Datasheet TDA4780-V4 Datasheet (Philips)

DATA SHEET

Preliminary specification
Supersedes data of May 1994
File under Integrated Circuits, IC02

1997 Feb 06

INTEGRATED CIRCUITS

TDA4780

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

1997 Feb 06 2

Philips Semiconductors Preliminary specification

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

TDA4780

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 I

2

C-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

• White point adjusts via I2C-bus

• Average beam current and improved peak drive limiting

• Two switch-on delays to prevent discoloration 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.

The required input signals are:

• Luminance and negative colour difference signals

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

generation

• I

2

C-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 with 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) with the
TDA4680. The I2C-bus slave address can be used for
both ICs. When a function of the TDA4780 is not
included in the TDA4680, the I2C-bus command is not
executed. Special commands (except control bit FSWL)
for the TDA4680 will be ignored by the TDA4780.

1997 Feb 06 3

Philips Semiconductors Preliminary specification

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

TDA4780

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

V

P

supply voltage (pin 5) 7.2 8.0 8.8 V

I

P

supply current (pin 5) 80 100 120 mA

V

8(p-p)

luminance input (peak-to-peak value) (C)VBS − 0.45/1.43 − V

V

6(p-p)

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

V

7(p-p)

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

V

14

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

V

i

RGB input signals at pins 2, 3, 4, 10, 11 and 12 (black-to-white value) − 0.7 − V

V

o(p-p)

RGB output at pins 24, 22 and 20 (black-to-white value) − 2.0 − V

T

amb

operating ambient temperature −20 − +70 °C

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TDA4780 DIP28 plastic dual in-line package; 28 leads (600 mil) SOT117-1

1997 Feb 06 4

Philips Semiconductors Preliminary specification

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

TDA4780

BLOCK DIAGRAM

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

handbook, full pagewidth

j

i

h

g

e

f

d

c

b

a

MGE875

200 µF

1 µF

CLAMP

TDA4780

CLAMP

CLAMP

0.45 V

1.43 V

PAL / SECAM

NTSC

MATRIX

INPUT

SELECTOR

FSON1

FSON2

FSDIS1

FSDIS2

Y - MATRIX

COLOUR

DIFFERENCE

MATRIX

ADAPTIVE

BLACK

Y

Y

Y

BL

GAMMA

Y

gamma

BL

SATURATION

ADJUST

HUE

ADJUST

BANDGAP

REFERENCE

SUPPLY

CONTROL REGISTERS

TCPL

RELC

BCOF

YEXHHDTV

FSBL

DELOF

SC5

YHI

REGISTERS

DIGITAL TO ANALOG CONVERTERS

I2C-BUS

RECEIVER

SANDCASTLE

DETECTOR

8 DATA

BREN

V

SC5

DELOF

B

G

R

CL
HV
(H)

NMEN

10
11
12

R

1

G

1

B

1

R

2

G

2

B

2

2
3
4

6
7
8

−(B − Y)

−(B − Y)

−(R − Y)

−(R − Y)

Y

Y

47 nF

10 nF

10 nF

10 nF

10 nF

10 nF

10 nF

10 nF

10 nF

13

FSW

1

FSW

2

FSW

1

FSW

2

1

18 26

C

PDST

YHUE

GND

9

5

V

P

U

GAP

14
SC

27

28
SCL

SDA

R

1

G

1

B

1

R

2

G

2

B

2

ADBL

R − Y
G − Y
B − Y

R
G
B

R
G
B

Y

YEXH

U

GAP

sandcastle input

I

2

C-bus

VP = 8 V

Y - output /
hue adjust

output

peak dark

storage

6 DATA

1997 Feb 06 5

Philips Semiconductors Preliminary specification

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

TDA4780

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

handbook, full pagewidth

j

i

h

g

e

f

d

c

b

a

MGE876

82 kΩ

1 µF

TDA4780

CONTRAST

ADJUST

BRIGHTNESS

ADJUST

REGISTERS

DIGITAL ANALOG CONVERTERS

TIMING

GENERATOR

B

G

R

B

B

B

G

R

FSBL

NMEN

HDTV

BLANK

MP

CL
HV
(H)

WHITE
POINT

ADJUST

MP

BLANK

WHITE
POINT

ADJUST

MP

BLANK

WHITE
POINT

ADJUST

MP

BLANK

BLUE

STRETCH

VOLTAGE

COMPARATOR

VOLTAGE

COMPARATOR

MINIMUM

DETECTOR

PEAK DRIVE

LIMITER

CUT-OFF RELATED

PEAK DRIVE

LIMITER

ABSOLUTE LEVEL

TCPL RELC

RELC

AVERAGE

BEAM

CURRENT

LIMITING

R

G

B

OUTPUT
BUFFER

OUTPUT
BUFFER

OUTPUT
BUFFER

1st AND 2nd
SWITCH-ON

DELAY

CUT-OFF

CONTROL

LEAKAGE
CURRENT

COMPARATOR

OUTPUT

CLAMP

BCL
15 16

C

PDL

24

22

20

R

O

G

O

B

O

19

CI

U

GAP

U

GAP

BCOF

BCOF

25

23

21

C

R

C

G

C

B

17
C

L

MOD2

220 nF

330 nF

220 nF 220 nF

cut-off storageleakage storage

leakage and
cut - off
current input

RGB
outputs
to
video
amplifiers

peak drive

limiting storage

average beam
current limiting

input

1997 Feb 06 6

Philips Semiconductors Preliminary specification

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

TDA4780

PINNING

SYMBOL PIN DESCRIPTION

FSW

2

1 fast switch 2 input

R

2

2 red input 2

G

2

3 green input 2

B

2

4 blue input 2

V

P

5 supply voltage

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

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

Y 8 luminance input
GND 9 ground
R

1

10 red input 1

G

1

11 green input 1

B

1

12 blue input 1

FSW

1

13 fast switch 1 input
SC 14 sandcastle pulse input
BCL 15 average beam current limiting input
C

PDL

16 storage capacitor for peak limiting
C

L

17 storage capacitor for leakage current compensation
C

PDST

18 storage capacitor for peak dark
CI 19 cut-off measurement input
B

O

20 blue output
C

B

21 blue cut-off storage capacitor
G

O

22 green output
C

G

23 green cut-off storage capacitor
R

O

24 red output
C

R

25 red cut-off storage capacitor
YHUE 26 Y-output/hue adjust output
SDA 27 I

2

C-bus serial data input/acknowledge output

SCL 28 I

2

C-bus serial clock input

Fig.3 Pin configuration.

page

FSW

2

R

2

G

2

B

2

V

P

−(B − Y)

−(R − Y)

Y

GND

R

1

G

1

B

1

FSW

1

SC

SCL
SDA
YHUE
C

R

C

G

G

O

R

O

C

B

B

O

CI
C

PDST

C

L

C

PDL

BCL

1
2
3
4
5
6
7
8

9
10
11
12
13

28
27
26
25
24
23
22
21
20
19
18
17
16
1514

TDA4780

MGE874

1997 Feb 06 7

Philips Semiconductors Preliminary specification

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

TDA4780

FUNCTIONAL DESCRIPTION
Signal input stages

The TDA4780 contains 3 sets of input signal stages for:

1. Luminance/colour-difference signals:
a) Y: 0.45 V (p-p) VBS or 1.43 V (p-p) VBS,

selectable via I

2

C-bus.
b) −(R − Y): 1.05 V (p-p).
c) −(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).

2. (RGB)1signals (0.7 V (p-p) VB), capacitively coupled
(e.g. from external source).

3. (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

2

C-bus. With the
pin FSW1 the Y-CD signals or the (RGB)1signals can be
selected, with pin FSW2 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, contrast and brightness adjust

Saturation, contrast and brightness adjusts are controlled
via the I

2

C-bus and act on Y, CD as well as on RGB input
signals. Gamma acts on the luminance content of the input
signals.

Gamma adjust

The gamma adjust stage has a non-linear transmission
characteristic according to the formula y = x

gamma

, where 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.

Blue stretch (BLST)

The blue stretch channel gets additional amplification if the
blue signal is greater than 80% of the nominal signal
amplitude. In the event 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

H

(32 kHz) application.

Output amplifier and white adjust potentiometer

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

2

C-bus (individually for

RGB respect).

1997 Feb 06 8

Philips Semiconductors Preliminary specification

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

TDA4780

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 I2C-bus for each colour
channel. The control voltages that are derived in this way
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
I

2

C-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

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
limiting, that is activated if one of the RGB signals even
shortly exceeds a via I

2

C-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. In the event of output
clamping, the cut-off control is disabled and the switch on
procedure will be skipped.

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 the fast switch.

I

2

C-bus

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

ESD protection

The Pins are provided with protection diodes against
ground and supply voltage (see Chapter “Internal pin
configurations”). I

2

C-bus input pins do not shunt the

I2C-bus signals in the event of missing supply voltage.

EMC

The pins are protected against electromagnetic radiation.

1997 Feb 06 9

Philips Semiconductors Preliminary specification

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

TDA4780

I2C-BUS RECEIVER
Table 1 Slave address; note 1

Note

1. Explanation for the cell contents of the table:

a) W means write.

Table 2 Slave receiver format (write mode; BREN = 0); note 1

Notes

1. Explanation for the cell contents of the table:

a) S means START condition.
b) P means STOP condition.
c) A means acknowledge.

2. All subaddresses within the range 00H to 0FH are automatically incremented. The subaddress counter wraps around

from 0FH to 00H. Only in this event 0FH will be acknowledged.
Subaddresses outside the range 00H to 0EH 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.

Table 3 Slave receiver format (write mode; BREN = 1); note 1

Notes

1. Explanation for the cell contents of the table:

a) S means START condition.
b) P means STOP condition.
c) A means acknowledge.

2. Auto-increment is not possible.

A6 A5 A4 A3 A2 A1 A0

W

10001000

S SLAVE ADDRESS A SUBADDRESS

(2)

A DATA BYTE

n data bytes with auto-increment of subaddresses

AP

S SLAVE ADDRESS A SUBADDRESS A DATA BYTE

(2)

AP

1997 Feb 06 10

Philips Semiconductors Preliminary specification

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

TDA4780

Fig.4 The module address byte.

handbook, full pagewidth

ACKX

R/W

00100

module address

01

MSB LSB

MED696

handbook, full pagewidth

STOSAD

START

condition

data byte

STOP

condition

MADSTA

MED697

Fig.5 Data transmission without auto-increment (BREN = 0 or 1).

handbook, full pagewidth

SAD

START

condition

data byte

STOP

condition

MADSTA

MED698

STO

data bytes

Fig.6 Data transmission with auto-increment (BREN = 0)

1997 Feb 06 11

Philips Semiconductors Preliminary specification

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

TDA4780

Table 4 Signal input selection and effect on adaptive black measurements by fast source switches and I2C-bus;

note 1

Note

1. Explanation for the cell contents of the table:

a) H = set to logic 1 or analog switch (pins 1 and 13) to >0.9 V.
b) L = set to logic 0 or analog switch (pins 1 and 13) to <0.4 V.
c) X = don’t care.
d) ON = this signal is selected.

I

2

C-BUS CONTROLLED BITS ANALOG SWITCH SELECTED SIGNALS

FSON2 FSDIS2 FSON1 FSDIS1

FSW2

(pin 1)

FSW1

(pin 13)

RGB

2

(pins 2, 3

and 4)

ADBL

RGB1 (pins 10,

11 and 12)

TV (pins 6,

7 and 8)

LLLLL L active ON

L H active ON
H X ON inactive

LLLHL X active ON

H X ON inactive

L L H X L X active ON

H X ON inactive

L H L L X L active ON

X H active ON
L H L H X X active ON
L H H X X X active ON
H L X X L X ON active

H ON inactive
H H X X X X ON active

1997 Feb 06 12

Philips Semiconductors Preliminary specification

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

TDA4780

Table 5 Crosstalk; note 1

Note

1. Explanation for the cell contents of the table:
a) H = set to logic 1.
b) L = set to logic 0.

Table 6 Subaddress byte and data byte format; notes 1 and 2

Notes

1. Explanation for the cell contents of the table:
a) L = set to logic 0.
b) X means don’t care but for software compatibility with further video ICs with the same slave address, it is

recommended to set all these bits to logic 0.

2. After power on reset all alignment registers are set to 01H.

3. The least significant bit of the analog alignment register.

FSW1 FSW2 CROSSTALK

AT 4 MHz MAXIMUM

VALUE (dB)

AT 8 MHz MAXIMUM

VALUE (dB)

AT 13 MHz MAXIMUM

VALUE (dB)

L L RGB

1

→ Y, CD −58 −55 −50

RGB

2

→ Y, CD −58 −55 −50

L H Y, CD → RGB

1

−51 −50 −47

RGB

2

→ RGB

1

−58 −55 −50

L H Y, CD → RGB

2

−51 −50 −47

RGB

1

→ RGB

2

−58 −55 −50

H H Y, CD → RGB

2

−51 −50 −47

RGB

1

→ RGB

2

−58 −55 −50

FUNCTION SUBADDRESS

DATA BYTE

D7 D6 D5 D4 D3 D2 D1 D0

(3)

Brightness 00H L L A05 A04 A03 A02 A01 A00
Saturation 01H L L A15 A14 A13 A12 A11 A10
Contrast 02H L L A25 A24 A23 A22 A21 A20
Hue 03H L L A35 A34 A33 A32 A31 A30
Red gain 04H L L A45 A44 A43 A42 A41 A40
Green gain 05H L L A55 A54 A53 A52 A51 A50
Blue gain 06H L L A65 A64 A63 A62 A61 A60
Red level reference 07H L L A75 A74 A73 A72 A71 A70
Green level reference 08H L L A85 A84 A83 A82 A81 A80
Blue level reference 09H L L A95 A94 A93 A92 A91 A90
Peak drive limit 0AH L L AA5 AA4 AA3 AA2 AA1 AA0
Gamma 0BH L L AB5 AB4 AB3 AB2 AB1 AB0
Control register 1 0CH SC5 DELOF BREN X NMEN X X X
Control register 2 0DH X HDTV FSBL BCOF FSDIS2 FSON2 FSDIS1 FSON1
Control register 3 0EH ADBL YHI MOD2 BLST YEXH RELC TCPL L

1997 Feb 06 13

Philips Semiconductors Preliminary specification

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

TDA4780

Table 7 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

0 = delay
1 = no delay

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

1 = data is held 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

NMEN NTSC matrix enable; note 1 0 = PAL matrix

1 = NTSC matrix; hue position set on −2 degrees

Control register 2

HDTV HDTV / progressive scan for

ADBL line counter

0 = 272 (PAL), 224 (NTSC) lines
1 = 544 (PAL), 448 (NTSC) lines

FSBL full screen black level, e.g. for

optical measurement

0 = normal mode
1 = cut-off measurement level during full field, brightness inactive

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

1 = RGB outputs clamped to fixed DC levels
FSON2 fast switch 2 on see Table 4
FSDIS1 fast switch 1 disable
FSDIS2 fast switch 2 disable
FSON1 fast switch 1 on

Control register 3

ADBL adaptive black 0 = off

1=on
YHI Y high level 0 = input = 0.315 V (p-p) (black-white)

1 = input = 1.0 V (p-p) (black-white)
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 = 2f

H

1=1f

H

1997 Feb 06 14

Philips Semiconductors Preliminary specification

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

TDA4780

Note

1. Matrix coefficients should be tested by comparing RGB output signals with a reference RGB colour bar, which is fed
in at (RGB)1 or (RGB)2 inputs. In the event 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

G −Y

= −0.51V

R − Y

− 0.19V

B − Y

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

R − Y*

= 1.39V

R − Y

− 0.07V

B − Y

; V

G − Y*

= −0.46V

R − Y

− 0.15V

B − Y

; V

B − Y*=VB−Y

For demodulation axis see Fig.11.
In the matrix equations: V

R − Y

and V

B − Y

are conventional PAL demodulation axes and amplitudes at the output of

the demodulator. V

R − Y*

, V

G − Y*

and V

B − Y*

are the NTSC-modified colour-difference signals.

Fig.7 Cut-off measurement pulses.

handbook, full pagewidth

MGE878

maximum brightness
nominal brightness

ultra-black

cut-off measurement line
for green signal

1997 Feb 06 15

Philips Semiconductors Preliminary specification

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

TDA4780

Fig.8 Principle of adaptive black control.

handbook, full pagewidth

MGE879

adaptive black level controlinput signal

nominal white
level

nominal black
level

Fig.9 Principle of blue stretch.

handbook, full pagewidth

MGE880

R

G

B

1997 Feb 06 16

Philips Semiconductors Preliminary specification

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

TDA4780

handbook, full pagewidth

MGE881

LM

sandcastle pulse with vertical component
timing controlled by sandcastle pulse

R channel

G channel

B channel

MR

MG

MB

LM

LM

MT

DG

Fig.10 Pulse diagram.

LM = leakage current measurement time.
MR, MG, MB = R, G, B cut-off measurement pulses.
MT = measurement time.
DG = internal blanking.

Fig.11 Demodulation axes.

handbook, full pagewidth

MGE877

V-axis

V-axis

U-axis

(B − Y)

2.03 / 0˚

U-axis

(B − Y)

2.03 / 0˚

(R − Y)

1.14 / 90˚

(G − Y)

0.698 / 236.4˚

(R − Y)

1.59 / 95.1˚

(G − Y)

0.606 / 239.9˚

PAL

NTSC-JAPAN
nominal hue = −2˚

1997 Feb 06 17

Philips Semiconductors Preliminary specification

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

TDA4780

LIMITING VALUES

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

Note

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

THERMAL CHARACTERISTICS

QUALITY SPECIFICATION

In accordance with URV-4-2-59/601. The number of the quality specification can be found in the

“Quality Reference

Handbook

”. The handbook can be ordered using the code 9397 750 00192.

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

P

supply voltage −0.1 +9.0 V

V

10, 11, 12

(RGB)1 inputs with respect to GND −0.1 V

P

V

V

2, 3, 4

(RGB)2 inputs with respect to GND −0.1 V

P

V

V

8, 7, 6

Y, CD-inputs with respect to GND −0.1 V

P

V

V

13, 1

switch 1 and switch 2 input voltage with respect to GND −0.1 V

P

V

V

25, 23, 21, 17

black level, leakage storage with respect to GND −0.1 V

P

V

V

14

sandcastle with respect to GND −0.7 VP+ 5.8 V

V

15

average current information with respect to GND −0.7 VP+ 0.7 V

V

16

peak drive storage with respect to GND −0.1 V

P

V

V

18

peak dark storage with respect to GND −0.1 V

P

V

V

19

cut-off control input voltage with respect to GND −0.7 VP+ 0.7 V

V

27, 28

I2C-bus: SDA and SCL voltage with respect to GND −0.1 V

P

V

I

24, 22, 20

output peak current −20 − mA

I

24, 22, 20

output average current −10 − mA

I

26

Y output/hue adjust current −8 − mA

P

tot

total power dissipation − 1200 mW

T

amb

operating ambient temperature −20 +70 °C

T

stg

storage temperature −20 +150 °C

V

es

electrostatic handling; note 1 −500 +500 V

SYMBOL PARAMETER VALUE UNIT

R

th j-a

thermal resistance from junction to ambient in free air 47 K/W

1997 Feb 06 18

Philips Semiconductors Preliminary specification

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

TDA4780

CHARACTERISTICS

V

P

=8V; T

amb

= +25 °C; V

nom

: nominal signal amplitude (black-white) 2 000 mV (peak-to-peak value) at output pins;
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

V

P

supply voltage (pin 5) 7.2 8 8.8 V

I

P

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)

V

6(p-p)

−(B − Y) signal (peak-to-peak value) 75% colour bar signal − 1.33 − V

V

6, 7

internal bias during clamping − 4.0 − V

I

6, 7

DC input current between clamping
pulses

−− 0.1 µA

I

6, 7

maximum input current during clamping 100 180 260 µA

V

7(p-p)

−(R − Y) signal (peak-to-peak value) 75% colour bar signal − 1.05 − V

R

6, 7

AC input resistance 10.0 −−MΩ

Y input (pin 8; capacitively coupled to a low-ohmic source; recommendation: maximum 600 Ω)

V

8(p-p)

input signal (composite signal; VBS;
peak-to-peak value)

adaption to two
different signal levels
via control bit YHI

YHI = 0 − 0.45 − V

YHI = 1 − 1.43 − V

R

8

AC input resistance 10.0 −−MΩ

V

8

internal bias during clamping YHI = 0 − 3.7 − V

YHI = 1 − 4.6 − V

I

8

DC input current between clamping
pulses

−− 0.1 µA

I

8(max)(clamp)

maximum input current during clamping 100 180 260 µA

RGB input 1 (R

1

: 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(p-p)

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

R

10, 11, 12

AC input resistance 10.0 −−MΩ

V

10, 11, 12

internal bias during clamping − 5.1 − V

I

10, 11, 12

DC input current between clamping
pulses

−− 0.1 µA

I

10, 11, 12(clamp)

maximum input current during clamping 100 180 260 µA

1997 Feb 06 19

Philips Semiconductors Preliminary specification

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

TDA4780

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(p-p)

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

R

2, 3, 4

AC input resistance 10.0 −−MΩ

V

2, 3, 4

internal bias during clamping − 5.1 − V

I

2, 3, 4

DC input current between clamping
pulses

−− 0.1 µA

I

2, 3, 4(max)(clamp)

maximum input current during clamping 100 180 260 µA

Fast signal switches and blanking (fast signal switch 1 (pin 13); Y, CD / R

1

, G1, B1; control bits FSDIS1,

FSON1)

V

13

voltage to select Y and CD − 0 0.4 V

V

13

voltage range to select R1, G1 and B

1

0.9 1.0 5.5 V

R

13

internal resistor to ground 3.3 3.8 4.8 kΩ
CROSSTALK (SEE TABLE 5)
t

s

− t

i

difference between transit times for

signal switching and signal insertion

−− 10 ns

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

1

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

V

1

voltage to select Y and CD / R1, G1 and

B

1

− 0 0.4 V

V

1

voltage range to select R2, G2 and B

2

0.9 1.0 5.5 V

V

1

required minimal voltage to switch off the

ADBL measurement

− 0.87 1.0 V

R

1

internal resistor to ground R1>R

13

2.8 4.2 6.0 kΩ
CROSSTALK (SEE TABLE 5)
t

s

− t

i

difference between transit times for
signal switching and signal insertion

−− 10 ns

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

A

DAPTIVE BLACK (DETECTORS INACTIVE STATUS DUE TO ACTION OF FAST SWITCH 2(PIN 1); see Table 4, Fig.9 and note 2)

I

18(dch)

discharge current of peak dark storage
capacitor

outside active
measurement window

−1.0 0.0 +1.0 µA

inside active
measurement window

1.5 2.5 3.5 µA

I

18(ch)

charge current of peak dark storage
capacitor

−360 −300 −250 µA

d

bl(max)

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

10 13 16 %

d

bl(nom)

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

−3 0 +3 %

t

dibb

detectors inactive time before blanking 2.3 3.1 4.0 µs

t

diab

detectors inactive time after blanking 2.3 2.5 3.4 µs

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

1997 Feb 06 20

Philips Semiconductors Preliminary specification

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

TDA4780

GAMMA ADJUST (ACTS ON INTERNAL Y SIGNAL;YMATRIX SEE Y OUTPUT;I2C-BUS CONTROLLED POTENTIOMETER
(SUBADDRESS 0BH); RESOLUTION 6 BIT; note 3)

d

g

range of gamma

minimum (3FH) − 0.7 −−
maximum (00H) − 1.0 −−

G

max

maximum gain at minimum gamma near nominal black 5 6 7 dB

SATURATION ADJUST (ACTS ON RGB SIGNALS;YMATRIX SEE Y OUTPUT;I2C-BUS CONTROLLED POTENTIOMETERS
(SUBADDRESS 01H); RESOLUTION 1.5% OF MAXIMUM SATURATION)

d

s(max)

maximum saturation I2C-bus data 3FH;

measured at 100 kHz;
relative to nominal
saturation; note 4

4.7 5.2 5.8 dB

d

s(min)

minimum saturation I2C-bus data 00H;

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

−− −50 dB

CONTRAST ADJUST (ACTS ON RGB SIGNALS;I2C-BUS CONTROLLED POTENTIOMETERS (SUBADDRESS 02H); RESOLUTION

1.5% OF MAXIMUM CONTRAST)
d

c(max)

maximum contrast I2C-bus data 3FH;

limiters inactive;
relative to nominal
contrast; note 5

− 4.5 5.5 dB

d

c(min)

minimum contrast I2C-bus data 00H;

relative to maximum
contrast

−28 −22 −16 dB

BRIGHTNESS ADJUST (ACTS ON RGB SIGNALS;I2C-BUS CONTROLLED POTENTIOMETERS (SUBADDRESS 00H); RESOLUTION

1.5% OF RANGE; ∆ BLACK LEVEL IN PERCENT OF NOMINAL SIGNAL AMPLITUDE REFERRED TO CUT-OFF MEASURING LEVEL)
d

br(max)

maximum brightness: ∆ black level I2C-bus data 3FH 23 30 37 %

d

br(nom)

nominal brightness: ∆ black level I2C-bus data 29H −7 0 +7 %

d

br(min)

minimum brightness: ∆ black level I2C-bus data 00H −58 −50 −42 %

d

br(max)

maximum brightness: ∆ black level I2C-bus data 3FH;

control bits BCOF = 1
and MOD2 = 0

23 30 37 %

d

br(min)

minimum brightness: ∆ black level I2C-bus data 00H;

control bits BCOF = 1
and MOD2 = 0

−58 −50 −42 %

BLUE STRETCH (BLUE STRETCH IS ACTIVATED BY I2C-BUS CONTROL BIT BLST = 1; see Fig.9)
G

bs

increase of small signal gain 100% of nominal signal

amplitude and at 1 MHz

15 20 25 %

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

1997 Feb 06 21

Philips Semiconductors Preliminary specification

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

TDA4780

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)
∆V/V

nom

static deviation note 6; ripple on pin 5

during clamping ≤1mV;
note 7

−1.0 − +1.0 %

at nominal saturation −0.5 − +0.5 %

RGB outputs (output for positive RGB signals (R: pin 24, G: pin 2, B: pin 20); following data without external
load)

R

24, 22, 20

differential output resistance − 25 30 Ω

I

24, 22, 20(max)

maximum output current 4.0 5.0 − mA

V

24, 22, 20(min)

minimum output voltage note 8 −− 0.8 V

V

24, 22, 20(max)

maximum output voltage RL≥ 2kΩ 6.3 7.0 − V

V

24, 22, 20(max)(p-p)

maximum signal amplitude (black-white)
due to internal limits
(peak-to-peak value)

3.3 −−V

V

24, 22, 20(max)(p-p)

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

at nominal white adjust,
contrast and saturation
setting; gamma = 1;
nominal input signals

1.7 2.0 2.3 V

V

24, 22, 20

cut-off measurement level note8 1.0 − 5.0 V

V

24, 22, 20

recommended cut-off measurement
level

− 3.0 − V

OUTPUT CLAMPING (RGB)
V

20, 22, 24

clamp voltage black level control bit BCOF = 1 2.3 2.5 2.7 V
WHITE POTENTIOMETERS
∆G

v(inc)(max)

maximum increase of AC gain I2C-bus data 3FH;

relative to nominal
setting; note 9

40 50 60 %

∆G

v(dec)(max)

maximum decrease of AC gain I2C-bus data 00H;

relative to nominal
setting; note 9

40 50 60 %

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

1997 Feb 06 22

Philips Semiconductors Preliminary specification

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

TDA4780

OVERALL WHITE POINT DEVIATION
∆V/V

nom

note 10 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

nom24

,

V

nom22

, V

nom20

) over the
whole saturation range
at nominal contrast,
brightness and nominal
input signals; ripple on
pin 5 during clamping

≤1 mV; note 7

−2.0 − +2.0 %

Frequency behaviour

B

ETWEEN THE Y INPUT (PIN 8) AND THE RGB OUTPUTS (PINS 24, 22 AND 20)

∆G decrease in gain 1 MΩ and 20 pF load at

13 MHz

−− 3dB

B

ETWEEN THE COLOUR-DIFFERENCE INPUTS (PINS 7 AND 6) AND THE CORRESPONDING R AND B OUTPUTS (PINS 24 AND 20)

∆G decrease in gain at 13 MHz −− 3dB
B

ETWEEN THE (RGB)

1, 2

INPUTS (PINS 10, 11 AND 12 OR 2, 3 AND 4) AND THE RGB OUTPUTS (PINS 24, 22 AND 20)

∆G decrease in gain at 22 MHz −− 3dB
Sandcastle input (pin 14; control bit SC5); note 11
I

14

input current V14< 0.5 V −100 −−µA

C

14-9

input capacitance −− 10 pF

V

14

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

P

+

5.8

V

for burst key pulses and line count SC5 = 1 4.0 − V

P

+

5.8

V

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

1997 Feb 06 23

Philips Semiconductors Preliminary specification

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

TDA4780

CLAMP PULSE DELAY
T

d(clamp)

delay of leading edge of clamping pulse nominal sandcastle

pulse

DELOF = 0 1.2 1.5 1.8 µs
DELOF = 1 − 0 −µs

R

EQUIRED MINIMAL BURST GATE PULSE WIDTH

t

W

DELOF = 0 line frequency: 16 kHz 3 −−µs

DELOF = 1 line frequency: 32 kHz 1.5 −−µs
Generation of measurement lines and blanking; note 12
∆V/V

nom

∆V = VCL − VUB

difference between ultra black level

(VUB) and measurement level (VCL) in

percent of nominal signal amplitude

no clipping;
independent of white
point adjust

25 35 45 %

WARM UP TEST PULSE DURING MT (see pulse diagram Fig.10)
V

WU

warm up level VWU=VPL− 1V;

VPL= peak drive level
(see also signal
limiting); given by
I2C-bus; subaddress
0AH; no warm up test
pulse in the event of
output clamping
(BCOF = 1)

−− −−

V

WU(max)

maximum warm up level I2C-bus data 3FH;

RELC = 0

6.3 6.6 6.9 V

V

WU(fixed)

fixed warm up level RELC = 1 5.0 5.2 5.4 V
THRESHOLD FOR POWER ON RESET (POR) DURING TIME DG (see pulse diagram Fig.10)
V

20, 22, 24(POR)

output voltage to cause POR RELC = 0 − V

PL

− V

RELC = 1 − 5.7 − V
Y output (pin 26; note 13)
V

26(nom)(p-p)

nominal signal amplitude (black-white;
independent of gamma, adaptive black,
saturation, contrast and brightness;
peak-to-peak value)

control bit YEXH = 1;

hue DAC (subaddress

03H) set to >28H

0.85 1.0 1.15 V

V

26

black level YEXH = 1; I2C-bus

data 3FH

− 4.0 − V

YEXH = 1; I

2

C-bus

data 20H

− 2.0 − V

a

r

Y matrix coefficients Y = arR+agG+abB 0.27 0.30 0.33

a

g

Y matrix coefficients Y = arR+agG+abB 0.53 0.59 0.65

a

b

Y matrix coefficients Y = arR+agG+abB 0.10 0.11 0.12

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

1997 Feb 06 24

Philips Semiconductors Preliminary specification

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

TDA4780

R

26

differential output resistance − 190 230 Ω

∆τ

26

group delay time between RGB outputs

and Y output

20 25 30 ns

f

g

3 dB bandwidth 11 15 − MHz

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

V

19

permissible voltage (also during
scanning period)

−− V

P

−

1.4

V

V

REF0

internally controlled voltage on pin 19 during leakage

measurement time LM

2.4 2.7 3.0 V

I

o19(max)

maximum output current −350 −−250 µA

I

i19(max)

maximum input current 250 − 350 µA

R

19

input resistance for measurement input 1 −−MΩ

I

19

additional input current only during warm up − 0.5 − mA

V

19

threshold of warm up detector (active in
line MG)

4.3 4.5 4.7 V

V

MEAS

difference between input voltage for
cut-off and V

REF0

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

−− −−

maximum V

MEAS

I2C-bus data 3FH 1.45 1.6 1.75 V

nominal V

MEAS

I2C-bus data 20H 0.9 1.0 1.1 V

minimum V

MEAS

I2C-bus data 00H 0.4 0.45 0.5 V

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

I

25, 23, 21

input currents of storage inputs outside
of the measurement time

−− 0.1 µA

I

25, 23, 21(max)

 maximum charge / discharge current

during measurement time

0.2 0.3 0.4 mA

G

stg

gain from storage pins 25, 23 and 21 to
outputs

− 1.7 −−

Storage of leakage information (pin 17)

I

17

maximum charge / discharge current at
time LM

300 400 −µA

I

17

discharge current peak limiting during time

MK active

− 4 − mA

I

17

leakage current outside time LM −− 0.1 µA

V

17

voltage to reset IC to switch on
conditions

V17 is below 2.3 2.5 3.0 V

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

1997 Feb 06 25

Philips Semiconductors Preliminary specification

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

TDA4780

Signal limiting (the limitation acts on contrast and at low contrast on brightness)

AVERAGE BEAM CURRENT LIMITING (PIN 15)
V

15

start of contrast reduction − 4 − V

∆V

15

input range for full contrast reduction −−2−V

V

15

start of brightness reduction − 2.5 − V

∆V

15

input range for full brightness reduction −−1.6 − V

I

15

input current −− −0.5 µA

PEAK SIGNAL LIMITING OF OUTPUT SIGNALS (PIN 16; THE LIMITATION ACTS 1H DELAYED; LIMITING LEVEL ADJUSTABLE BY
I2C-BUS (SUBADDRESS 0AH; CONTROL BIT RELC = 0))

V

24, 22, 20(max)

maximum limiting level extrapolated from 2FH 6.8 − 7.2 V

V

24, 22, 20(min)

minimum limiting level I2C-bus data 00H − 2.3 3 V

I

16(max)

maximum discharge current at peak
drive

RELC = 0 4 − 6mA

PEAK SIGNAL LIMITING (PIN 16; CONTROL BIT RELC = 1; LIMITING LEVEL (V

LIL

) ADJUSTABLE BY I2C-BUS (SUBADDRESS 0AH))

V

LiL

equal gain in white point
adjust; signal only in
one output channel;
peak drive limiting
starts, if the maximum
of the RGB signals
after white point
adjustment exceeds a
threshold

maximum limiting level I

2

C-bus data 3FH 3.2 3.5 4.0 V

minimum limiting level I

2

C-bus data 00H 1.2 1.5 1.8 V
DISCHARGE CURRENTS (CUT-OFF MEASUREMENT LEVEL MX = MR OR MB OR MG)
I

16(tot)(dch)

total discharge current I16=I

16(1)+I16(2)+I16(3)

−− −−

Threshold 1 (TH1)

I

16(1)(max)(dch)

maximum discharge current TH1 = MX + V

LiL

; 1 line
delayed and low-pass
filtered

4.5 6 7.5 mA

S steepness − 15 − mA/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

t

DPDL

time constant low-pass filter TCPL = 0 (at 2fH);

RELC = 1

0.4 0.6 0.8 µs

Threshold 2 (TH2)

I

16(2)(max)(dch)

maximum discharge current TH2 = MX + V

LiL

× 1.10;

1 line delayed

4.5 6 7.5 mA

S steepness − 15 − mA/V

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

1997 Feb 06 26

Philips Semiconductors Preliminary specification

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

TDA4780

Threshold 3 (TH3)

I

16(3)(max)(dch)

maximum discharge current TH3 = MX + V

LiL

;
undelayed

0.45 0.6 0.75 mA

S steepness − 1.5 − mA/V
C

HARGE CURRENT

I

16

charge current −2 −1 −0.5 µA

V

16

start of contrast reduction − 4 − V

∆V

16

input range for full contrast reduction −−2−V

V

16

start of brightness reduction − 2.5 − V

∆V

16

input range for full brightness reduction −−1.6 − V

V

16(max)

maximum voltage by internal limitation 4.5 −−V
Hue adjust output (pin 26); note 14
V

o26(min)

minimum output voltage YEXH = 0; I2C-bus

data 00H

0.5 − 1.0 V

V

o26(nom)

nominal output voltage YEXH = 0; I2C-bus

data 20H

3.0 3.2 3.4 V

V

o26(max)

maximum output voltage YEXH = 0; I2C-bus

data 3FH

4.8 − 5.6 V

I

26

current of internal emitter follower 500 700 −µA

I

2

C-bus inputs

f

28

clock frequency range 0 − 100 kHz
t

SU;DAT

data set-up time 250 −−ns
t

H

clock pulse HIGH 4 −−µs
t

L

clock pulse LOW 4.7 −−µs
t

r

rise time −− 1µs
t

f

fall time −− 0.3 µs

Input levels (pins 27 and 28)

V

IL

LOW level input voltage −− 1.5 V
V

IH

HIGH level input voltage 3.0 − 5.5 V
I

I

input current V27and V28= 0.4 V −10 −−µA

V

27

and V28= 0.9V

P

−− 10 µA

Output level (pin 27)

V

OL

LOW level output voltage −− 0.4 V
I

O

output current V27= 0.4 V 3.0 −−mA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

1997 Feb 06 27

Philips Semiconductors Preliminary specification

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

TDA4780

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. 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 02H) by 15% if ADBL = 1. The line numbers are doubled if control bit HDTV = 1.

3. At minimum gamma (3FH) any differences in black level steps are amplified by 6 dB.

4. For nominal saturation the range of values is:
a) 1FH is the minimum value that can be used
b) 20H is the typical value that can be used
c) 21H is the maximum value that can be used.

5. For nominal contrast the range of values is:
a) 20H is the minimum value that can be used
b) 22H is the typical value that can be used
c) 24H is the maximum value that can be used.

6. . For meaning of actual nominal signal see
chapter “Characteristics”.

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

8. 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.

9. For nominal AC gain settings the range of values is:
a) 21H is the minimum value that can be used
b) 22H is the typical value that can be used
c) 23H is the maximum value that can be used.

10. . For meaning of actual nominal signal see
chapter “Characteristics”.

11. 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 is higher than the thresholds. The thresholds are
independent of supply voltage and temperature.

∆V

V

nom

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

∆ V

24

V

nom24

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

∆ V

22

V

nom22

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

–

∆ V

24

V

nom24

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

∆ V

20

V

nom20

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

–

∆ V

22

V

nom22

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

∆ V

20

V

nom20

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

–===

∆V

V

nom

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

∆ V

24

V

nom24

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

∆ V

22

V

nom22

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

–

∆ V

24

V

nom24

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

∆ V

20

V

nom20

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

–

∆ V

22

V

nom22

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

∆ V

20

V

nom20

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

–===

1997 Feb 06 28

Philips Semiconductors Preliminary specification

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

TDA4780

12. Blanking to ultra black level occurs during time DG except MR in R-channel, MG in G-channel, MB in B-channel (see
Fig.10).

a) Leakage current measuring time:

LM will start after the end of vertical sandcastle (see Fig.10).

b) Vertical blanking period and cut-off measurement lines (see Fig.10):

The vertical component will be identified if it contains 2 or more burst key pulses in the event of SC5 = 1 or two
or more line pulses (H) in the event 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.
c) Insertion time: full line period.
d) Measurement time: line period minus horizontal period (50/60 Hz).
e) Line sequence of measuring lines (see Fig.10):

First line after end of horizontal pulse which followed the end of vertical pulse: leakage measurement LM

First line after leakage measurement pulse: red measurement MR

Second line after leakage measurement pulse: green measurement MG

Third line after leakage measurement pulse: blue measurement MB.

13. 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 3FH. Black level adjustable via hue adjust DAC.

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

1997 Feb 06 29

Philips Semiconductors Preliminary specification

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

TDA4780

INTERNAL PIN CONFIGURATIONS

Abbreviations: OB: Open Base and CL: Clamp Pulse.

PIN

PIN NAME

(DESCRIPTION)

WAVE FORM I or Z INTERNAL CIRCUIT

1 fast switch 2 input

2 red input 2 100 µA/OB

3 green input 2 100 µA/OB

MGE883

1

+

4.2 kΩ

0.1 mA

1

ESD

protection

+

MGE884

colour bars

black

5 V

CL

MGE885

2

0.5 µA

CL

2

ESD

protection

+

MGE886

colour bars

black

5 V

CL

MGE887

3

0.5 µA

CL

3

ESD

protection

+

1997 Feb 06 30

Philips Semiconductors Preliminary specification

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

TDA4780

4 blue input 2 100 µA/OB

5 supply voltage

6 colour difference

input −(B − Y)

100 µA/OB

PIN

PIN NAME

(DESCRIPTION)

WAVE FORM I or Z INTERNAL CIRCUIT

colour bars

black

5 V

MGE888

CL

MGE889

4

0.5 µA

CL

4

ESD

protection

+

MGE890

5

+

V

P

5

ESD

protection

colour bars

4 V

MGE891

CL

MGE892

6

0.5 µA

CL

6

ESD

protection

+

1997 Feb 06 31

Philips Semiconductors Preliminary specification

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

TDA4780

7 colour difference

input −(R − Y)

100 µA/OB

8 luminance input 100 µA/OB

9 ground

no ESD protection circuit for
ground pin

PIN

PIN NAME

(DESCRIPTION)

WAVE FORM I or Z INTERNAL CIRCUIT

colour bars

4 V

MGE893

CL

MGE894

7

0.5 µA

CL

7

ESD

protection

+

colour bars

MGE895

CL

black

5 V

MGE896

8

0.5 µA

CL

8

ESD

protection

+

MGE897

9

GND

1997 Feb 06 32

Philips Semiconductors Preliminary specification

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

TDA4780

10 red input 1 100 µA/OB

11 green input 1 100 µA/OB

12 blue input 1 100 µA/OB

PIN

PIN NAME

(DESCRIPTION)

WAVE FORM I or Z INTERNAL CIRCUIT

MGE898

colour bars

black

5 V

CL

MGE899

10

0.5 µA

CL

10

ESD

protection

+

MGE900

colour bars

black

5 V

CL

MGE901

11

0.5 µA

CL

11

ESD

protection

+

colour bars

black

5 V

MGE902

CL

MGE903

12

0.5 µA

CL

12

ESD

protection

+

1997 Feb 06 33

Philips Semiconductors Preliminary specification

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

TDA4780

13 fast switch 1 input

14 sandcastle pulse

input

37 kΩ
(SC5 = 0)

OB
(SC5 = 1)

15 average beam

current limiting
input

OB

PIN

PIN NAME

(DESCRIPTION)

WAVE FORM I or Z INTERNAL CIRCUIT

MGE904

13

+

3.8 kΩ

0.2 mA

13

ESD

protection

+

3-level sandcastle

5.5 V

CL

3.5 V

H

MGE905

1.5 V

V

MGE907

14

+

+

14 kΩ

23 kΩ

1 kΩ

1 kΩ

50 µA

120 µA

SC5=1

14

ESD

protection

+

2-level sandcastle

3.5 V

CL

1.5 V

HV

MGE906

MGE908

15

ESD

protection

+

15

2 kΩ

30 µA

+

1997 Feb 06 34

Philips Semiconductors Preliminary specification

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

TDA4780

16 storage capacitor

for peak limiting

outside peak drive OB
during peak drive (RELC = 1) 0 to 12 mA
during peak drive (RELC = 0) 5 mA

17 storage capacitor

for leakage current
compensation

outside leakage current
measurement

OB

during leakage current
measurement

−400 µA to
+400 µA

automatic switch to power on reset 4 mA

PIN

PIN NAME

(DESCRIPTION)

WAVE FORM I or Z INTERNAL CIRCUIT

MGE909

16

ESD

protection

+

16

2 kΩ

30 µA

+

0 to 12 mA

4.2 V

peak
drive
detection

MGE910

12 µA

17

+

17

ESD

protection

+

4 mA

switch to
power on
reset

2.5 V
LM

1997 Feb 06 35

Philips Semiconductors Preliminary specification

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

TDA4780

18 storage capacitor

for peak dark

OB/0.26 mA

19 cut-off

measurement input

−300 µA to
+300 µA

PIN

PIN NAME

(DESCRIPTION)

WAVE FORM I or Z INTERNAL CIRCUIT

MGE911

18

2 kΩ

63 µA

2 µA

18

ESD

protection

+

+

0.26 mA
closed switch if

peak dark detected

closed switch during
active measurement
window

MGE912

preclamp

LM

MR MG MB

2.7 V

3.7 V

MGE913

19

60 µA

19

ESD

protection

+

+

0.5 mA

preclamp

3.15 V
to

4.3 V

warm up

finished

1997 Feb 06 36

Philips Semiconductors Preliminary specification

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

TDA4780

20 blue output 5 mA

5mA

5mA

21 blue cut-off

storage capacitor

during cut-off control or during
output clamping

OB

−300 µA to
+300 µA

PIN

PIN NAME

(DESCRIPTION)

WAVE FORM I or Z INTERNAL CIRCUIT

MGE914

BCOF = 0 1st line

sawtooth 

signal

brightness

cut-off
measurement
pulse

ultra black

MGE917

20

20

ESD

protection

+

5 mA

MGE915

BCOF = 1
MOD2 = 0

brightness

2.5 V

MGE916

BCOF = 1
MOD2 = 1

2.5 V

MGE918

21

5 kΩ

21

ESD

protection

+

2.5 V

1997 Feb 06 37

Philips Semiconductors Preliminary specification

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

TDA4780

22 green output 5 mA

5mA

5mA

23 green cut-off

storage capacitor

during cut-off control or during
output clamping

OB

−300 µA to
+300 µA

PIN

PIN NAME

(DESCRIPTION)

WAVE FORM I or Z INTERNAL CIRCUIT

MGE919

BCOF = 0 1st line

sawtooth 

signal

brightness

cut-off
measurement
pulse

ultra black

MGE922

22

22

ESD

protection

+

5 mA

MGE920

BCOF = 1
MOD2 = 0

brightness

2.5 V

MGE921

BCOF = 1
MOD2 = 1

2.5 V

MGE923

23

5 kΩ

23

ESD

protection

+

2.5 V

1997 Feb 06 38

Philips Semiconductors Preliminary specification

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

TDA4780

24 red output 5 mA

5mA

5mA

25 red cut-off storage

capacitor

during cut-off control or during
output clamping

OB

−300 µA to
+300 µA

PIN

PIN NAME

(DESCRIPTION)

WAVE FORM I or Z INTERNAL CIRCUIT

MGE924

BCOF = 0 1st line

sawtooth 

signal

brightness

cut-off
measurement
pulse

ultra black

MGE927

24

24

ESD

protection

+

5 mA

MGE925

BCOF = 1
MOD2 = 0

brightness

2.5 V

MGE926

BCOF = 1
MOD2 = 1

2.5 V

MGE928

25

5 kΩ

25

ESD

protection

+

2.5 V

1997 Feb 06 39

Philips Semiconductors Preliminary specification

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

TDA4780

26 Y output/hue adjust

output

0.7 mA

YEXH = 0; DC 0.8 V to 5.0 V 0.7 mA

27 I

2

C-bus serial data
input/acknowledge
output

outside acknowledge OB
during acknowledge less than

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

28 I

2

C-bus serial clock
input

OB

PIN

PIN NAME

(DESCRIPTION)

WAVE FORM I or Z INTERNAL CIRCUIT

colour bars

MGE929

YEXH = 1

MGE930

26

0.7 mA

26

ESD

protection

+

MGE931

27

ESD

protection

27

2 kΩ

10 µA

+

acknowledge

MGE932

28

2 kΩ

10 µA

28

ESD

protection

+

1997 Feb 06 40

Philips Semiconductors Preliminary specification

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

TDA4780

TEST AND APPLICATION INFORMATION

book, full pagewidth

MGE882

82 kΩ

10

kΩ

3.9 kΩ

3.9 kΩ

1 MΩ

100 Ω

100 Ω

22 µH

220 µF

22 µF

1 µF

1 µF

75

Ω

75

Ω

75

Ω

75

Ω

75

Ω

75

Ω

75

Ω

75

Ω

FSW

2R2G2B2

V

P

−(B − Y)

−(R − Y)

Y

GND

R

1G1B1

FSW

1

SC

FSW

2R2G2B2

−(B − Y)

−(R − Y)

Y

R

1G1B1

FSW

1

SC

SCL

SDA

YHUE

C

R

CGG

O

R

O

CBBOCI

G

O

R

O

BOCI

C

PDSTCL

C

PDL

BCL

TDA4780

10 nF

10 nF

10 nF

10 nF

47 nF

10 nF

10 nF

10 nF

10 nF

10 nF

330 nF

220 nF

220 nF

220 nF

GND

+12 V

200 V

1N4148

1N4148

V

P

= 8 V

beam

current

information

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

27

28

SCL SDA YHUE

1

2

3

4

5

6

7

8

9

10

BZX79

C6V2

R18

(2)

BR1

(1)

CON2

Fig.12 Test and application circuit.

(1) Insert link BR1 if average beam current is not applied.

(2) R18 may be omitted.

1997 Feb 06 41

Philips Semiconductors Preliminary specification

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

TDA4780

PACKAGE OUTLINE

UNIT

A

max.

1 2

b

1

(1)

(1) (1)

cD E weM

H

L

REFERENCES

OUTLINE

VERSION

EUROPEAN

PROJECTION

ISSUE DATE

IEC JEDEC EIAJ

mm

inches

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

SOT117-1

92-11-17
95-01-14

A

min.

A

max.

b

Z

max.

M

E

e

1

1.7

1.3

0.53

0.38

0.32

0.23

36.0

35.0

14.1

13.7

3.9

3.4

0.252.54 15.24

15.80

15.24

17.15

15.90

1.75.1 0.51 4.0

0.066

0.051

0.020

0.014

0.013

0.009

1.41

1.34

0.56

0.54

0.15

0.13

0.010.10 0.60

0.62

0.60

0.68

0.63

0.0670.20 0.020 0.16

051G05 MO-015AH

M

H

c

(e )

1

M

E

A

L

seating plane

A

1

w M

b

1

e

D

A

2

Z

28

1

15

14

b

E

pin 1 index

0 5 10 mm

scale

Note

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

handbook, full pagewidth

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

SOT117-1

1997 Feb 06 42

Philips Semiconductors Preliminary specification

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

TDA4780

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
our

“IC Package Databook”

(order code 9398 652 90011).

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
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

stg max

). If the
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.

1997 Feb 06 43

Philips Semiconductors Preliminary specification

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

TDA4780

DEFINITIONS

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

2

C COMPONENTS

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.

Purchase of Philips I

2

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

Internet: http://www.semiconductors.philips.com

Philips Semiconductors – a worldwide company

© Philips Electronics N.V. 1997 SCA53
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.

The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed
without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license
under patent- or other industrial or intellectual property rights.

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Tel. [phone], Fax. [phone]

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Tel. [phone], Fax. [phone]

Norway: Box 1, Manglerud 0612, OSLO,
Tel. [phone], Fax. [phone]

Philippines: Philips Semiconductors Philippines Inc.,
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Metro MANILA, Tel. [phone], Fax. [phone]

Poland: Ul. Lukiska 10, PL 04-123 WARSZAWA,
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Portugal: see Spain
Romania: see Italy
Russia: Philips Russia, Ul. Usatcheva 35A, 119048 MOSCOW,

Tel. [phone], Fax. [phone]
Singapore: Lorong 1, Toa Payoh, SINGAPORE 1231,

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Slovenia: see Italy
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Uruguay: see South America
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For all other countries apply to: Philips Semiconductors, Marketing & Sales Communications,
Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax. [phone]

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20124 MILANO, Tel. [phone], Fax. [phone]
Japan: Philips Bldg 13-37, Kohnan 2-chome, Minato-ku, TOKYO 108,

Tel. [phone], Fax. [phone]
Korea: Philips House, 260-199 Itaewon-dong, Yongsan-ku, SEOUL,

Tel. [phone], Fax. [phone]
Malaysia: No. 76 Jalan Universiti, 46200 PETALING JAYA, SELANGOR,

Tel. [phone], Fax. [phone]
Mexico: 5900 Gateway East, Suite 200, EL PASO, TEXAS 79905,

Tel. [phone]
Middle East: see Italy

Printed in The Netherlands 547047/1200/02/pp44 Date of release: 1997 Feb 06 Document order number: 9397 750 01716