�������������������������� ���� �������������������������������������������������������������� � � � � � � � � � � � � � � � INTRODUCTION TYPICAL COMPONENT FUNCTIONS Fast, easy breadboarding of circuits using the PA240CX are possible with the EK34 PC board. Mounting holes are provided and the provision for standard banana jacks simplifies connection and testing. The amplifier may be mounted horizontally or vertically. Components are labeled on both sides of the board for ease in probing. A multitude of circuit configurations are possible, so only several component locations have specific functions and will usually be necessary. This kit is not suitable for use with PA240CC. COMPONENT FUNCTION C1,7 Alone is a roll off, with R3, 13 is a current out stability network (ref. AN19) C2,6 With R6, 15 forms noise gain compensation network (ref. AN25) C3,4 Supply bypass, .22 to 1µF ceramic C5,8 With R9, 20 forms a Howland stability network, can jumper both to ground +IN Cc Sets compensation to match desired gain Cs Normally not used. D1-4 Flyback protection diodes R1,11 Inverting inputs, install to input line or to ground R2,12 Negative feedback, install to V for voltage out or to I for current output (ref. AN19) R3,13 With C1, 7 forms a stability network for current output (ref. AN19) R4,14 Current sense for current outputs (ref. AN13) R5,15 With C2, 6 forms noise gain compensation network (ref. AN25) R6,17 Input R for Howland current ����� ��� pump or differential, usually ��� shorted for non-inverting �� �� R7,19 Current sense for Howland ��� current pump. Could also be �� ��� used to isolate large Cloads (ref. AN25) ��� ��� R8,21 Positive feedback, install to H ���� for a Howland current pump, to D for a differential circuit R9,20 With C5, 8 forms a Howland stability net work, can jumper both to ground +IN R10 With an equal value R12 pro���������� ��� vides gain = -1 for a bridge slave (ref. AN3,20) R18,19 Can provide mid-supply reference for single supply bridge (ref. AN3, 20) Rc Normally shorted. ����� Rs Normally not used. PARTS LIST Part # Eval 34 Clamp04 MS11 TW14 HS29 Description Evaluation Board PA40/140CX Clamp for HS29 Pin Receptacle, 30 pin strip Thermal Washer TO220 10/Pack Heat Sink, 2.7 DEG/W EQUIVALENT SCHEMATIC � �� �� ���� �� � � ���� ��� ��� �� �� �� � �� �� �� � �������� � � Quantity 1 2 1 1 1 �� �� � � �� ��� �� ��� �� � ��� � �� �� �� �� �� ��� � ��� ��� ���� ��� �� �� � � ���� ��� ��� ��� ��� ��� � � �� � �������� � � ��� ���� ��� �� �� ��� ��� �� �� ��� � �� ��� ��� � ��� � ��� �� ��� APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected] 1 EVALUATION KIT FOR PA240CX PIN-OUT EK34 ���� ������� ���� FIGURE 1. ���� ���������������� ���� ��� ��� ��� ���� ���� ���� ����� ��� ��� ��� ��� �� �� ��� ��� �� ���� ��� �� �� �� ����� ��� ������ ��� � �������������� ���� �� �� �� �� �� �� � � �� �� �� ��� ��� � � �� �� �� �� � � ��� ��� �� �� �� �� �� � � EVAL34 TOP �� ��� �� �� ��� ��������������� �������� �� ��� �� �� �������� �� ��������������������������� ��� EVAL34 BOTTOM This data sheet has been carefullyCORPORATION checked and is believed to be NORTH reliable, however, no responsibility is assumed for possible inaccuracies omissions. All specifications HOTLINE: are subject to1change without notice. APEX MICROTECHNOLOGY • 5980 SHANNON ROAD • TUCSON, ARIZONA 85741 •orUSA • APPLICATIONS (800) 546-2739 2 EK34U REV E JUNE 2005 © 2005 Apex Microtechnology Corp.