The **ADG528A** is a high-performance CMOS monolithic analog multiplexer with 8 channels. It is specifically designed for high-speed, low-power applications where reliability and latch-up immunity are critical. --- ## 1. Technical Specifications The following table highlights the primary electronic characteristics of the ADG528A: | Parameter | Specification | | :--- | :--- | | **Channels** | 8-Channel Single-Ended | | **Logic Type** | TTL and CMOS Compatible | | **Power Supply** | Dual ($\pm$10.8V to $\pm$16.5V) or Single (10.8V to 16.5V) | | **On-Resistance ($R_{ON}$)** | 250 $\Omega$ (Typical) | | **Switching Speed ($t_{ON}$)** | 200 ns (Typical) | | **Latch-up Immunity** | High (Enhanced CMOS process) | | **Package Options** | DIP, SOIC, PLCC, LCCC | --- ## 2. Key Electronic Features ### A. Digital Control Interface The ADG528A includes on-chip binary address decoding. This means only three binary lines ($A_0, A_1, A_2$) are required to select one of the eight channels. It also features an **Enable (EN)** input to turn all switches off, which is useful for "daisy-chaining" multiple multiplexers. ### B. Latch-Up Proof Construction The "A" series (ADG528A) is manufactured using an enhanced process that provides inherent latch-up immunity. Latch-up is a common failure mode in CMOS circuits where a parasitic SCR (Silicon Controlled Rectifier) is triggered, leading to excessive current flow. ### C. Low Power Consumption Designed for efficiency, the chip consumes very little power (typically in the microwatt range), making it ideal for battery-operated instruments or high-density circuit boards where heat dissipation is a concern. --- ## 3. Pin Configuration Overview The device typically follows a standard layout to ensure signal integrity: 1. **Supply Pins ($V_{DD}, V_{SS}$):** Positive and negative rails. 2. **Analog Inputs ($S_1 - S_8$):** The 8 signal sources to be switched. 3. **Analog Output ($D$):** The common drain/output pin. 4. **Address Lines ($A_0 - A_2$):** Digital logic to select the active channel. 5. **GND:** Digital ground reference. --- ## 4. Typical Applications * **Data Acquisition Systems:** Switching multiple sensor inputs into a single Analog-to-Digital Converter (ADC). * **Communication Systems:** Signal routing and switching. * **Automated Test Equipment (ATE):** Precision signal selection during testing cycles. * **Avionics:** Used in environments requiring high reliability (TCHIPS variants often refer to high-temperature or military-grade testing).