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ADL5375 Datasheet(PDF) 7 Page - Analog Devices |
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ADL5375 Datasheet(HTML) 7 Page - Analog Devices |
7 / 9 page Circuit Note CN-0205 Rev. 0 | Page 7 of 9 IOUT1 IOUT1 20mA TO 0mA AD9122 0mA TO 20mA 50Ω SPECTRUM ANALYZER DPG DATA PATTERN GENERATOR SIGNAL GENERATOR FOR FDAC FDAC FDATA ADL5375-05 IOUT2 IOUT2 SIGNAL GENERATOR FOR LO LO 100Ω 100Ω BB FILTER AD9122-M5375-EBZ POWER SUPPLY 5V J9 J1 J6 PC DPG DOWNLOADER SOFTWARE AD9122 SOFTWARE USB USB 50Ω 50Ω 50Ω BB FILTER 20mA TO 0mA 0mA TO 20mA Figure 16. Test Setup Functional Block Diagram Further insight to proper layout can be found by examining the AD9122-M5375-EBZ layout files in the design support package www.analog.com/CN0205-DesignSupport. COMMON VARIATIONS The interface described in this circuit note can be used between any TxDAC digital-to-analog converter (AD9779A, AD9788, AD9125, AD9148) that is set for 20 mA full-scale current and the ADL5370, ADL5371/ADL5372, ADL5373, ADL5374, ADL5385, ADL5386, etc., family of I/Q modulators that require 0.5 V baseband dc bias levels. The interface can also be adapted to the AD8345/AD8349 low current modulators, with some adjustment to the bias level by properly selecting the DAC termination resistors. CIRCUIT EVALUATION AND TEST The following section describes details of performing the common-mode test (results shown in Figure 10). The test setup is flexible and allows other measurements shown in this circuit note to be performed. Equipment Needed (Equivalents Can be Substituted) • DPG : ADI Digital Pattern Generator • Signal Generator for clock: Agilent E4437B • Signal generator for LO: Agilent 8665B • Spectrum analyzer: Agilent E4440A • Power supply: Agilent E3631A Setup and Test 1. Connect the setup and measurement system shown in Figure 16. 2. Set the power supply to +5 V. 3. Set the signal generator for FDAC to 368.64 MHz @ 5 dBm, and the signal generator for LO to 2140 MHz @ 0 dBm. 4. Turn on the power supply and signal generators. Set the spectrum analyzer at 2 × FDAC MHz, 1 MHz span. 5. Set up the AD9122 through USB at AD9122/AD9125 SPI control software as shown in Figure 17 and run. Refer to the AD9122 Evaluation Board Quick Start Guide in www.analog.com-CN0205-DesignSupport. • Interpolation ("1" in Figure 17) : 1× • Fine modulation ("2" in Figure 17) : ON • Data rate ("3" in Figure 17) : same as FDAC frequency • NCO frequency ("4" in Figure 17) : 173.32 MHz 6. Set up DPG (refer to AD9122 Evaluation Board Quick Start Guide) • Make sure DCO frequency ("1" in Figure 18) is close to FDAC frequency. • Set sample rate ("2" in Figure 18) same as FDAC frequency and 1 MHz at desired frequency. |
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Similar Description - ADL5375 |
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