PCM1681PWPR Datasheet, PDF (21/43 Pages) Texas Instruments – 24-Bit, 192-kHz Sampling, Enhanced Multilevel Delta-Sigma, Eight-Channel Audio Digital-to-Analog Converter

PCM1681
PCM1681-Q1
www.ti.com.................................................................................................................................................... SLES211B – FEBRUARY 2008 – REVISED JUNE 2008
REGISTER WRITE OPERATION
All write operations for the serial control port use 16-bit data words. Figure 25 shows the control data word
format. The most significant bit is a fixed 0 for the write operation. Seven bits, labeled IDX[6:0], set the register
index (or address) for the write operation. The least significant eight bits, D[7:0], contain the data to be written to
the register specified by IDX[6:0].
Figure 26 shows the functional timing diagram for writing to the serial control port. MS is held at a logic-1 state
until a register needs to be written. To start the register write cycle, MS is set to logic-0. 16 clock cycles are then
provided on MC, corresponding to the 16 bits of the control data word on MD. After completion of the 16th clock
cycle, MS is set to logic-1 to latch the data into the indexed mode control register.
MSB
LSB
0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 D7 D6 D5 D4 D3 D2 D1 D0
Register Index (or Address)
Register Data
Figure 25. Control Data Word Format for MD
R0001-01
MS
MC
MD
X 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 D7 D6 D5 D4 D3 D2 D1 D0 X X 0 IDX6
Figure 26. Write Operation Timing
T0048-01
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