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PCM1717E-3G4 Datasheet(PDF) 8 Page - Texas Instruments |
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PCM1717E-3G4 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 17 page  ® 8 PCM1717 OPERATIONAL CONTROL PCM1717 can be controlled in two modes. Software Mode allows the user to control operation with a 16-bit serial register. Hardware Mode allows the user to hard-wire opera- tion of PCM1717 using four parallel wires. The MODE pin determines which mode PCM1717 is in; a LOW level on pin 14 places PCM1717 in Hardware Mode, and a HIGH on pin 14 places PCM1717 in Software Mode. MODE (Pin 14) Selected Mode Pin 16 Pin 17 Pin 18 “HIGH” Software Mode MD MC ML “LOW” Hardware Mode DM0 DM1 MUTE Table I indicates which functions are selectable within the user’s chosen mode. All of the functions shown are select- able in the Software Mode, but only soft mute and de- emphasis control may be selected in the Hardware Mode. DIGITAL DE-EMPHASIS (Pins 16 and 17) Pins 16 and 17 are used as a two-bit parallel register to control de-emphasis modes: PIN 16 PIN 17 MODE 0 0 De-emphasis disabled 1 0 De-emphasis enabled at 48kHz 0 1 De-emphasis enabled at 44.1kHz 1 1 De-emphasis enabled at 32kHz RESET MODE (Pin 15) A LOW level on pin 15 will force the digital filters, modu- lators and mode controls into a reset (disable) mode. While this pin is held low, the output of PCM1717 will be forced to VCC/2 (Bipolar Zero). Bringing pin 15 HIGH will initial- ize all DAC functions, and allow for normal operation. SOFTWARE MODE (Pin 14 = “1”) The Software Mode uses a three-wire interface on pins 16, 17 and 18. Pin 17 (MC) is used to clock in the serial control data, pin 18 (ML) is used to synchronize the serial control data, and pin 16 (MD) is used to latch in the serial control register. There are four distinct registers, with bits 9 and 10 (of 16) determining which register is in use. REGISTER CONTROL (Bits 9, 10) REGISTER B9 (A0) B10 (A1) 000 110 201 311 Control data timing is shown in Figure 6. ML is used to latch the data from the control registers. After each register’s contents are checked in, ML should be taken low to latch in the data. A “res” in the register indicates that location is reserved for factory use. When loading the registers, the “res” bits should be set LOW. REGISTER 0 Register 0 is used to control left channel attenuation. Bits 0-7 (AL0-AL7) are used to determine the attenuation level. The level of attenuation is given by: ATT = [20log10 (ATT_DATA/255)] dB B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 res res res res res A1 A0 LDL AL7 AL6 AL5 AL4 AL3 AL2 AL1 AL0 TABLE I. Feature Selections by Mode. SOFTWARE HARDWARE MODE DEFAULT MODE DEFAULT FUNCTION SELECTABLE SELECTABLE Input Data Format Yes No Normal Format Normal Normal Only Normal I2S Format Input Resolution Yes No 16 Bits 16 Bits 16 Bits Only 16 Bits 18 Bits LRCIN Polarity Yes No L/R = High/Low L/R = H/L L/R = H/L L/R = H/L L/R = Low/High Only De-emphasis Control Yes Yes 32kHz 44.1kHz OFF OFF 48kHz OFF Soft Mute Yes OFF Yes OFF Digital Attenuation Yes 0dB No 0dB Analog Output Mode Yes Stereo No Stereo Infinite Zero Detection Yes Disabled No Disabled DAC Operation Control Yes ON No ON HARDWARE MODE (Pin 14 = “0”) This mode is controlled by logic levels present on pins 15, 16, 17 and 18. Hardware Mode allows for control of soft mute, digital de-emphasis and disable ONLY. Other func- tions such as attenuation, I/O format and infinite zero detect can only be controlled in the Software Mode. SOFT MUTE (Pin 18) A LOW level on pin 18 will force both channels to be muted; a HIGH level on pin 18 will allow for normal operation. Not Recommended for New Designs |
Similar Part No. - PCM1717E-3G4 |
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Similar Description - PCM1717E-3G4 |
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