4.9 V for burst key pulses SC5 = 0 6.1 − V for burst key pulses and

SC5 = 1 4.0 − V

+ 5.8 V

line count

delay of leading edge of clamping pulse

nominal sandcastle pulse DELOF = 0 1.2 1.5 1.8 µs DELOF = 1 − 0 −µs

DELOF = 0 line frequency = 16 kHz 3 −− µs DELOF = 1 line frequency = 32 kHz 1.5 −− µs

Generation of measurement lines and blanking

Blanking to ultra black level occurs during time DG except MR in R-channel, MG in G-channel, MB in B-channel (see pulse diagram Fig.12) Difference between ultra black level (VUB) and measurement level (VCL) in percent of nominal signal amplitude (independent of white point adjust)

dV/V

dV = VCL − VUB no clipping 25 35 45 %

nom

Leakage current measuring time: LM will start after the end of vertical sandcastle (see pulse diagram)

Vertical blanking period and cut-off measurement lines (see pulse diagram) The vertical component will be identiﬁed if it contains 2 or more burst key pulses in case of SC5 = 1 or two or more line pulses (H) in case of SC5 = 0 The line counter is triggered by the leading edge The blanking time is valid for a vertical pulse detected by the sandcastle decoder The internal blank pulse is OR gated with the sandcastle vertical pulse and the end of the measurement pulses

Insertion time: full line period Measurement time: line period minus horizontal period (50/60 Hz)

Line sequence of measuring lines: First line after end of horizontal pulse which followed the end of vertical pulse: leakage measurement LM First line after leakage pulse: red measurement MR Second line after leakage pulse: green measurement MG Third line after leakage pulse: blue measurement MB (see pulse diagram)

May 1994 15

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic

TDA4780

cut-off control and gamma adjust

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Warm up test pulse during MT (see pulse diagram) V

warm up level VWU= VPL− 1 V;

VPL= peak drive level (see also signal limiting); given by I2C-bus; subaddress OA; no warm up test pulse in case of output clamping (BCOF = 1)

maximum warm up level 3F

HEX

Threshold for Power On Reset (POR) during time DG (see pulse diagram) V

20,22,24

POR

output voltage to cause POR RELC = 0 − V

RELC = 1 − V

Y output (pin 26; note 5) V

nominal signal amplitude (black-white; independent of gamma, adaptive black and

control bit YEXH = 1; hue DAC (register 03) set > 28

HEX

contrast; peak-to-peak value)

∆τ

black level YEXH = 1

HEX

Y matrix coefﬁcients Y = a

R+agG+abB

differential output resistance − 190 230 Ω group delay time between RGB outputs and Y

output

3 dB bandwidth 11 15 − MHz

Automatic cut-off control (pin 19; measurement periods see beam info on pin 19) V

permissible voltage (also during scanning period)

REF0

internally controlled voltage on pin 19

during leakage measurement

time LM maximum output current −350 −−250 µA maximum input current 250 − 350 µA input resistance for

measurement input

additional input current only during warm up − 0.5 − mA threshold of warm up detector

(active in line MG)

−− − −

5.6 6.0 6.3 V

− V

+1− V

0.85 1.0 1.15 V

− 4.0 − V

− 2.0 − V

0.27 0.30 0.33 −

0.53 0.59 0.65 −

0.10 0.11 0.12 −

20 25 30 ns

−− V

−1.4 V

2.4 2.7 3.0 V

1 −− MΩ

4.3 4.5 4.7 V

May 1994 16

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic

TDA4780

cut-off control and gamma adjust

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

MEAS

Storage of cut-off control voltage / output clamping voltage (pins 25, 23 and 21) I

25,23,21

I

25,23,21

Storage of leakage information (pin 17) I

difference between input voltage for cut-off and V

REF0;

adjustable

−− − −

via I2C-bus (subaddress for reference: R: 07, G: 08 and B: 09)

maximum V nominal V minimum V

MEAS

input currents of storage inputs

HEX HEX HEX

1.5 1.6 1.7 V

0.9 1.0 1.1 V

0.4 0.45 0.5 V

−− 0.1 µA

outside of the measurement time

 maximum charge / discharge

0.2 0.3 0.4 mA

current during measurement time ampliﬁcation from storage pins

− 1.7 −−

25, 23 and 21 to outputs

maximum charge / discharge

300 400 −µA

current at time LM discharge current peak limiting during time MK

− 4 − mA

active leakage current outside time LM −− 0.1 µA voltage to reset IC to switch on

V17is below 2.3 2.5 3.0 V conditions

Signal limiting (The limitation acts on contrast and at low contrast on brightness) Average beam current limiting (pin 15)

V dV

start of contrast reduction − 4 − V input range for full contrast

reduction

start of brightness reduction − 2.5 − V input range for full brightness

reduction

input current −− −0.5 µA

Peak signal limiting of output signals (pin 16) The limitation acts 1 H delayed

Limiting level adjustable by I V

24,22,20

maximum limiting level extrapolated from 2F 6.8 − 7.2 V minimum limiting level 00 maximum discharge current at

C-bus (subaddress OA; control bit RELC = 0)

HEX

RELC = 0 4 − 6mA peak drive

−−2 − V

−−1.6 − V

− 2.3 3 V

May 1994 17

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic

TDA4780

cut-off control and gamma adjust

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Peak signal limiting (pin 16) Control bit RELC = 1; Limiting Level (V

LiL

maximum limiting level 3F minimum limiting level 00

Peak drive limiting starts, if the maximum of the RGB signals after white point adjustment exceeds a threshold Cut-off measurement level MX = MR or MB or MG

Discharge currents The total discharge current is a summation of I Threshold 1 (TH1) I

16(1)

maximum discharge current TH1 = MX + V

steepness − 1.5 − mA / 0.1 V

Low-pass ﬁlter, control bit TCPL t

DPDL

time constant low-pass ﬁlter TCPL = 1 (at 1fH); RELC = 1 0.9 1.2 1.5 µs time constant low-pass ﬁlter TCPL = 0 (at 2fH); RELC = 1 0.4 0.6 0.8 µs

Threshold 2 (TH2) I

16(2)

maximum discharge current TH2 = MX + V

steepness − 1.5 − mA / 0.1 V

Threshold 3 (TH3) I

16(3)

maximum discharge current TH3 = MX + V steepness − 0.15 − mA / 0.1 V

Charge current I

V dV

charge current −0.5 −1 −2 µA start of contrast reduction − 4 − V input range for full contrast

reduction

start of brightness reduction − 2.5 − V input range for full brightness

reduction

maximum voltage by internal limitation

) adjustable by I2C-bus (subaddress OA)

LiL

equal gain in white point

adjust; signal only in one

output channel

HEX

+ I

16(1)

16(2)

+ I

16(3)

LiL

; 1 line

delayed and low-pass ﬁltered

× 1.10; 1 line

LiL

delayed

; undelayed 0.45 0.6 0.75 mA

LiL

3.3 3.5 3.9 V

1.3 1.5 1.7 V

4.5 6 7.5 mA

−−2 − V

−−1.6 − V

4.5 −− V

Hue adjust output (pin 26; note 6) V

minimum output voltage YEXH = 0; 00 nominal output voltage YEXH = 0; 20 maximum output voltage YEXH = 0; 3F current of internal emitter follower 500 700 −µA

May 1994 18

HEX HEX HEX

0.5 − 1.0 V

3.0 3.2 3.4 V

4.8 − 5.5 V

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic

TDA4780

cut-off control and gamma adjust

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

I2C-bus inputs

SU;DAT

Input levels

clock frequency range 0 − 100 kHz data set-up 250 −− ns clock pulse HIGH 4 −− µs clock pulse LOW 4.7 −− µs rise time −− 1 µs fall time −− 0.3 µs

LOW level input voltage −− 1.5 V

−− 1.5 V

HIGH level input voltage 3.0 − 5.5 V

3.0 − 5.5 V

input current V27= 0.4 V −10 −− µA

V28= 0.4 V −10 −− µA input current V27= 0.9 V −− 10 µA

V28= 0.9 V −− 10 µA LOW level output voltage −− 0.4 V output current V27 = 0.4 V 3.0 −− mA

May 1994 19

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic

TDA4780

cut-off control and gamma adjust

Notes to the characteristics

1. RGB signals controlled by saturation, adaptive black, contrast and brightness, gamma affects the Y component of the internal RGB signals.

2. Matrix coefficients should be tested by comparing RGB output signals with a reference RGB colour bar, which is fed in at (RGB)1or (RGB)2inputs. In case of NMEN = 1 (NTSC) at minimum saturation the Y output and RGB output signals are not identical to the Y input signal. PAL/SECAM signals are matrixed by the equation: V

= −0.51V

G−Y

NTSC signals are matrixed by the equations (hue phase shift of −2 degrees): V

* = 1.39V

R−Y

In the matrix equations: V demodulator. V

3. Adaptive black control acts on Y signal, which is either Y input or Y output from RGB matrix. Negative set-up is not affected. The level shift value is determined by the peak dark detector, operation selected by control bit ADBL. The peak dark detector is inactive during blanking. Peak dark detector activated by internal line counter, which starts after the end of the vertical blank of the sandcastle. Active from line 16 (after end of vertical sandcastle) to line 224 (NTSC mode, NMEN = 1) or line 272 (PAL mode, NMEN = 0). It is recommended to increase the contrast value (subaddress 02) by 15% if ADBL = 1. The line numbers are doubled if control bit HDTV = 1.

4. Sandcastle pulse detector (pin 14) The sandcastle pulse is compared with 3 (control bit SC5 = 0) or 2 (SC5 = 1) internal threshold levels to separate the various pulses; the internal pulses are generated while the input pulse is higher than the thresholds. The thresholds are independent of supply voltage and temperature.

5. Y output can be switched to hue adjust output via I2C-bus control bit YEXH. Output without sync pulse. Recommendation: Hue adjust DAC set to 3F

6. Output can be switched to Y output via I2C-bus control bit YEXH (via I2C-bus, resolution 6 bit, bus subaddress 03).

7. At minimum gamma (3F

8. Series resistor in supply voltage should be less than 0.3 Ω.

9. At 1.0 V cut-off measurement level the function of the cut-off control loop is not guaranteed because the blanking level is limited to the minimum output voltage. For proper working a guide number for the minimum cut-off measurement level is 1.3 V.

R−Y

− 0.19V

− 0.07V

*, V

G−Y

B−Y

and V

*=−0.46V

are conventional PAL demodulation axes and amplitudes at the output of the

B−Y

* are the NTSC-modified colour-difference signals.

B−Y

B−Y;VG−Y

R−Y

* and V

) any differences in black level steps are amplified by 6 dB.

HEX

− 0.15V

R−Y

. Black level adjustable via hue adjust DAC.

HEX

B−Y

; V

B−Y

*= V

B−Y

May 1994 20

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

APPENDIX

TDA4780

Fig.4 Demodulation axes.

May 1994 21

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic

TDA4780

cut-off control and gamma adjust

I2C-BUS RECEIVER (pins 27 and 28) S: start condition

P: stop condition W: write A: acknowledge

slave address:

A6 A5 A4 A3 A2 A1 A0 10001000

receiver (write mode) slave receiver format is (BREN = 0)

S SLAVE ADDRESS A SUBADDRESS A DATA BYTE A ... DATA BYTE A P

n data bytes with auto-increment of subaddresses

All subaddresses within the range 00 to 0F are automatically incremented. The subaddress counter wraps around from 0F to 00. Only in this case 0F will be acknowledged too. Subaddresses outside the range 00 to 0E are not acknowledged by the device and neither auto-increment nor any other internal operation takes place. All eight bits of the subaddress have to be decoded by the device. If BREN = 1 (control register 1) auto-increment is not possible, the slave receiver format is: S, SLAVE ADDRESS A, SUB ADDRESS A, DATA BYTE A, P

May 1994 22

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic

TDA4780

cut-off control and gamma adjust

Table 1 Signal input selection and effect on adaptive black measurements by fast source switches and I2C-bus.

C-BUS CONTROLLED BITS ANALOG

SWITCH

FSON2 FSDIS2 FSON1 FSDIS1

FSW2

(pin 1)

FSW1

(pin 13)

RGB2 (pins 2, 3

and 4)

LLLLLL active ON

L H active ON H * ON off

LLLHL* active ON

H * ON off

L L H * L * active ON

H * ON off

L H L L * L active ON

* H active ON L H L H * * active ON L H H * * * active ON H L * * L * ON active

HONoff HH****ON active

SELECTED SIGNALS

ADBL

RGB1(pins

10, 11 and 12

TV (pins

6, 7 and 8)

Notes

1. H: logical HIGH or analog switch (pins 1 and 13) to > 0.9 V

2. L: logical LOW or analog switch (pins 1 and 13) to < 0.4 V

3. *: H or L, no influence

4. ON: is the selected signal input

Table 2 Crosstalk

FSW1 FSW2 CROSSTALK at 4 MHz

maximum value (dB)

L L RGB

L H Y, CD → RGB

H H Y, CD → RGB

→ Y, CD −58 −55 −50

RGB

−51 −50 −47

RGB

→ RGB

−58 −55 −50

−51 −50 −47

−58 −55 −50

−51 −50 −47

−58 −55 −50

at 8 MHz maximum value (dB)

at 13 MHz maximum value (dB)

May 1994 23

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic

TDA4780

cut-off control and gamma adjust

Table 3 Subaddress byte and data byte format.

FUNCTION SUBADDRESS DATA BYTE

D7 D6 D5 D4 D3 D2 D1 D0

brightness 00 0 0 A05 A04 A03 A02 A01 A00 saturation 01 0 0 A15 A14 A13 A12 A11 A10 contrast 02 0 0 A25 A24 A23 A22 A21 A20 hue 03 0 0 A35 A34 A33 A32 A31 A30 red gain 04 0 0 A45 A44 A43 A42 A41 A40 green gain 05 0 0 A55 A54 A53 A52 A51 A50 blue gain 06 0 0 A65 A64 A63 A62 A61 A60 red level reference 07 0 0 A75 A74 A73 A72 A71 A70 green level reference 08 0 0 A85 A84 A83 A82 A81 A80 blue level reference 09 0 0 A95 A94 A93 A92 A91 A90 peak drive limit 0A 0 0 AA5 AA4 AA3 AA2 AA1 AA0 gamma 0B 0 0 AB5 AB4 AB3 AB2 AB1 AB0 control register 1 0C SC5 DELOF BREN X NMEN X X X control register 2 0D X HDTV FSBL BCOF FSDIS2 FSON2 FSDIS1 FSON1 control register 3 0E ADBL YHI MOD2 BLST YEXH RELC TCPL 0

The least significant bit of an analog control alignment register is defined as AX0 (D0). After power on reset (PONRES) all alignment registers are set to 01. X means don’t care but for software compatibility with further video ICs with the same slave address, it is recommended to set all X to 0.

May 1994 24

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

Table 4 RGB processor mode bits control register.

SYMBOL PARAMETER CONDITIONS

Control register 1

SC5 sandcastle 5 V 0 = 3-level sandcastle pulse

1 = 2-level sandcastle pulse

DELOF delay of leading edge of

clamping pulse switched off

BREN buffer register enable 0 = new data are executed just after reception

NMEN NTSC - matrix enable 0 = PAL matrix

Control register 2

HDTV HDTV / progressive scan for

ADBL line counter

FSBL full screen black level, e.g. for

optical measurement

BCOF internal black level control off 0 = automatic cut-off control active

FSON2 fast switch 2 on see Table 1 FSDIS1 fast switch 1 disable FSDIS2 fast switch 2 disable FSON1 fast switch 1 on

0 = delay 1 = no delay

1 = data are hold in a latch (buffer register) and will be transferred to their destination register within the next vertical blanking interval; the device does not acknowledge any new data transfer until the internal transfer to the destination register has been completed

1 = NTSC matrix

0 = 272 (PAL), 224 (NTSC) lines 1 = 544 (PAL), 448 (NTSC) lines 0 = normal mode 1 = cut-off measurement level during full ﬁeld brightness, inactive

1 = RGB outputs clamped to ﬁxed DC levels

TDA4780

Control register 3

ADBL adaptive black 0 = off

1 = on

YHI Y high level 0 = input = 0.315 V

1 = input = 1.0 V(

MOD2 modus 2 0 = inactive (BCOF = 0) AND (MOD2 = 1) is senseless; no output

stabilization 1 = output clamp without brightness adjust, brightness remains active

e.g. for blue stretch

BLST blue stretch 0 = off

1 = on

YEXH Y exclusive hue 0 = pin 26 is switched to hue adjust output

1 = pin 26 is switched to Y output

RELC relative to cut-off 0 = peak drive limit to absolute output

1 = peak drive limit relative to cut-off

TCPL time constant peak drive limiter 0 = 2 f

May 1994 25

1 = 1 f

H H

(black-white)

(p-p)

(black-white)

(p-p)

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

handbook, full pagewidth

MSB LSB

module address

Fig.5 The module address byte.

TDA4780

00100

ACKX

R/W

MED696

handbook, full pagewidth

STOSAD

STOP

condition

MED697

START

condition

MADSTA

data byte

Fig.6 Data transmission without auto-increment (BREN = 0 or 1)

SAD

START

condition

MADSTA

data byte

data bytes

STO

STOP

condition

MED698

Fig.7 Data transmission with auto-increment (BREN = 0).

May 1994 26

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

TDA4780

Fig.8 Test and application circuit.

Fig.9 Cut-off measurement pulses

(1) Insert link BR1 if average beam

current limiting is not applied.

may be omitted.

(2) R

May 1994 27

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

Fig.10 Principle of adaptive black control.

TDA4780

Fig.11 Principle of blue stretch.

May 1994 28

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

TDA4780

LM = leakage current measurement time MR, MG, MB = R, G, B cut-off measurement pulses

Fig.12 Leakage and cut-off current measurement timing diagram.

May 1994 29

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

Table 5 internal circuitry (Abbreviations: OB: open base and CL: clamp pulse).

PIN NO.

1 fast switch 2

PIN NAME

(DESCRIPTION)

input clamp 100 µA / OB

WAVE FORM Z INTERNAL CIRCUIT

TDA4780

May 1994 30

input clamp 100 µA / OB

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

PIN NO.

5 supply voltage

6 −(B−Y) input clamp 100 µA / OB

PIN NAME

(DESCRIPTION)

WAVE FORM Z INTERNAL CIRCUIT

TDA4780

7 −(R−Y) input clamp 100 µA / OB

8 Y input clamp 100 µA / OB

May 1994 31

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

PIN NO.

9 ground

10 R

PIN NAME

(DESCRIPTION)

input clamp 100 µA / OB

WAVE FORM Z INTERNAL CIRCUIT

TDA4780

11 G

12 B

May 1994 32

input clamp 100 µA / OB

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

PIN NO.

13 fast switch 1

PIN NAME

(DESCRIPTION)

WAVE FORM Z INTERNAL CIRCUIT

TDA4780

37 kΩ

(SC5 = 0)

14 sandcastle input

15 average beam

current limiting input

storage capacitor

for peak limiting input

OB (SC5 = 1)

outside peak drive OB

during peak drive (RELC = 1) 0 to 12 mA

during peak drive (RELC = 0) 5 mA

May 1994 33

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

PIN NO.

17 storage capacitor

PIN NAME

(DESCRIPTION)

for leakage current

WAVE FORM Z INTERNAL CIRCUIT

outside leakage current measurement

during leakage current measurement to

automatic switch to power on reset 4 mA

TDA4780

−400 µA

+400 µA

18 peak dark storage OB / 0.26 mA

cut-off −180 µA

19 measurement input

(beam current information input)

to +180 µA

May 1994 34

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

PIN NO.

20 blue output

PIN NAME

(DESCRIPTION)

WAVE FORM Z INTERNAL CIRCUIT

TDA4780

5 mA

21 blue cut-off storage

capacitor

during cut-off control or during output clamping

5 mA

−300 µA to +300 µA

May 1994 35

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

PIN NO.

22 green output

PIN NAME

(DESCRIPTION)

WAVE FORM Z INTERNAL CIRCUIT

TDA4780

5 mA

23 green cut-off

storage capacitor

during cut-off control or during output clamping

5 mA

−300 µA to +300 µA

May 1994 36

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

PIN NO.

24 red output

PIN NAME

(DESCRIPTION)

WAVE FORM Z INTERNAL CIRCUIT

TDA4780

5 mA

25 red cut-off storage

capacitor

Y output 0.7 mA

during cut-off control or during output clamping

5 mA

−300 µA to +300 µA

hue adjust output YEXH = 0

DC 0.8 V to 5.0 V 0.7 mA

May 1994 37

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

PIN NO.

PIN NAME

(DESCRIPTION)

I2C-bus data input outside acknowledge OB

acknowledge output during acknowledge

WAVE FORM Z INTERNAL CIRCUIT

TDA4780

less than

0.1 V up to 4 mA due to external pull-up resistor

28 I

C-bus serial clock

input

May 1994 38

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

PACKAGE OUTLINE

handbook, full pagewidth

DIP28: plastic dual in-line package; 28 leads (600 mil)

seating plane

TDA4780

SOT117-1

w M

(e )

pin 1 index

0 5 10 mm

scale

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

UNIT

inches

Note

1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.

max.

1 2

min.

max.

1.7

1.3

0.066

0.051

0.53

0.38

0.020

0.014

cD E weM

0.32

0.23

0.013

0.009

(1) (1)

36.0

35.0

1.41

1.34

14.1

13.7

0.56

0.54

(1)

3.9

3.4

15.80

15.24

0.62

0.60

17.15

15.90

0.68

0.63

0.252.54 15.24

0.010.10 0.60

0.15

0.13

max.

1.75.1 0.51 4.0

0.0670.20 0.020 0.16

OUTLINE

VERSION

SOT117-1

IEC JEDEC EIAJ

051G05 MO-015AH

REFERENCES

May 1994 39

EUROPEAN

PROJECTION

ISSUE DATE

92-11-17 95-01-14

Philips Semiconductors Preliminary speciﬁcation

RGB video processor with automatic cut-off control and gamma adjust

SOLDERING Introduction

There is no soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. However, wave soldering is not always suitable for surface mounted ICs, or for printed-circuits with high population densities. In these situations reflow soldering is often used.

This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in

“IC Package Databook”

our

Soldering by dipping or by wave

The maximum permissible temperature of the solder is 260 °C; solder at this temperature must not be in contact

DEFINITIONS

(order code 9398 652 90011).

TDA4780

with the joint for more than 5 seconds. The total contact time of successive solder waves must not exceed 5 seconds.

The device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified maximum storage temperature (T printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit.

Repairing soldered joints

Apply a low voltage soldering iron (less than 24 V) to the lead(s) of the package, below the seating plane or not more than 2 mm above it. If the temperature of the soldering iron bit is less than 300 °C it may remain in contact for up to 10 seconds. If the bit temperature is between 300 and 400 °C, contact may be up to 5 seconds.

stg max

). If the

Data sheet status

Objective speciﬁcation This data sheet contains target or goal speciﬁcations for product development. Preliminary speciﬁcation This data sheet contains preliminary data; supplementary data may be published later. Product speciﬁcation This data sheet contains ﬁnal product speciﬁcations.

Limiting values

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the speciﬁcation is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information

Where application information is given, it is advisory and does not form part of the speciﬁcation.

LIFE SUPPORT APPLICATIONS

These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale.

PURCHASE OF PHILIPS I

C COMPONENTS

Purchase of Philips I components in the I2C system provided the system conforms to the I2C specification defined by Philips. This specification can be ordered using the code 9398 393 40011.

May 1994 40

C components conveys a license under the Philips’ I2C patent to use the

Datasheet Tda4780 Datasheet (Philips)

Specifications and Main Features

Frequently Asked Questions

User Manual