The **ADAV** series (most notably the **ADAV801** and **ADAV803**) consists of high-performance Audio Processors produced by Analog Devices. These chips are specifically designed for recordable media applications, such as DVD recorders, HDD recorders, and high-end consumer audio systems. --- ## 1. Core Architecture The ADAV series functions as an "Audio Codec with Integrated Processing." It combines several high-quality analog and digital components into a single package to handle the entire audio signal path. | Component | Function | | :--- | :--- | | **ADC** | 24-bit Analog-to-Digital Converter for high-fidelity recording. | | **DAC** | 24-bit Digital-to-Analog Converter for playback. | | **SRC** | Asynchronous Sample Rate Converter (High-quality resampling). | | **PLL** | On-chip Phase-Locked Loop for ultra-low jitter clock generation. | --- ## 2. Key Technical Specifications While specific models vary slightly, the general specifications for the ADAV family are as follows: ### Audio Performance * **Resolution:** 24-bit. * **Dynamic Range:** Typically >100 dB. * **THD + N:** Better than -90 dB. * **Sample Rates:** Supports standard rates from 32 kHz to 96 kHz (and up to 192 kHz on specific outputs). ### Processing Capabilities * **Flexible Routing:** Allows internal routing between digital inputs (S/PDIF), analog inputs, and various outputs. * **Record Path:** Specialized circuits to ensure audio is synced correctly with video streams. * **Mixing:** Ability to mix multiple digital and analog sources. --- ## 3. Pinout and Connectivity Categories The electronic pins of an ADAV chip are generally grouped into four functional categories: 1. **Analog I/O:** Pins for differential or single-ended audio input and output. 2. **Digital Audio Interface:** I2S, Left Justified, or Right Justified data pins for communicating with an SoC or DSP. 3. **Control Port:** I2C or SPI interface used by a microcontroller to configure the internal registers. 4. **Clocking:** Pins for external crystals (XIN/XOUT) or Master Clock (MCLK) inputs. --- ## 4. Typical Application Circuit When designing a PCB for an ADAV component, the following layout considerations are critical: ```c // Example: Pseudo-code for initializing an ADAV via I2C void init_adav() { write_reg(ADAV_PLL_CTRL, 0x01); // Enable PLL write_reg(ADAV_DAC_CTRL, 0x00); // Unmute DACs write_reg(ADAV_SRC_CTRL, 0x44); // Set Sample Rate Converter to 48kHz } ``` * **Decoupling:** Requires low-ESR capacitors (0.1µF) very close to the DVDD and AVDD pins. * **Grounding:** Separation of Analog Ground (AGND) and Digital Ground (DGND) is necessary to prevent digital noise from bleeding into the audio signal. --- ## 5. Summary Table: ADAV801 vs. ADAV803 | Feature | ADAV801 | ADAV803 | | :--- | :--- | :--- | | **Control Interface** | SPI | I2C | | **Primary Use** | DVD/HDD Recorders | Consumer Audio / AVRs | | **Package** | 64-lead LQFP | 64-lead LQFP | ---