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TDA1315H データシート(PDF) 7 Page - NXP Semiconductors |
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TDA1315H データシート(HTML) 7 Page - NXP Semiconductors |
7 / 36 page 1995 Jul 17 7 Philips Semiconductors Product specification Digital audio input/output circuit (DAIO) TDA1315H FUNCTIONAL DESCRIPTION Modes of operation With respect to the control of the device and the exchange of non-audio data, a microcontroller (host) mode and a stand-alone mode can be considered. The selection of the mode is performed at pin CTRLMODE. In the stand-alone mode, the device configuration is solely determined by pins. In the host mode an internal control register, or pins or both can be used to change the default settings. With respect to the direction of the digital audio data, the device can be operated in either a transmit or a receive mode under control of a microcontroller. In the stand-alone mode the device is only a receiver. In the receive mode the input signal can also be made available at the output pin IECO (feed-through) to ease the cascading of digital audio equipment. The device can be brought to standby mode at all times by activating the PD pin (power down). In this mode all functions are disabled, all outputs 3-stated, supply current is minimized and the contents of the register are saved. General For those applications where it is important to save power, the PD pin is provided, which, when activated, puts the TDA1315H in standby mode by disabling all functions and 3-stating all outputs, while saving register contents. As illustrated in Fig.1, the TDA1315H contains the following major functional blocks: • IEC input section • Biphase demodulator • Frame and error detection • Clock and timing section • IEC output section • Biphase modulator • Audio section (I2S-bus transceiver) • Non-audio section (control and FIFO) • User (microcontroller) interface. IEC INPUT SECTION There are two biphase signal inputs to the IEC input section. IECIN0 accepts TTL levels from, for example, an optical input device, while IECIN1 is designed for coaxial cable inputs and requires signal levels of minimum 200 mV (p-p) via an external coupling capacitor. The selection of the active input channel is performed by pin IECSEL or by the control register or both. In the receive mode, the selected input signal is applied internally to the biphase audio output section to enable a feed-through function. BIPHASE DEMODULATOR In the biphase demodulator, the received signal (for details see Chapter “References”[1] and [2]) is converted to binary data and separated into audio and non-audio data for further processing in their dedicated sections. The demodulated input signal is also required for frame and error detection. FRAME AND ERROR DETECTION In the frame and error detection block, the framing information from the received biphase signal is retrieved to synchronize the biphase demodulator and to allow access to the audio and non-audio data bits. An out-of-lock condition of the PLL is flagged at UNLOCK. The validity of audio samples is indicated at pin INVALID. CLOCK AND TIMING SECTION In the clock and timing section, the timing information inherent to the received biphase signal is retrieved and a symmetrical master clock signal is generated and output at pin SYSCLKO. Depending on the mode of operation, the frequency of this master clock can be selected by pin CLKSEL, by the control register or both to be either 256fs or 384fs (fs = audio sampling frequency). This section contains all the circuitry of a Phase-Locked Loop (PLL), except for the loop filter components, which are connected externally to pins RCint and RCfil. When the input signal is interrupted, the oscillator will slowly drift to the centre frequency in order to keep the system operating on a proper frequency. In the transmit mode, all required timing signals are input at pin SYSCLKI and are derived from an externally supplied system clock of either 256fs or 384fs. The input HIGH time of that clock may be in the range between 30% to 70% of the clock period. IEC OUTPUT SECTION In the IEC output section, either the received (feed-through function) or the generated biphase signal is selected for output at pin IECO, depending on the receive/transmit mode. The output can be enabled/disabled by pin IECOEN, by the control register or both, and can drive a suitable optocoupler and a transformer in parallel. |
同様の部品番号 - TDA1315H |
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同様の説明 - TDA1315H |
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