MAX13487E_08 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Evaluation Kit

19-3204; Rev 1; 11/08
MAX13487E Evaluation Kit
General Description
The MAX13487E evaluation kit (EV kit) is a fully assem-
bled and tested PCB that contains a half-duplex RS-
485/RS-422 AutoDirection-controlled transceiver with
ESD protection. The EV kit circuit features a differential
driver and receiver. The circuit’s receiver is a 1/4-unit
load for the RS-485 bus and can communicate up to
500kbps. The MAX13487E AutoDirection and reduced-
driver slew-rate features are demonstrated on the EV kit
circuit. The EV kit can also be used to evaluate the
MAX13488E IC, which can communicate up to 16Mbps.
Power for the transceiver circuit is provided by a MAX256
H-bridge DC/DC converter, which powers the isolated
section of the MAX13487E RS-485/RS-422 circuit. Input-
ripple current and radiated noise are minimized by using
an H-bridge design. The isolated H-bridge DC-DC con-
verter operates at 420kHz. Input power to the EV kit
circuit can be supplied by a +5V DC source.
The DC-DC converter circuit uses a surface-mount
transformer to provide galvanic isolation and a full-wave
rectifier, and provides a regulated +5V to the
MAX13487E. A MAX1659 linear low dropout (LDO) reg-
ulator provides the regulated output and up to 300mA
of current. The output current limit and thermal shut-
down provide for a robust isolated RS-485/RS-422
transceiver circuit and power supply. The transceiver
and power circuits and PCB are designed for
2500V_RMS isolation.
Features
o Demonstrates MAX13487E AutoDirection Feature
o Designed for 2500V_RMS Isolation
o 1/4 RS-485 Unit Loading
o 500kbps Half-Duplex RS-485/RS-422
Communication
o +5V DC Input Range
o Isolated +5V Output
o Center-Tapped Full-Wave Rectifier Output
o 420kHz Switching Frequency
o Output Current Limit and Thermal Shutdown
o Low-Cost Integrated-FET H-Bridge Design
o Also Evaluates MAX13488E (After IC
Replacement)
o Fully Assembled and Tested
Ordering Information
PART
MAX13487EEVKIT#
#Denotes RoHS compliant.
TYPE
EV Kit
Component List
DESIGNATION
C1
QTY
1
DESCRIPTION
10µF ±10%, 10V X7R ceramic
capacitor (1206)
Murata GRM31CR71A106K
0.47µF ±10%, 16V X7R ceramic
C2
1 capacitor (0805)
Murata GRM219R71C474K
0.1µF ±10%, 16V X7R ceramic
C3, C5, C6, C7 4 capacitors (0603)
Murata GRM188R71C104K
1µF ±10%, 16V X7R ceramic
C4
1 capacitor (0805)
Murata GRM21BR71C105K
D1, D2
2 ^{30V, 1A Schottky diodes (SOD123)}
Diodes Inc. B130LAW
15V, 350mW ±5% zener diode
D3
1 (SOT-23)
Central Semiconductor CMPZ5245B+
DESIGNATION
JU1, JU3, JU4,
JU5, JU6
JU2
R1
R2, R9
R4, R5
R6, R8
R7
T1
U1
QTY
5
1
1
2
2
2
1
1
1
DESCRIPTION
2-pin headers
3-pin header
39.2kΩ ±1% resistor (0603)
100kΩ ±5% resistors (0603)
270Ω ±5% resistors (0805)
220Ω ±5% resistors (0805)
120Ω ±5% resistor (0805)
500µH, 1.5W, 3:8-turn, 400kHz
transformer (6-pin Gull Wing)
HALO Electronics TGM-380NARL
Half-duplex, high-speed transceiver
(8 SO)
Maxim MAX13487EESA+
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.