1
DEMO MANUAL DC2870A
Rev. 0
DESCRIPTION
LTC5596
Linduino Shield 100MHz to 40 GHz
RMS Power Detector
Demonstration circuit DC2870A is a Linduino
®
shield for
Mean-Squared Power Detector LTC
®
5596. It is set up for
quick evaluation of RMS RF power measurement using
the Arduino/Linduino compatible platform and software
download available here. When connected to PC with USB
cable, accurate power level can be monitored using the
graphic user interface.
The LTC5596 is a wide dynamic range linear-in-dB Mean
Squared RF Power Detector, operational from 100MHz to
40GHz. The Linduino (DC2026C) platform provides 10-bit
ADC at 4.9mV/LSB resolution with 5V default reference
voltage. Input dynamic range with 1dB accuracy is up
to 35dB depending on frequency. The detector output
slope is normally 6 LSB/dB. The DC2870A Demo Circuit
is optimized for wide operational frequency signals up
to 40GHz using the 2.9mm SMK edge mount connector.
Input impedance is internally matched to 50Ω. It is suit-
able for RMS measurements of high crest factor wave-
forms up to 12dB peak-to-average. No external coupling
capacitor is necessary if DC voltage at RFIN pin is kept
below 1.0V. On board 3.3V regulator provides power to
All registered trademarks and trademarks are the property of their respective owners.
(Note 1)
Supply Voltage(VCC): +3.8V
DC Voltage at RFIN: –0.3V to 1.0V
DC Voltage at FLTR: –0.3V to 0.4V
DC Voltage at EN: –0.3V to 3.8V
RFIN Input Power-Average: +15dBm
TJMAX 150°C
Case Operating Temperature Range –40°C to 105°C
Storage Temperature Range –65°C to 150°C
Note 1: Voltage on all pins must not exceed VCC+0.3V
or be less than –0.3V.
CAUTION: This part is sensitive to electrostatic discharge
(ESD). Observe proper ESD precautions when handling
the LTC5596.
TEST SETUP
ABSOLUTE MAXIMUM INPUT RATINGS
the shield by jumper JP1. Contact applications support
for more information.
Design files for this circuit board are available.
Figure1. Test Setup for RF Performance Measurements
2
DEMO MANUAL DC2870A
Rev. 0
NOTES ON TEST EQUIPMENT AND SETUP
1. Remove the DC2870A from its protective packaging
in an ESD-safe working area, connect USB cable to
PC(see Figure1).
2. Set JP1 which provides the 3.3V to VCC by the on board
regulator.
3. Go to www.analog.com, download and install QuikEval
if it’s not yet installed.
4. The Eval Kit comes with a Linduino board pre-loaded
with firmware. Follow Figure2 to re-load the firmware
if necessary, which can be downloaded from www.
analog.com.
5. Download LTC5596 GUI, and install all necessary driv-
ers onto PC from the LTC5596 product page. Follow
instruction from QuikEval which will automatically
download the GUI.
6. Connect USB cable from PC to Linduino board. Con-
nect the RF input to the signal generator at the 2.92mm
connector
7. Set the frequency and power level (less than +10dBm)
of the signal generator.
8. Open LTC5596 GUI, and set the frequency of signal to
be measured. Push “READ” to measure RF power. Us-
ing the default calibration would be loading the nominal
slope and intercept from LTC5596 data sheet values.
See Figure3.
9. For higher accuracy, Calibration can be performed using
the GUI at various frequency with two point calibration.
Set input power level to the corresponding calibration
points on the GUI, and calibrate accordingly by clicking
the corresponding button.
10. Read RF power using the GUI.
QUICK START PROCEDURE
DEMO BOARD USAGE NOTES
n
Use a high performance signal generator with accu-
rate output power levels up to 40GHz, such as Rohde
Schwarz SMF100A.
n Demo Board DC2870A includes the SMK 2.9mm con-
nector for best performance up to 40GHz.
n Connecting cable for RF signal should be rated up to
40GHz for the best performance.
n
Optional input attenuation can be used to improve
return loss, but also shifts the log intercept point
accordingly.
1. Demo Board DC2870A has provisions for inter-stage
filter cap. Additional capacitor (C3) can be added to
slow down the transient response to reduce the output
ripple. The range for C3 is 10pF to 1nF.
2. Output power is calculated using slope and intercept.
3. ADC count • 4.9mV/slope+intercept=output power.
Slope is derived from two point calibration in the linear
region of transfer function.
4. A minimum two point calibration is necessary for most
applications. Additional calibration points will improve
the accuracy of the power detection.
3
DEMO MANUAL DC2870A
Rev. 0
Figure3. GUI
Figure4. Calibration
DEMO BOARD USAGE NOTES
Figure2. Firmware Re-Load (Only If Necessary)
4
DEMO MANUAL DC2870A
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C1 CAP., CX Series, (16kHz to 40GHz), 0.1µF, YD, 16V,
10%, 0402
AVX, CX02YD104KAT2
2 2 C3, C14 CAP., 0.01µF, X7R, 16V, 10%, 0402 MURATA, GRM155R71C103KA01D
NIC, NMC0402X7R103K16TRPF
3 1 C4 CAP., 1µF, X5R, 10V, 10%, 0402 MURATA, GRM155R61A105KE15D
AVX, 0402ZD105KAT2
TDK, C1005X5R1A105K050BB
4 1 C8 CAP., 10pF, NP0, 50V, 10%, 0402 AVX, 04025A100KAT2A
5 0 C10 CAP., OPTION, 0402
6 2 C11, C15 CAP., 0.1µF, X7R, 16V, 10%, 0402 AVX, 0402YC104KAT2A
Taiyo Yuden, EMK105B7104KV-F
TDK, C1005X7R1C104K050BC
7 2 C12, C13 CAP CER 10UF 6.3V X5R 0402 TDK Corporation, C1005X5R0J106M050BC
8 5 E1, E2, E3, E4, E5 TEST POINT, TURRET, 0.064", MTG. HOLE MILL-MAX, 2308-2-00-80-00-00-07-0
9 1 J1 CONN., SMA, 2.9mm, JACK TO EDGE LUNCH,
DC-40GHz
SRI CONNECTOR GAGE, 25-146-1000-93
10 1 J2 CONN., HDR, FEMALE, 1x10, 2.54mm, THT, STR SULLINS CONNECTOR SOLUTIONS, PPPC101LFBN-RC
11 2 J3, J4 CONN., HDR, FEMALE, 1x8, 2.54mm, STR, THT SULLINS CONNECTOR SOLUTIONS, PPPC081LFBN-RC
12 1 J5 CONN., HDR., FEMALE, 1x6, 2.54mm, THT, STR SULLINS CONNECTOR SOLUTIONS, PPPC061LFBN-RC
13 1 J6 CONN., TERM. BLOCK, RCPT, 1x2, 5mm, SIDE ENTRY,
THT
TE CONNECTIVITY, 282836-2
14 2 JP1, JP2 CONN., HDR, MALE, 1x2, 2mm, VERT, STR, THT, 10u"
AU
SAMTEC, TMM-102-02-L-S
15 1 LB1 LABEL SPEC, DEMO BOARD SERIAL NUMBER BRADY, THT-96-717-10
16 1 PCB1 PCB, DC2870A ANALOG DEVICES INC., 600-DC2870A
17 1 R1 RES., AEC-Q200, 2k OHMS, 1%, 1/16W, 0402 VISHAY, CRCW04022K00FKED
NIC, NRC04F2001TRF
18 1 R2 RES., 1 OHM, 1%, 1/16W, 0402 VISHAY, CRCW04021R00FKED
19 0 R8, R14 RES., OPTION, 0402
20 3 R9, R10, R11 RES., 4.99k OHMS, 1%, 1/16W, 0402 NIC, NRC04F4991TRF
VISHAY, CRCW04024K99FKED
YAGEO, RC0402FR-074K99L
21 1 R12 RES., 100 OHMS, 1%, 1/16W, 0402 NIC, NRC04F1000TRF
YAGEO, RC0402FR-07100RL
22 1 R13 RES., 3k OHMS, 5%, 1/16W, 0402 VISHAY, CRCW04023K00JNED
23 1 STNCL1 TOOL, STENCIL, 700-DC2870A ANALOG DEVICES INC., 830-DC2870A
24 1 U1 IC, 100MHz to 40GHz Linear-in-dB RMS Power
Detector with 35dB Dynamic Range
LINEAR TECH, LTC5596_DC#PBF
25 1 U2 IC, LOW NOISE, LDO MICROPOWER REG., TSOT23-5 LINEAR TECH., LT1761ES5-3.3#PBF
LINEAR TECH., LT1761ES5-3.3#TRPBF
26 1 U3 IC, MEMORY, EEPROM, 2Kb (256x8), TSSOP-8,
400kHz
MICROCHIP, 24LC025-I/ST
MICROCHIP, 24LC025T-I/ST
5
DEMO MANUAL DC2870A
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications
subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
1. ALL RESISTORS ARE IN OHMS, 0402
2. ALL CAPACITORS ARE IN MICROFARADS, 0402
NOTE: UNLESS OTHERWISE SPECIFIED
PCA ADDITIONAL PARTS
3.3V
5V
3.3V5V
5V
3.3V
3.3V
DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES.
APP ENG.
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONESIZE:
SKU NO. SCHEMATIC NO. AND REVISION:
PCA BOM:
PCA ASS'Y:
TM
DEVICES
Milpitas, CA 95035
Fax: (408)434-0507
www.analog.com
Phone: (408)432-1900
ANALOG
1630 McCarthy Blvd.
AHEAD OF WHAT'S POSSIBLE
11
AK
ANDY M.
LTC5596
RMS POWER DETECTOR
DC2870A
700-DC2870A_REV01
710-DC2870A_REV01
705-DC2870A_REV01
N/A DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES.
APP ENG.
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONESIZE:
SKU NO. SCHEMATIC NO. AND REVISION:
PCA BOM:
PCA ASS'Y:
TM
DEVICES
Milpitas, CA 95035
Fax: (408)434-0507
www.analog.com
Phone: (408)432-1900
ANALOG
1630 McCarthy Blvd.
AHEAD OF WHAT'S POSSIBLE
11
AK
ANDY M.
LTC5596
RMS POWER DETECTOR
DC2870A
700-DC2870A_REV01
710-DC2870A_REV01
705-DC2870A_REV01
N/A DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES.
APP ENG.
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONESIZE:
SKU NO. SCHEMATIC NO. AND REVISION:
PCA BOM:
PCA ASS'Y:
TM
DEVICES
Milpitas, CA 95035
Fax: (408)434-0507
www.analog.com
Phone: (408)432-1900
ANALOG
1630 McCarthy Blvd.
AHEAD OF WHAT'S POSSIBLE
11
AK
ANDY M.
LTC5596
RMS POWER DETECTOR
DC2870A
700-DC2870A_REV01
710-DC2870A_REV01
705-DC2870A_REV01
N/A
C15
0.1uF
J1
25-146-1000-93
DC-40GHz
R11
4.99k
R9
4.99k
E4
EN
R2 1
C8
10pF
JP1 HDR
12
R14
OPT
E2
GND
C3
0.01uF
PCB1
PCB, DC2870A REV01
LB1 LABEL
R8
OPT
U3
24LC025-I/ST
SDA 5
VCC 8
A0
1
A1
2
A2
3
VSS
4
WP 7
SCL 6
R13
3k
J3
HDR-FEMALE
DIGITAL
1
2
3
4
5
6
7
8
STNCL1
TOOL, STENCIL, 700-DC2870A REV01
C13
10uF
JP2 HDR
12
E3
GND
R10
4.99k
U1
LTC5596_DC
VCC
1
OUT
2
FLTR
3
GND
4GND 5
RFin 6
GND 7
EN 8
GND
9
C1
0.1uF
40GHz
R12 100
J5
HDR-FEMALEANALOG IN
1
2
3
4
5
6
C14
0.01uF
J6
TE-282836-2
TERM. BLOCK
1
2
C11 0.1uF
C4
1uF
10V
X1
U2
LT1761-S5-3.3
GND
2
BYP 4
IN
1VOUT 5
SHDN
3
E1
3.3V
X2
E5
VOUT
R1
2k
J2
HDR-FEMALE
1
2
3
4
5
6
7
8
9
10
C10
OPT
J4
HDR-FEMALE POWER
1
2
3
4
5
6
7
8
C12
10uF
X3
EN
A0
SCL
SDA
EGND
AREF
6
DEMO MANUAL DC2870A
Rev. 0
ANALOG DEVICES, INC. 2018
10/18
www.analog.com
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
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