Apex Digital EK57 Addendum

INTRODUCTION

This addendum describes how the evaluation kit for MP108 and MP111 amplifier devices (aka EK57) can
also be used to evaluate MP118. The bread boarding areas of EK57 are used for placement of additional com-
ponents to facilitate evaluation of MP118's extra features.

WHAT IS MP118?

MP118 is a derivative of MP108. Compared to MP108 it features the following extra functionality /
improvements:
• The typical quiescent current has been reduced to 26mA (MP108: 50mA)
• MP118 contains a temperature sensor that provides a voltage proportional to the case temperature at
the TEMP pin (7)
• MP118 contains a latching protection circuit that disables the amplifier if an over-temperature or over-
current is detected. This circuit can be reset through an extra RESET pin (10)
• MP118 has an extra SHUT-DOWN pin (9) to facilitate external disabling of the module
Overall dimensions and location / size of mounting holes as well as the location of connectors and pin-out
(except the 3 previously described pins TEMP, RESET, and SD) of MP118 are the same as those of MP108.

ASSEMBLY INSTRUCTIONS

The remainder of this Addendum builds on the assembly instructions in the datasheet of EK57.
• At the end of step 2 DO NOT REMOVE the carrier strips! Since the cage jacks for pins 7, 9, and 10 are
unsoldered, they would be pulled out of the PCB by removing the carrier strip. However, we need to con-
nect to these pins!
• Strip ~0.6"(15mm) of the insulation off of very thin wired-wrap, kynar, 30AWG works best) and carefully
wrap the stripped portion of the wire around a 1/16" (1.5mm) drill bit (if not available: use one of the
cage jacks cut from the original MS11 strips);
• Carefully remove the drill bit (or cage jack), place the wrapped wire around the cage jack for pin 7 and sol-
der it. Cut the wire to leave a length of ~5" (12.5cm). Repeat for pins 9 and 10.
• Now remove the unsoldered cage jacks with the carrier strip segments. Note that the cage jacks of pins 7,
9, and 10 remain in the PCB.
• Continue with assembly step 3 of EK57's datasheet and then perform the following (DO NOT EXECUTE
steps 4 to 17 of EK57's datasheet yet).
Figure 1: 1.5mm drill bit used as wrap tool
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EK57 - Addendum
Figure 2: Wires connecting to pins 7, 9, and 10
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EK57
after soldering
Jan 2016
EK57U-Addendum Rev B