AVPro® 5002R
Dual SCART A/V Switch
DATA SHEET
SEPTEMBER 2008
DESCRIPTION
The AVPro
®
5002R device is an audio/video switching
IC that supports an input/output port, an input only port,
and an output only port. The device includes
multiplexers that allow the inputs to be routed to the
outputs in various configurations. Additional outputs are
provided to drive an external RF modulator. The video
outputs of the multiplexers are buffered to drive 150Ω
loads. The audio outputs are buffered to provide 2
Vrms output. The 5002R has features optimized for
Canal+ satellite receiver applications, but it can also be
used in other applications that require control of
multiple audio and video sources.
FEATURES
•
Two SCART connections (Auxiliary, TV)
•
Video section
- Integrated output drivers
- RGB, SVHS, composite outputs
- Programmable RGB gain
•
Audio section
- Dual mode volume control
0 or 6 dB gain, plus 0 to -63 dB attenuation (1 dB
step)
- Programmable gain on DAC input channels
•
Serial port control of switching I
2
C bus
•
64-lead LQFP, 48 QFN package options
_____________________________________________
BLOCK DIAGRAM
VCC
VCC
VCC
VDD
VDD
ABLANK
EBLANK
Aux_R
Aux_G
Aux_B
Enc_R
Enc_G
Enc_B
Enc_C
Enc_Y
Enc_YC
Enc2_Y
Enc2_C
Aux_YC
Aux_Cin
TV_YCin
SCLK
SDATA
Aux_Lin
Aux_Rin
Lin
Rin
TV_Lin
TV_Rin
Vref
Rbias
Tgen
Support
Circuits
Mux
Volume
Control
Serial
Port
Other I/O
BLANK
TV_R
TV_G
TV_B
TV_YCout
Mux
MOD_YC
Aux_YCout
Aux_Cout
TV_Fnc
Aux_Fnc
DO_0
DO_1
Rout
Lout
TV_Rout
TV_Lout
Mod_Mono
Aux_Lout
Aux_Rout
Aux_Mono
GND
GND
GND
Page: 1 of 30
GND
©
2005 TERIDIAN Semiconductor Corporation
Rev 2.1
AVPro® 5002R
Dual SCART A/V Switch
DATA SHEET
Functional Description
The 5002R is an audio/video switching device. The
device integrates both audio and video drivers so that it
can directly drive the SCART interface. All
programmable functions of the device are controlled
through a standard I
2
C serial interface and a set of
internal registers.
The device will interface to an external video encoder
that provides six video outputs. In addition, the 5002R
includes two programmable digital outputs and
provides inputs for the TV SCART audio/video.
SCART Video Switching
The device is designed to accept video signals from an
auxiliary SCART connector, TV SCART connector, and
an external video encoder/DAC device. The devices
include a set of analog multiplexers that receive video
signals from these sources and allow routing of the
signals to the various video outputs. The video output
drivers have a nominal gain of 2 V/V to allow for a
series resistance of 75Ω prior to the 75Ω termination. A
block diagram of the video switching function is
provided in Figure 1. Details of the register settings are
provided in the section titled “Serial Port Register
Tables”.
ABLANK
EBLANK
Aux_R
Enc_R
Enc_C
Enc2_C
0V
4V
Mux
Gain
BLANK
Mux
TV_R
Mux
Aux_G
Enc_G
Aux_B
Enc_B
Enc_Y
Enc_YC
Aux_Cout
TV_G
TV_B
Mux
Mux
Mux
TV_YCout
Mux
TV_YCin
Enc2_Y
Aux_YC
Aux_Cin
Aux_Fnc
Comparator
VGen
Mux
Aux_YCout
Mux
Mod_YC
TV_Fnc
FIGURE 1: 5002R VIDEO SWITCHING BLOCK DIAGRAM
Note: Aux_Cin, Enc2_Y and Enc2_C are not available on the 48QFN package option.
Page: 2 of 30
©
2008 TERIDIAN Semiconductor Corporation
Rev 2.1
AVPro® 5002R
Dual SCART A/V Switch
DATA SHEET
TV RGB Outputs
The device accepts RGB video signals from two
sources. The
Aux_R, Aux_G, Aux_B
input pins are
typically connected to the auxiliary SCART connector.
The
Enc_R, Enc_G, Enc_B
input pins are connected to
the RGB outputs of an external video encoder device.
These outputs are used as a video source for the TV
SCART pins
TV_R, TV_G,
and
TV_B.
The RGB video
source is selected by setting the lower three (3) bits of
serial port Register 1. When these bits are set to
xxxxx000, the RGB source will be the encoder. When
these bits are set to xxxxx001, the source will be the
auxiliary port. The TV RGB outputs can be muted
independently from the TV composite outputs. Setting
Bit 6 of Register 1 low (0) will allow normal operation.
Setting Bit 6 high (1) will set the TV RGB outputs to the
blank level.
RGB Gain:
The gain of the RGB outputs can be
adjusted to one of four different levels. Bits 4 and 5 in
Register 2 set the gain of the RGB output amplifiers
according to the following table:
Bit 5
0
0
1
1
Bit 4
0
1
0
1
RGB Amplifier Gain
Gain = 2 V/V = A
0
Gain = A
0
- 10%
Gain = A
0
- 20%
Gain = A
0
- 30%
Bit 7
0
0
1
1
Bit 6
0
1
0
1
Blank
source
BLANK = ABLANK
BLANK = EBLANK
BLANK = 0V
BLANK = 4V @ IC output pin
The user must insure that the source of the
Blank
output is the same as the source for the RGB outputs,
i.e.
ABLANK
is selected when the auxiliary RGB is
active and
EBLANK
is selected when the encoder RGB
is active.
TV Composite Output
The device provides inputs for two composite video
sources that can be switched to the TV SCART
composite video pin,
TV_YCout.
The
Aux_YC
input pin
is typically connected to the “Video In” pin (pin 20) on
the auxiliary SCART connector. The
Enc_YC
input pin
is typically connected to the “YC” or “CVBS” output
from the external video encoder device. Selection of
the video source for the TV composite output is
accomplished when the RGB video source is selected
(see the register tables). When Register 1 is set to
xxxxx000, the Encoder input is selected and when set
to xxxxx001, the Auxiliary input is selected.
TV SVHS Output Mode
The device supports SVHS video format. The SVHS
mode is selected for the TV SCART using the lower
three (3) bits of Register 1(except for SVHS Enc 4
mode). When the SVHS mode is selected, the
TV_YCout
pin will provide the luminance signal output
from the selected source. The chroma output will be
provided on the
TV_R
pin. The video source for SVHS
mode can be either the auxiliary port or the encoder port.
When the auxiliary port is selected as the video source,
the video on
Aux_R
will be provided at the
TV_R
output
pin and the
Aux_YC
video will be provided at the
TV_YCout
pin.
The device will support SVHS mode for four encoder
interface formats. The first encoder interface format
accepts chroma signals on the
Enc_C
pin and
luminance signals on the
Enc_Y
pin. This is designated
"SVHS, Enc 1" mode. The second format will receive
chroma information on the
Enc_B
pin and luminance
information on
Enc_G.
This format is designated
"SVHS, Enc 2". The third format will receive chroma
information from the
Enc_R
pin and luminance
information from the
Enc_G
pin. This mode is
designated “SVHS, Enc 3” on the serial port register
table. For these three modes, audio will come from the
Lin/Rin
inputs. The fourth format is designated "SVHS
Enc 4" (not available in the 48QFN package option). It is
selected by setting register one to xx110xxx. Chroma
information is received on the Enc2_C input pin.
Rev 2.1
DC Restore:
The device will generate a DC restore level
on each video output based on timing referenced to a
horizontal sync pulse. When the sync pulse is detected,
the DC restore circuit will act to position the blank level
to 1.2V at the respective RGB output pins and the
respective composite output pins (0.6V at the respective
RGB and composite video output load). The device can
be programmed to look for the horizontal sync pulse on
all of the RGB input pins or on the associated composite
video input pin (Aux_YC for the auxiliary port or
Enc_YC
for the external encoder). Bit 7 of Register 1 determines
the horizontal sync source. At power-up, this bit defaults
to a low (0) state, which programs the device to look for
sync detect on the RGB input signals. In this mode, the
device can detect a horizontal sync on any of the three
RGB input signals. When Bit 7 is set to a high (1) state,
the device will look for a sync detect from the signal on
either the
Aux_YC
or
Enc_YC
pin depending on which
source is selected.
Blanking:
The signal on the
Blank
output pin is
determined by the state of two MSBs in Register 2
according to the following table:
Page: 3 of 30
©
2008 TERIDIAN Semiconductor Corporation
AVPro® 5002R
Dual SCART A/V Switch
DATA SHEET
luminance is received on the
Enc2_Y
input pin. For this
mode only, audio will come from the
TV_Lin/TV_Rin
inputs, and the video will have chroma output on
Aux_Cout,
and luminance output on
Aux_YCout.
When the SVHS mode is selected, the DC restore on
the
TV_R
pin will average to approximately 1.7 VDC at
the output pin. The DC restore circuit will act to position
the blank level to 1.2V at the
TV_YCout
video output
pin. The
TV_G
and
TV_B
outputs will be set to 0 VDC
when the SVHS mode is active.
RF Modulator Output
The device provides an output,
Mod_YC,
to drive an
external RF modulator. The
Mod_YC
output is a unity
gain amplifier designed to drive a 1kΩ load or higher.
When the device is operating in the RGB mode, the
signal on the
Mod_YC
output will follow the same
source as the
TV_YCout
output.
When the device is in the SVHS mode, the
Mod_YC
output can be driven by several sources depending on
the SVHS video source. These various options are
detailed in the serial port register table.
One case that requires additional detail is the auxiliary
SVHS mode. In the SVHS mode, the
Aux_YC
video
input will only provide luminance information.
Composite video for the modulator output must be
generated by summing this luma information with the
chroma information from the auxiliary port. The input
pin labeled
Aux_Cin
is used for this purpose. The
Aux_Cin
input pin is AC coupled to the same source
that provides the input signal to
Aux_R.
An internal
summing node combines the video signal on
Aux_Cin
(chroma) with the video signal on
Aux_YC
(luma) to
generate a composite video signal. In the auxiliary
SVHS mode, this signal is provided at the
Mod_YC
pin.
TV Composite Video Mute
The TV composite video outputs can be muted by
programming the lower three (3) bits in Register 1. The
power-up default condition is xxxxx111, (Auxiliary RGB
source) which sets the TV composite video outputs to 0
VDC and switches the TV audio outputs to
Aux_Lin/Aux_Rin. Setting these bits to xxxxx110
(Encoder RGB source) will also mute the TV composite
video outputs and switch the TV audio outputs to
Lin/Rin.
Auxiliary Composite Output
Auxiliary SVHS Output Mode
In the SVHS mode, Pin 15 on the auxiliary SCART
connector provides chroma information. To support
this, the auxiliary port on the 5002R includes a chroma
input pin (Aux_Cin) that is externally AC coupled to Pin
15 on the auxiliary SCART connector.
The device also includes an output pin (Aux_Cout) that
provides a chroma output to Pin 15 (RED) on the
auxiliary SCART connector. When connected with the
Aux_R and Aux_Cin pins, this forms a bi-directional
port as shown in the diagram below:
AuxiliaryS
CART
Pin 15
Aux_Cout
Mux
75
Mux
Aux_R
Aux_Cin
Mux
BI-DIRECTIONAL PIN CIRCUIT
Using this configuration, the device will support SVHS
mode for four encoder interface formats. The first
encoder interface format will receive chroma information
from the
Enc_C
pin and luminance information from the
Enc_Y
pin. This format is designated “SVHS, Enc 1”.
The second format will receive chroma information on
the
Enc_B
input and luminance information on
Enc_G.
This format is designated "SVHS, Enc 2". The third
format will receive chroma information from the
Enc_R
pin and luminance information from the
Enc_G
pin. This
mode is designated “SVHS, Enc 3” on the serial port
register table. For these three modes, audio will come
from the
Lin/Rin
inputs. The fourth format is designated
"SVHS Enc 4" (not available in the 48 QFN option).
Chroma information is received on the
Enc2_C
input pin
and the luminance is received on the
Enc2_Y
input pin.
For this mode only, audio will come from the
TV_Lin/TV_Rin
inputs.
When the SVHS mode is selected, the DC restore on
the
Aux_Cout
pin will average to approximately 1.7
VDC at the pin (0.85 at the video output load). The DC
restore on the
Aux_YCout
pin will set the blank level to
1.2 V at the IC pin or approximately 0.6 V across the
video output load.
The auxiliary port includes a composite video output
pin (AUX_YCout) that is typically connected to the
“Video Out” pin (pin 19) on an auxiliary SCART
connector. Bits 3-5 in Register 1 determine the
source for the
AUX_YCout
pin as well as for the
Aux_Cout.
See register table.
Page: 4 of 30
©
2008 TERIDIAN Semiconductor Corporation
Rev 2.1
AVPro® 5002R
Dual SCART A/V Switch
DATA SHEET
The RGB mode of operation requires special
consideration. The output driver on the Aux_Cout pin
acts as part of the load for the RED signal on pin 15 of
the SCART connector. Register 1 must be set to
x0011001 to select the auxiliary SCART as the RGB
source for the TV outputs and selects the external
video encoder as the source for the Auxiliary SCART
connector. This provides an output impedance of
about 0Ω on the Aux_Cout pin. This setting also allows
the Enc_C pin to pass through the Aux_Cout pin.
Due
to this, the outputs of the external video encoder
must be disabled to prevent corruption of the
incoming RED video signal.
Auxiliary Video Mute
All auxiliary video outputs can be simultaneously disabled
by programming Bits 3-5 in Register 1. The power-up
default condition is xx111xxx, which sets all auxiliary video
outputs to 0 VDC and switches the auxiliary audio outputs
to
Lin/Rin.
Function Switching
The device provides functions switching pins for both the
Auxiliary (Aux_Fnc) and TV (TV_Fnc) SCART ports. Both of
these pins are bi-directional. The direction of the pins is
determined by setting bits in Register 2 according to the
following table:
Bits
xxxx00xx
xxxx01xx
xxxx10xx
xxxx11xx
Aux_Fnc
output
output
input
Passthru I/O
TV_Fnc
output
input
output
Passthru O/I
TV_Fnc
pin as an output, or vice versa. This mode is
useful when the rest of the system powers down and all
signals from the auxiliary port are passed directly through to
the TV port, or vice versa.
When a function pin is set as an input, the voltage on that pin
is applied to an internal comparator. The comparator senses
the voltage on the input pin and sets the two (2) LSBs in the
read register according to the following table:
Input voltage
< 2.0 V
4.5 to 7.0V
>9.5 V
Bits
xxxxxx00
xxxxxx01
xxxxxx10
Function
Normal TV
16:9 aspect
Peritelevision
When a function pin is set as an output, the output level
for the pin is determined by the state of the two LSBs in
Register 2, according to the following table:
Bits
xxxxxx00
xxxxxx01
xxxxxx10
xxxxxx11
Output voltage
~0 V
~6 V
~ 11 V
~ 11 V
Function
Normal TV
16:9 aspect
Peritelevision
Peritelevision
Note that both the
Aux_Fnc
pin and the
TV_Fnc
pin can
be set as outputs simultaneously, however they will have
the same output voltage.
The function output circuit includes short circuit protection.
When a function pin is in the 6V or 11V output mode, if the
SCART connection is shorted to ground, then the output is
disabled. Likewise, when a function pin is in the 0V output
mode, if the SCART connection is connected to a voltage
source, then the output is disabled. The load for the
function outputs is designed to be 10kΩ or higher.
For the case where Register 2 is set to xxxx11xx, the input
signal on the
Aux_Fnc
pin is passed directly through to the
Figure 2: 5002R Audio Switching Block Diagram
TV_Lin
Mux
Mux
Aux_Lout
Aux_Mono
TV_Rin
Mux
Mux
Aux_Rout
Mux
A
Lin
Aux_Lin
A
Rin
Aux_Rin
Mux
Mux
Mux
B
C
Mux
B
C
Mux
Lout
Mux
TV_Lout
Mod_Mono
TV_Rout
Mux
Rout
A: DAC Input Gain (0, 6, 9, or 11.5dB)
B: Volume Control Gain (0 or 6dB)
C: Volume Control Attenuation (0 to –63 dB in –1dB steps)
Page: 5 of 30
©
2008 TERIDIAN Semiconductor Corporation
Rev 2.1
工业自动化与控制
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