MAX40662EVKIT# Analog Devices

Click here for production status of specific part numbers. Evaluates: MAX40662 MAX40662 Evaluation Kit General Description MAX40662 EV Kit Photo The MAX40662 evaluation kit (EV kit) is a fully assembled electrical demonstration kit that provides a proven design to evaluate the MAX40662 quad transimpedance ampli- fiers. Note that the MAX40662 EV kit provides an electrical interface to the IC that is similar, but not identical, to a photodiode. The MAX40662 EV kit printed circuit board (PCB) comes with a MAX40662ATE/VY+ installed. Features and Benefits Easy Electrical Evaluation of the MAX40662 EV Kit Designed for 50 Interfaces -40C to +125C Temperature Range Accommodates Easy-to-Use Components Proven PCB Layout Fully Assembled and Tested Ordering Information appears at end of data sheet. 319-100515 Rev 0 3/20Evaluates: MAX40662 MAX40662 Evaluation Kit Channel Selection Quick Start The MAX40662 EV kit uses jumpers J3 and J4 to select Required Equipment the input channel to pass to the outputs. Table 2 provides +3.6V, 100mA DC Power Supply the four combinations to select the desired channels. Signal Source Up to 1GHz 500MHz to 2.5GHz Oscilloscope Table 1. MAX40662 Jumper Descriptions Procedure SHUNT JUMPER DESCRIPTION The MAX40662 EV kit is fully assembled and tested. POSITION Follow the below to verify board operation: High Gain Mode Selected 1-2 Caution: Do not turn on the power supply or the electronic (50k Transimpedance) J1 load until all the connections are complete. Low Gain Mode Selected 2-3* 1) Connect a +3.3V supply and ground to VCC connec- (25k Transimpedance) tor and GND return pad of the EV kit, respectively. Disable Mode. Disables U1 or low 1-2 Disable the output of the power supply. power. J2 2) Verify all the shunts are in default positions, as 1-3 Connects to LP SMA. shown in Table 1. 1-4* Active Mode. Enables U1. 3) Connect a signal source to the IN1 edge-mount SMA Channel Selection Input SEL0. 1-2* input. Set the signal amplitude to 12.5mV P-P Connects to ground. (4.4mVrms or -34dBm), which corresponds to Channel Selection Input SEL0. 5A . Set the frequency to 100MHz. Disable the P-P J3 1-3 Connects to SEL0 SMA. signal generator output. Channel Selection Input SEL0. 4) Connect the OUTP and OUTN edge-mount SMA out- 1-4 Connects VCC. puts to the 50 inputs of a high-speed oscilloscope. Channel Selection Input SEL1. 5) Enable the power supply and signal generator out- 1-2* Connects to ground. put. Observe the outputs from OUTP and OUTN on the oscilloscope. Channel Selection Input SEL1. J4 1-3 Connects to SEL1 SMA. Detailed Description of Hardware Channel Selection Input SEL1. 1-4 The MAX40662 accepts AC- and DC-coupled input from Connects VCC. a high-speed photodiode. The EV kit facilitates evalu- *Default position. ation of the MAX40662 TIA without a photodiode. The MAX40662 TIA is designed to be used with optical trans- ceiver systems when the detectors (APD, PIN diodes) Table 2. Jumper Description for Channel cathode is connected to the IN pin of the IC. The device Selection is to be used when AC input currents are flowing out of the device at the IN pin of the IC. JUMPER J4 JUMPER J3 INPUT When an APD with negative bias voltage is connected to (SEL1) (SEL0) CHANNEL SHUNT POSITION SHUNT POSITION the TIA input, the signal current flows out of the amplifiers summing node. The input current flows through an inter- 1 1-2* 1-2* nal load resistor to develop a voltage that is then applied 2 1-2 1-4 to the input of the second stage. An internal clamp circuit 3 1-4 1-2 protects against input currents up to 100mA up to 100ns and up to 2A for 10ns pulses at low duty cycles. For more 4 1-4 1-4 information about the device, refer to the IC data sheet. Maxim Integrated 2 www.maximintegrated.com