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| ADAU1979 Datasheet, PDF (20/44 Pages) Analog Devices – Quad Analog-to-Digital Converter (ADC) | |||
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ADAU1979
Connection Options
Figure 28 through Figure 32 show the available options for
connecting the serial audio port in I2S or TDM mode. In
TDM mode, it is recommended to include a pull-down resistor
on the data signal to prevent the line from floating when the
SDATAOUTx pin of the ADAU1979 becomes high-Z during an
inactive period. Select a resistor value such that no more than
2 mA is drawn from the SDATAOUTx pin. Although the resistor
value is typically in the 10 k⦠to 47 k⦠range, the appropriate
resistor value depends on the devices on the data bus.
MASTER
SLAVE
ADAU1979
DSP
BCLK
LRCLK
SDATAOUT1
SDATAOUT2
Figure 28. Serial Port Connection Option 1âI2S/Left Justified/Right Justified
Modes, ADAU1979 Master
SLAVE
MASTER
ADAU1979
DSP
BCLK
LRCLK
SDATAOUT1
SDATAOUT2
Figure 29. Serial Port Connection Option 2âI2S/Left Justified/Right Justified
Modes, ADAU1979 Slave
MASTER
ADAU1979
SLAVE
DSP
BCLK
LRCLK
SDATAOUTx
SLAVE
ADAU1979
OR
SIMILAR ADC
BCLK
LRCLK
SDATAOUTx
Figure 30. Serial Port Connection Option 3âTDM Mode, ADAU1979 Master
SLAVE
ADAU1979
BCLK
LRCLK
SDATAOUTx
Data Sheet
SLAVE
DSP
MASTER
ADAU1979
OR
SIMILAR ADC
BCLK
LRCLK
SDATAOUTx
Figure 31. Serial Port Connection Option 4âTDM Mode, Second ADC Master
SLAVE
ADAU1979
MASTER
DSP
BCLK
LRCLK
SDATAOUTx
SLAVE
ADAU1979
OR
SIMILAR ADC
BCLK
LRCLK
SDATAOUTx
Figure 32. Serial Port Connection Option 5âTDM Mode, DSP Master
Rev. 0 | Page 20 of 44
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