TRF3722EVM

User's Guide SLOU385 – May 2014 TRF3722 EVM User's Guide TRF3722 is a high performance direct conversion quadrature modulator with exceptional linearity and low noise performance. The TRF3722 converts low frequency baseband signals to high frequency RF signals and integrates PLL and VCO to provide the local oscillator (LO) to the integrated modulator. This document provides the operating procedures of the TRF3722 evaluation module (EVM). 1 2 3 4 5 Contents Introduction ................................................................................................................... 2 GUI Installation ............................................................................................................... 2 2.1 GUI Details .......................................................................................................... 4 EVM Jumper Configuration ................................................................................................. 4 3.1 Board Power-up ..................................................................................................... 5 3.2 Modulator Linearity Validation ..................................................................................... 6 EXT_VCO Modulator Linearity Validation ................................................................................ 9 Phase Noise Validation - Integer Mode ................................................................................. 11 5.1 Phase Noise Validation - Fractional Mode ..................................................................... 14 List of Figures 1 TRF3722EVM Board Photo ................................................................................................ 2 2 GUI Installer Initialization 3 Directory Installation Windows ............................................................................................. 3 4 GUI Warning .................................................................................................................. 4 5 Voltage Supply Inputs ....................................................................................................... 5 6 GUI Settings (a) .............................................................................................................. 6 7 GUI Settings (b) .............................................................................................................. 7 8 TRF3722 EVM 9 10 11 12 13 14 15 16 17 18 19 ................................................................................................... 3 ............................................................................................................... 7 TRF3722 OIP3 ............................................................................................................... 8 TRF3722 GUI, Ext VCO Configuration (a) .............................................................................. 10 TRF3722 GUI, Ext VCO Configuration (b) .............................................................................. 10 Integer Mode Loop Filter .................................................................................................. 11 Integer Mode Loop Filter (a) .............................................................................................. 12 Integer Mode Loop Filter (b) .............................................................................................. 12 Integer Mode Phase Noise at 1800 MHz ............................................................................... 13 Fractional Mode Loop Filter ............................................................................................... 14 Fractional Mode Loop Filter (a) ........................................................................................... 15 Fractional Mode Loop Filter (b) ........................................................................................... 15 Fractional Phase Noise at 3532.9 MHz ................................................................................. 16 List of Tables 1 Default Jumper Connections ............................................................................................... 4 SLOU385 – May 2014 Submit Documentation Feedback TRF3722 EVM User's Guide Copyright © 2014, Texas Instruments Incorporated 1 Introduction 1 www.ti.com Introduction TRF3722 is a quadrature modulator with integrated PLL and VCO. The typical 0.25-V baseband common mode voltage supports seamless interface with current sourcing DACs. The PLL and VCO provides excellent phase noise. The device also provides additional LO output for driving a second modulator or down converting mixer. The modulator features a high gain mode along with a low power mode when power optimization is desired. Figure 1 shows the TRF3722 EVM. Figure 1. TRF3722EVM Board Photo 2 GUI Installation Install the GUI using the following steps: 1. This is a one-time installation. Download the TRF3722 GUI (SLOC306) from the TI website. 2. Run SETUP from the TRF3722GUI_Installer/Volume folder. 3. The window in Figure 2 appears. 2 TRF3722 EVM User's Guide SLOU385 – May 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated GUI Installation www.ti.com Figure 2. GUI Installer Initialization 4. When the destination directory installation windows appear (Figure 3), click the Next >> buttons. Figure 3. Directory Installation Windows 5. Once the installation is complete, select Finish 6. Go to Start → All Programs → TRF3722_PG1p0_Project to launch the TRF3722 GUI. SLOU385 – May 2014 Submit Documentation Feedback TRF3722 EVM User's Guide Copyright © 2014, Texas Instruments Incorporated 3 GUI Installation 2.1 www.ti.com GUI Details The TRF3722 GUI has two tabs, a Top Level tab and an Advanced Settings tab. The Top Level tab has two ON/OFF buttons which turn the LO section and IQ modulator section ON or OFF individually. When only the IQ modulator is turned ON, make sure a LO signal is provided at the EXT_VCO_IN SMA connector. The TRF3722 has seven registers (registers 0–6). Register 0 is a read-back register. The yellow circle in Figure 4 illustrates the Device Communication Failure warning that appears when the GUI doesn’t talk to the device. Whenever this happens, make sure the FTDI FT245RL device drivers are installed on your computer, reconnect the USB cable, and press the USB Reset button. Figure 4. GUI Warning 3 EVM Jumper Configuration The default EVM jumper installation is listed in Figure 5. Table 1. Default Jumper Connections 4 Jumper Description Default Connection Notes JP2 Power save Pins 2-3 Typical Operating Mode (1-2, power save mode) JP4 Crystal supply Pins 1-2 On-board crystal (make sure R23 is populated and R25 is DNI) JP3 Ext/USB supply Pins 1-2 External supply JP8 5-V LDO (U6) load Pins 1-2 External supply JP6 5 V from LDO (U6) Pins 1-2 LDO supply JP8 3.3 V from LDO (U5) Pins 1-2 LDO supply TRF3722 EVM User's Guide SLOU385 – May 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated EVM Jumper Configuration www.ti.com 3.1 Board Power-up Power up the board using the following steps: 1. Make sure the jumpers are properly placed as shown in Table 1. 2. The board can be powered up either by using a single 6-V DC power supply (either using connecter jack J1 or test point TP7) or using 3.3- and 5-V DC supplies. To obtain optimum phase noise performance, TI recommends operating the board using clean 3.3- and 5-V linearDC supplies without engaging the LDOs. 3. Power up the board using a single 6-V DC supply by connecting a 6-V DC supply either at the J1 power connector jack or at the test point (TP7) as shown in Figure 5. 4. When the 6-V DC supply is applied, red LED D1 turns ON. 5. When the 6-V DC supply is connected, the voltage at TP3 should read 3.3 V and the voltage at TP4 should read 5 V. 6. Power the board using 3.3- and 5-V DC supplies by removing jumpers JP12 and JP6. Directly connect a 3.3-V DC supply at test point TP3 and a 5-V DC supply at test point TP4. 7. At initial power up (before the device is programmed), typical consumption from a 3.3-V DC supply is around 55 mA (±15 mA) and typical consumption from a 5-V DC supply is around 20 mA (±7 mA). Figure 5 shows the voltage supply inputs. Figure 5. Voltage Supply Inputs SLOU385 – May 2014 Submit Documentation Feedback TRF3722 EVM User's Guide Copyright © 2014, Texas Instruments Incorporated 5 EVM Jumper Configuration 3.2 www.ti.com Modulator Linearity Validation Validate modular linearity using the following steps: 1. Connect the J7 RFOUT SMA connector to a Spectrum analyzer. 2. Connect the baseband in-phase positive signal to SMA connector J6 and in-phase negative signal to SMA connector J5. Connect positive quadrature signal to SMA connector J4 and negative quadrature signal to SMA connector J3. 3. Connect a mini-USB cable from the computer to J8. This should turn ON the blue LED (D3). 4. Terminate any unused SMA connectors to 50-Ω load. 5. Connect 6-V power adaptor. This should turn ON the red LED (D1). 6. Launch the TRF3722 GUI. 7. As an example, this guide now considers an RF target frequency of 1986.56 MHz. 8. Set the GUI as shown in Figure 6 and Figure 7. Figure 6. GUI Settings (a) 6 TRF3722 EVM User's Guide SLOU385 – May 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated EVM Jumper Configuration www.ti.com Figure 7. GUI Settings (b) 9. After setting proper register settings, click the Send All button. When the device is programmed, the green LED (D2) should turn ON which indicates PLL is locked as shown in Figure 8. Figure 8. TRF3722 EVM 10. Current consumption from the 3.3-V DC supply should now change to 390 mA (±20 mA), and the 5-V DC supply should change to 27 mA (±7 mA). 11. This is the typical current consumption with the GUI settings shown in Figure 6 and Figure 7, adjusting various bias settings in register 5 and register 6 change this current. 12. Use a DAC or an arbitrary waveform generator to generate two-tone I/Q baseband input signals. For example, consider 4.5 MHz and 5.5 MHz. SLOU385 – May 2014 Submit Documentation Feedback TRF3722 EVM User's Guide Copyright © 2014, Texas Instruments Incorporated 7 EVM Jumper Configuration www.ti.com 13. A typical setup using Agilent’s E4438C ESG vector signal generator to provide I/Q signals is as follows: (a) Press Preset. (b) Press Mode → More (1 of 2) → Multitone (c) Press Initialize Table → Number of Tones → 12 → Enter. (d) Press Freq Spacing → 1 → MHz. (e) Press Done. (f) Highlight each of the first 10 rows and press Toggle State to turn OFF the first 10 frequencies and only keep the last two rows with the BB frequency 4.5 MHz and 5.5 MHz ON. (g) Press Multitone Off/On to ON to generate the multitone waveform. (h) Adjust the differential I or Q voltage level by pressing Mode → I/Q → I/Q Output Control → I/Q Output Atten → Enter 9 → Press dB. (i) Set the common mode voltage to 0.25 V by pressing Mode → I/Q → I/Q Output Control → Common Mode I/Q Offset → 250 → mV. Use a DC voltage meter to monitor the DC common voltage at the inputs of I and Q and fine-tune the common mode voltage setting until it measures 250 mV. 14. Measure the TRF3722 output OIP3. The OIP3 at LO 1986.56 MHz should be around 28.5 ±2 dBm, as shown in Figure 9. Figure 9. TRF3722 OIP3 8 TRF3722 EVM User's Guide SLOU385 – May 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated EXT_VCO Modulator Linearity Validation www.ti.com 4 EXT_VCO Modulator Linearity Validation To test the external VCO / LO, turn off the LO section and apply LO signal at the EXT_VCO SMA connector. As an example, consider a frequency of 1986.56 MHz: 1. Use the GUI settings as shown in Figure 10 and Figure 11. 2. Since LO_DIV_SEL is Div2, apply a 3973.12-MHz signal at the EXT_VCO_IN SMA connector. 3. Use a DAC or an arbitrary waveform generator to generate two tone I/Q baseband input signals. As an example, consider 4.5 MHz and 5.5 MHz. 4. A typical setup using Agilent’s E4438C ESG vector signal generator to provide I/Q signals is as follows: (a) Press Preset. (b) Press Mode → More (1of 2) → Multitone (c) Press Initialize Table → Number of Tones → 12 → Enter. (d) Press Freq Spacing → 1 → MHz. (e) Press Done. (f) Highlight each of the first 10 rows and press ‘Toggle State’ to turn OFF the first 10 frequencies and only keep the last two rows with the BB frequency 4.5 MHz and 5.5 MHz ON. (g) Press Multitone Off/On to ON to generate the multitone waveform. (h) Adjust the differential I or Q voltage level by pressing Mode → I/Q → I/Q Output Control → I/Q Output Atten → Enter 9 → Press dB. (i) Set the common mode voltage to 0.25 V by pressing Mode → I/Q → I/Q Output Control → Common Mode I/Q Offset → 250 → mV. Use a DC voltage meter to monitor the DC common voltage at the inputs of I and Q and fine-tune the common mode voltage setting until it measures 250 mV. SLOU385 – May 2014 Submit Documentation Feedback TRF3722 EVM User's Guide Copyright © 2014, Texas Instruments Incorporated 9 EXT_VCO Modulator Linearity Validation www.ti.com 5. Measure the TRF3722 output OIP3. The OIP3 at LO 1986.56 MHz should be around 28.5 dBm as shown in Figure 10 and Figure 11. Figure 10. TRF3722 GUI, Ext VCO Configuration (a) Figure 11. TRF3722 GUI, Ext VCO Configuration (b) 10 TRF3722 EVM User's Guide SLOU385 – May 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Phase Noise Validation - Integer Mode www.ti.com 5 Phase Noise Validation - Integer Mode Validate integer mode phase noise using the following steps: 1. The default loop filter populated on the TRF3722 EVM is an integer mode loop filter. 2. A 40-kHz bandwidth and 2.56-MHz Fpfd loop filter has been designed using the loop filter calculator tool, available from www.ti.com. 3. Figure 12 shows the screen shot of a loop filter. Figure 12. Integer Mode Loop Filter 4. As an example, consider an 1800-MHz target frequency. SLOU385 – May 2014 Submit Documentation Feedback TRF3722 EVM User's Guide Copyright © 2014, Texas Instruments Incorporated 11 Phase Noise Validation - Integer Mode www.ti.com 5. Set the GUI as shown in Figure 13 and Figure 14. Figure 13. Integer Mode Loop Filter (a) Figure 14. Integer Mode Loop Filter (b) 12 TRF3722 EVM User's Guide SLOU385 – May 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Phase Noise Validation - Integer Mode www.ti.com 6. The TRF3722 phase noise at 1800-MHz frequency at the LO_OUTP SMA connector is shown in Figure 15. Figure 15. Integer Mode Phase Noise at 1800 MHz 7. Obtain optimum phase noise performance by using linear clean power supplies at TP3 3.3-V DC supply and TP4 5-V DC supply. 8. Obtain best close-in noise (below 500-Hz offset) by using a low phase noise reference signal at the J11 EXT_REF_IN SMA connector. When operating the board using an external reference, make sure to DNI R23, remove JP4, and populate R25. SLOU385 – May 2014 Submit Documentation Feedback TRF3722 EVM User's Guide Copyright © 2014, Texas Instruments Incorporated 13 Phase Noise Validation - Integer Mode 5.1 www.ti.com Phase Noise Validation - Fractional Mode Validate fractional mode phase noise using the following steps: 1. The default loop filter connected on the TRF3722 EVM is an integer mode loop filter. Change integer loop filter to fractional loop filter DNI R11 and DNI R40, and populate R8 and R10. 2. A 40-kHz bandwidth and 15.36-MHz Fpfd loop filter has been designed using the loop filter calculator tool, available on www.ti.com. 3. Figure 16 shows the screen shot of a loop filter tool. Figure 16. Fractional Mode Loop Filter 4. As an example, use a 3532.9 MHz target frequency. 5. An external reference of 153.6 MHz is used. To use an external reference, make sure to DNI R23, remove JP4, and populate R25. 14 TRF3722 EVM User's Guide SLOU385 – May 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Phase Noise Validation - Integer Mode www.ti.com 6. Set the GUI as shown in Figure 17 and Figure 18. Figure 17. Fractional Mode Loop Filter (a) Figure 18. Fractional Mode Loop Filter (b) SLOU385 – May 2014 Submit Documentation Feedback TRF3722 EVM User's Guide Copyright © 2014, Texas Instruments Incorporated 15 Phase Noise Validation - Integer Mode www.ti.com 7. TRF3722 phase noise at 3532.9-MHz frequency at LO_OUTP is shown in Figure 19. Figure 19. Fractional Phase Noise at 3532.9 MHz 8. To obtain optimum phase noise performance use linear clean power supplies at TP3 3.3-V DC supply and TP4 5-V DC supply. 9. To obtain best close-in noise (below 500-Hz offset), use a low phase noise reference signal at J11 EXT_REF_IN SMA connector. 16 TRF3722 EVM User's Guide SLOU385 – May 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated ADDITIONAL TERMS AND CONDITIONS, WARNINGS, RESTRICTIONS, AND DISCLAIMERS FOR EVALUATION MODULES Texas Instruments Incorporated (TI) markets, sells, and loans all evaluation boards, kits, and/or modules (EVMs) pursuant to, and user expressly acknowledges, represents, and agrees, and takes sole responsibility and risk with respect to, the following: 1. User agrees and acknowledges that EVMs are intended to be handled and used for feasibility evaluation only in laboratory and/or development environments. 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