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PCM1710 Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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PCM1710 Datasheet(HTML) 10 Page - Burr-Brown (TI) |
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10 / 17 page  ® PCM1710U 10 FUNCTIONAL DESCRIPTION PCM1710 has several built-in functions including digital attenuation, digital de-emphasis and soft mute. These func- tions are software controlled. PCM1710 can be operated in two different modes, Serial or Parallel. Serial Mode is a three-wire interface using pin 26 (MD), pin 27 (MC), and pin 28 (ML). Data on these pins are used to control de-emphasis mode, mute, double-speed dubbing, input resolution and input format. PCM1710 can also be operated in parallel mode, where static control signals are used on pin 26 (DM1), pin 27 (DM2), and pin 28 (DSD). Operation of both of these modes are covered in detail in the next sections. CAUTION: Mode control signals operate on level triggered logic. The minimum timing conditions detailed in Figures 5 and 6 MUST be observed. DM1 (Pin 26) DM2 (Pin 27) De-emphasis L L OFF H L 32kHz L H 48kHz H H 44.1kHz PARALLEL-MODE: DE-EMPHASIS CONTROL (PIN 24 [MODE] = L) TABLE V. De-emphasis (Pins 26 and 27). In the parallel mode, de-emphasis conditions are controlled by the logic levels on pin 26 (DM1) and pin 27 (DM2). For PCM1710, de-emphasis can operate at 32kHz, 44.1kHz, 48kHz, or disabled. MODE CONTROL: SERIAL/PARALLEL SELECTION MODE = H Serial Mode MODE = L Parallel Mode TABLE III. Serial and Parallel Mode are Selectable by MODE Pin (Pin 24). MODE CONTROL: SELECTABLE FUNCTIONS TABLE IV. Selectable Functions in Serial Mode and Parallel Mode. SERIAL MODE PARALLEL MODE FUNCTION (MODE = H) (MODE = L) Input Data Format Selection 0 X(Normal Mode Fixed) Input Data Bit Selection 0 X(16-bit Fixed) Input LRCI Polarity Selection 0 X De-emphasis Control 0 0 Mute 0 0 Attenuation 0 X Double Speed Dubbing 0 0 NOTE: 0: Selectable, X: Not Selectable. Table IV indicates which functions are selectable within the user’s chosen mode. All of the functions shown are select- able within the serial mode, but only de-emphasis control, mute and double-speed dubbing may be selected when using PCM1710 in the parallel mode. PARALLEL-MODE: DOUBLE-SPEED DUBBING CONTROL (PIN 24 [MODE] = L) DSD = H Normal Mode DSD = L Double-Speed Dubbing Mode NOTE: When the Double-Speed Dubbing Mode is selected, the System Clock must be 384fs (CKSL: Pin 23 = H). TABLE VI. DSD (Pin 28). In the parallel mode, double-speed dubbing can be enabled by holding pin 28 (DSD) at a logic “low”. CAUTION: Double-speed dubbing cannot operate if the system clock is set at 256fs. SERIAL MODE CONTROL In order to use all of PCM1710’s functionality, the serial mode control should be used. PCM1710 must be addressed three separate times to set all of the various registers and flags that control these functions. Table VII together with Figure 6 details the control of the PCM1710 in the serial mode. Internal latches are used to hold this serial data until the PCM1710 is enabled to use the data. The serial mode is used by applying clocked data to the following pins: NAME PIN FUNCTION MC 27 Clock for Strobing in Data ML 28 Latches Data into the Registers MD 26 8-bit Data Word Defining Operation |
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Similar Description - PCM1710 |
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