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Part: 5002CL-CGT
Category:
Multimedia
-> Audio/Video
-> A/V Switches
Description: AVPro® - Dual Scart A/v Switche
Company: Teridian Semiconductor Corp. (TDK Semiconductor)
Datasheet: Download 5002CL-CGT datasheet File size : 150 kB
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®
TDK SEMICONDUCTOR CORP.
AVPro ® 5002CL Dual SCART A/V Switch
PRELIMINARY DATASHEET
January 2003
DESCRIPTION
The AVPro® 5002CL 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 137 loads. The audio outputs are buffered to provide 2 Vrms output into a 600 load. The 5002CL 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 -31 dB attenuation (1 dB step) - Programmable gain on DAC input channels - Ground based outputs (no AC coupling caps) · Serial port control of switching I2C bus · 64-lead LQFP package
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BLOCK DIAGRAM
VCC VCC VCC VCC VDD VEE VEE VEE
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
GND
AVPro® 5002CL Dual SCART A/V Switch
FUNCTIONAL DESCRIPTION
The 5002CL is an audio/video switching device. The device integrates both audio and video drivers so that it can directly drive the SCART interface. The use of a -5 volt supply eliminates the need for AC coupling capacitors on the audio outputs and the SCART audio inputs. Since the 5V supply biases the substrate of the device, the supplies sequencing should be such that the 5V supply turns on first and turns off last. All programmable functions of the device are controlled through a standard I2C 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 5002CL includes two programmable digital outputs and provides inputs for the TV SCART audio/video.
4V
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 1.83 V/V to allow for a series resistance of 62 ohms prior to the 75 ohm 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
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: 5002CL Video switching block diagram
2
AVPro® 5002CL Dual SCART A/V Switch
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 = 1.83 V/V = A0 Gain = A0 - 10% Gain = A0 - 20% Gain = A0 - 30%
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 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). 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". It is selected by setting register one to xx110xxx. 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, 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 1.8 VDC at the output pin. The DC restore circuit will act to position the blank level to 0.6 V at the TV_YCout video output 3
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 0.6 V at the respective 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:
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
AVPro® 5002CL Dual SCART A/V Switch
load. 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 1k 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, 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 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 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 pin. When these bits are set to xx000xxx, the video source will be the Enc_B input. When these bits are set to xx001xxx, the video source will be the Enc_YC input. When these bits are set to xx010xxx, the video source will be the TV_YCin input. 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 5002CL includes a chroma input pin (Aux_Cin) that is externally AC coupled to Pin 15 on the auxiliary SCART connector. 4 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 following diagram: 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
Aux_Cout Mux Aux_R Mux Aux_Cin Mux 62 Auxiliary SCART Pin 15
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". 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 0.9 VDC 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.
AVPro® 5002CL Dual SCART A/V Switch
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 the voltage on the input pin and sets the two (2) LSBs in the read register according to the following table: Input voltage 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
For the case where Register 2 is set to xxxx11xx, the input signal on the Aux_Fnc pin is passed directly through to the 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
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 10k or higher.
Figure 2: 5002CL 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 11.6dB) B: Volume Control Gain (0 or 6dB) C: Volume Control Attenuation (0 to 31 dB in 1dB steps) 5
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