AD1849K Analog Devices, AD1849K Datasheet - Page 11

• Manufacturer Part Number: AD1849K
• Description: Serial-Port 16-Bit SoundPort Stereo Codec
• Manufacturer: Analog Devices

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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
MB
OLB
DCB
AC
Data 7
Mic bypass:
Output level bit:
Data/control bit. Used for handshaking in data/control transitions. See “DCB Handshake Protocol.”
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.
63
0
0
1
0
1
Mic inputs applied to +20 dB fixed gain block.
Mic inputs bypass +20 dB fixed gain block.
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.
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.
Data 6
62
0
Data 5
61
1
Data 4
MB
60
–11–
Data 3
OLB
59
Data 2
DCB
58
Data 1
57
0
AD1849K
Data 0
AC
56