The **ADE-R901LH** is a high-performance, surface-mount frequency mixer manufactured by Mini-Circuits. It is designed for frequency up-conversion and down-conversion in various communication systems. --- ### ## Technical Specifications The ADE-R901LH belongs to the ADE series of passive mixers, utilizing a double-balanced Schottky diode architecture. | Parameter | Specification | | :--- | :--- | | **RF/LO Frequency Range** | 300 to 900 MHz | | **IF Frequency Range** | DC to 250 MHz | | **LO Power Level** | +10 dBm (Level 10) | | **Conversion Loss** | 6.5 dB (Typical) | | **Isolation (LO-RF)** | 35 dB (Typical) | | **Isolation (LO-IF)** | 32 dB (Typical) | | **IP3 (Input)** | 15 dBm | | **Package Type** | CD542 (Surface Mount) | --- ### ## Key Electronic Components & Internal Design #### 1. Double-Balanced Diode Quad The "core" of the ADE-R901LH is a ring of four matched Schottky diodes. * **Function:** They act as switches triggered by the Local Oscillator (LO) signal. * **Advantage:** The double-balanced configuration provides inherent suppression of the LO and RF signals at the output port, resulting in high isolation. #### 2. Transmission Line Transformers (Baluns) The device contains internal micro-transformers on the input (RF) and Local Oscillator (LO) ports. * **Balanced-to-Unbalanced:** These convert single-ended signals into differential signals required to drive the diode quad. * **Impedance Matching:** They ensure the device maintains a 50-ohm characteristic impedance across the 300-900 MHz range. #### 3. Lead-Free Construction (LH Suffix) The **"LH"** suffix indicates that the part is: * **RoHS Compliant:** Manufactured without lead (Pb) to meet environmental standards. * **High Temperature Tolerant:** Designed to withstand standard lead-free solder reflow profiles. --- ### ## Port Configuration The device uses a standard 6-pin layout common to the CD542 package: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | **LO** | Local Oscillator Input | | **4** | **RF** | Radio Frequency Input | | **3** | **IF** | Intermediate Frequency Output | | **2, 5, 6** | **GND** | Ground connections for shielding | --- ### ## Common Applications * **UHF Receivers:** Used in cellular base stations or private radio networks. * **Frequency Converters:** Shifting signals between 900 MHz bands and lower IF frequencies for processing. * **ISM Band Devices:** Applications operating in the 433 MHz or 868/915 MHz Industrial, Scientific, and Medical bands.