TEA6425(1996) Ver la hoja de datos (PDF) - STMicroelectronics

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Fabricante

TEA6425
(Rev.:1996)

VIDEO CELLULAR MATRIX

STMicroelectronics 

TEA6425

ABSOLUTE MAXIMUM RATINGS

Symbol

VCC

VI

Toper

Tstg

Parameter

Supply Voltage

Voltage at Pin i to GND

Operating Ambient Temperature

Storage Temperature

Value

12

0, VCC

0, + 70

-20, + 150

Unit

V

V

oC

oC

THERMAL DATA

Symbol

Parameter

Rth (j-a) Junction-ambient Thermal Resistance

Value

Unit

Min.

80

oC/W

ELECTRICAL CHARACTERISTICS (VCC = 8V, Tamb = 25oC, VIN = 1V, Gain = 6.5dB, Cload = 20pF,

Rload = 4.7kΩ ; Gain condition, clamp and 3-state are controlled by I2C bus, unless otherwise specified)

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

SUPPLY

VCC Supply Voltage

ICC Supply Current

RR Supply Voltage Rejection

f = 1kHz

7.2

8

8.8

V

45 60 mA

40 46

dB

VIDEO INPUTS (clamping at bottom sync level)

VIN Max. Signal Amplitude

Vclamp

VDC

Clamp Level

Input DC Level

IIN

Iclamp

Leakage Current

Clamp Current

VIDEO OUTPUTS

Clamp Active

2

VPP

Clamp Active

1.7

2

2.3

V

Clamp Inactive

2.7

3

3.3

V

1 input connected to 1 output

2

5

µA

Vclamp - 200mV

0.9

3

mA

ROUT

ZHI

CHI

G1

G2

Vsync

Vbias

B

Output Resistance

Output ”off” Impedance

COUT in 3-state

Voltage Gain

Voltage Gain

Top Level Sync (Y or CVBS)

Output Mean Level (chroma)

Isolation ”off” State

Crosstalk Attenuation between Channels

Bandwidth

no load

no load

f = 100kHz

f = 100kHz

G = 6.5dB, Clamp Active

G = 0.5dB, Clamp Inactive

G = 6.5dB, Clamp Inactive

f = 5MHz

f = 5MHz

Cload = 20pF, G = 6.5dB

at ± 0.5dB

at ± 1dB

at - 3dB

15 50

Ω

50

kΩ

3

pF

0

0.5

1

dB

6

6.5

7

dB

1 1.25 2

V

2

2.4

3

V

3

3.4

4

V

60

dB

50 60

dB

MHz

5

10

21

FUNCTIONAL DESCRIPTION

This device is controlled via the I2C bus. 4 ad-

dresses can be selected by a 4-level detector on

Pin 7, thus enabling parallel connection of 4 de-

vices.

Via the I2C bus :

- The input signals can be clamped at their nega-

tive 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

impedance state.

Two internal SVHS mixers will add the selected Y

and C inputs. Two dedicated outputs will have the

option to select this added signal also.

3/9

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