Evaluates: MAX3806 19-4980 Rev 0 9/09 MAX3806 Evaluation Kit General Description Features The MAX3806 evaluation kit (EV kit) is an assembled and S Powered by +5V Supply tested demonstration board that simplifies evaluation of S Input Configurable for Electrical and Optical the MAX3806 receiver for optical distance measurement. Evaluation The input can be configured to evaluate the receiver with S Selectable +5V or +12V Photodiode Reverse Bias and without a photodiode. The board is powered by a +5V supply and an optional +12V supply can be used S 2-Pin Jumpers Set Operational Modes for photodiode reverse bias. Simple 2-pin jumpers set S SMA Connectors for Input and Output the operational modes. SMA connectors at the input and output provide an easy interface to test equipment. Ordering Information PART TYPE MAX3806EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 1 x 3-pin headers (0.1in centers) 33F 10% tantalum capacitor JU4 1 Sullins PEC36SAAN C1 1 (C case) Nichicon F931C336MCC Inductor (1210) L1 1 Panasonic ELJ-PA470KF 0.1F 10% ceramic capacitors C2, C4, C5 3 (0603) Shielded power inductor L2 1 API Delevan, Inc. SDS680R-225M 0.01F 10% ceramic capacitors C3, C6 2 (0603) R1 1 49.9 1% resistor (0603) R2 1 24.9k 1% resistor (0603) 2pF 0.25pF ceramic capacitor C7 1 (0603) R3 1 499 1% resistor (0603) R4 1 2k 1% resistor (0603) 1F 10% ceramic capacitor C8 1 (0603) Test points TP1TP5 5 Keystone 5000 D1 0 Photodiode (not installed) Test points Receiver for optical distance J1, J2, J5 3 Keystone 5000 U1 1 measurement (12 TQFN-EP*) Maxim MAX3806GTC+ SMA connectors, edge-mount, J3, J4 2 round contact Shunts for JU1JU4 4 Johnson 142-0701-801 Sullins SSC02SYAN 1 PCB: MAX3806 EVKIT+ REV A 1 x 2-pin headers (0.1in centers) JU1, JU2, JU3 3 Sullins PEC36SAAN +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX3806 Evaluation Kit 10) Mount the EV kit in a fixture or place in a clamp and Quick Start align the laser source to the photodiode. Electrical Evaluation 11) Connect the receiver output (SMA J4) to a scope. 1) Remove bias inductor L2. This inductor is used only Verify the scope input is set to high impedance. The for optical evaluations. pulse should appear on the scope. The pulse shape 2) Reinstall C7 and R2, if removed previously for optical and amplitude depend on multiple factors including evaluation. distance and alignment to the laser source, photodi- ode reverse bias voltage, capacitance and respon- 3) Verify jumpers are installed on JU1 (DIS) and JU2 sivity of the photodiode, and scope bandwidth. (GAIN). This enables the receiver and sets the gain to 60kI. Detailed Description 4) Remove jumper from JU3 (ATT). This sets the internal The MAX3806 EV kit is a simple board for evaluating the attenuator to 0dB. functionality and performance of the MAX3806 receiver. 5) Connect a +5V supply to J1 (+5V VCC) and J2 The input is configured for electrical evaluation using a (GND). Set the supply current limit to 20mA. passive network that emulates the response of a photo- 6) Connect an electrical pulse generator to the receiver diode. A few components can be removed and a photo- input (SMA J3). Set the pulse amplitude = 258mV P diode installed for optical evaluation (see the Quick Start (this converts to 10A through on-board series P section and Figures 1 and 2). Photodiode reverse bias 25kI resistor), width = 60ns, and period = 8s. is selected using a 3-pin jumper to be +5V (main board supply) or +12V, which requires a second supply. Two- 7) Connect the receiver output (SMA J4) to a scope. pin jumpers set the operating modes for gain, attenua- Verify the scope input is set to high impedance. The tion, and output disable (see Table 1). Input and output output pulse amplitude should be approximately SMA connectors provide an easy interface to 50I test 600mV . P equipment such as a pulse generator, network analyzer, Optical Evaluation spectrum analyzer, and scope. 1) Remove C7 and R2. Photodiode Emulation 2) Reinstall bias inductor L2, if removed previously for The input is configured for electrical evaluation after electrical evaluation. removing bias inductor L2. The input has an on-board 3) Install photodiode D1 (not included with EV kit). 50 termination and is AC-coupled to the receiver. The board layout accommodates through-hole and There is a series resistor to transform voltage pulses to surface-mount photodiodes. current pulses and a shunt capacitor connected directly at the input pin to help emulate the photodiode junction 4) Verify jumpers are installed on JU1 (DIS) and JU2 capacitance. This network provides an electrical inter- (GAIN). This enables the receiver and sets the gain face to the IC that is similar, but not exactly the same, as to 60kI. a photodiode. 5) Remove jumper from JU3 (ATT). This sets the internal The input current is calculated as: attenuator to 0dB. I = V /R IN IN IN 6) Connect a +5V supply to J1 (+5V VCC) and J2 (GND). Set the supply current limit to 20mA. V = source voltage terminated into 50I IN 7) Move jumper to left side of JU4 (side labeled +12V). R = series resistor (R2) + MAX3806 input impedance IN 8) Connect a +12V supply to J5 (+12V PD BIAS). Set Note that the MAX3806 input impedance changes with the supply current limit to 5mA. the GAIN setting. See Table 2. 9) Set up an optical pulse generator with peak ampli- For example, with GAIN = 60kI and ATTENUATION = 0dB, tude = 10W, width = 60ns, and period = 8s. Use a 258mV input voltage generates a 10A input current. P P an optical-to-electrical (O/E) converter and scope The resulting MAX3806 output would be approximately to verify the transmitter pulse shape and amplitude. 600mV (10A x 60kI) when terminated into a high- P impedance (2kI or greater) load. 2 Evaluates: MAX3806