Datasheet

Evaluates: MAX4990
MAX4990 Evaluation Kit
2 _______________________________________________________________________________________
Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
• MAX4990 EV kit
• A user-supplied electroluminescent (EL) lamp
• 5V DC power supply
• Oscilloscope to monitor VA and VB
Procedure
The MAX4990 EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
1) Verify that all jumpers (JU1–JU8) are in their default
positions, as shown in Table 1.
2) Connect the VA and VB alligator clip leads to the EL
lamp. Note: Under some conditions, the VA/VB
output may be as high as 250V
P-P
.
3) Connect the oscilloscope to VA and VB. With math
function, monitor VA-VB waveform.
4) Connect the 5V DC power supply between the VDD
and GND pins.
5) Switch on the 5V power supply. Verify that the EL
lamp illuminates.
Table 1. MAX4990 EV Kit Jumper Descriptions (JU1–JU8)
Component Suppliers
SUPPLIER PHONE WEBSITE
Central Semiconductor Corp. 631-435-1110 www.centralsemi.com
Murata Mfg. Co., Ltd. 770-436-1300 www.murata.com
TDK Corp. 847-803-6100 www.component.tdk.com
TOKO America, Inc. 847-297-0070 www.tokoam.com
Note: Indicate that you are using the MAX4990 when contacting these component suppliers.
JUMPER SIGNAL SHUNT POSITION FUNCTION
1-2* Set by R2
JU1 SLEW
2-3 Adjustable by VR1
1-2* EN = logic-high: normal operation
JU2 EN
Open EN = logic-low: shutdown
1-2 Adjustable by VR2
JU3 DIM
2-3* Set by R4
1-2 Adjustable by VR3
JU4 EL
Open* Set by C2
1-2 Adjustable by VC1
JU5 SW
Open* Set by C3
1-2*
Power supplied to U2 by VDD
Note: VDD must be ≤ 5V
JU6 VDD2
Open U1 must be powered independently
1-2*
Power supplied to U1 by VDD
Note: VDD must be ≤ 5V
JU7 VDD1
Open U2 must be powered independently
1-2*
VDD and VBATT connected together
Note: VBATT must be ≤ 5V
JU8 VBATT
Open VBATT supplies L1 independent of VDD
* Default position.