MAXIM MAX2016EVKIT

19-3453; Rev 1; 12/06
MAX2016 Evaluation Kit
The MAX2016 evaluation kit (EV kit) is a fully assembled
and tested surface-mount PCB that allows for easy
evaluation of the MAX2016 dual logarithmic
detector/controller. The MAX2016 EV kit includes connections to operate the device as a detector or as a
controller. The RF inputs utilize 50Ω SMA connectors
for convenient connections to test equipment.
Features
♦ Complete Gain and VSWR Detector/Controller
♦ Dual-Channel RF Power Detector/Controller
♦ Low Frequency to 2.5GHz Frequency Range
♦ Exceptional Accuracy Over Temperature
♦ High 80dB Dynamic Range
♦ 2.7V to 5.25V* Supply Voltage Range
♦ Internal 2V Reference
♦ Scaling Stable Over Supply and Temperature
Variations
♦ Controller Mode with Error Output
♦ Available in 5mm x 5mm, 28-Pin Thin QFN
Package
*See the Power-Supply Connection section.
Ordering Information
Component Suppliers
SUPPLIER
PHONE
WEBSITE
PART
TEMP RANGE
PIN-PACKAGE
-40°C to +85°C
28 Thin QFN-EP**
AVX Corp.
803-946-0690
www.avx.com
MAX2016EVKIT
Murata Mfg. Co., Ltd.
770-436-1300
www.murata.com
**EP = Exposed paddle.
Note: Indicate that you are using the MAX2016 when contacting these component suppliers.
Component List
DESIGNATION
QTY
DESCRIPTION
C3, C6, C10,
C13
4
C4, C7, C11,
C14
4
C5, C12, C15
0
680pF ±5%, 50V C0G ceramic
capacitors (0402)
Murata GRP1555C1H681J
33pF ±5%, 50V C0G ceramic
capacitors (0402)
Murata GRP1555C1H330J
0.1µF ±10%, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
Not installed, capacitors (0603)
C16, C17
0
Not installed, capacitors (0402)
C18
1
J1, J2
2
C1, C2, C8, C9
†The
4
10µF ±10%, 16V tantalum capacitor
(C case)
AVX TAJC106K016R
PCB edge-mount SMA RF
connectors (flat-tab launch)
Johnson 142-0741-856
exposed paddle conductor on U1 must be solder-attached
to a grounded pad on the PCB to ensure a proper electrical/thermal design.
DESIGNATION
QTY
DESCRIPTION
R1–R5
5
0Ω resistors (0402)
Any
R6
1
0Ω resistor (1206)
Any
R7–R10
0
TP1
1
TP2, TP4, TP9
3
TP3, TP5–TP8,
TP10
6
TP11, TP12,
TP13
0
Not installed, test points
U1
1
MAX2016ETI†
—
1
PCB: MAX2016EVKIT
Not installed, resistors
Large test point for 0.062in PCB
(red)
Mouser 151-107 or equivalent
Large test points for 0.062in PC
board (black)
Mouser 151-103 or equivalent
Large test points for 0.062in PC
board (white)
Mouser 151-101 or equivalent
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
Evaluates: MAX2016
General Description
Evaluates: MAX2016
MAX2016 Evaluation Kit
Quick Start
on the DC power or the RF signal generator until all
connections are made:
1) With the DC power supply disabled, set it to +3.3V
(through a low internal-resistance ammeter, if
desired) and connect to the V S (TP1) terminal.
Connect the power-supply ground to the GND
(TP2) terminal on the EV kit. If available, set the current limit to 100mA.
The MAX2016 EV kit is fully assembled and factory tested. See the Connections and Setup section for proper
device evaluation.
Recommended Equipment
• One DC power supply capable of delivering between
2.7V and 5.25V at 100mA (see the Power-Supply
Connection section for supply voltages > 3.6V).
2) Calibrate the power meter at 100MHz.
• Two signal generators capable of delivering -65dBm
to +5dBm at frequencies between 100MHz and
2.5GHz.
3) Connect the RF signal generators to the power
meter through a 6dB attenuator pad.
4) Calibrate the signal generator’s output (frequency
= 100MHz) over the desired power range.
Note: Some power meters may be limited in terms
of their dynamic range.
• One high-dynamic-range RF power meter for calibrating the signal generator.
• Five digital multimeters (DMMs) to monitor supply
voltage, supply current, and output voltages.
5) Disable the RF signal generator output powers.
Disconnect the power meter from the attenuator
pad and connect these pad outputs to the RFINA
and RFINB SMAs on the EV kit.
• Two 6dB attenuator pads.
Connection and Setup
This section provides a step-by-step guide to testing
the basic functionality of the EV kit. As a general precaution to prevent damaging the device, do not turn
6) Connect the VOUTA, VOUTB, and VOUTD wires to
three voltmeters. Enable the DC power supply. The
DC current of the EV kit should be approximately
43mA.
1.3VDC
1.3VDC
(VOLTMETER)
(VOLTMETER)
TP3
VOUTA
100MHz -24dBm
TP5
VOUTB
TP4
GND
100MHz -24dBm
MAX2016 EV KIT
6dB
J1
SMA
RFINA
TP6
A
TP11
CSETH
TP7
A+B
TP8
B
TP12
CSETL
VOUTD
TP10
J2
SMA
RFINB
TP1
VS
TP2
GND
6dB
3.30VDC
1VDC
3.30VDC
(VOLTMETER)
(VOLTMETER)
43.0mA
(AMMETER)
Figure 1. MAX2016 EV Kit Test Setup Diagram
2
_______________________________________________________________________________________
MAX2016 Evaluation Kit
8) Using the calibration results from step 4, set the
generator outputs to produce -30dBm into RFINA
and RFINB.
POWER
AMPLIFIER
TRANSMITTER
COUPLER
9) Verify that an output voltage at VOUTA and VOUTB
of approximately 1.3V is measured on the voltmeters.
GAIN-CONTROL
INPUT
10) Verify that an output voltage at VOUTD of approximately 1V is measured on the voltmeter.
11) Adjust the signal-generator power levels up and
down to see a corresponding change in VOUTA,
VOUTB, and VOUTD.
Evaluates: MAX2016
7) Enable the output powers of the RF signal generators.
LOGARITHMIC
DETECTOR
OUTA/
OUTB
SET-POINT
DAC
SETA/
SETB
RFINA/
RFINB
20kΩ
Detailed Description
The MAX2016 EV kit is a fully assembled and tested
surface-mount PCB that evaluates the MAX2016 dual
logarithmic detector/controller. The RF inputs utilize
50Ω SMA connectors for convenient connections to test
equipment.
Individual Log Amps (VOUTA and VOUTB)
20kΩ
MAX2016
Figure 2. Power-Controller Mode
The MAX2016 uses two individual log amps to measure
the input power applied to RFINA and RFINB. These
amplifiers are normally configured in detector mode to
provide an output signal proportional to the applied
input power level. The individual log amp output can
also be operated in a controller mode, if desired, to
control an external device using the input power as the
control parameter.
In the power-controller mode (Figure 2), the DC voltage
at OUTA or OUTB controls the gain of the PA leading to
a constant output power level. (Note: Only one controller channel is shown within the figure. Since the
MAX2016 is a dual controller/detector, the second
channel can be easily implemented by using the adjacent set of input and output connections).
Detector Mode
The MAX2016 EV kit is assembled with a 0Ω resistor for
R1 and R2. This sets the slope of the individual log amp
output signal to approximately 18mV/dB (RF =
100MHz). To increase the slope of either individual output signals, VOUTA or VOUTB, increase the value of R1
or R2, respectively. For example, if a 40kΩ resistor is
used for R1, the slope for the VOUTA signal increases
to 36mV/dB.
Comparator
The MAX2016 integrates two comparators to monitor
the difference in power levels (gain) of the RFINA and
RFINB. By default, R4 and R5 are set to be 0Ω.
Therefore, CSETL and CSETH are connected to VCC,
thus disabling the comparator operations. To enable
the comparator operations, R4 and R5 must be
removed. Load C16 and C17 with 0.1µF capacitors.
Use the reference voltage from the MAX2016 to generate two voltages through a resistor-divider network
(R7/R8 and R9/R10) to set the CSETH and CSETL trip
points. Alternately, R4, R5, and R7–R10 can be
removed and external voltages applied at CSETH and
CSETL to set the comparator trip points. Be sure to
observe the voltage limits specified in the MAX2016
data sheet.
The logic outputs at each comparator monitor the gain
independently. The COR output, (A + B), ORs the outputs of both comparators to tell whether the gain of the
amplifier falls in the range. For more information, refer to
the Applications Information section in the MAX2016
data sheet.
Power-Controller Mode
For operation of either VOUTA or VOUTB in controller
mode, remove R1 or R2. A set-point voltage must then
be applied to the SETA or SETB inputs. Use a DAC, an
external precision voltage supply, or the internal reference output and resistor-divider string to apply the setpoint voltage to SETA or SETB. Operate SETA or SETB
at voltages between 0.6V and 1.6V. RFINA or RFINB
are connected to the RF source and the VOUTA or
VOUTB is connected to the gain-control pin of the system under control.
Difference Amplifier (VOUTD)
_______________________________________________________________________________________
3
Evaluates: MAX2016
MAX2016 Evaluation Kit
Detector Mode
The MAX2016 EV kit is assembled with a 0Ω resistor for
R3. This sets the slope of the difference output signal,
VOUTD, to approximately -25mV/dB (RF = 100MHz). To
increase the slope of the difference output signal,
increase the value of R3. For example, if a 20kΩ resistor is used for R3, the slope for the difference signal
increases to -50mV/dB.
The bandwidth and response time of the difference output amplifier can be controlled with an external capacitor, C15. With no external capacitor, the bandwidth is
greater than 20MHz. Refer to the Applications
Information section in the MAX2016 data sheet for the
equation to calculate the required capacitance.
Gain-Controller Mode
The MAX2016 can be used as a gain controller within
an automatic gain-control (AGC) loop. In the gain-controller mode, remove R3. As shown in Figure 3, RFINA
and RFINB monitor the VGA’s input and output power
levels, respectively. The MAX2016 produces a DC voltage at VOUTD that is proportional to the difference in
these two RF input power levels. An internal op amp
compares the DC voltage with a reference voltage at
SETD. The op amp increases or decreases the voltage
at VOUTD until VOUTD equals to SETD. Thus, the
MAX2016 adjusts the gain of the VGA to a level determined by the voltage applied to SETD. Operate SETD
between 0.5V and 1.5V for the best dynamic range.
Frequency-Response Modifications
The MAX2016 EV kit has been optimized to support a
minimum operating frequency of 100MHz. However, if
desired, the kit can be modified to operate at a lower
frequency. The EV kit design includes external capacitors (C5 and C12) to lower the frequency operation
below 100MHz. These capacitors should be loaded in
conjunction with changes in the values of C1, C2, C8,
and C9 to lower the input frequency range below
100MHz. Refer to the Applications Information section
in the MAX2016 data sheet for the equation to calculate
the required capacitance.
Power-Supply Connection
The MAX2016 is designed to operate from a single
+2.7V to +3.6V supply. To operate under a higher supply voltage range, a resistor must be connected in
series with the power supply and VCC to reduce the
voltage delivered to the chip. For a +4.75V to +5.25V
supply, change R6 to a 37.4Ω (±1%) resistor.
VGA
VGA OUTPUT
VGA INPUT
COUPLER
COUPLER
GAIN-CONTROL INPUT
SET-POINT
DAC
SETD
OUTD
MAX2016
20kΩ
RFINA
LOGARITHMIC
DETECTOR
LOGARITHMIC
DETECTOR
Figure 3. In the Gain-Controller Mode, the VOUTD Maintains
the Gain of the VGA
and close placement of the parts to the IC. The
MAX2016 package exposed paddle (EP) conducts heat
from the part and provides a low-impedance electrical
connection. The EP must be attached to the PCB
ground plane with a low thermal and electrical contact.
Ideally, this can be achieved by soldering the backside
package contact directly to a top metal ground plane on
the PCB. Alternatively, the EP can be connected to a
ground plane using an array of plated vias directly
below the EP. The MAX2016 EV kit uses nine equally
spaced, 0.012in-diameter, plated through holes to connect the EP to the lower ground planes.
Keep the input traces carrying RF signals as short as
possible to minimize radiation and insertion loss due to
the PCB. The isolation of the RF inputs is dependent
upon the layout of these traces, which must be physically isolated from one another for optimum performance.
Each power-supply node on the PCB should have its
own decoupling capacitor. This minimizes supply coupling from one section of the PCB to another. Using a
star topology for the supply layout, in which each powersupply node in the circuit has a separate connection to
the central node, can further minimize coupling between
sections of the PCB.
Layout Considerations
The MAX2016 evaluation board can be a guide for
board layout. Pay close attention to the thermal design
4
RFINB
_______________________________________________________________________________________
MAX2016 Evaluation Kit
Evaluates: MAX2016
VREF
TP3
VOUTB
VOUTA
GND
TP4
R1
2
3
4
C18
RFINB-
5 GND
MAX2016
6
EXPOSED
PADDLE
COUTH
COUTL
10
11
FV2
9
12
13
FV1
CSETL
8
C16
GND
TP9
20
C8
19
J2
SMA
RFINB
C9
18
TP8
16
B
VREF VCC
15
R9
R5
CSETL
TP12
C15
TP7
VCC
C7
C11
C10
14
A+B
R8
21
GND 17
CSETH
R7
R10
VCC
C6
GND
TP2
FB2
OUTB
SETB
REF
SETA
RFINA-
7
CSETH
TP11
U1
VCC
22
RFINB+
VCC
R4
23
VCC
OUTD
VCC VREF
24
VCC
SETD
A
25
FB1
RFINA+
C2
TP6
26
FA1
VCC
C1
OUTA
FA2
1
COR
C3
27
R6
VS
TP1
R2
C12
28
J1
SMA
RFINA
VCC
C5
VCC
C4
TP5
TP13
C13
C14
C17
R3
VOUTD
NOTE: VREF IS AN OUTPUT
FROM THE CHIP.
TP10
Figure 4. MAX2016 EV Kit Schematic
_______________________________________________________________________________________
5
Evaluates: MAX2016
MAX2016 Evaluation Kit
Figure 5. MAX2016 EV Kit Component Place Guide—Component Side
6
_______________________________________________________________________________________
MAX2016 Evaluation Kit
Evaluates: MAX2016
Figure 6. MAX2016 EV Kit PCB Layout—Top Silkscreen
Figure 7. MAX2016 EV Kit PCB Layout—Top Solder Mask
_______________________________________________________________________________________
7
Evaluates: MAX2016
MAX2016 Evaluation Kit
Figure 8. MAX2016 EV Kit PCB Layout—Top Layer Metal
Figure 9. MAX2016 EV Kit PCB Layout—Inner Layer 2 (GND)
Figure 10. MAX2016 EV Kit PCB Layout—Inner Layer 3
(Routes)
Figure 11. MAX2016 EV Kit PCB Layout—Bottom Layer Metal
8
_______________________________________________________________________________________
MAX2016 Evaluation Kit
Evaluates: MAX2016
Figure 12. MAX2016 EV Kit PCB Layout—Bottom Solder Mask
Figure 13. MAX2016 EV Kit PCB Layout—Bottom Silkscreen
Revision History
Pages changed at Rev 1: 1–9
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9
© 2006 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.