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--- ssm2164_getting_started [2018/04/26 16:14]
phatline [ssm2164_seppoman pcb introduction]
+++ ssm2164_getting_started [2018/04/26 17:08]
phatline [Class AB]
@@ Line 67: / Line 67: @@
 **Pro:** preserve the "just change the jumpers if you need some channel in bipolar mode" thought behind this option.\\
 **Con:**dramatically increase the calibration range, i.e. exactly calibrating the outputs will get harder because the same angle of turning the pot will have much more impact.\\
+====== MODs ======
+===== MODE Resistor - Noise vs Distortion =====
+SSM2164 Pin 1 (the first pin) sets the "Mode"
+==== Class AB ====
+Pin 1 is Open, no Resistor to +12V (PCB Default)\\
+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 ====
+Pin 1 is Connected to +12V via a Resistor\\
+Higher current results in lower distortion/higher noise\\
+lets look in the datasheet:\\
+{{:phatline:ssm2164-ab-a.png?600|}}\\
+Figures 11 and 12 show the THD and noise performance of the
+SSM2164 as the bias current is adjusted\\
+I_MODE = ( (V+)−0.6V )/ RB\\
+,52mA = (12V-0.6V) / 7,5K\\
+Leaving the MODE pin open sets the SSM2164 in Class AB with 30 μA in the Gain-Core\\

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