SGS Thomson Microelectronics TEA6425 Datasheet

.

6 VIDEO INPUTS - 8VIDEO OUTPUTS

.

2 INTERNALSELECTABLEYC ADDERS

.

15MHz BANDWIDTH @ -3dB

.

SELECTABLE 0.5/6.5dB GAIN FOR EACH
OUTPUT

.

HIGH IMPEDANCE SWITCH FOR EACH
OUTPUT(3-stateoperation)

.

PROGRAMMABLE CLAMP MODE ON EACH
INPUT(sync bottom or average value)

.

-60dB CROSSTALK @ 5MHz

.

4 SUB-ADDRESSCAPABILITY

.

I2C BUS CONTROL

DESCRIPTION

Thisdeviceisintendedforswitchingbetweenvideo
and chroma signals such as CVBS,SVHS, base­band CVBS, MAC. Each input clamp mode, each
outputgain, all switchingare controlledthroughthe

2

Cbus.The8 outputscanbesetseparatelyinhigh

I
impedancestate, toenableparallelDC connection
of several devices (up to 4).

TEA6425

VIDEO CELLULAR MATRIX

DIP20

(Plastic Package)

ORDER CODE : TEA6425

SO20L

(Plastic Micropackage)

ORDER CODE : TEA6425D

PINCONNECTIONS

May 1996

IN 1

SDA

IN 2

SCL

IN 3

IN 4

SUB

IN 5

V

CCP

IN 6

1

2
3
4

5
6

7
8
9

10

20

19
18
17

16
15

14
13
12

11

V

CC

OUT 1

OUT 2
OUT 3
OUT 4

OUT 5
OUT 6

OUT 7
OUT 8

GND

6425-01.EPS

1/9

TEA6425

BLOCK DIAGRAM

SUB-ADDRESS

INPUTS

SCL

SDA

V

CC1

V

CC2

1

3

5

6

8

10

4
2
7

9

20

TEA6425

PROG.

CLAMP

PROG.

CLAMP

PROG.

CLAMP

PROG.

CLAMP

PROG.

CLAMP

PROG.

CLAMP

I2C

DECODER

6x8

MATRIX

0/6dB0/6dB0/6dB0/6dB0/6dB0/6dB0/6dB0/6

3 S TATE OUTPUTS

11

GND

1312

OUTPUTS

dB

191817161514

6425-02.EPS

CELLULAR MATRICE CONNECTIONS

1st/4addresses

CVBS

or C

PROG.

CLAMP

2

IC

DECODER

6X8

Full MATRIX

IC1

ADDER

6 INPUTS

0dB
6dB

3STATE

OUT

8 OUTPUTS LINES

2nd/4 addresses

2

IC

DECODER

6X8

Full

MATRIX

IC2

6 INPUTS

IC3

IC4

6425-03.EPS

2/9

TEA6425

ABSOLUTEMAXIMUMRATINGS

Symbol Parameter Value Unit

V

V

T

oper

T

THERMALDATA

Supply Voltage 12 V

CC

Voltage at Pin i to GND 0, V

I

CC

Operating Ambient Temperature 0, + 70
Storage Temperature -20, + 150

stg

V

o

C

o

C

6425-01.TBL

Symbol Parameter Value Unit

R

th (j-a)

ELECTRICAL CHARACTERISTICS (VCC=8V,T

R

load

Junction-ambient Thermal Resistance Min. 80

=25oC, VIN= 1V, Gain = 6.5dB,C

amb

load

= 4.7kΩ ; Gain condition, clamp and 3-state are controlledby I2C bus, unless otherwisespecified)

=20pF,

o

Symbol Parameter Test Conditions Min. Typ. Max. Unit

SUPPLY

V

I

CC

SupplyVoltage 7.2 8 8.8 V

CC

SupplyCurrent 45 60 mA

RR SupplyVoltage Rejection f = 1kHz 40 46 dB

VIDEO INPUTS (clamping at bottom sync level)

V

V

V

I

clamp

clamp

I

Max. Signal Amplitude Clamp Active 2 V

IN

Clamp Level Clamp Active 1.7 2 2.3 V
InputDC Level Clamp Inactive 2.7 3 3.3 V

DC

Leakage Current 1 input connected to 1 output 2 5 µA

IN

Clamp Current V

- 200mV 0.9 3 mA

clamp

VIDEO OUTPUTS

R

OUT

Z

C

Output Resistance 15 50 Ω
Output ”off” Impedance no load 50 kΩ

HI

C

HI

in 3-state no load 3 pF

OUT

G1 Voltage Gain f = 100kHz 0 0.5 1 dB
G2 Voltage Gain f = 100kHz 6 6.5 7 dB

V

sync

V

Top Level Sync (Y or CVBS) G = 6.5dB, Clamp Active 1 1.25 2 V
Output Mean Level (chroma) G = 0.5dB, Clamp Inactive

bias

G = 6.5dB, Clamp Inactive

2

2.4

3

3.4

3

4
Isolation ”off” State f = 5MHz 60 dB
Crosstalk Attenuation between Channels f = 5MHz 50 60 dB

B Bandwidth C

= 20pF, G = 6.5dB

load

at ± 0.5dB
at ± 1dB
at - 3dB

5
10
21

C/W

PP

V
V

MHz

6425-02.TBL

6425-03.TBL

FUNCTIONAL DESCRIPTION

This device is controlled via the I2C bus. 4 ad­dresses can be selected by a 4-level detector on
Pin 7, thus enabling parallel connection of 4 de­vices.

2

Viathe I

C bus :

- The input signals can be clampedat their nega­tive peak(top sync).

- The gain factor of the outputs can be selected

between 0.5 and 6.5dB.

- Each of the 6 inputs can be connected to the 8
outputs.

- Each output can individually be set in a high
impedancestate.

Two internal SVHS mixerswill add the selectedY
and C inputs. Twodedicated outputswill have the
option to select this added signalalso.

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