ssm2164_getting_started
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ssm2164_getting_started [2018/04/26 16:56] phatline [MODE Resistor - Noise vs Distortion] |
ssm2164_getting_started [2018/04/26 17:08] phatline [Class AB] |
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| Line 73: | Line 73: | ||
| 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.\\ | ||
| + | ---i do want distortion and dont care about noise--- so i do not change anything, the pcb is fine. | ||
| ==== 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?294|}}\\ | + | {{: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. As the | + | |
| - | simplified schematic shows, the potential at the MODE pin is | + | |
| - | one diode drop above the ground pin. Thus, the formula for the | + | |
| - | MODE current is: | + | |
| - | I | + | |
| - | MODE | + | |
| - | = | + | |
| - | ( | + | |
| - | V | + | |
| - | + | + | |
| - | ) | + | |
| - | − | + | |
| - | 0. 6 | + | |
| - | V | + | |
| - | R | + | |
| - | B | + | |
| - | With 15 V supplies, an RB of 7.5k gives Class A biasing with a current of 1.9 mA. Leaving the MODE pin open sets the SSM2164 in Class AB with 30 μA in the Gain-Core | + | |
| + | I_MODE = ( (V+)−0.6V )/ RB\\ | ||
| + | 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\\ | ||
ssm2164_getting_started.txt · Last modified: 2018/04/26 19:28 by phatline
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