Texas Instruments | DN037 -- Measurement Results for Combined CC2530 and CC2590 Solution | Application notes | Texas Instruments DN037 -- Measurement Results for Combined CC2530 and CC2590 Solution Application notes

Texas Instruments DN037 -- Measurement Results for Combined CC2530 and CC2590 Solution Application notes
Design Note DN037
Measurement Results for Combined CC2530 and CC2590
Solution
By Sverre Hellan
Keywords
CC2530
CC2531
CC2590
Range Extender
1
External LNA
External PA
2.4 GHz IEEE 802.15.4 systems
Introduction
CC2530 [1] is TI's second generation
ZigBee® / IEEE 802.15.4 RF System-onChip (SoC) for the 2.4 GHz unlicensed
SRD/ISM band. This chip enables
industrial grade applications by offering
state-of-the-art
selectivity/co-existence,
excellent link budget, and low voltage
operation. The CC2531 is identical to the
CC2530 with the addition of an USB
interface
CC2590 [2] is a range extender for 2.4GHz RF transceivers, transmitters and
SoC products from Texas Instruments.
CC2590 increases the link budget by
providing a Power Amplifier (PA) for higher
output power and a Low Noise Amplifier
(LNA) for improved receiver sensitivity.
CC2590 further contains RF switches, RF
matching, and a balun.
This design note gives measurement
results for the combined CC2530-CC2590
o
o
solution at 3 V operation, -40 C, +25 C,
SWRA375
o
and +85 C. The following parameters were
measured:
Sensitivity
RX current
Output power and harmonics
TX current
Error Vector Magnitude (EVM)
Stability vs load impedance
The results presented are the average
numbers from measurements on 11
PCB’s. The results presented are specified
by test and should only be used as an
indication of expected performance.
The
combined
CC2530-CC2590
schematic is shown in Appendix – CC2530
and CC2590 Schematic.
The RF front end of CC2530 is the same
as in CC2531. The presented results in
this application note are therefore also
valid for CC2531.
Page 1 of 10
Design Note DN037
Table of Contents
KEYWORDS .............................................................................................................................. 1
1
INTRODUCTION ............................................................................................................. 1
2
ABBREVIATIONS............................................................................................................ 2
3
RX MEASUREMENTS .................................................................................................... 3
3.1
SENSITIVITY (1% PER) .............................................................................................. 3
3.2
RX CURRENT VS INPUT POWER LEVEL ........................................................................ 3
4
TX MEASUREMENTS ..................................................................................................... 4
4.1
OUTPUT POWER AND HARMONICS .............................................................................. 4
4.2
TX CURRENT ............................................................................................................. 5
4.3
ERROR VECTOR MAGNITUDE (EVM) ........................................................................... 6
4.4
TYPICAL TX PARAMETERS VS. LOAD IMPEDANCE ......................................................... 7
5
REFERENCES................................................................................................................. 9
6
GENERAL INFORMATION ............................................................................................. 9
6.1
DOCUMENT HISTORY .................................................................................................. 9
APPENDIX – CC2530 AND CC2590 SCHEMATIC................................................................. 10
2
EVM
ISM
MHz
RF
RX
SRD
TX
Abbreviations
Error Vector Magnitude
Industrial, Scientific, Medical
Mega Hertz
Radio Frequency
Receive
Short Range Devices
Transmit
SWRA375
Page 2 of 10
Design Note DN037
3
3.1
RX Measurements
Sensitivity (1% PER)
-40C
-99.6
2405 MHz
+25C
+85C
-98.0
-95.7
2440 MHz
+25C
+85C
-40C
-98.9
-97.4
-94.8
-40C
-99.8
2480 MHz
+25C
+85C
-98.2
-95.8
Table 3.1. Sensitivity [dBm]. 3 V Supply Voltage
3.2
RX Current vs Input Power Level
RX current is measured with CC2530 waiting for sync and CPU idle.
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
-40C
+25C
+85C
26.5
26.5
26.2
24.7
24.1
23.7
23.6
23.6
24.3
28.1
28.2
28.2
28.2
25.9
25.3
24.6
24.4
24.4
24.7
27.1
29.9
29.8
28.1
27.5
26.1
25.4
25.4
25.4
25.6
27.2
Table 3.2. RX Current [mA] vs Input Power Level [dBm]. 3 V Supply Voltage
SWRA375
Page 3 of 10
Design Note DN037
4
4.1
TX Measurements
Output Power and Harmonics
-40C
0xF5
0xE5
0xD5
0xC5
0xB5
0xA5
0x95
0x85
0x75
0x65
0x55
0x45
0x35
0x35
0x15
0x05
13.2
12.1
11.1
10.2
9.5
8.5
6.7
5.6
3.8
2.0
-0.2
-2.6
-5.1
-6.8
-8.9
-11.0
2405 MHz
+25C
+85C
11.4
9.7
8.2
6.9
5.8
4.2
2.2
1.0
-0.5
-2.2
-4.3
-6.7
-9.1
-10.7
-12.8
-14.9
8.3
6.2
4.3
2.8
1.5
-0.2
-2.1
-3.4
-5.0
-6.6
-8.6
-10.8
-13.1
-14.6
-16.6
-18.7
-40C
2440 MHz
+25C
+85C
13.0
11.8
10.7
9.8
9.1
7.9
6.0
4.9
3.1
1.3
-0.9
-3.3
-5.8
-7.4
-9.6
-11.7
11.1
9.3
7.7
6.4
5.2
3.6
1.6
0.4
-1.1
-2.9
-5.0
-7.3
-9.7
-11.3
-13.3
-15.4
7.8
5.6
3.7
2.1
0.9
-0.8
-2.7
-4.1
-5.6
-7.2
-9.2
-11.4
-13.7
-15.2
-17.1
-19.2
-40C
12.1
10.8
9.7
8.8
7.9
6.6
4.6
3.5
1.7
-0.2
-2.4
-4.8
-7.3
-8.9
-11.0
-13.0
2480 MHz
+25C
+85C
10.1
8.2
6.5
5.1
3.9
2.2
0.2
-1.0
-2.6
-4.3
-6.3
-8.7
-11.0
-12.6
-14.6
-16.7
6.8
4.4
2.4
0.9
-0.4
-2.2
-4.1
-5.4
-6.9
-8.5
-10.5
-12.7
-14.9
-16.4
-18.3
-20.5
Table 4.1. Output Power [dBm] vs CC2530 TXPOWER. 3 V Supply Voltage
-40C
0xF5
0xE5
0xD5
0xC5
0xB5
0xA5
0x95
0x85
0x75
0x65
0x55
0x45
0x35
0x35
0x15
0x05
-37.6
-42.7
-48.4
-55.4
-60.5
-57.9
-55.2
-55.9
-58.0
-60.7
-64.3
-68.8
-73.7
-76.8
-81.1
-85.2
2405 MHz
+25C
+85C
-47.2
-59.8
-61.1
-58.3
-58.3
-59.8
-62.6
-64.4
-67.1
-70.2
-74.0
-78.4
-82.6
-85.6
-88.9
-91.5
nd
Table 4.2. Conducted 2
-66.7
-62.7
-62.9
-64.5
-66.4
-69.0
-72.2
-74.2
-77.0
-79.7
-82.8
-86.2
-88.7
-90.3
-91.9
-92.7
-40C
2440 MHz
+25C
+85C
-43.5
-49.2
-56.7
-62.5
-62.1
-58.1
-57.9
-59.0
-61.3
-64.0
-67.7
-72.0
-76.6
-79.5
-83.1
-86.0
-54.1
-66.4
-60.8
-59.4
-60.2
-62.2
-65.0
-67.0
-69.7
-72.6
-76.4
-80.3
-83.9
-85.7
-87.7
-89.5
-67.5
-63.3
-64.5
-66.5
-68.6
-71.4
-74.7
-77.1
-79.6
-82.2
-85.4
-88.2
-90.3
-91.7
-93.0
-93.7
-40C
-46.3
-53.0
-60.8
-63.1
-59.2
-57.4
-58.9
-60.2
-62.5
-65.3
-68.9
-73.0
-76.8
-79.3
-82.0
-84.3
2480 MHz
+25C
+85C
-59.2
-64.3
-59.5
-59.8
-61.0
-63.2
-66.3
-68.3
-71.1
-74.2
-77.9
-81.7
-85.3
-87.1
-88.9
-90.4
-65.2
-63.2
-65.3
-67.6
-69.7
-72.9
-76.4
-78.9
-81.6
-84.7
-88.4
-91.9
-95.5
-97.1
-98.4
-100.0
Harmonic [dBm] vs CC2530 TXPOWER. 3 V Supply Voltage
nd
o
Radiated 2 harmonic at maximum output power is typically below -39 dBm at 25 C. A Titanis 2.4
GHz swivel antenna from Antenova [3] was used in the measurement.
SWRA375
Page 4 of 10
Design Note DN037
-40C
0xF5
0xE5
0xD5
0xC5
0xB5
0xA5
0x95
0x85
0x75
0x65
0x55
0x45
0x35
0x35
0x15
0x05
-47.6
-48.9
-50.3
-52.0
-54.0
-57.7
-63.8
-66.8
-71.0
-74.7
-80.2
-86.1
-91.9
-94.2
-97.3
-99.9
2405 MHz
+25C
+85C
-52.6
-56.2
-60.5
-64.4
-68.0
-72.2
-77.0
-80.0
-84.3
-87.8
-91.7
-95.3
-97.9
-100.1
-100.4
-103.5
-59.9
-66.6
-72.6
-76.8
-80.0
-84.7
-88.7
-90.0
-93.6
-95.0
-96.3
-100.0
-100.2
-103.1
-105.4
-106.3
-40C
-50.7
-51.7
-53.6
-55.7
-58.0
-62.3
-67.4
-69.8
-73.6
-77.0
-82.5
-88.3
-93.1
-94.5
-97.9
-99.9
2440 MHz
+25C
+85C
-52.9
-56.8
-61.4
-65.3
-68.8
-72.6
-77.1
-80.5
-84.0
-87.9
-92.7
-94.9
-97.8
-99.2
-100.0
-104.7
-60.2
-67.0
-72.7
-76.2
-80.1
-84.7
-87.8
-91.2
-93.6
-94.8
-97.6
-100.2
-101.7
-103.9
-105.1
-107.8
-40C
-48.6
-49.8
-51.9
-54.3
-57.2
-61.1
-65.7
-67.8
-71.5
-75.9
-81.2
-87.1
-92.2
-96.7
-99.0
-100.5
2480 MHz
+25C
+85C
-51.6
-55.7
-60.6
-64.6
-67.5
-71.3
-76.6
-79.7
-83.1
-88.0
-91.9
-95.6
-99.5
-100.7
-103.2
-105.4
-61.9
-68.8
-74.7
-78.7
-81.8
-86.1
-90.3
-93.1
-94.5
-96.5
-99.1
-100.3
-103.2
-105.8
-105.1
-109.8
rd
Table 4.3. Conducted 3 Harmonic [dBm] vs CC2530 TXPOWER. 3 V Supply Voltage
rd
o
Radiated 3 harmonic at maximum output power is typically below -35 dBm at 25 C. A Titanis 2.4
GHz swivel antenna from Antenova [3] was used in the measurement.
4.2
TX Current
-40C
0xF5
0xE5
0xD5
0xC5
0xB5
0xA5
0x95
0x85
0x75
0x65
0x55
0x45
0x35
0x35
0x15
0x05
67.5
57.9
52.4
49.0
46.1
43.2
39.3
37.8
35.7
34.0
32.6
31.6
31.0
30.8
30.6
29.3
2405 MHz
+25C
+85C
59.4
50.9
46.2
43.5
41.1
39.0
36.5
35.6
34.6
33.8
33.2
32.7
32.5
32.3
32.2
31.0
52.5
45.8
42.4
40.7
39.1
38.0
36.4
36.0
35.4
35.0
34.7
34.5
34.3
34.2
34.2
33.0
-40C
2440 MHz
+25C
+85C
67.0
57.5
52.0
48.7
45.6
42.8
38.9
37.4
35.3
33.7
32.4
31.5
30.9
30.7
30.5
29.2
59.0
50.6
45.9
43.2
40.7
38.7
36.3
35.4
34.4
33.6
33.0
32.6
32.4
32.3
32.1
30.9
52.2
45.5
42.1
40.4
38.9
37.8
36.3
35.8
35.3
34.9
34.6
34.4
34.2
34.1
34.1
32.9
-40C
67.2
57.7
52.0
48.6
45.5
42.5
38.7
37.2
35.2
33.6
32.3
31.5
30.9
30.7
30.5
29.2
2480 MHz
+25C
+85C
59.0
50.4
45.7
43.0
40.6
38.6
36.2
35.3
34.4
33.6
33.1
32.7
32.4
32.3
32.2
31.0
52.0
45.4
42.0
40.3
38.8
37.7
36.3
35.8
35.3
34.9
34.6
34.4
34.3
34.2
34.1
32.9
Table 4.4. TX Current [mA] vs CC2530 TXPOWER. 3 V Supply Voltage
SWRA375
Page 5 of 10
Design Note DN037
4.3
Error Vector Magnitude (EVM)
-40C
0xF5
0xE5
0xD5
0xC5
0xB5
0xA5
0x95
0x85
0x75
0x65
0x55
0x45
0x35
0x35
0x15
0x05
14.0
6.5
3.9
2.6
2.3
2.1
2.1
2.2
2.1
1.9
1.8
2.0
2.2
2.5
3.0
3.7
2405 MHz
+25C
+85C
5.6
2.6
2.1
2.0
2.0
2.1
2.0
2.1
1.9
1.8
1.8
1.8
2.0
2.3
2.7
3.3
3.1
2.1
2.1
2.2
2.1
2.1
2.1
2.1
2.0
1.9
1.9
1.9
2.0
2.2
2.5
3.0
-40C
2440 MHz
+25C
+85C
8.5
3.6
2.5
2.1
2.0
2.1
2.2
2.3
2.1
2.0
1.9
2.0
2.4
2.7
3.3
4.0
3.7
2.2
2.0
2.1
2.0
2.1
2.0
2.1
1.9
1.8
1.8
1.9
2.2
2.4
2.9
3.5
2.6
2.1
2.1
2.1
2.1
2.1
2.1
2.1
2.0
1.9
1.9
2.0
2.1
2.3
2.6
3.2
-40C
4.0
2.4
2.3
2.1
2.2
2.3
2.2
2.3
2.1
2.0
2.1
2.3
2.7
3.2
3.9
4.8
2480 MHz
+25C
+85C
3.6
2.3
2.2
2.1
2.0
2.1
2.0
2.1
2.0
1.9
1.9
2.1
2.4
2.7
3.3
4.1
2.7
2.1
2.1
2.1
2.1
2.1
2.1
2.1
2.0
2.0
2.0
2.1
2.3
2.5
3.0
3.6
Table 4.5. EVM [%] vs CC2530 TXPOWER. 3 V Supply Voltage
-40C
0xF5
0xE5
0xD5
24.1
10.8
6.3
2405 MHz
+25C
+85C
8.8
3.7
2.6
3.7
2.6
2.7
-40C
2440 MHz
+25C
+85C
14.1
5.7
3.5
6.0
3.3
2.5
3.3
2.6
2.7
-40C
6.2
3.5
3.4
2480 MHz
+25C
+85C
5.2
3.2
2.7
3.5
2.6
2.7
Table 4.6. Maximum EVM [%] vs CC2530 TXPOWER. 3 V Supply Voltage
SWRA375
Page 6 of 10
Design Note DN037
4.4
Typical TX Parameters vs. Load Impedance
The load impedance presented to the CC2590 PA output is critical to the TX performance. The
load impedance is selected as a compromise between several criteria, such as output power,
efficiency and the level of the harmonics. The matching components between the PA output and
the antenna should transform 50 ohm antenna impedance to the selected impedance which the
CC2590 PA should see. This is taken care of by the reference design (see Appendix) and the user
should provide a well matched antenna to get the required performance.
In order to measure the performance under different mismatch conditions the CC2530-CC2590
design is loaded with different impedances at the SMA connector reference plane. A well matched
antenna will have impedance inside the black circle in the Smith chart, which illustrates the limit for
10 dB return loss. At each load the output power, current and spurious frequency components are
measured. These measurements are known as load-pull measurements.
Output power (dBm)
Current (mA)
10
71
Temp = 25 C
Vdd = 3 V
70
Temp = 25 C
Vdd = 3 V
8
69
6
68
67
4
66
2
65
64
0
63
-2
62
Return Loss: 10 dB
Return Loss: 10 dB
Figure 4.1. Current (left) and Output Power (right) vs. Load Impedance at SMA Connector at
25°C, 3 V. TXPOWER = 0xFE.
Most PAs have the ability to oscillate at unwanted frequencies under certain conditions. The worst
conditions are usually high output power, low temperatures, and high VDD. This is also the case
for CC2590. The spurious frequency components are measured under different mismatch
conditions as illustrated in Figure 4.2 and Figure 4.3 from DC to f0 (fundamental) and from f0 to
nd
2f0 (2 harmonic). The plots show that the spurious level is low and there are no oscillations. The
CC2530-CC2590 solution is a very robust design which tolerates high mismatch ratios at high
output power, low temperatures at 3 V supply voltage.
Spur DC to fundamental (dBm)
Spur f0 to 2f0
-52
Temp = 25 C
Vdd = 3 V
-53
-49
Temp = 25 C
Vdd = 3 V
-50
-54
-51
-55
-52
-56
-53
-57
-54
-58
-55
-59
-56
-60
-57
-61
-58
-59
-62
VSWR: 10
Return Loss: 1.7 dB
VSWR: 10
Return Loss: 1.7 dB
-60
Figure 4.2. Spurious Frequency Components vs. Load Impedance at SMA Connector at 25°C,
3 V. TXPOWER = 0xFE.
SWRA375
Page 7 of 10
Design Note DN037
Spur DC to fundamental (dBm)
Spur f0 to 2f0
-42
Temp = -40 C
Vdd = 3 V
-44
-40
Temp = -40 C
Vdd = 3 V
-42
-46
-44
-48
-46
-50
-48
-52
-50
-54
-52
-56
-54
-58
-56
-60
VSWR: 10
Return Loss: 1.7 dB
-62
-58
VSWR: 10
Return Loss: 1.7 dB
-60
Figure 4.3. Spurious Frequency Components vs. Load Impedance at SMA Connector at -40°C,
3 V. TXPOWER = 0xFE.
SWRA375
Page 8 of 10
Design Note DN037
5
References
[1]
CC2530 Data sheet
[2]
CC2590 Data sheet
[3]
Antenova Titan 2.4 GHz swivel antenna
6
6.1
General Information
Document History
Revision
SWRA375
Date
2011.07.28
Description/Changes
Initial release
SWRA375
Page 9 of 10
Design Note DN037
Appendix – CC2530 and CC2590 Schematic
SWRA375
Page 10 of 10
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Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Applications
Audio
www.ti.com/audio
Automotive and Transportation www.ti.com/automotive
Amplifiers
amplifier.ti.com
Communications and Telecom www.ti.com/communications
Data Converters
dataconverter.ti.com
Computers and Peripherals
www.ti.com/computers
DLP® Products
www.dlp.com
Consumer Electronics
www.ti.com/consumer-apps
DSP
dsp.ti.com
Energy and Lighting
www.ti.com/energy
Clocks and Timers
www.ti.com/clocks
Industrial
www.ti.com/industrial
Interface
interface.ti.com
Medical
www.ti.com/medical
Logic
logic.ti.com
Security
www.ti.com/security
Power Mgmt
power.ti.com
Space, Avionics and Defense
www.ti.com/space-avionics-defense
Microcontrollers
microcontroller.ti.com
Video and Imaging
www.ti.com/video
RFID
www.ti-rfid.com
OMAP Mobile Processors
www.ti.com/omap
Wireless Connectivity
www.ti.com/wirelessconnectivity
TI E2E Community Home Page
e2e.ti.com
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