MAX40660EVKIT# Analog Devices

Click here for production status of specific part numbers. Evaluates: MAX40660 MAX40660 Evaluation Kit General Description Features The MAX40660 evaluation kit (EV kit) is a fully assembled Easy Electrical Evaluation of the MAX40660 electrical demonstration kit that provides a proven design EV Kit Designed for 50 Interfaces to evaluate the MAX40660 trans-impedance amplifiers. -40C to +125C Temperature Range Note that the MAX40660 EV kit provides an electrical Tested 10-TDFN-EP MAX40660ATB/VY+ device interface to the IC that is similar, but not the same as a Accommodates Easy-to-Use components photodiode. Proven PCB Layout The MAX40660 EV kit PCB comes with a MAX40660ATB/ Fully Assembled and Tested VY+ installed. Ordering Information appears at end of data sheet. MAX40660 EV Kit Photo 319-100402 Rev 0 5/19Evaluates: MAX40660 MAX40660 Evaluation Kit 7) Enable the power supply and signal generator Quick Start output. Observe for outputs from OUT+ and OUT- on Required Equipment the oscilloscope. +3.6V, 100mA DC Power Supply 8) The differential signal at the oscilloscope should be Signal Source Up to 1GHz approximately 62.5mV at 300MHz. P-P 500MHz to 2.5GHz Oscilloscope 9) Enable the power supply and signal generator output. Observe for outputs from OUT+ and OUT- on Procedure the oscilloscope. The MAX40660 EV kit is fully assembled and tested. 10) The differential signal at the oscilloscope should be Follow the below to verify board operation: approximately 125mV at 300MHz. P-P Caution: Do not turn on the power supply or the electronic load until all the connections are complete. Detailed Description of Hardware 1) Connect a +3.3V supply and ground to VIN SUPPLY The MAX40660 accepts AC and DC-coupled input connector and GND return pad of the EV kit, respectively. from a high-speed photodiode. The EV kit facilitates Disable the output of the power supply. evaluation of the MAX40660 TIA without a photodiode. The MAX40660 TIA is designed to be used with 2) Install a shunt on 2-3 of jumper J1 to enable the TIA. optical transceiver systems when the detectors (APD, (Installing a shunt on 1-2 of jumper J1 will force the PIN diodes) cathode connected to the IN input of the IC. TIA into low-power disable mode.) The device is to be used when AC input currents are flowing 3) Install a shunt on 2-3 of jumper J2 to selects the low out of the device at IN input of the IC. gain mode (25k transimpedance) (Installing a shunt When an APD with negative bias voltage is connected to on 1-2 of jumper J2) selects the high gain mode (50k the TIA input the signal current flows out of the amplifiers transimpedance)). summing node. The input current flows through an internal 4) Connect a signal source to IN AC (J4) edge-mount SMA load resistor to develop a voltage that is then applied to the input. Set the signal amplitude to 12.5mV (4.4mV P-P RMS input of the second stage. An internal clamp circuit protects or -34dBm), which corresponds to 5A . Set the P-P against input currents up to 100mA up to 100ns and up to frequency to 300MHz. Disable the signal generator 2A for 10ns pulses at low duty cycles. For more information output. about the device, please refer to the IC data sheet. 5) Connect OUT1+ (J7) and OUT- (J6) edge-mount Theory of Operation SMA outputs to the 50 inputs of a high-speed oscilloscope. The MAX40660 EV kit provides photodiode emulation using a simplified electrical photodiode model. The model 6) Verify all the shunts are in default positions, as shown provides a 50 electrical input termination, and resistors in Table 1. that convert the high-speed input voltage to high-speed current. A DC path is provided to model the average Table 1. Jumper Function photodiode current. JUMPER Test Interface POSITION FUNCTIONS LABEL The MAX40660 outputs are back terminated with 50. 2-3* Enables U1. Active Mode When terminating the outputs to 50 oscilloscope, the J1 ac-coupling capacitors C6 and C7 are present and Disables U1 or Low Power 1-2 resistor R0 is not installed. When interfacing with subsequent Disable Mode amplifiers or LVDS- capable devices, ac-coupling capacitors Low Gain Mode Selected (C6,C7) and 100 resistor (R0) are installed when the J2 2-3* (25k Transimpedance) subsequent device has internal bias. Replace C6 and C7 High Gain Mode Selected ac coupling capacitors with 0 resistors in case of DC 1-2 (50k Transimpedance) coupling into the device. *Default position Maxim Integrated 2 www.maximintegrated.com