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DF1706 Datasheet(PDF) 10 Page - Texas Instruments |
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DF1706 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 21 page DF1706 10 SBAS182 PIN PIN NAME NUMBER DESCRIPTION RSV 13 Reserved, Not Used LRIP 12 LRCIN Polarity LRIP = H: LRCIN= H = Left Channel, LRCIN= L = Right Channel LRIP = L: LRCIN= L = Left Channel, LRCIN = H = Right Channel CKO 11 CLKO Output Frequency CKO = H: CLKO Frequency = XTI/2 CKO = L: CLKO Frequency = XTI MUTE 15 Soft Mute Control: H = Mute Off, L = Mute On I2S 3 Input Data Format Controls IW0 4 IW1 5 I2S IW1 IW0 INPUT FORMAT L L L 16-Bit, Standard, MSB-First, Right-Justified L L H 20-Bit, Standard, MSB-First, Right-Justified L H L 24-Bit, Standard, MSB-First, Right-Justified L H H 24-Bit, MSB-First, Left-Justified H L L 16-Bit, I2S H L H 24-Bit, I2S SRO 27 Digital Filter Roll-Off: H = Slow, L = Sharp OW0 19 Output Data Word Length Controls OW1 20 OW1 OW0 OUTPUT FORMAT L L 16-Bit, MSB-First L H 18-Bit, MSB-First H L 20-Bit, MSB-First H H 24-Bit, MSB-First SF0 17 Sample Rate Selection for the Digital De-Emphasis Control SF1 18 SF1 SF0 SAMPLING RATE L L 44.1kHz L H Reserved, Not Used H L 48kHz H H 32kHz DEM 16 Digital De-Emphasis: H = On, L = Off x4 21 Oversampling Rate Control: H = 4fS, L = 8fS TABLE IV. Hardware Mode Controls. RESET SOFTWARE HARDWARE DEFAULT FUNCTION (MODE = H) (MODE = L) (Software Mode) Input Data Format Selection O O Standard Format Input Word Length Selection O O 16 Bits Output Word Length Selection O O 16 Bits LRCIN Polarity Selection O O Left/Right = High/Low Digital De-Emphasis O O OFF Over Sample Ratio Control O O 8x Soft Mute O O OFF Digital Attenuation O X 0dB, Independent L/R Sample Rate for De-Emphasis Function O O 44.1 kHz Filter Roll-Off Selection O O Sharp Roll-Off Selected CLKO Output-Frequency Selection O O Same As XTI Input Legend: O = User Programmable, X = Not Available. TABLE III. User-Programmable Functions for Software and Hardware Mode. Programmable Functions The DF1706 includes a number of programmable features, with most being accessible from either Hardware or Soft- ware mode. Table III summarizes the user-programmable functions for both modes of operation. Hardware Mode Controls With MODE = L, the DF1706 may be configured by utilizing several user-programmable pins. The following is a brief summary of the pin functions. Table IV provides more details on setting the hardware mode controls. Pins I2S, IW0, and IW1 are used to select the audio data input format and word length. Pins OW0 and OW1 are used to select the output data word length. The DEM pin is used to enable and disable the digital de- emphasis function. De-emphasis is only available for 32kHz, 44.1kHz, and 48kHz sample rates. Pins SF0 and SF1 are used to select the sample rate for the de-emphasis function. The SRO pin is used to select the digital filter response, either sharp or slow roll-off. Generally, sharp roll-off filter is used. The MUTE pin is used to enable or disable the soft mute function. The CKO pin is used to select the clock frequency seen at the CLKO pin, either XTI or XTI ÷ 2. The LRIP pin is used to select the polarity used for the audio input left/right clock, LRCIN. The x4 pin is used to control the over sampling ratio of the internal digital filter, either a 8x or 4x. For instance, when fs is 192kHz or 176.4kHz, the over sampling ratio should be 4x. Finally, the RESV pin is not used by the current DF1706 design, but is reserved for future use. Software Mode Controls With MODE = H, the DF1706 may be configured by programming four internal registers in software mode. ML (pin 13), MC (pin 12), and MD (pin 11) make up the 3-wire software control port, and may be controlled using DSP or microcontroller general purpose I/O pins, or a serial port. Table V provides an overview of the internal registers, labeled MODE0 through MODE3 (see Table V). See Figures 8 through 10 for more details regarding the control port data format and timing requirements. The data format for the control port is 16-bit, MSB-first, with Bit B15 being the MSB. Register Addressing A[1:0], bits B10 and B9 of the 16-bit control data word, are used to indicate the register address to be written to by the current control port write cycle. See Table VI for how to address the internal registers using bits A[1:0] of registers MODE0 through MODE3. |
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