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AD1853 Scheda tecnica(PDF) 10 Page - Analog Devices |
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AD1853 Scheda tecnica(HTML) 10 Page - Analog Devices |
10 / 16 page REV. A AD1853 –10– Control Register The following table shows the functions of the control register. The control register is addressed by having a “01” in the bottom 2 bits of the 16-bit SPI word. The top 14 bits are then used for the control register. Bit 11 Bit 10 Bit 9:8 Bit 7 Bit 6 Bit 5:4 Bit 3:2 INT2 × Mode INT4 × Mode Number of Soft Reset. Soft Mute OR’d Serial Mode OR’d De-Emphasis Filter OR’d with Pin. OR’d with Pin. Bits in Right- Default = 0 with Pin. with Mode Pins. Select. Default = 0 Default = 0 Justified Serial Default = 0 IDPMI:IDPM0 0:0 No Filter Mode. 0:0 Right-Justified 0:1 44.1 kHz Filter 0:0 = 24 0:1 I 2S 1:0 32 kHz Filter 0:1 = 20 1:0 Left-Justified 1:1 48 kHz Filter 1:0 = 16 1:1 DSP Mode Default = 0.0 Default = 0:0 Default = 0:0 Mute The AD1853 offers two methods of muting the analog output. By asserting the MUTE (Pin 23) signal HI, both the left and right channel are muted. As an alternative, the user can assert the mute bit in the serial control register (Bit 6) HI. The AD1853 has been designed to minimize pops and clicks when muting and unmuting the device by automatically “ramping” the gain up or down. When the device is unmuted, the volume returns to the value set in the volume register. Analog Attenuation The AD1853 also offers the choice of using IREF (Pin 10) to attenuate by up to 50 dB in the analog domain. This feature can be used as an analog volume control. It is also a convenient place to add a compressor/limiter gain control signal. Output Drive, Buffering and Loading The AD1853 analog output stage is able to drive a 1 k Ω (in series with 2 nF) load. The analog outputs are usually ac coupled with a 10 µF capacitor. De-Emphasis The AD1853 has a built-in de-emphasis filter that can be used to decode CDs that have been encoded with the standard “Redbook” 50 µs/15 µs emphasis response curve. Three curves are available; one each for 32 kHz, 44.1 kHz and 48 kHz sam- pling rates. The external “DEEMP” pin (Pin 9) turns on the 44.1 kHz de-emphasis filter. The other filters may be selected by writing to control Bits 2 and 3 in the control register. If the SPI port is used to control the de-emphasis filter, the external DEEMP pin should be tied LO. Control Signals The IDPM0 and IDPM1 control inputs are normally con- nected HI or LO to establish the operating state of the AD1853. They can be changed dynamically (and asynchronously to LRCLK and the master clock), but it is possible that a click or pop sound may result during the transition from one serial mode to another. If possible, the AD1853 should be placed in mute before such a change is made. Figures 9–14 show the calculated frequency response of the digital interpolation filters. Figures 15–27 show the performance of the AD1853 as measured by an Audio Precision System 2 Cascade. For the wideband plots, the noise floor shown in the plots is higher than the actual noise floor of the AD1853. This is caused by the higher noise floor of the “High Bandwidth” ADC used in the Audio Precision measurement system. The two-tone test shown in Figure 18 is per the SMPTE standard for measur- ing Intermodulation Distortion. FREQUENCY – kHz 0.001 0 210 12 14 16 20 0.0008 0.0006 0.0004 0.0002 0 –0.0002 –0.0004 –0.0006 –0.0008 –0.001 46 8 18 Figure 9. Passband Response 8 × Mode, 48 kHz Sample Rate FREQUENCY – kHz 0 –60 –100 –160 –20 –40 –80 –120 –140 0 150 200 50 100 250 300 350 Figure 10. Complete Response, 8 × Mode, 48 kHz Sample Rate |
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