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ssm2164_getting_started [2018/04/26 17:03] phatline [Class A] |
ssm2164_getting_started [2018/04/26 17:05] phatline [Class AB] |
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SSM2164 Pin 1 (the first pin) sets the "Mode" | SSM2164 Pin 1 (the first pin) sets the "Mode" | ||
==== Class AB ==== | ==== Class AB ==== | ||
- | Pin is Open, no Resistor to +12V (PCB Default)\\ | + | Pin 1 is Open, no Resistor to +12V (PCB Default)\\ |
Lower current results in higher distortion/lower noise.\\ | Lower current results in higher distortion/lower noise.\\ | ||
==== Class A ==== | ==== Class A ==== | ||
- | Pin is Connected to +12V via a Resistor\\ | + | Pin 1 is Connected to +12V via a Resistor\\ |
Higher current results in lower distortion/higher noise\\ | Higher current results in lower distortion/higher noise\\ | ||
lets look in the datasheet:\\ | lets look in the datasheet:\\ | ||
{{:phatline:ssm2164-ab-a.png?600|}}\\ | {{:phatline:ssm2164-ab-a.png?600|}}\\ | ||
Figures 11 and 12 show the THD and noise performance of the | Figures 11 and 12 show the THD and noise performance of the | ||
- | SSM2164 as the bias current is adjusted. Notice the two | + | SSM2164 as the bias current is adjusted\\ |
- | characteristics have an inverse characteristic.\\ | + | |
- | The quiescent current in the core is set by adding a single | + | |
- | resistor from the positive supply to the MODE pin.\\ the formula for the | + | |
- | MODE current is:\\ | + | |
I_MODE = ( (V+)−0.6V )/ RB\\ | I_MODE = ( (V+)−0.6V )/ RB\\ | ||
1,52mA = (12V-0.6V) / 7,5K\\ | 1,52mA = (12V-0.6V) / 7,5K\\ | ||
Leaving the MODE pin open sets the SSM2164 in Class AB with 30 μA in the Gain-Core\\ | Leaving the MODE pin open sets the SSM2164 in Class AB with 30 μA in the Gain-Core\\ |