Hi all,
I'm trying to design a pcb for CS5381 saved from a broken soundcard. Previous attempt with a CS4272 was successful and this one looks similar, however there are a few pins that datasheet doesn't make it clear how to configure, so I could use your help with this.
1. Pin#12 I2S/LJ. I want I2S. I think it should go to VDD. Is this correct and does it need a pull up resistor?
2. Pin#2 M/S. I want slave mode. So, connect to ground? Pull down resistor necessary?
3. Pin#11 HPF. Low pass filter for DC offset correction. Unless you suggest otherwise, I don't need it for one ADC, one source application. Where to
connect it and how?
Also, I have a question about the low value resistors typically found in series with the I2S lines. I haven't used any with CS4272 with no obvious problems. Are these mandatory? I'm using them with DAC chips and there will be one on board for that matter. Could both ADC and DAC share the same resistors?
Attached CS5381 datasheet and pin out diagram.
I'm trying to design a pcb for CS5381 saved from a broken soundcard. Previous attempt with a CS4272 was successful and this one looks similar, however there are a few pins that datasheet doesn't make it clear how to configure, so I could use your help with this.
1. Pin#12 I2S/LJ. I want I2S. I think it should go to VDD. Is this correct and does it need a pull up resistor?
2. Pin#2 M/S. I want slave mode. So, connect to ground? Pull down resistor necessary?
3. Pin#11 HPF. Low pass filter for DC offset correction. Unless you suggest otherwise, I don't need it for one ADC, one source application. Where to
connect it and how?
Also, I have a question about the low value resistors typically found in series with the I2S lines. I haven't used any with CS4272 with no obvious problems. Are these mandatory? I'm using them with DAC chips and there will be one on board for that matter. Could both ADC and DAC share the same resistors?
Attached CS5381 datasheet and pin out diagram.
1. For I2S tie pin 12 to VDD. No need for pull up resistor.
2. Tie pin 2 to GND. No pull down resistor needed.
3. Tie pin 11 to VDD for no HPF. No pull up resistor needed.
Or you could add a pin header for setting all above with jumpers. For that you would need pull up or pull down resistors on each line.
Series termination resistors should be connected close to the source. In slave mode only SDOUT is output so you should add a resistor on that signal. Series termination resistors are not mandatory but are useful for mitigating overshoots or even for fine tuning timings.
2. Tie pin 2 to GND. No pull down resistor needed.
3. Tie pin 11 to VDD for no HPF. No pull up resistor needed.
Or you could add a pin header for setting all above with jumpers. For that you would need pull up or pull down resistors on each line.
Series termination resistors should be connected close to the source. In slave mode only SDOUT is output so you should add a resistor on that signal. Series termination resistors are not mandatory but are useful for mitigating overshoots or even for fine tuning timings.
