APPLICATION NOTE AND9314/D AX5043-1 DVK2b MODULE PERFORMANCE TX Revision 2 2 Table of Contents 1. Introduction................................................................................................ 3 2. DVK2b-AX5043-2 V1.3 868 MHz / NB Module ............................................. 4 2.1. Setup ........................................................................................................... 4 2.2. Output Power versus Power Setting and VDDIO ................................................. 4 2.3. Transmit Current versus Output Power ............................................................. 6 2.4. Output Power versus Frequency ...................................................................... 7 3. DVK2b-AX5043-2 V1.3 433 MHz / NB Module ............................................. 8 3.1. Setup ........................................................................................................... 8 3.2. Output Power versus Power Setting and VDDIO ................................................. 8 3.3. Transmit Current versus Output Power ............................................................ 10 3.4. Output Power versus Frequency ..................................................................... 11 4. DVK2-AX5043-LF2 V1.2 169 MHz / NB Module ......................................... 12 4.1. Setup .......................................................................................................... 12 4.2. Output Power versus Power Setting and VDDIO ................................................ 12 4.3. Transmit Current versus Output Power ............................................................ 14 4.4. Output Power versus Frequency ..................................................................... 15 www.onsemi.com AND9314/D Introduction 1. Introduction This application note documents output power and transmit currents versus frequency, power settings and VDDIO for the following AX5043 modules: DVK2b-AX5043-2 V1.3 868 MHz / NB, DVK2b-AX5043-2 V1.3 433 MHz / NB and DVK2-AX5043-LF2 V1.2 169 MHz / NB. www.onsemi.com AND9314/D 3 DVK2b-AX5043-2 V1.3 868 MHz / NB Module 2. DVK2b-AX5043-2 V1.3 868 MHz / NB Module 2.1. Setup RF Module DVK2b-AX5043-2 V1.3 868 MHz / NB with 16MHz TCXO unless stated otherwise. Using the internal VCO. Main Board DVK2b, powering the AX5043 via an external power supply Setup Software AX-RadioLAB_v2.1f Software Setup Basic & Regulatory Tests, Set Pattern, 10kbps GFSK, BT= 0.5. Output Power is varied by changing “Transmit Power” in the PHY panel, which determines the AX5043’s TXPWRCOEFFB setting. Output power is plotted against TXPWRCOEFFB, rather than the “transmit power” setting. RF Measurement equipment Huber & Suhner 10dB attenuator directly at the RF Module, 0.5m Huber & Suhner RG58 cable to Rhode & Schwarz FSEB spectrum analyzer. Measuring peak power with trace clear / write; RBW = 100kHz; detector AUTO SELECT, AUTO PEAK; ATTEN AUTO NORMAL Power levels are spectrum analyzer readings plus 11dB. 2.2. Output Power versus Power Setting and VDDIO TXPWR 868 MHz 20 TXPWR [dBm] diff @1.8V TXPWR [dBm] diff @ 3.0V TXPWR [dBm] s.e. @1.8V 15 TXPWR [dBm] s.e. @ 3.0V 10 TXPWR [dBm] 4 5 0 0 500 1000 1500 2000 2500 3000 3500 4000 4500 -5 -10 TXPOWRCOEFFB (decimal) Figure 1: Output power of the differential and single ended PA versus TXPWRCOEFFB register setting at 868.3MHz, VDDIO = 1.8V and 3.0V. www.onsemi.com AND9314/D DVK2b-AX5043-2 V1.3 868 MHz / NB Module TXPWR 16 15 TXPWR [dBm] 14 13 12 11 10 TXPWR differential PA 9 8 1.50 TXPWR single ended PA 1.70 1.90 2.10 2.30 2.50 2.70 2.90 VDDIO [V] Figure 2: Output power of the differential and single ended PA versus VDDIO for TXPWRCOEFFB=0xFFF (maximum power) at 868.3MHz. www.onsemi.com AND9314/D 5 DVK2b-AX5043-2 V1.3 868 MHz / NB Module 2.3. Transmit Current versus Output Power 70 I_TX differential PA @ 1.8V 60 I_TX differential PA @ 3.0V I_TX single ended PA @ 1.8V 50 I_TX [mA] 6 I_TX single ended PA @ 3.0V 40 30 20 10 0 -10 -5 0 5 10 15 20 TXPWR [dBm] Figure 3: Transmit current versus output power of the differential and single ended PA at 868.3MHz using a 16MHz TCXO. (TCXO current not included.) VDDIO = 1.8V and 3.0V. Note: This module is optimised for maximum output power. With a matching network optimised for 0dBm the transmit current at 0dBm is 8.5mA, rather than 12 – 15mA. www.onsemi.com AND9314/D DVK2b-AX5043-2 V1.3 868 MHz / NB Module 18 90 16 80 14 70 12 60 10 50 8 40 6 30 4 20 2 10 0 800 820 840 860 880 900 920 940 960 980 I_TX [mA] Output Power [dBm] 2.4. Output Power versus Frequency pwr [dBm] I_TX [mA] 0 1000 1020 1040 Frequency [MHz] Figure 4 Output power and transmit current versus frequency for TXPWRCOEFFB = 0xFFF (maximum power) using the differential PA and a 48MHz TCXO. (TCXO current not included.). VDDIO = 3.0V. www.onsemi.com AND9314/D 7 DVK2b-AX5043-2 V1.3 433 MHz / NB Module 3. DVK2b-AX5043-2 V1.3 433 MHz / NB Module 3.1. Setup RF Module DVK2b-AX5043-2 V1.3 433 MHz / NB with 16MHz TCXO unless stated otherwise. Using the internal VCO. Main Board DVK2b, powering the AX5043 via an external power supply Setup Software AX-RadioLAB_v2.1f Software Setup Basic & Regulatory Tests, Set Pattern, 10kbps GFSK, BT= 0.5. Output Power is varied by changing “Transmit Power” in the PHY panel, which determines the AX5043’s TXPWRCOEFFB setting. Output power is plotted against TXPWRCOEFFB, rather than the “transmit power” setting. RF Measurement equipment Huber & Suhner 10dB attenuator directly at the RF Module, 0.5m Huber & Suhner RG58 cable to Rhode & Schwarz FSEB spectrum analyzer. Measuring peak power with trace clear / write; RBW = 100kHz; detector AUTO SELECT, AUTO PEAK; ATTEN AUTO NORMAL Power levels are spectrum analyzer readings plus 10.75dB. 3.2. Output Power versus Power Setting and VDDIO TXPWR 433 MHz 20 TXPWR [dBm] diff @1.8V TXPWR [dBm] diff @ 3.0V TXPWR [dBm] s.e @1.8V 15 TXPWR [dBm] s.e. @ 3.0V 10 TXPWR [dBm] 8 5 0 0 500 1000 1500 2000 2500 3000 3500 4000 4500 -5 -10 TXPOWRCOEFFB (decimal) Figure 5: Output power of the differential and single ended PA versus TXPWRCOEFFB register setting at 433.15MHz, VDDIO = 1.8V and 3.0V. www.onsemi.com AND9314/D DVK2b-AX5043-2 V1.3 433 MHz / NB Module TXPWR 16 TXPWR differential PA TXPWR single ended PA 15 TXPWR [dBm] 14 13 12 11 10 1.50 1.70 1.90 2.10 2.30 2.50 2.70 2.90 VDDIO [V] Figure 6: Output power of the differential and single ended PA versus VDDIO for TXPWRCOEFFB=0xFFF (maximum power) at 433.15MHz. www.onsemi.com AND9314/D 9 DVK2b-AX5043-2 V1.3 433 MHz / NB Module 3.3. Transmit Current versus Output Power 70 I_TX differential PA @ 1.8V 60 I_TX differential PA @ 3.0V I_TX single ended PA @ 1.8V 50 I_TX [mA] 10 I_TX single ended PA @ 3.0V 40 30 20 10 0 -10 -5 0 5 10 15 20 TXPWR [dBm] Figure 7: Transmit current versus output power of the differential and single ended PA at 433.15MHz using a 16MHz TCXO. (The TCXO current is not included.) Note: This module is optimised for maximum output power. With a matching network optimised for 0dBm the transmit current at 0dBm is 8.5mA, rather than 12 – 15mA. www.onsemi.com AND9314/D DVK2b-AX5043-2 V1.3 433 MHz / NB Module 18 90 16 80 14 70 12 60 10 50 8 40 6 30 4 20 2 10 0 400 410 420 430 440 450 460 470 480 490 500 510 I_TX [mA] Output Power [dBm] 3.4. Output Power versus Frequency pw r [dBm] I_TX [mA] 0 520 frequency [MHz] Figure 8 Output power and transmit current versus frequency for TXPWRCOEFFB = 0xFFF (maximum power) using the differential PA and a 48MHz TCXO. (TCXO current not included.) VDDIO = 3.0V. www.onsemi.com AND9314/D 11 DVK2-AX5043-LF2 V1.2 169 MHz / NB Module 4. DVK2-AX5043-LF2 V1.2 169 MHz / NB Module 4.1. Setup RF Module DVK2-AX5043-LF2 V1.2 169 MHz / NB with 16MHz TCXO unless stated otherwise. Using VCO2 with external L. Main Board DVK2b with connectors for DVK2 modules added, powering the AX5043 via an external power supply Setup Software AX-RadioLAB_v2.1f Software Setup Basic & Regulatory Tests, Set Pattern, 10kbps GFSK, BT= 0.5. Output Power is varied by changing “Transmit Power” in the PHY panel, which determines the AX5043’s TXPWRCOEFFB setting. Output power is plotted against TXPWRCOEFFB, rather than the “transmit power” setting. RF Measurement equipment Huber & Suhner 10dB attenuator directly at the RF Module, 0.5m Huber & Suhner RG58 cable to Rhode & Schwarz FSEB spectrum analyzer. Measuring peak power with trace clear / write; RBW = 100kHz; detector AUTO SELECT, AUTO PEAK; ATTEN AUTO NORMAL Power levels are spectrum analyzer readings plus 10.5dB. 4.2. Output Power versus Power Setting and VDDIO TXPWR 169 MHz 20 TXPWR [dBm] diff @1.8V TXPWR [dBm] diff @ 3.0V TXPWR [dBm] s.e. @1.8V 15 TXPWR [dBm] s.e. @ 3.0V 10 TXPWR [dBm] 12 5 0 0 500 1000 1500 2000 2500 3000 3500 4000 4500 -5 -10 -15 TXPOWRCOEFFB (decimal) Figure 9: Output power of the differential and single ended PA versus TXPWRCOEFFB register setting at 169.3MHz, VDDIO = 1.8V and 3.0V. www.onsemi.com AND9314/D DVK2-AX5043-LF2 V1.2 169 MHz / NB Module TXPWR 16 TXPWR differential PA TXPWR single ended PA 15 TXPWR [dBm] 14 13 12 11 10 1.50 1.70 1.90 2.10 2.30 2.50 2.70 2.90 VDDIO [V] Figure 10: Output power of the differential and single ended PA versus VDDIO for TXPWRCOEFFB=0xFFF (maximum power) at 169.3MHz. www.onsemi.com AND9314/D 13 DVK2-AX5043-LF2 V1.2 169 MHz / NB Module 4.3. Transmit Current versus Output Power 45 40 35 30 I_TX [mA] 14 I_TX differential PA @ 1.8V I_TX differential PA @ 3.0V I_TX single ended PA @ 1.8V I_TX single ended PA @ 3.0V 25 20 15 10 5 0 -15 -10 -5 0 5 10 15 20 TXPWR [dBm ] Figure 11: Transmit current versus output power of the differential and single ended PA at 169.3MHz using a 16MHz TCXO. (The TCXO current is not included.) Note: This module is optimised for maximum output power. With a matching network optimised for 0dBm the transmit current at 0dBm is 5mA, rather than 9-10mA. www.onsemi.com AND9314/D DVK2-AX5043-LF2 V1.2 169 MHz / NB Module 18 45 16 40 14 35 12 30 10 25 8 20 6 15 4 10 2 5 0 156 158 160 162 164 166 168 170 172 I_TX [mA] Output Power [dBm] 4.4. Output Power versus Frequency pw r [dBm] I_TX [mA] 0 174 frequency [MHz] Figure 12 Output power and transmit current versus frequency for TXPWRCOEFFB = 0xFFF (maximum power) using the differential PA and a 48MHz TCXO. (TCXO current not included.) VDDIO = 3.0V. www.onsemi.com AND9314/D 15