The **ADL5387ACPZ-R2** is a high-performance, broadband quadrature I/Q demodulator designed for use in next-generation wireless infrastructure and communications equipment. It covers a wide frequency range from 30 MHz to 2 GHz. --- ### ## Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **RF Input Frequency Range** | 30 MHz to 2000 MHz | | **I/Q Baseband Bandwidth** | DC to 240 MHz | | **Quadrature Phase Error** | 0.25° at 450 MHz | | **Amplitude Balance** | 0.05 dB at 450 MHz | | **Input IP3 (IIP3)** | 31 dBm at 900 MHz | | **Noise Figure (NF)** | 13.2 dB at 900 MHz | | **Supply Voltage** | 4.75 V to 5.25 V | | **Package Type** | 24-lead LFCSP (Lead Frame Chip Scale Package) | --- ### ### Core Functional Components 1. **Broadband Mixer Core:** The device features two high-linearity mixers that down-convert the RF signal directly to baseband (I and Q components). Its wideband nature allows it to be used in various standards (LTE, W-CDMA, GSM) without changing hardware. 2. **Local Oscillator (LO) Interface:** The LO interface can be driven differentially or single-ended. It includes a 2×LO or 1×LO divider architecture (selectable) to provide the necessary 90° phase shift for quadrature demodulation. 3. **Quadrature Phase Splitter:** This internal circuitry ensures that the local oscillator signals driving the I and Q mixers are exactly 90 degrees out of phase. The ADL5387 is known for its excellent phase and amplitude balance, which is critical for minimizing Bit Error Rates (BER). 4. **Baseband Buffers:** The outputs (I+, I-, Q+, Q-) are differential and include buffers that provide high output swing and low distortion, suitable for driving high-speed Analog-to-Digital Converters (ADCs). --- ### ### Typical Application Circuit The ADL5387 is typically integrated into a signal chain as follows: ```mermaid graph LR A[RF Antenna] --> B[LNA] B --> C[ADL5387 Demodulator] D[LO Synth] --> C C --> E[Baseband Filter] E --> F[Dual ADC] ``` --- ### ### Advantages and Use Cases * **Direct Conversion Architecture:** Eliminates the need for multiple Intermediate Frequency (IF) stages, reducing BOM (Bill of Materials) cost and PCB size. * **High Dynamic Range:** The high IIP3 and low noise figure make it ideal for environments with high interference. * **Applications:** * Point-to-point microwave radio links. * Wireless local loop. * Digital pre-distortion (DPD) observation paths. * Military communications.