5002R Datasheet, PDF (4/30 Pages) Teridian Semiconductor Corporation – Dual SCART A/V Switch

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
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.
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
75
Aux_R
Aux_Cin
Mux
Mux
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.
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© 2008 TERIDIAN Semiconductor Corporation
Rev 2.1