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5002R Datasheet(PDF) 6 Page - Teridian Semiconductor Corporation |
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5002R Datasheet(HTML) 6 Page - Teridian Semiconductor Corporation |
6 / 30 page AVPro® 5002R Dual SCART A/V Switch DATA SHEET Page: 6 of 30 © 2008 TERIDIAN Semiconductor Corporation Rev 2.1 SCART Audio Switching The audio inputs are considered to be associated with the respective video inputs. As a result, the video selection determines which audio signals will be switched to a given SCART output. Refer to the serial port register table for more information. Also see the audio switching block diagram shown in Figure 2. The 5002R provides inputs for the auxiliary audio source (Aux_Lin/Aux_Rin), a stereo DAC associated with the video encoder inputs (Lin/Rin), and inputs from the TV SCART (TV_Lin/TV_Rin). TV Audio Operation The audio source for the TV port is selected in concert with the video source using the three (3) LSBs of Register 1. The selected audio signals are input to internal multiplexers that allow the user to select between mono and stereo output options. Bits 4 and 5 of Register 3 control the stereo/mono selection according to the following table: Bit 1 Bit 0 TV left source TV right source 0 0 left input right input 0 1 left + right left + right 1 0 left input left input 1 1 right input right input At power-up, these bits default to 00 putting the device in the stereo mode. Volume Control: The left and right TV audio channels can be selected to pass through volume control circuits. Each volume control circuit is formed by a serially connected amplifier and attenuator pair. The amplifier is programmed by register 4, bit 2( “0” for 0 dB and “1” for 6 dB gains ). The attenuator is programmed by the lower 6 bits of register 0( “xx000000” for 0 dB and “xx111111” for –63 dB attenuation, in –1 dB steps ). DAC Input Gain (Lin/Rin): To support audio DACs that have a limited output range, the 5002R provides programmable gain amplifiers on the Lin and Rin inputs. The gain is set by Bits 2 and 3 of Register 3, according to the following table: Bit 3 Bit 2 Gain 0 0 1 1 0 1 0 1 Gain = 0 dB Gain = 6 dB Gain = 9 dB Gain = 11.5 dB TV SCART Audio Outputs: The first pair of signals is labeled TV_Lout and TV_Rout on the block diagram. TV_Lout and TV_Rout are typically used to drive the TV SCART audio pins. These outputs also have an internal multiplexer that allows the user to select TV audio either before or after the internal volume control function. When Bit 0 in Register 4 is set low (0), the volume control is used. When this bit is set high (1), the volume control is bypassed. The power-up default state is volume control active. TV Audio Line Outputs: The second pair of signals is labeled Lout and Rout on the block diagram. Lout and Rout are standard line outputs. The Lout/Rout outputs have an internal multiplexer that allows the user to select TV audio either before or after the internal volume control function. When Bit 1 in Register 4 is set low (0), the volume control is used. When this bit is set high (1), the volume control is bypassed. The power-up default state is volume control active. In addition, the audio inputs from the TV SCART connector (TV_Lin/TV_Rin) can be switched to the line outputs. This is controlled by bit-3 of Register 4. Setting this bit low (0) is the normal operation where the line outputs follow the TV SCART outputs. Setting this bit high (1) will switch the line outputs to the audio source on the TV_Lin/TV_Rin inputs. RF Mono Output: The TV_Lout and TV_Rout signals are also summed internally to generate a mono audio signal for an external RF modulator. This output is labeled Mod_Mono. The internal summing circuit is after the volume control mux so the audio control on this output will be the same as that selected for the TV_Lout and TV_Rout outputs. TV Audio Mute: A mute function is provided for all TV audio outputs. The mute function is controlled by setting Bit 6 in Register 0. When this bit is set to a high state (1), all TV audio outputs are muted. This will be the default condition at power-up. When the bit is set to a low state (0), the audio path will be in normal operating mode. This bit can be set independent of the volume control such that the outputs can be muted before any change in volume, or any switching of audio sources. |
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