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ADP3334 bảng dữ liệu(PDF) 3 Page - Analog Devices |
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ADP3334 bảng dữ liệu(HTML) 3 Page - Analog Devices |
3 / 8 page Evaluation Board User Guide UG-521 Rev. 0 | Page 3 of 8 EVALUATION BOARD HARDWARE POWER SUPPLIES The user must apply 5.5 V to the VSUPPLY power connectors (4 mm banana connectors). An LED, D6, indicates when USB power is available, and another LED, D5, indicates when the main board is powered. Switch SW-EXT is used to switch in the 5.5 V supply. IQ INPUTS The ADL5375 has four differential IQ inputs. These are accessi- ble from the SMA connectors and should be connected to an appropriate analog baseband IQ source such as the Rhode & Schwarz AMIQ. Set the dc bias voltage for the IQ inputs at 0.5 V. RF/LO OUTPUTS The ADL5375 RF output is ac-coupled out to the RFOUT SMA. There are also two LO output SMA connectors that can be used to view the filtered ADF4351 RF outputs on a spectrum analyzer. When connecting to an analyzer, terminate the unused LO output with a 50 Ω termination. When measuring EVM or adjacent channel leakage current (ACLR), disconnect these LO outputs by removing Capacitors C72 and C73 to prevent loading the circuit. LOOP FILTER AND CHARGE PUMP CURRENT The loop filter schematic is included in the evaluation board and can be found at www.analog.com/CN0285-DesignSupport. The default loop filter is set to 70 kHz. Using a charge pump setting of 2.5 mA is recommended. Figure 2. Loop Filter Layout REFERENCE SOURCE The 25 MHz TCXO from Rakon provides the necessary reference signal. An external REFIN can be used if desired. In this case, disable the on-board TCXO by removing R59. R9 can be populated with 50 Ω to match the impedance of the evaluation board to the external reference source. |
Số phần tương tự - ADP3334 |
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Mô tả tương tự - ADP3334 |
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