Overview
The ADG408BR is a high-performance 8-channel analog multiplexer from Analog Devices, designed for precision signal routing in demanding environments. As a monolithic CMOS device, it integrates eight independently addressable switches with low on-resistance (typically 100Ω) and minimal signal distortion. Engineered for industrial automation, test equipment, and data acquisition systems, the ADG408BR offers a -40°C to +85°C operating range and ±15V supply voltage capability. Its break-before-make switching action prevents channel cross-talk, making it suitable for sensitive measurement applications.
Structure and Working Principle
The ADG408BR employs a series of CMOS transmission gates controlled by a 3-to-8 binary decoder. Each channel consists of complementary N-channel and P-channel MOSFETs arranged in parallel to achieve low on-resistance across the full input signal range. When a channel is selected via address pins (A0-A2), the corresponding switch closes within 250ns (typical), creating a bidirectional signal path between the common terminal and the selected input. The device incorporates charge pump circuitry to ensure proper gate drive voltages even with low supply voltages.
Key Features
The ADG408BR distinguishes itself with 0.5nA leakage current (max) at +25°C and 35pC charge injection, minimizing signal distortion in high-impedance circuits. Its 100Ω on-resistance remains flat (±5Ω) across the analog signal range due to the complementary MOSFET design. Additional features include 1μA standby current for power-sensitive applications and latch-up immunity under all operating conditions. The device meets industrial EMC standards and offers -78dB crosstalk rejection at 1MHz, ensuring signal integrity in multi-channel systems.
Application Areas
Primary applications include automated test equipment (ATE) signal routing, medical instrumentation multiplexing, and industrial process control systems. The ADG408BR is particularly valued in data acquisition cards where multiple sensors require sequential sampling by a single ADC. Telecommunication systems use these multiplexers for channel switching in base station equipment. The device's wide voltage range makes it suitable for battery monitoring systems in electric vehicles, where it routes cell voltage measurements to monitoring ICs.
Maintenance and Precautions
The ADG408BR requires minimal maintenance but benefits from periodic signal path verification in critical systems. Always power down the device before making connections to prevent latch-up. Use current-limiting resistors (1kΩ suggested) when switching signals from external sources with unknown characteristics. ESD precautions are critical - handle with grounded wrist straps and store in conductive foam. Avoid exposing the device to voltages beyond its absolute maximum ratings (-17V to +17V analog signals, -0.3V to VDD+0.3V digital inputs) to prevent permanent damage.
B2B Procurement Guide
When sourcing ADG408BR multiplexers, verify the manufacturer's part number suffix (BR indicates industrial temperature range). Authorized distributors typically offer volume pricing tiers starting at 100-unit quantities, with lead times ranging from 4-8 weeks for non-stock items. Consider alternative packaging options (SOIC-16 vs. TSSOP-16) based on PCB space constraints. For mission-critical applications, request factory test reports showing key parameters like on-resistance and leakage current. Some suppliers offer value-added services like programmed samples or tape-and-reel packaging for automated assembly.
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