The PCM1681 and PCM1681-Q1 are CMOS monolithic integrated circuits which feature an eight-channel 24-bit audio digital-to-analog converter (DAC) and support circuitry in small 28-lead TSSOP PowerPAD packages

PCM1681

Manufacturer Part NumberPCM1681
DescriptionThe PCM1681 and PCM1681-Q1 are CMOS monolithic integrated circuits which feature an eight-channel 24-bit audio digital-to-analog converter (DAC) and support circuitry in small 28-lead TSSOP PowerPAD packages
ManufacturerTexas Instruments
PCM1681 datasheet
 


Specifications of PCM1681

# Dacs8# Inputs / # Outputs0 / 8
ArchitectureCurrent Segment DACResolution(bits)24
Sampling Rate(max)(khz)200Control InterfaceSPI, I2C,H/W
Digital Audio InterfaceL,R,I2S,TDM,DSPThd+n(typ)(%)0.002
Dac Snr(typ)(db)105Power Consumption(typ)(mw)386
Operating Temperature Range(c)-40 to 85Analog Voltage Av/dd(min)(v)4.5
Analog Voltage Av/dd(max)(v)5.5Pin/package28HTSSOP
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REGISTER WRITE OPERATION
All write operations for the serial control port use 16-bit data words.
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
0
0 0
IDX6
IDX5
IDX4
IDX3
Register Index (or Address)
Figure 25. Control Data Word Format for MD
MS
MC
MD
X
0
IDX6
IDX5
IDX4
IDX3
Copyright © 2008, Texas Instruments Incorporated
Figure 25
IDX2
IDX1
IDX0
D7
D6
D5
D7
D6
D5
D4
IDX2
IDX1
IDX0
Figure 26. Write Operation Timing
Product Folder Link(s):
PCM1681 PCM1681-Q1
PCM1681
PCM1681-Q1
SLES211B – FEBRUARY 2008 – REVISED JUNE 2008
shows the control data word
LSB
D4
D3
D2
D1
D0
Register Data
R0001-01
D3
D2
D1
D0
X
X
0
IDX6
T0048-01
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