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AD1849 Scheda tecnica(PDF) 11 Page - Analog Devices |
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AD1849 Scheda tecnica(HTML) 11 Page - Analog Devices |
11 / 28 page AD1849K REV. A –11– CONTROL REGISTERS The AD1849K SoundPort Stereo Codec accepts control information through its serial port when in Control Mode. Some control information is also embedded in the data stream when in Data Mode. (See Figure 8.) Control bits can also be read back for system verification. Operation of the AD1849K is determined by the state of these control bits. The 64-bit serial Control Mode and Data Mode control registers have been arbitrarily broken down into bytes for ease of description. All control bits initialize to default states after RESET or Power Down. Those control bits that cannot be changed in Control Mode are initialized to defaults on the transition from Data Mode to Control Mode. See below for a definition of these defaults. Control Mode Control Registers Control Byte 1, Status Register Data 7 Data 6 Data 5 Data 4 Data 3 Data 2 Data 1 Data 0 001 MB O L B DCB 0 AC 63 62 61 60 59 58 57 56 MB Mic bypass: 0 Mic inputs applied to 20 dB fixed gain block. 1 Mic inputs bypass 20 dB fixed gain block. OLB Output level bit: 0 Full-scale line 0 output is 2.8 V p-p (1 V rms). Full-scale line 1 output is 4.0 V p-p. Full-scale mono speaker output is 8.0 V p-p. 1 Full-scale line 0 output is 2.0 V p-p. Full-scale line 1 output is 2.0 V p-p. Full-scale mono speaker output is 4.0 V p-p. DCB Data/control bit. Used for handshaking in data/control transitions. See “DCB Handshake Protocol.” AC Autocalibration. Autocalibration will always occur on the Control-to-Data mode transition. The AC bit is ignored. Autocalibration requires an interval of 194 frames. Offsets for all channels of ADC and DAC are zeroed. The user should specify that analog outputs are muted to prevent undesired outputs, i.e., OM0 = “0,” OM1 = “0,” and SM =“0.” Monitor mix will be automatically disabled by the Codec. |
Codice articolo simile - AD1849_15 |
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Descrizione simile - AD1849_15 |
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