19-5114; Rev 0; 1/10
MAX9947 Evaluation Kit
General Description
The MAX9947 evaluation kit (EV kit) provides a proven
design to evaluate the MAX9947 AISG-compliant inte-
grated transceiver. The EV kit has two MAX9947 devices
installed on the board. When one MAX9947 works as a
transmitter, the other works as a receiver.
S
Proven PCB Layout
S
Fully Assembled and Tested
Features
S
Two MAX9947 Devices (One Works as a
Evaluates: MAX9947
Transmitter and the Other as a Receiver)
System Diagram
DIRMD1
TXIN
DIRMD2
TXOUT
RF FILTER
RXOUT
MAX9947
Ordering Information
PART
MAX9947EVKIT+
TYPE
EV Kit
RXIN
DIR
COAX
CABLE
+Denotes
lead(Pb)-free and RoHS compliant.
DIRMD1
TXIN
DIRMD2
TXOUT
RF FILTER
RXOUT
MAX9947
RXIN
DIR
Component List
DESIGNATION
C1, C2, C10,
C11
C3, C4, C12,
C13
QTY
4
DESCRIPTION
10FF
Q10%,
10V X5R ceramic
capacitors (0805)
Murata GRM21BR61A106K
0.1FF
Q10%,
16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
1FF
Q10%,
16V X7R ceramic
capacitors (0603)
Murata GRM188R71C105K
Not installed, ceramic capacitors
(0603)
39pF
Q5%,
50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H390J
DESIGNATION
J1, J3
J2, J4
JU1, JU6, JU7,
JU12–JU16
JU2–JU5,
JU8–JU11
L1, L2
R1, R7
R2, R8
R3, R9
R4, R10
R5, R11
R6, R12
TP1, TP9
QTY
2
2
8
8
2
2
2
2
2
0
2
2
DESCRIPTION
SMA connectors, edge mount
SMA connectors, vertical mount
2-pin headers
3-pin headers
0I
Q5%
resistors (0805)
1kI
Q5%
resistors (0603)
4.12kI
Q1%
resistors (0603)
10kI
Q1%
resistors (0603)
49.9I
Q1%
resistors (0603)
Not installed, resistors (0603)
10kI
Q5%
resistors (0603)
Red multipurpose test points
4
C5, C14
C6, C7, C15,
C16
C8, C9, C17,
C18
2
0
4
_______________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX9947 Evaluation Kit
Evaluates: MAX9947
Component List (continued)
DESIGNATION
TP2, TP4,
TP10, TP12
TP3, TP11
TP5–TP8,
TP13–TP18
U1, U2
QTY
4
2
10
DESCRIPTION
Black multipurpose test points
Yellow multipurpose test points
Red miniature test points
AISG integrated transceivers
(16 TQFN-EP*)
Maxim MAX9947ETE+
Y1, Y2
—
—
*EP
= Exposed pad.
2
16
1
DESIGNATION
VR1, VR2
QTY
2
DESCRIPTION
50kI top-adjust 12-turn trimmers
(2mm)
8.704MHz crystals
Hong Kong X’tals
SSL87040N1HS188F0-0
Shunts
PCB: MAX9947 EVALUATION
KIT+
2
Component Suppliers
SUPPLIER
Hong Kong X’tals Ltd.
Murata Electronics North America, Inc.
PHONE
852-35112388
770-436-1300
WEBSITE
www.hongkongcrystal.com
www.murata-northamerica.com
Note:
Indicate that you are using the MAX9947 when contacting these component suppliers.
Quick Start
•
•
•
•
MAX9947 EV kit
Waveform generator
2-channel oscilloscope
Required Equipment
3) Connect the 3.3V DC power supply between TP9
(U2_VCC) and TP10 (GND).
4) Set the waveform generator to output a square
wave. Set the amplitude to 3.3V, frequency to
38.4kHz, duty cycle to 50%, and offset to 1.65V.
5) Connect the waveform-generator output between
TP6 (TXIN) and TP2 (GND).
3.3V 100mA DC power supply
The following procedure demonstrates one MAX9947
(as a transmitter) modulating a 38.4kbps OOK signal
and transmitting the modulated signal to the second
MAX9947 (as a receiver). The receiver demodulates the
modulated signal and reconstructs the digital signal.
1) Verify that all jumpers (JU1–JU16) are in their
default positions, as shown in Table 1.
2) Connect the 3.3V DC power supply between TP1
(U1_VCC) and TP2 (GND).
Procedure
6)
Unused TXIN pin must be tied to VL to avoid data
collision. Tie TP14 to VL when using U2 as a
receiver.
Connect the oscilloscope channel 1 to TP6 (TXIN).
Connect the oscilloscope channel 2 to TP15
(RXOUT).
7)
8)
9) Verify that the waveforms of channels 1 and 2 are
similar.
10) Verify that TP16 (DIR) is asserted high, indicating
data is flowing from U1 to U2.
2
______________________________________________________________________________________
MAX9947 Evaluation Kit
Evaluates: MAX9947
Table 1. Jumper Descriptions (JU1–JU16)
JUMPER
JU1
JU2
JU3
JU4
JU5
JU6
JU7
JU8
JU9
JU10
JU11
JU12
JU13
JU14
JU15
JU16
*Default
position.
SHUNT POSITION
1-2*
Open
—
—
1-2*
2-3
1-2*
2-3
Open*
1-2
1-2*
Open
—
—
1-2*
2-3
1-2*
2-3
Open*
1-2
1-2*
Open
1-2*
Open
1-2*
Open
1-2*
Open
DESCRIPTION
U1 VL pin connected to U1 VCC pin
U1 VL pin disconnected from U1 VCC pin
See Table 2
See Table 2
U1 output level at TXOUT is set at +3dBm
U1 output level at TXOUT is adjustable by VR1
U1 uses on-board crystal
U1 uses external clock applied on SMA J2
U1 uses on-board crystal
U1 uses external clock applied on SMA J2
U2 VL pin connected to U2 VCC pin
U2 VL pin disconnected from U2 VCC pin
See Table 2
See Table 2
U2 output level at TXOUT is set at +3dBm
U2 output level at TXOUT is adjustable by VR2
U2 uses on-board crystal
U2 uses external clock applied on SMA J4
U2 uses on-board crystal
U2 uses external clock applied on SMA J4
SMA J1 and J3 signals connected by a PCB trace
SMA J1 and J3 signals not connected
U1 and U2 grounds connected
U1 and U2 grounds disconnected
U1 SYNCOUT pulled up to VCC through a 1kI resistor
U1 SYNCOUT not pulled up to VCC
U2 SYNCOUT pulled up to VCC through a 1kI resistor
U2 SYNCOUT not pulled up to VCC
_______________________________________________________________________________________
3
MAX9947 Evaluation Kit
Evaluates: MAX9947
Detailed Description of Hardware
The MAX9947 IC is an AISG-compliant, fully integrated
transceiver.
The EV kit has two MAX9947 devices on the board.
When one MAX9947 is configured as a transmitter,
the other can be configured as a receiver. A user can
connect the transmitter and the receiver though a user-
supplied coaxial cable, or by simply shorting a jumper
on the board for quick testing.
The IC output level at TXOUT can be set by using two
external resistors that connect at the RES and BIAS pins.
The EV kit defaults to the nominal power level of +3dBm
at the feeder cable as the AISG standard requires. Using
the U1 transceiver as an example, with R2 = 4.12kI and
R3 = 10kI, provides 1.78V
P-P
at TXOUT.
By placing a shunt on jumper JU4 (JU10 in the case of
U2 transceiver) across pins 2-3, the TXOUT voltage level
can be varied by using the on-board variable resistor
VR1 (VR2 in the case of U2). TXOUT is varied according
to the following equations:
For U1: V
TXOUT
(V
P-P
) = 2.52V
P-P
x R3/(R3 + VR1)
For U2: V
TXOUT
(V
P-P
) = 2.52V
P-P
x R9/(R9 + VR2)
By default, nominal 8.704MHz crystals are connected to
each MAX9947 AISG transceiver. Alternatively, a user
can apply an external clock on SMA connector J2 (J4
in the case of U2) and place shunts across pins 2-3 of
jumper JU5 and pins 1-2 of jumper JU6 (JU11 and JU12
in the case of U2) to disable the on-board crystals.
Jumpers JU2 and JU3 (JU8 and JU9 in the case of U2)
define the duration of the bit time, as shown in Table 2.
External Clock for AISG Transceiver
Transmission Output Power
Bit-Time Duration Selector
Table 2. Bit-Time Duration Selector (JU2, JU3, JU8, JU9)
DIRMD2
(JU2, JU8 SHUNT POSITION)
0 (2-3)
0 (2-3*)
1 (1-2)
1 (1-2)
*Default
position.
DIRMD1
(JU3, JU9 SHUNT POSITION)
0 (2-3)
1 (1-2*)
0 (2-3)
1 (1-2)
AISG DATA RATE
(kbps)
9.6
38.4
115.2
—
UNITY BIT TIME
(µs)
104.16
26.04
8.68
—
4
______________________________________________________________________________________
MAX9947 Evaluation Kit
Evaluates: MAX9947
Figure 1. MAX9947 EV Kit Schematic
_______________________________________________________________________________________
5
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