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PCM1712 Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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PCM1712 Datasheet(HTML) 10 Page - Burr-Brown (TI) |
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10 / 16 page  ® 10 PCM1712 SERIAL MODE PARALLEL MODE FUNCTION (MODE = H) (MODE = L) Input Data Format Selection 0 X (Normal Mode 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. FUNCTIONAL DESCRIPTION PCM1712 has several built-in functions including digital attenuation, digital de-emphasis and soft mute. These func- tions are software controlled. PCM1712 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 modes, mute, double-speed dubbing, input resolu- tion and input formats. PCM1712 can also be operated in parallel mode, where static control signals are used on pins 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 4 and 5 MUST be observed. MODE = H Serial Mode MODE = L Parallel Mode TABLE III. Serial and Parallel Mode are Selectable by MODE Pin (Pin 24). MODE CONTROL: SERIAL/PARALLEL SELECTION MODE CONTROL: SELECTABLE FUNCTIONS DIGITAL ATTENUATION One of the functions which can be implemented through use of the serial mode control is attenuation. This function allows the user to control the level of the output, indepen- dent of the input level set by the actual input data supplied to the DAC. Referring to Figure 5, when the first data bit (B0) on MD (pin 26) is low, the attenuation function is enabled. The next seven bits (B1 - B6) define a binary value, ATT_DATA, that indicates the desired level of attenuation. The attenuation level is given by: Level = 20log10 (1 - ATT_DATA/127) dB When all 7 bits of the ATT_DATA word are high (ATT_DATA = 127), attenuation is infinite and the output of PCM1712 will be zero. 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 DSD = H Normal Mode DSD = L Double Speed Dubbing Mode PARALLEL-MODE: DOUBLE-SPEED DUBBING CONTROL (PIN 24 [MODE] = L) TABLE VI. DSD (Pin 28). In the parallel mode, double-speed dubbing can be enabled by holding pin 28 (DSD) at logic “low”. SERIAL MODE CONTROL In order to use all of PCM1712’s functionality, the serial mode control should be used. PCM1712 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 PCM1712 in the serial mode. Internal latches are used to hold this serial data until the PCM1712 is enabled to use the data. The serial mode is used by applying clocked data to the following pins: TABLE IV. Selectable Functions in Serial Mode and Parallel Mode. 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 PCM1712 in the parallel mode. PARALLEL-MODE: DE-EMPHASIS CONTROL (PIN 24 [MODE] = L) DM1 (Pin 26) DM2 (Pin 27) De-emphasis L L OFF H L 32kHz L H 48kHz H H 44.1kHz 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 PCM1712, de-emphasis can operate at 32kHz, 44.1kHz, 48kHz, or disabled. |
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Similar Description - PCM1712 |
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