MAX118 - 8-Bit, 8-Channel Analog-to-Digital Converter (ADC)

Overview

The MAX114/MAX118 are high-performance, microprocessor-compatible, 8-bit analog-to-digital converters (ADCs) designed for applications requiring fast and accurate data conversion. The MAX118 variant features an 8-channel input multiplexer, making it suitable for systems requiring multi-channel data acquisition. These devices operate from a single +5V power supply and utilize a half-flash conversion technique to achieve high-speed performance with conversion times as fast as 660ns. The MAX118 is ideal for embedded systems, industrial control, and instrumentation applications where reliable analog signal digitization is critical.

Key Features

• Single +5V Supply Operation: Simplifies power supply design by eliminating the need for dual-voltage rails.
• 8-Bit Resolution: Provides sufficient accuracy for a wide range of measurement and control applications.
• 8-Channel Multiplexer: Allows for the digitization of up to eight analog input signals, reducing the need for external multiplexing circuitry.
• Half-Flash Conversion Technique: Enables fast conversion times of 660ns, making the device suitable for high-speed applications.
• Microprocessor-Compatible Interface: Simplifies integration with microcontrollers and digital systems, featuring easy-to-use control signals.
• Low Power Consumption: Optimized for energy-efficient operation, making it suitable for portable and battery-powered devices.
• On-Chip Sample-and-Hold: Eliminates the need for an external sample-and-hold circuit, reducing component count and board space.
• Wide Input Voltage Range: Accommodates a broad range of analog input signals, enhancing versatility.

Applications

The MAX118 is designed for a variety of applications that require high-speed, multi-channel analog-to-digital conversion. Common use cases include:

• Data Acquisition Systems: Multi-channel sensor interfacing for industrial and scientific measurements.
• Industrial Control: Process monitoring and control in automation systems.
• Medical Instrumentation: Signal digitization in diagnostic and monitoring equipment.
• Automotive Systems: Engine control, sensor readouts, and dashboard instrumentation.
• Communications Equipment: Baseband signal processing and modulation/demodulation circuits.
• Consumer Electronics: Audio processing, touch panel interfaces, and other analog signal digitization tasks.

Electrical Characteristics

The following table summarizes the key electrical specifications of the MAX118 under typical operating conditions (+5V supply, T_A = +25°C).

Absolute Maximum Ratings

• Supply Voltage (V_DD): +6V
• Analog Input Voltage Range: -0.3V to V_DD + 0.3V
• Digital Input Voltage Range: -0.3V to V_DD + 0.3V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

DC Electrical Characteristics

• Resolution: 8 bits
• Integral Nonlinearity (INL): ±0.5 LSB (max)
• Differential Nonlinearity (DNL): ±0.5 LSB (max)
• Full-Scale Error: ±1 LSB (max)
• Zero-Scale Error: ±1 LSB (max)
• Power Supply Rejection Ratio (PSRR): 60dB (typ)
• Input Leakage Current: ±1µA (max)

AC Electrical Characteristics

• Conversion Time: 660ns (max)
• Throughput Rate: 1.5MSPS (max)
• Aperture Delay: 20ns (typ)
• Signal-to-Noise Ratio (SNR): 48dB (typ)
• Total Harmonic Distortion (THD): -55dB (typ)

Power Requirements

• Supply Voltage (V_DD): +4.75V to +5.25V
• Supply Current (Operating): 5mA (typ)
• Supply Current (Standby): 1µA (typ)

Package Information

The MAX118 is available in a compact, industry-standard package for easy integration into various PCB designs. The following package options are available:

20-Pin Plastic Dual In-Line Package (PDIP)

• Package Dimensions: 26.16mm x 6.35mm (body)
• Pin Pitch: 2.54mm
• Lead Material: Copper Alloy
• Operating Temperature: -40°C to +85°C

20-Pin Shrink Small Outline Package (SSOP)

• Package Dimensions: 7.2mm x 5.3mm (body)
• Pin Pitch: 0.65mm
• Lead Material: Copper Alloy
• Operating Temperature: -40°C to +85°C

Conclusion

The MAX118 is a versatile, high-performance 8-bit ADC with an integrated 8-channel multiplexer, making it an excellent choice for applications requiring multi-channel analog signal digitization. Its single +5V supply operation, fast conversion speed, and microprocessor-compatible interface simplify system design while delivering reliable performance. Whether used in industrial control, medical instrumentation, or consumer electronics, the MAX118 provides a robust solution for high-speed data acquisition needs.