STV6415A
I²C bus-controlled video matrix switch
Features
■
■
■
■
■
20 MHz bandwidth
Cascadable with another STV6415A (internal
address can be changed by pin 7 voltage)
Eight inputs (CVBS, RGB, Chroma, …)
Six outputs
Possibility of chroma signal for each input by
switching off the clamp with an external resistor
bridge
I²C bus-controlled
6.5 dB gain between any input and output
–55 dB crosstalk at 5 MHz
Full ESD protection
Description
The main function of the STV6415A is to switch
eight video input sources on the six outputs.
Each output can be switched to only one of the
inputs, whereas any single input may be
connected to several outputs.
All switching possibilities are controlled through
the I²C bu
s.
Table 1.
Order code
STV6415AB
■
■
■
■
Device summary
Packaging
SO 20
Plastic small outline package
August 2008
Rev 1
1/15
www.st.com
1
STV6415A
1
2
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
I²C bus characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
I²C bus selections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.5.1
Second and following bytes (input/output selection) . . . . . . . . . . . . . . . . 8
Input/output pin configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Using a second STV6415A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1
Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2/15
STV6415A
General description
1
General description
Figure 1.
STV6415A Pin-out diagram
Input
Data
Input
Clock
Input
Input
Prog
Input
VCC
Input
1
2
S
3
4
5
6
7
8
9
10
T
V
6
4
1
5
A
14
13
12
11
Output
Output
Ground
Input
20
19
18
17
16
15
Input
Ground
Output
Output
Output
Output
3/15
General description
Figure 2.
STV6415A block diagram
OutputOutputOutputOutputOutputOutput
Ground
18
Input
Input
Input
Input
Input
Input
Input
Input
1
3
5
6
8
10
11
20
17
16
15
14
13
12
STV6415A
Bus Decoder
2
Data
7
Prog
4
Clock
9
VCC
19
Ground
The main function of the STV6415A is to switch eight video input sources on the six outputs.
Each output can be switched to only one of the inputs, whereas any single input may be
connected to several outputs. The lowest level of each signal is aligned on each input
(bottom of sync pulse for CVBS or Black Level for RGB signals).
The nominal gain between any input and output is 6.5 dB. For Chroma signals, the
alignment is switched off by forcing, with an external 5 V
DC
resistor bridge on the input.
Each input can be used as a normal input or as a Chroma input (with external resistor
bridge). All the switching possibilities are changed through the I²C bus.
Driving a 75
Ω
load requires an external transistor.
The switch configuration is defined by words of 16 bits: the I²C address (8 bits) then one
output configuration (8 bits). Therefore, six separated words of 16 bits are necessary to
determine the starting configuration at power-on (power supply: 0 to 10 V).
A new configuration needs only the words (16 bits) of the changed output channels.
4/15
STV6415A
STV6415A
Electrical characteristics
2
2.1
Table 1.
Symbol
V
CC
T
A
T
STG
Electrical characteristics
Absolute maximum ratings
Absolute maximum ratings
Parameter
Supply voltage (pin 9)
Operating ambient temperature range
Storage temperature range
Value
12
0 to +70
–20 to +150
Unit
V
o
C
o
C
2.2
Table 2.
Symbol
R
thJA
Thermal data
Thermal data
Parameter
Junction-to-ambient thermal resistance
SO20
Value
100
Unit
o
C/W
2.3
Table 3.
Symbol
V
CC
I
CC
Inputs
Electrical characteristics
(T
A
= 25 °C , V
CC
= 10 V , R
LOAD
= 10 kΩ , C
LOAD
= 3 pF (unless otherwise specified)
Electrical characteristics
Parameter
Supply voltage (pin 9)
Power supply current (without load on outputs; V
CC
= 10 V)
Min.
8
14
Typ.
10
19
Max.
11
25
Unit
V
mA
Signal amplitude (CVBS signal)
Input current (input voltage = 5 V
DC
)
DC level
DC level shift (temperature from 0 to 70°C)
Outputs
(V
IN
= 1 V
PP
for all dynamic tests) Pins 13,14, 15, 16, 17 and 18
Dynamic
Output impedance
Gain
Bandwidth
Crosstalk
–1dB attenuation
–3dB attenuation
f = 3.58 MHz
f = 5 MHz
6
7
4.5
5.5
25
6.5
15
20
–60
–55
3.3
1
3.6
5
2
3
3.9
100
V
PP
µA
V
mV
V
PP
50
7
Ω
dB
MHz
–50
–45
dB
5/15
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