ST TEA6425 User Manual
TEA6425
VIDEO CELLULAR MATRIX
■6 Video Inputs - 8 Video Outputs
■2 Internal Selectable YC Adders
■15MHz Bandwidth @ -3dB
■Selectable 0.5/6.5dB Gain FOR EACH Output
■High Impedance Switch for each Output (3- state operation)
■Programmable Clamp Mode on each Input (sync bottom or average value)
■-60dB Crosstalk @ 5MHz
■4 Sub-address Capability
■I2C Bus Control
DESCRIPTION
This device is intended for switching between video and chroma signals such as CVBS, SVHS, baseband CVBS, MAC. Each input clamp mode, each output gain, all switching are controlled through the I2C bus. The 8 outputs can be set separately in high impedance state, to enable parallel DC connection of several devices (up to 4).
Figure 1. Pin Connections
DIP20
(Plastic Package)
ORDER CODE: TEA6425
SO20L
(Plastic Micropackage)
ORDER CODE: TEA6425D
IN 1 |
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20 |
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VCC |
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SDA |
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OUT 1 |
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IN 2 |
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OUT 2 |
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SCL |
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OUT 3 |
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IN 3 |
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OUT 4 |
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IN 4 |
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OUT 5 |
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SUB |
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OUT 6 |
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IN 5 |
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OUT 7 |
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VCCP |
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OUT 8 |
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IN 6 |
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GND |
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September 2003
6425-01.eps
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TEA6425
Figure 2. Block Diagram
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PROG. |
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CLAMP |
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PROG. |
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CLAMP |
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5 |
PROG. |
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INPUTS |
CLAMP |
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6 x 8 |
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PROG. |
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MATRIX |
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6 |
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CLAMP |
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8 |
PROG. |
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CLAMP |
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10 |
PROG. |
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CLAMP |
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SCL |
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SDA |
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I2C |
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DECODER |
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SUB-ADDRESS |
7 |
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0/6 |
0/6 |
0/6 |
0/6 |
0/6 |
0/6 |
0/6 |
0/6 |
VCC1 |
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dB |
dB |
dB |
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dB |
dB |
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dB |
VCC2 |
20 |
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3 STATE OUTPUTS |
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TEA6425 |
11 |
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16 |
17 |
18 |
19 |
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GND |
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OUTPUTS |
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Figure 3. Cellular Matrix Connections
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1st/4 addresses |
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2nd/4 addresses |
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CVBS |
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I2 C |
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I2 C |
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or C |
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DECODER |
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DECODER |
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PROG. |
6 X 8 |
6 X 8 |
CLAMP |
Full MATRIX |
Full |
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INPUTS6 |
IC1 |
MATRIX |
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INPUTS6 |
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IC2 |
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ADDER |
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0dB |
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6dB |
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3STATE OUT
IC3
IC4
8 OUTPUTS LINES
2/10
6425-02.eps
6425-03.eps
1
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TEA6425 |
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ABSOLUTE MAXIMUM RATINGS |
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Symbol |
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Parameter |
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Value |
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Unit |
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VCC |
Supply Voltage |
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12 |
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V |
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VI |
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Voltage at Pin i to GND |
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0, VCC |
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V |
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Toper |
Operating Ambient Temperature |
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0, + 70 |
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oC |
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Tstg |
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Storage Temperature |
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-20, + 150 |
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oC |
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THERMAL DATA |
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Symbol |
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Parameter |
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Value |
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Unit |
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Rth (j-a) |
Junction-ambient Thermal Resistance |
Min. |
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80 |
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oC/W |
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ELECTRICAL CHARACTERISTICS (V |
= 8V, T |
= 25oC, V = 1V, Gain = 6.5dB, C |
load |
= 20pF, R |
load |
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CC |
amb |
IN |
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= 4.7kΩ ; Gain condition, clamp and 3-state are controlled by I2C bus, unless otherwise specified) |
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Symbol |
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Parameter |
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Test Conditions |
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Min. |
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Typ. |
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Max. |
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Unit |
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SUPPLY |
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VCC |
Supply Voltage |
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7.2 |
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8 |
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8.8 |
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V |
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ICC |
Supply Current |
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45 |
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60 |
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mA |
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RR |
Supply Voltage Rejection |
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f = 1kHz |
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40 |
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46 |
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dB |
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VIDEO INPUTS (clamping at bottom sync level) |
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VIN |
Max. Signal Amplitude |
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Clamp Active |
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2 |
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VPP |
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Vclamp |
Clamp Level |
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Clamp Active |
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1.7 |
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2 |
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2.3 |
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V |
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VDC |
Input DC Level |
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Clamp Inactive |
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2.7 |
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3 |
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3.3 |
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V |
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IIN |
Leakage Current |
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1 input connected to 1 output |
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2 |
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5 |
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µA |
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Iclamp |
Clamp Current |
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Vclamp - 200mV |
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0.9 |
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3 |
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mA |
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VIDEO OUTPUTS |
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ROUT |
Output Resistance |
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15 |
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50 |
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W |
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ZHI |
Output "off" Impedance |
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no load |
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50 |
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kΩ |
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CHI |
COUT in 3-state |
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no load |
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3 |
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pF |
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G1 |
Voltage Gain |
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f = 100kHz |
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0 |
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0.5 |
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1 |
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dB |
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G2 |
Voltage Gain |
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f = 100kHz |
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6 |
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6.5 |
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7 |
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dB |
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Vsync |
Top Level Sync (Y or CVBS) |
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G = 6.5dB, Clamp Active |
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1 |
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1.25 |
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V |
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Vbias |
Output Mean Level (chroma) |
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G = 0.5dB, Clamp Inactive |
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2 |
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2.4 |
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3 |
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V |
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G = 6.5dB, Clamp Inactive |
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3.4 |
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4 |
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V |
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Isolation "off" State |
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f = 5MHz |
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60 |
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dB |
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Crosstalk Attenuation between |
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f = 5MHz |
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50 |
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60 |
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dB |
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Channels |
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Cload = 20pF, G = 6.5dB |
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5 |
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B |
Bandwidth |
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at ± 0.5dB |
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MHz |
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at ± 1dB |
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10 |
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at - 3dB |
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21 |
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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.
Via the I2C bus :
–The input signals can be clamped at 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 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.
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