## Overview of the AD8194ACPZ-R7 The **AD8194ACPZ-R7** is a high-performance, low-power **TMDS (Transition Minimized Differential Signaling) switch** designed primarily for HDMI/DVI applications. Manufactured by Analog Devices, it is a 2:1 multiplexer that allows for switching between two different HDMI/DVI sources to a single sink (display). --- ### Technical Specifications The following table summarizes the key electronic characteristics of the AD8194ACPZ-R7: | Parameter | Specification | | :--- | :--- | | **Function** | 2:1 HDMI/DVI Switch | | **Data Rate** | Up to 2.25 Gbps per channel | | **Max Resolution** | 1080p @ 60Hz / UXGA (1600x1200) | | **Supply Voltage (Vcc)** | 3.3V | | **Power Consumption** | ~320 mW (typical) | | **Package Type** | LFCSP-32 (Lead Frame Chip Scale Package) | | **Operating Temperature** | -40°C to +85°C | | **ESD Protection** | 8 kV (HBM) on TMDS inputs | --- ### Key Electronic Features 1. **TMDS Switching:** The core functionality is switching high-speed differential signals. It supports four channels (3 Data + 1 Clock) per port. 2. **Equalization (EQ):** It includes programmable receive equalization. This feature compensates for signal degradation caused by long HDMI cables, ensuring a clean digital signal reaches the processor. 3. **Pre-emphasis:** The device offers selectable output pre-emphasis, which helps maintain signal integrity when driving long traces on a PCB or additional cables. 4. **DDC and HPD Support:** It integrates switching for auxiliary signals, including the **Display Data Channel (DDC)** and **Hot Plug Detect (HPD)**, making it a complete HDMI switching solution. 5. **I2C Control:** The device is configured and controlled via an I2C interface, allowing the system microcontroller to manage switching logic and EQ settings. --- ### Pin Configuration Categories (LFCSP-32) | Pin Category | Description | | :--- | :--- | | **TMDS Inputs** | High-speed differential pairs for Source A and Source B. | | **TMDS Outputs** | Single differential output set to the sink. | | **Control Pins** | SCL/SDA (I2C), Reset, and Address pins. | | **Auxiliary** | DDC lines (SDA_S, SCL_S) and HPD status lines. | | **Power/GND** | 3.3V Vcc and Ground pad for thermal dissipation. | --- ### Common Applications * **HDTVs and Monitors:** Allowing multiple HDMI inputs for a single screen. * **AV Receivers:** Switching between gaming consoles, Blu-ray players, and set-top boxes. * **Projectors:** Providing versatile input options. * **HDMI Switchers/Splitters:** Professional video distribution equipment.