參數(shù)資料
型號(hào)： PCM1807
英文描述： Single-Ended, Analog-Input 24-Bit, 96-kHz Stereo A/D Converter
中文描述： 單端模擬輸入24位，96千赫立體聲A / D轉(zhuǎn)換器
文件頁(yè)數(shù)： 22/29頁(yè)
文件大小： 426K
代理商： PCM1807
www.ti.com
SPI SERIAL CONTROL PORT FOR MODE CONTROL
The user-programmable built-in functions of the PCM1807 can be controlled through the serial control port with
SPI format. All operations for the serial control port use 16-bit data words.
Figure 28
shows the control data word
format. The most-significant bit must be set to 0. Seven bits, labeled IDX[6:0], set the register index (or address)
for the write operations. The least-significant eight bits, D[7:0], contain the data to be written to the register
specified by IDX[6:0].
MSB
0
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
D7
D6
D5
D4
D3
D2
D1
D0
LSB
Register Index (or Address)
Register Data
R0001-01
IDX0
D7
D6
D4
D5
D3
D2
D1
D0
0
MS
MC
MD
X
0
IDX6
X
IDX1
IDX2
IDX3
IDX4
IDX5
IDX6
X
T0048-03
PCM1807
SLES147–SEPTEMBER 2005
Figure 29
shows the functional timing diagram for writing to the serial control port. MS (pin 12) is held at a logic-1
state until a register is to be written. To start the register write cycle, MS is set to logic-0. Sixteen clocks are then
provided on MC (pin 11), corresponding to the 16 bits of the control data word on MD (pin 10). After the 16th
clock cycle has completed, the data is latched into the indexed-mode control register in the write operation. To
write subsequent data, MS must be set to 1 once.
Figure 28. Control Data Word Format for MD
Figure 29. Serial Control Format
22
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