MAX7058 Evaluation Kit
Evaluates: MAX7058
General Description
The MAX7058 evaluation kit (EV kit) provides a proven
design to evaluate the MAX7058 dual-frequency ASK
transmitter in a 24-pin TQFN package with an exposed
pad. The EV kit enables testing of the device’s RF perfor-
mance and requires no additional support circuitry. The
RF output uses a 50I matching network and an SMA
connector for convenient connection to test equipment.
The EV kit comes with a MAX7058ATG+ installed on the
EV board.
S
Proven PCB Layout
S
Proven Components List
S
Adjustable Programmable Frequency (315MHz
Features
and 390MHz)
S
Fully Assembled and Tested
Ordering Information
PART
MAX7058EVKIT+
TYPE
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
C1, C2, C3
QTY
3
DESCRIPTION
0.01FF
Q10%,
50V X7R ceramic
capacitors (0603)
Murata GRM188R71H103K
0.1FF
Q10%,
16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
680pF
Q5%,
50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H681J
220pF
Q10%,
50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H221K
100pF
Q5%,
50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H101J
8.2pF
Q0.25pF,
50V C0G ceram-
ic capacitor (0603)
Murata GRM1885C1H8R2C
10pF
Q5%,
50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H100J
Not installed, ceramic capacitors
(0603)
DESIGNATION
J1
JU1–JU12
L1
L2
R1
REFIN
RFOUT
TP1, TP3–TP12
TP2
U1
QTY
1
12
1
1
1
0
1
11
0
1
DESCRIPTION
5-pin header
3-pin headers
18nH
Q5%
inductor (0603)
Murata LQW18AN18NJ00
22nH
Q5%
inductor (0603)
Murata LQW18AN22NJ00
0W
Q5%
resistor
Not installed, SMA female verti-
cal mount
SMA female vertical mount
Black miniature test points
Not installed, miniature test point
315MHz/390MHz dual-frequency
ASK transmitter (24 TQFN-EP*)
Maxim MAX7058ATG+
15MHz crystal
Crystek 017480
Shunts
PCB: MAX7058 EVALUATION
KIT+
C4, C5
2
C6
1
C7, C8
2
C9, C10
2
C11
1
Y1
—
—
*EP
= Exposed pad.
1
12
1
C12, C13
2
C14, C15
0
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-4831; Rev 0; 10/09
MAX7058 Evaluation Kit
Evaluates: MAX7058
Component Suppliers
SUPPLIER
Crystek Corporation
Murata Electronics North America
PHONE
800-237-3061
770-436-1300
WEBSITE
www.crystek.com
www.murata-northamerica.com
Note:
Indicate that you are using the MAX7058 when contacting these component suppliers.
Quick Start
• MAX7058 EV kit
• Spectrum analyzer
• 2.7V, 25mA power supply
The MAX7058 EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
Required Equipment
7) To test at a carrier frequency of 390MHz, change the
shunt on jumper JU12 to the 2-3 position (FSEL = 0).
8) Set the spectrum analyzer to a center frequency of
390MHz and a span of 1MHz.
9) With the shunt on jumper JU2 in the 1-2 position, the
spectrum analyzer should display a peak of approxi-
mately +10dBm at 390MHz. Set DIN to 0 by moving
the shunt on JU2 to the 2-3 position. The spectrum
analyzer peak at 390MHz is gone and only the noise
floor displays. Set DIN to 1 by changing the shunt on
JU2 to the 1-2 position. The center frequency is again
at 390MHz.
Additional Evaluation
For efficiency measurements, apply power to the VDD
pad with an ammeter in series. Apply 2.7V to VDD.
Connect a power meter to RFOUT. Measure the output
power and supply current.
The efficiency is calculated by the following equation:
10
(P
OUT
/10)
Efficiency
=
Ix V
Procedure
1) Verify that all jumpers (JU1–JU12) are in their default
positions, as shown in Table 1.
2) Connect the positive terminal of the 2.7V power sup-
ply to the VDD pad and the GND terminal to the GND
pad.
Do not turn on the power supply.
3) By default, the MAX7058 is set to the carrier frequen-
cy of 315MHz (TOGGLE = 0, FSEL = 1).
4) Connect the RFOUT SMA connector to the spectrum
analyzer. Set the analyzer to a center frequency of
315MHz and a span of 1MHz.
5) Add a shunt on jumper JU2 to the 1-2 position. This
forces DIN to go high.
6) Turn on the power supply and observe the spectrum
analyzer. The spectrum analyzer should display a
peak of approximately +10dBm at 315MHz. Set DIN
to 0 by moving the shunt on jumper JU2 to the 2-3
position. The spectrum analyzer peak at 315MHz is
gone and only the noise floor displays. Set DIN to 1
by changing the shunt on JU2 to the 1-2 position. The
center frequency is again at 315MHz.
eq. 1
where I is in milliamps, V is in volts, and P
OUT
is in deci-
bels relative to 1mW.
For example, if P
OUT
is equal to +10dBm, supply cur-
rent is 10mA, supply voltage is 2.7V, and the efficiency
is approximately 37%.
2
Maxim Integrated
MAX7058 Evaluation Kit
Evaluates: MAX7058
Table 1. MAX7058 EV Kit Jumper Description (JU1–JU12)
JUMPER
JU1
SHUNT
POSITION
1-2*
2-3
1-2
JU2
2-3
Open*
JU3
1-2*
2-3
1-2
2-3*
JU5
JU6
JU7
JU8
JU9
JU10
JU11
JU12
*Default
position.
1-2*
2-3
1-2*
2-3
1-2*
2-3
1-2
2-3*
1-2*
2-3
1-2
2-3*
1-2
2-3*
1-2*
2-3
Connects DVDD to VDD.
Connects DVDD to TP1. Must apply an external voltage on TP1 to power DVDD.
Connects DIN to VDD.
Connects DIN to GND.
To apply external data to DIN, take the shunt off and apply a pattern on TP3. Data rate can be as
high as 100kbps NRZ.
Connects ENABLE to VDD (normal operation).
Connects ENABLE to GND (standby).
Connects TOGGLE to VDD (RF output data is toggled between the two carrier frequencies (see
Table 2).
Connects TOGGLE to GND (single-carrier frequency).
Connects AVDD to VDD.
Connects AVDD to TP6. Must apply an external voltage on TP6 to power AVDD.
Connects PAVDD to VDD.
Connects PAVDD to TP7. Must apply an external voltage on TP7 to power PAVDD.
Connects PAOUT to ROUT for ASK amplitude shaping in.
Connects PAOUT to PAVDD for ASK amplitude shaping out.
Connects CAP4 to VDD to add 4pF shunt capacitance to PAOUT only at 315MHz.
Connects CAP4 to GND.
Connects CAP3 to VDD to add 2pF shunt capacitance to PAOUT only at 315MHz.
Connects CAP3 to GND.
Connects CAP2 to VDD to add 1pF shunt capacitance to PAOUT only at 315MHz.
Connects CAP2 to GND.
Connects CAP1 to VDD to add 0.5pF shunt capacitance to PAOUT only at 315MHz.
Connects CAP1 to GND.
Connects FSEL to VDD (see Table 2).
Connects FSEL to GND (see Table 2).
DESCRIPTION
JU4
Table 2. Toggle Pin Operation
TOGGLE PIN
0
0
1
1
FSEL PIN
0
1
0
1
OPERATING STATE
Continuous fixed-frequency operation at 390MHz.
Continuous fixed-frequency operation at 315MHz.
Five packets toggle operation between 315MHz and 390MHz.
100 packets toggle operation between 315MHz and 390MHz.
Maxim Integrated
3
MAX7058 Evaluation Kit
Evaluates: MAX7058
Layout Issues
A properly designed PCB is essential for any RF/micro-
wave circuit. Keep high-frequency input and output lines
as short as possible to minimize losses and radiation. At
high frequencies, trace lengths that are on the order of
λ/10
or longer can act as antennas.
Both parasitic inductance and capacitance are influ-
ential on circuit layouts and are best avoided by using
short trace lengths. Generally, a 10-mil wide PCB trace,
0.0625in above a ground plane, with FR4 dielectric has
about 19nH/in of inductance and about 1pF/in of capaci-
tance. In the matching network, where the inductor is
on the order of 22nH and a capacitor is on the order of
10pF, the proximity of the circuit to the MAX7058 has a
strong influence on the effective component values.
To reduce the parasitic inductance, use a solid ground
or power plane below the signal traces. Also, use low-
inductance connections to ground on all GND pins,
and place decoupling capacitors close to all VDD
connections.
The MAX7058 operates from a 2.1V to 3.6V supply.
Apply an external voltage up to 3.6V between the VDD
and GND pads. VDD by default powers DVDD, AVDD,
and PAVDD.
DVDD, AVDD, and PAVDD
DVDD, AVDD, and PAVDD are powered by VDD by
default. To apply an external voltage to DVDD, change
the shunt on jumper JU1 to the 2-3 position and apply
an external voltage on TP1. To apply an external volt-
age to AVDD, change the shunt on jumper JU5 to the
2-3 position and apply an external voltage on TP6. To
apply an external voltage to PAVDD, change the shunt
on jumper JU6 to the 2-3 position and apply an external
voltage on TP7.
For applications where an external frequency is desired
over the crystal frequency, it is possible to apply an
external frequency through REFIN. Capacitors C14 and
C15 are necessary (use a 100pF capacitor and remove
the Y1 crystal). The MAX7058 operates by multiply-
ing the crystal frequency to the necessary RF carrier
frequency. When FSEL is low, the crystal frequency is
multiplied by 26 (390MHz) and when FSEL is high, the
multiplication is 21 (315MHz). Changing the frequency to
a different value would result in different carrier frequen-
cies and components not matching the required imped-
ance characteristics.
Power Supply
External Frequency Input
Detailed Description of Hardware
The MAX7058 EV kit provides a proven layout for the
MAX7058. On-board test points are included to monitor
various signals and to provide power (Table 3).
Table 3. Test Points
TP
1
2
3
4
5
6
7
8
9
10
11
12
DESCRIPTION
External DVDD supply
No connection (not populated)
DIN input
ENABLE input
TOGGLE input
External AVDD supply
External PAVDD supply
CAP4 input
CAP3 input
CAP2 input
CAP1 input
FSEL input
4
Maxim Integrated
MAX7058 Evaluation Kit
Evaluates: MAX7058
Figure 1. MAX7058 EV Kit Schematic
Maxim Integrated
5
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