In my design, I am using an audio codec, but not all analog audio i/o channels and digital (I2S) signal pins are used. What should I do with the pins that I am not using?
AD1933
Production
The AD1933 is a high performance, single chip that provides
eight digital-to-analog converters (DACs) with differential
output using the Analog Devices...
Datasheet
AD1933 on Analog.com
ADAU1361
Production
The ADAU1361 is a low power, stereo audio codec that supports stereo 48 kHz record and playback at 14 mW from a 1.8 V analog supply. The stereo audio ADCs...
Datasheet
ADAU1361 on Analog.com
ssm2603
Production
The SSM2603 is a low power, high quality stereo audio codec for portable digital audio applications with one set of stereo programmable gain amplifier...
Datasheet
ssm2603 on Analog.com
AD1936
Obsolete
The AD193X family are high performance, single-chip CODECs that provide 4 ADCs with differential input and 8 DACs with either single-ended or differential...
Datasheet
AD1936 on Analog.com
AD1938
Production
The AD1938 is a high performance, single-chip codec that provides four analog-to-digital converters (ADCs) with input and eight digital-to-analog converters...
Datasheet
AD1938 on Analog.com
AD1934
Production
The AD1934 is a high performance, single chip that provides eight digital-to-analog converters (DACs) with single-ended output using the Analog Devices...
Datasheet
AD1934 on Analog.com
ADAU1373
Obsolete
The ADAU1373 is a low power, stereo audio codec with integrated digital audio processing that supports stereo 48 kHz record and playback. The stereo audio...
Datasheet
ADAU1373 on Analog.com
AD1939
Production
The AD1939 is a high performance, single-chip codec that provides four analog-to-digital converters (ADCs) with differential input, and eight digital-to...
Datasheet
AD1939 on Analog.com
ADAU1961
Production
The ADAU1961 is a low power, stereo audio codec that supports stereo 48 kHz record and playback at 35 mW from a 3.3 V analog supply. The stereo audio ADCs...
Datasheet
ADAU1961 on Analog.com
ADAU1966
Not Recommended for New Designs
The ADAU1966 is a high performance, single-chip DAC that
provides 16 digital-to-analog converters (DACs) with differential
output using the Analog Devices...
Datasheet
ADAU1966 on Analog.com
AD1974
Production
The AD1974 is a high performance, single-chip ADC that provides four analog-to-digital converters (ADCs) with differential inputs using the Analog Devices...
Datasheet
AD1974 on Analog.com
AD1937
Production
The AD1937 is a high performance, single-chip codec that provides four analog-to-digital converters (ADCs) with differential input and eight digital-to...
Datasheet
AD1937 on Analog.com
ssm2604
Production
The SSM2604 is a low power, high quality stereo audio codec for portable digital audio applications with one set of stereo programmable gain amplifier...
Datasheet
ssm2604 on Analog.com
In my design, I am using an audio codec, but not all analog audio i/o channels and digital (I2S) signal pins are used. What should I do with the pins that I am not using?
There separate rules to follow for unused analog audio and digital audio pins:
Analog audio input pins (i.e. inputs to the ADCs) that are not being used should be connected to the common mode pin or filter.
Analog audio output pins (i.e. outputs from the DACs) should be left unconnected (NC).
Digital audio input pins (i.e. I2S port pins: BCLK_IN, LRCLK_IN, SDATA_IN) should be connected to GND.
Digital audio output pins (i.e. I2S port pins: BCLK_OUT, LRCLK_OUT, SDATA_OUT) should be left unconnected (NC).
If an MCLKI (master clock input) pin is not used, it can be connected to GND.
If the MCLKO (master clock output) pin is not used, it should be left unconnected; typically, the MCLKO pin can also be shut off in the chip's control registers.
In the case of the AD193x family, any unused ADC analog input ports should be connected directly to the CM pin, along with the recommended decoupling capacitors. If an ADC port is being driven with a single-ended source, the unused pin of the differential input should be AC coupled to ground with a 10 uF capacitor.
