Click here for production status of specific part numbers. MAX20327 Evaluation Kit Evaluate: MAX20327 General Description Quick Start The MAX20327 evaluation kit (EV kit) is a fully assembled Required Equipment and tested circuit board that demonstrates the functionality MAX20327 EV kit of the MAX20327 double-pole, double-throw (DPDT) USB power supply or 1.6V to 5.5V power supply analog switches in a 9-bump wafer-level package (WLP). The EV kits features enable evaluation of the analog Audio source (e.g., MP3 player, computer, etc.) switches through audio jack inputs and outputs, as well External speakers or headphones with 3.5mm audio as SMA connectors for AC characteristic evaluation. Input jack power to the EV kits is provided by a Micro-USB, type-B connector or an external power supply. Procedure The EV kits are fully assembled and tested. Follow the Features steps below to verify board operation and begin evaluation: Proven PCB Layout 1) If using a USB power supply to power the board Decreased Evaluation Time through the Micro-USB connector (J1), verify that a Fully Assembled and Tested shunt is installed shorting pins 3-4 on jumper JU2. This powers the devices from the output of the on- SMA and 3.5mm Audio Jack Connectors board LDO. To adjust the LDO output voltage, connect Directly Evaluate AC Characteristics Through SMA a voltmeter at test point T3 and turn the screw on the Connectors potentiometer (R3) until reaching the desired value. To Quickly Evaluate Audio Performance with 3.5mm use the raw bus voltage as the power supply for the Audio Jack Connectors devices, place the shunt so that it is shorting pins 5-6 USB 5V Power with On-Board Adjustable LDO on JU2. 2) If an external power supply is used, apply the power at test point T2 and use the shunt to short pins 1-2 on JU2 to provide power to the parts from the external supply. Ordering Information appears at end of data sheet. 3) Verify that jumper JU1 has a shunt installed shorting pins 2-3 and that jumper JU4 has a shunt installed shorting pins 2-3. Installing the shunts in these locations provides power from the source to the V pin of the CC devices. 4) Verify that jumper JU3 has a shunt installed shorting pins 1-2. This shorts the control bit (CB) on the devices to GND, electrically connecting NC1 to COM1 and NC2 to COM2. 5) Connect an audio source to the normally closed audio jack (P2), using the male-to-male 3.5mm audio cable included with the EV kit. 319-100231 Rev 0 8/18MAX20327 Evaluation Kit Evaluate: MAX20327 6) Connect external speakers or headphones to the common Power Supply audio jack (P3). The EV kits are powered by a user-supplied 1.6V to 5.5V 7) When the audio source outputs the audio signal, and external DC power supply connected between V EXT and GND, the raw USB bus supplied at the micro-USB JU3 has a shunt shorting pins 1-2, the audio signal should be heard on the speakers or headphones connector (J1), or the regulated output of the LDO (U2) that is powered by the USB bus. connected at P3. 8) Move the shunt on JU3 from pins 1-2 to pins 2-3. The AC Evaluation audio signal should no longer be heard on the speakers The EV kits have a secondary IC configured for evaluation or headphones connected at P3. of the AC characteristics of devices. SMA connectors 9) If the audio source connection moves from the (J2J5) allow for direct connection to a network analyzer. normally closed audio jack (P2) to the normally open 50 termination resistors (R6, R7) provide termination to audio jack (P1) with a shunt in position 2-3 on JU3, the match the typical 50 source resistance of the network audio signal on the common audio jack (P3) is heard analyzer, allowing for easy evaluation of these parameters. on the speakers or headphones. If the shunt on J3 is The ability to connect external DC bias voltages at test in position 1-2, there is no audio signal heard on the points T7 and T8 further simplifies evaluation of AC speaker or headphones. characteristics while using a network analyzer that cannot provide DC offset voltages. Detailed Description of Hardware V Status LED BUS The MAX20327 EV kit is fully assembled and tested An indicator diode (D1) is included on the EV kits, circuit board that demonstrates the functionality of the indicating that a V voltage is present on the micro- MAX20327 DTDT analog switches in a 9-bump WLP. BUS USB connector (J3). If the LED glows green, power is The EV kit features enables evaluation of the analog present at J3 and the board can be powered by either switches through audio jack inputs and outputs, as well the LDO output or by the raw V supply (see Table 1 as SMA connectors for AC characteristic evaluation. Input BUS for jumper configurations). The status LED does not glow power to the EV kits is provided by a Micro-USB, type-B when a voltage is present on test point T2. connector or an external power supply. The EV kit PCBs are designed with 1oz copper. Maxim Integrated 2 www.maximintegrated.com