P-DIP-18-5

P-DSO-28-1

7 x 5 Video Matrix Switch

TDA 6920

Semiconductor Group

12.96

Overview

1.1

Features

Fast

C Bus controlled (max. 400 kHz)

Cascadable (2 bus addresses)

7 CVBS inputs, 5 outputs
3 inputs with clamp disable by bus

1 input selectable as Y-input (S-VHS)

1 additional C-input (S-VHS)

Y+C operation for S-VHS
selected by bus

Fully ESD protected

60 dB max. crosstalk at 5 MHz (P-DSO-28-1 only)

Low operating voltage of 7.5 V

5 V operation is possible with reduced output signals
of max. 2 Vpp

15 MHz minimum bandwidth

Noise insensitive clamping inputs

Low impedance off condition
separate for each output

1.2

General Description

The TDA 6920 switches 7 video input sources to 5 outputs. Each output can be switched
to only one input, but one input can be switched to all outputs. The C-input may be
combined with one CVBS input as Y for Y+C (S-VHS) operation. Y+C operation is
selected by bus.

1.3

Application

Television sets

Satellite receivers

Video mixing desks

Type

Ordering Code

Package

TDA 6920

Q67000-A5200

P-DIP-18-5

TDA 6920X

Q67007-A5225 GEG

P-DSO-28-1

TDA 6920

Semiconductor Group

1.5

Pin Definitions and Functions

Pin No.

Symbol

Function

P-DIP-18-5

P-DSO-28-1

GND

Signal and power supply ground

IN1

CVBS input 1

GND

Signal and power supply ground

IN2

CVBS input 2

GND

Signal and power supply ground

IN3

CVBS input 3

GND

Signal and power supply ground

IN4

CVBS input 4

GND

Signal and power supply ground

IN5

CVBS input 5

REF

Reference Voltage for external use

IN6

CVBS input 6

GND

Power supply groung

IN7

CVBS input 7

SCL

C-Bus clock

SDA

C-Bus data

ADDRESS

Address selection

OUT5

CVBS output 5

GND

Signal and power supply ground

OUT4

CVBS output 4

GND

Signal and power supply ground

OUT3

CVBS output 3

GND

Signal and power supply ground

OUT2

CVBS output 2

GND

Signal and power supply ground

OUT1

CVBS output 1

Positive power supply voltage

Separate color adding input for input 1

TDA 6920

Semiconductor Group

Functional Description

The main function of the IC is to switch 7 input video sources to 5 outputs.

Each output can be switched to only one input.

It is possible to have the same input connected to several outputs.

3 of the inputs can be used as non-clamping-input, switching is controlled by bus.

The clamping function of the other 4 inputs can be overriden by external resistor divider.

The other 4 inputs can be switched to non-clamping mode with external R/C network.

All switching possibilities are controlled by the

C Bus.

All outputs can be switched to low impedance off condition by the

C Bus.

Driving 75

load requires external transistors for best performance.

The recommended coupling capacitor at each input is 47 nF.

Each clamping input requires a 75

(max. 500

) termination resistor.

Operation without or with a termination resistor greater than 500

causes malfunction

of the new high performance clamping circuit.

Unused inputs should be directly grounded.

8 bits are necessary to determine one complete configuration change.

(1 addressbyte, 5 databytes)

Minimum configuration change for 1 output needs 2

8 bit (1 addressbyte, 1 databyte).

Power on reset state: all 5 outputs switched to input 1, all inputs clamped, Y+C off.

Address Selection (fast

C Bus)

1st byte of transmisson (8 bit)

Hex

Binary

Address Pin

MSB

LSB

1001

0110

(min. 3 V)

1001

0100

GND

TDA 6920

Semiconductor Group

Data Mode Selections (fast

C Bus)

2nd byte of transmission (8 bit)

..X = don't care

Output Selection (3 bit, bit 7 must always be 0)

b7 b6

b5 b4 b3

b2 b1 b0

Selected Output

000

XXX

- not used

001

XXX

OUT1

010

XXX

OUT2

011

XXX

OUT3

100

XXX

OUT4

101

XXX

OUT5

110

XXX

- not used

111

XXX

- not used

Input Selection Clamped (3 bit, bit 7 must always be 0)

b7 b6

b5 b4 b3

b2 b1 b0

Selected Input

XXX

000

Output off condition

XXX

001

IN1

XXX

010

IN2

XXX

011

IN3

XXX

100

IN4

XXX

101

IN5

XXX

110

IN6

XXX

111

IN7

TDA 6920

Semiconductor Group

Data Mode Selections (fast I

C Bus) continued

2nd byte of transmission (8 bit)

Bus Protocol (fast

C Bus)

Programming Example: SDA sequence

X = don't care (if only input operation mode change is requested, b5, b4
b3 should be 0, 0, 0: no output configuration is changed.)

Input Selection Non Clamped / Y+C (Y: always clamped. C: non clamped)
(3 bit, bit 7 must always be 0)

b7 b6

b5 b4 b3

b2 b1 b0

Selected input

XXX

001

in1, (Y+C) off

XXX

010

in2, clamp on

XXX

011

in3, clamp on

XXX

100

in4, clamp on

XXX

001

in1, (Y+C) on

XXX

010

in2, clamp off

XXX

011

in3, clamp off

XXX

100

in4, clamp off

start
condition

address 96

1st data: output 4 connect
to input 3 clamped

MSB

LSB

.....

mode

output

input

1001

0110

100

011

data: output 5 connect to
input 1 (Y+C)

last data: output 1 connect
to input 4 not clamped

stop
condition

.....

mode

output

input

.....

mode

output

input

101

001

100

serial data stream

TDA 6920

Semiconductor Group

Electrical Characteristics

Note: Maximum ratings are absolute ratings; exceeding only one of these values may

cause irreversible damage to the integrated circuit.

3.1

Absolute Maximum Ratings

Parameter

Symbol

Limit Values

Unit

Test Condition

min.

max.

Supply voltage (

)

Reference voltage
(P-DSO-28-1 only)

REF

Reference current
(

Lmin

= 1 k

)

REF

3.5

Output voltage

OUT1 - OUT5

Output current
(

Lmin

= 500

)

OUT1 - OUT5

Input voltage

IN1 - IN7

SCL, SDA, address input
voltage

SDA, SCL,

Address

ESD-voltage all pins HBM
(

= 1.5 k

= 100 pF)

ESD

Junction temperature

150

Storage temperature

stg

125

Thermal resistance
(system - air)

th SA

K/W

TDA 6920

Semiconductor Group

Note: In the operating range the functions given in the circuit description are fulfilled.

3.2

Operating Range

Parameter

Symbol

Limit Values

Unit

Test Condition

min.

max.

Supply voltage

7.5

13.2

Absolute minimum supply
voltage (only usable with
reduced output signals of max.
2 Vpp)

4.5

Reference voltage
(P-DSO-28-1 only)

REF

3.3

3.9

Video-input frequency range
3 dB

IN IN1 - IN7, C

MHz

Video-input AC-voltage (color)

1.0

Vpp

Video-input AC-voltage
(Y, CVBS)

IN1 - IN7

1.7

Vpp

Video-output AC-voltage

OUT1 - OUT5

3.4

Vpp

Input DC-voltage

1.3

2.3

Input DC-voltage (clamping)

IN1 - IN7

1.8

3.5

Input DC-voltage
(non clamping)

IN2, 3, 4

1.5

3.2

Input source-impedance
(clamping)

IN1 - IN7

500

C-Bus clock

IN SDA, SCL

500

kHz

Ambient temperature during
operation

TDA 6920

Semiconductor Group

3.3

DC Characteristics

= 25

= 8.5 V

Parameter

Symbol

Limit Values

Unit Test Condition

min.

typ.

max.

Total current consumption

Reference voltage
(P-DSO-28-1 only)

REF

3.4

3.6

3.8

Output DC-voltage
(clamping)

OUT1 - OUT5

1.8

C, IN1 - IN7

= 0 Vpp

Output DC-voltage
(output off)

OUT1 - OUT5

0.8

C, IN1 - IN7

= 0 Vpp

Output current

OUT1 - OUT5

0.5

1.0

2.0

OUT

= 2 V,

In = 0 Vpp

Input DC-voltage

1.8

= 0 Vpp

Input DC-voltage
(clamping)

IN1 - IN7

1.8

IN1 - IN7

= 0 Vpp

Input current (clamping)

IN1 - IN7

0.33

IN1 - IN7

= 0 Vpp

Input DC-voltage (for ext.
clamping override)

IN1 - IN7

2.4

IN1 - IN7

= 0 Vpp

Input DC-voltage (non-
clamping, Bus controlled)

IN2, 3, 4

2.4

IN2, 3, 4

= 0 Vpp

Input current
(SCL, SDA, address)

SDA, SCL

Address

0.1

0.4

SDA, SCL

= 0 V

Address

= 0 V

Output current (SDA)

SDA

= 0.6 V

Output voltage low (SDA)

SDA

0
0

0.2
0.3

0.4
0.6

V
V

SDA

= 3 mA sink

SDA

= 3 mA sink

SCL, SDA, address
(96 hex) : high

SDA, SCL

Address

3.0

SCL, SDA, address
(94 hex) : low

SDA, SCL

Address

1.5

SCL, SDA, address
(hysteresis)

SDA, SCL

Address

0.2

dependant on
input frequency

TDA 6920

Semiconductor Group

Note: The listed characteristics are ensured over the operating range of the integrated

circuit. Typical characteristics specify mean values expected over the production
spread. If not otherwise specified, typical characteristics apply at

= 25

C and

the given supply voltage.

3.4

AC Characteristics

= 25

= 8.5 V

Parameter

Symbol

Limit Values

Unit Test Condition

min.

typ.

max.

Video bandwidth

OUT/IN

MHz 3 dB point

Video gain

OUT/IN

1.9

2.0

2.1

Crosstalk (0 - 5 MHz)
P-DSO-28-1

inputs 75

to GND

Crosstalk (0 - 5 MHz)
P-DSO-28-1

inputs 500

to GND

Crosstalk (0 - 5 MHz)
P-DIP-18-5

inputs 75

to GND

Crosstalk (0 - 5 MHz)
P-DIP-18-5

inputs 500

to GND

Input AC-voltage

0.75

Vpp sinus

Input AC-voltage

IN1 - IN7

1.5

Vpp clamped

Input AC-voltage (sinus)

IN2, 3, 4

1.5

Vpp non clamped

Output AC-voltage

OUT1 - OUT5

Vpp

C-Bus clock

IN SDA, SCL

400

500

kHz

Output linearity

OUT1-

OUT5

0.2

Input resistance
(non-clamping)

C, IN2, 3, 4

Input source-impedance
(clamping)

IN1 - IN7

500

Input coupling-capacitor
(clamping)

IN1 - IN7

47
10

CVBS-signal >
20 Hz Audiosignal

Output dyn. impedance

OUT1 - OUT5

TDA 6920

Semiconductor Group

Electrical Diagrams

Typical frequency response and crosstalk
(simulated) for P-DSO-28-1 package

Conditions:

= 8.5 V, all outputs selected to one different input;

response:

the measured output has max. signal on the selected input;

crosstalk:

the measured output has no signal on the selected input, another input has
max. signal

TDA 6920

Semiconductor Group

Package Outlines

P-DIP-18-5
(Plastic Dual in-line Package)

GPD05586

P-DSO-28-1
(Plastic Dual Small Outline Package)

GPS05123

Sorts of Packing
Package outlines for tubes, trays etc. are contained in our
Data Book "Package Information".

Dimensions in mm

SMD = Surface Mounted Device

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