Click here for production status of specific part numbers. Evaluates: MAX40658/MAX40569 MAX40658 Evaluation Kit General Description Quick Start The MAX40658 evaluation kit (EV kit) is a fully assembled Required Equipment electrical demonstration kit that provides a proven design MAX40658 EV kit to evaluate the MAX40658 and MAX40659 transimpedance +3.6V, 100mA DC power supply amplifier. Signal source up to 1GHz Note that the MAX40658 EV kit provides an electrical interface to the IC that is similar, but not identical to, a A minimum 500MHz to 2.5GHz oscilloscope photodiode. Procedure The MAX40658 EV kit PCB comes with a MAX40658AETA+ The MAX40658 EV kit is fully assembled and tested. 18.3k transimpedance device installed. To evaluate the Follow the below to verify board operation: MAX40659AETA+ (36.6k transimpedance), contact the Caution: Do not turn on the power supply or the electronic factory for free samples of the pin-compatible device. load until all the connections are complete. Features 1) Connect a +3.3V supply and ground to V1 Supply Easy +3.3V Electrical Evaluation of MAX40658 connector. 2) Connect a signal source to J2. Set the signal amplitude EV Kit Designed for 50 Interfaces to 20mV (7.07mV or -30dBm). (Corresponding P-P RMS -40C to +85C Temperature Range to 3.6A ). Set the frequency to 100MHz. P-P Evaluated 8-TDFN-EP MAX40658AETA+ Device 3) Apply 1A to the J11 DC input using a DC current source to emulate the DC component of the input Accommodates Easy-to-Use Components signal. A voltage source connected from J11 to GND Proven PCB Layout may be used if a DC current source is not available. Fully Assembled and Tested 4) Connect OUT1+ (J10) and OUT- (J7) to the 50 inputs of a high-speed oscilloscope. 5) Verify all the shunts are in default positions as shown in Table 1. 6) The differential signal at the oscilloscope should be Ordering Information appears at end of data sheet. approximately 43mV at 100MHz. P-P 319-100045 Rev 1 10/18Evaluates: MAX40658/MAX40659 MAX40658 Evaluation Kit For best performance, when providing the input voltage Detailed Description of Hardware pulse at J1, remove the DC blocking capacitors C1 and The MAX40658 accepts a DC-coupled input from a high- C2 and replace them with a 0 short to DC couple the speed photodiode. The MAX40658 evaluation board input to the MAX40658. Remove R3. facilitates evaluation of MAX40658 TIA without a photodiode. Use the following resistor combinations as shown in Table 1 The MAX40658 EV kit comes from the factory with a low input current and a high input current setup. to create the respective current amplitude pulses. Current Pulse Measurements Theory of Operation To perform pulse measurements, the current pulses are The MAX40658 EV kit comes with an 8-TDFN EP with created by providing a voltage pulse at J1 or J2 input. The circuit providing photodiode emulation using a simplified input series resistance combination (R5+R7) or (R6+R8) electrical photodiode model. The model provides a 50 respectively determines the amplitude of the current electrical input termination, resistors that convert the high- pulse. speed input voltage to high-speed current. A DC path is provided to model the average photodiode current. For best performance, when providing the input voltage pulse at J1, remove the DC blocking capacitors C1 and Test Interface C2 and replace them with a 0 short to DC couple the The MAX40658 outputs are back-terminated with 75. To input to the MAX40658. Remove R3. facilitate interface with 50 equipment, the MAX40658 EV Use the following resistor combinations as shown in the kit places external 150 termination resistors in parallel with table below to create the respective current amplitude each output so that the EV kit will match a 50 environment. pulses. Note that the output load has a direct effect on the overall gain and output signal swing. Because of the external Noise measurements 150 resistors and the 50 environments, the overall Remove the input resistors and shunt capacitor before gain is reduced by 33%. If matching a 50 environment attempting noise measurement. With the input resistors is not critical, higher gain can be achieved by increasing and shunt capacitor removed, the total capacitance at the the load resistance. IN-input 0.5pF. Current Pulse Measurements Evaluation of the MAX40659 To perform pulse measurements, the current pulses are This EV kit ships with the MAX40658ETA+ included. created by providing a voltage pulse at J1 or J2 input. To evaluate the MAX40659ETA+, contact the factory to The input series resistance combination (R5 + R7) or obtain a MAX40659ETA+ to evaluate with this EV kit. (R6 + R8), respectively, determines the amplitude of the current pulse. Table 1. Different Values of Rs (R5+R7) for Different Input Current Pulse Amplitudes. INPUT SERIES RESISTANCE R () GENERATOR INPUT AMPLITUDE STEP (V) GENERATED INPUT CURRENT STEP (MA) S 2200 0.55 0.1 100 0.35 1 9.4 4.6 92 Ordering Information PART TYPE MAX40658EVKIT EV Kit Denotes RoHS compliant. Maxim Integrated 2 www.maximintegrated.com