LMV228TLEVAL

User's Guide SNWA007A – March 2008 – Revised April 2013 AN-1804 LMV225/LMV228 DSBGA Evaluation Board 1 General Description This board can be used to evaluate the Texas Instruments LMV225 and LMV228 RF detectors. These logarithmic power detectors are intended for use in CDMA and WCDMA applications. They have a 30 dB dynamic range and an RF frequency range from 450 MHz to 2 GHz. The LMV228 is designed to be used in combination with a directional coupler, while the LMV225 detector is especially suited for power measurements via a high-resistive tap as well as directional coupler. The LMV225 and LMV228 have an integrated filter for low-ripple average power detection of CDMA signals. Additional filtering can be applied using a single external capacitor. 2 Basic Operation The LMV225 and LMV228 provide an accurate temperature and supply compensated DC output voltage that relates linearly to the applied RF input power in dBm. The single supply, ranging from 2.7V to 5.5V, can be applied through connectors P4 and P5. The signal applied to connector P2 puts the detector in an active or a shutdown mode. The detector is active for Enable = HI, otherwise it is in a low power consumption shutdown mode. The RF signal is applied through connector P1, while the output voltage is measured through connector P3. 2.1 Input The LMV225 has an RF power detection range from −30 dBm to 0 dBm and is designed for direct use in combination with resistive taps. The LMV228 has a detection range from −15 dBm to 15 dBm and are intended for use in combination with a directional coupler. All three detectors have an input impedance of 50Ω. Details about the configuration can be found in the devices' data sheet. 2.2 Output The output voltage range is typically 0.2V to 2V and can be scaled down to meet ADC input range requirements (both LMV225 and LMV228). Since the LMV225 and LMV228 have a current controlled output, the voltage range can be adjusted by changing the output resistance. To change this a resistor needs to be placed in R5. The output impedance of the detector (typical 19.8 kΩ) together with the resistor R5 translates the current into a voltage. The value of resistor R5 determines the exact scaling. A value of 19.8 kΩ, for example, divides the output voltage range by half. Besides scaling the output voltage, the output ripple can be reduced by lowpass filtering. This can be realized with capacitor C3. Further details can be found in the applications information section in the devices' data sheet.. All trademarks are the property of their respective owners. SNWA007A – March 2008 – Revised April 2013 Submit Documentation Feedback AN-1804 LMV225/LMV228 DSBGA Evaluation Board Copyright © 2008–2013, Texas Instruments Incorporated 1 Schematic 3 www.ti.com Schematic The schematic of the evaluation board is shown in Figure 1. VDD U1 A2 R2 0: P1 C2 100 pF RFIN/EN A1 RFIN LMV225/ B2 LMV228 R3 N/C P3 OUT OUT R5 N/C B1 C3 N/C R4 10 k: GND P2 P4 ENABLE R1 N/C U1 ± pin A2 VDD C1 N/C P5 + C4 100 µF C5 10 nF GND U1 ± pin B1 Figure 1. Schematic of the Evaluation Board 4 Bill of Materials The Bill of Material (BOM) of the evaluation board is listed in Table 1. Table 1. Bill of Materials of the Evaluation Board 2 Designator Description Comment C2 0603 Capacitor 100 pF C4 Case_C Capacitor 100 µF C5 0603 Capacitor 10 nF C1, C3 0603 Capacitor Not Connected P1 Connector SMA P2 Connector BNC P3 Connector BNC P4 Connector Banana P5 Connector Banana R2 0603 Resistor 0Ω R4 0603 Resistor 10 kΩ R1, R3, R5 0603 Resistor Not Connected U1 DSBGA LMV225 or LMV228 AN-1804 LMV225/LMV228 DSBGA Evaluation Board SNWA007A – March 2008 – Revised April 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Layout www.ti.com 5 Layout The layout of the evaluation board is shown in Figure 2. All Layers SNWA007A – March 2008 – Revised April 2013 Submit Documentation Feedback AN-1804 LMV225/LMV228 DSBGA Evaluation Board Copyright © 2008–2013, Texas Instruments Incorporated 3 Layout www.ti.com Silk Screen Figure 2. Layout of the Evaluation Board 4 AN-1804 LMV225/LMV228 DSBGA Evaluation Board SNWA007A – March 2008 – Revised April 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Measurement Procedure www.ti.com 6 Measurement Procedure The performance of the LMV225 or LMV228 can be measured with the setup given in Figure 3. In this measurement example a supply voltage of 2.7V is applied by the power supply. To put the LMV225 or LMV228 in active mode, the Enable (P2) is connected to 2.7V as well. The resulting DC output voltage is measured with a multimeter connected to P3. A 900 MHz RF signal is applied by the RF generator to connector P1, where the RF power is swept from −50 dBm to +20 dBm. VDD Power Supply VDD ENABLE P2 RFIN RF Signal Generator P4 Evaluation Board LMV225/LMV228 P1 P3 OUT Digital Volt Meter P5 GND Figure 3. Measurement Setup SNWA007A – March 2008 – Revised April 2013 Submit Documentation Feedback AN-1804 LMV225/LMV228 DSBGA Evaluation Board Copyright © 2008–2013, Texas Instruments Incorporated 5 Measurement Results 7 www.ti.com Measurement Results Figure 4, and Figure 5 show the measurement results for the LMV225 and LMV228, respectively. For each plot the RF power is swept at 900 MHz for different temperatures. Also the error in dBs with respect to an ideal straight line is plotted (Log conformance). 5 2.50 4 2.25 85°C 25°C 2.00 25°C VOUT (V) 1.75 -40°C 1.50 2.00 2 1.75 1 1.25 1.00 3 0 -40°C -1 VOUT (V) 85°C ERROR (dB) 2.25 5 85°C 2 -40°C 85°C 1.50 3 1 25°C 1.25 0 -40°C 1.00 -1 -2 0.75 -2 0.75 0.50 -3 0.50 -3 0.25 -4 0.25 -4 -5 0.00 -50 0.00 -50 -40 -30 -20 -10 0 10 20 -5 -40 Figure 4. LMV225 Output Voltage and Log Conformance vs. RF Input Power at 900 MHz AN-1804 LMV225/LMV228 DSBGA Evaluation Board -30 -20 -10 0 10 20 RF INPUT POWER (dBm) RF INPUT POWER (dBm) 6 4 25°C ERROR (dB) 2.50 Figure 5. LMV228 Output Voltage and Log Conformance vs. RF Input Power at 900 MHz SNWA007A – March 2008 – Revised April 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. 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