MAX127/MAX128 12-Bit Data Acquisition System Technical Summary

MAX127/MAX128 12-Bit Data Acquisition System (DAS)

Overview

The MAX127 and MAX128 are high-performance, multirange, 12-bit data acquisition systems (DAS) designed for precision analog-to-digital conversion in a wide range of applications. These devices operate on a single +5V power supply, simplifying system design while maintaining high accuracy and performance. The MAX127/MAX128 integrate a 12-bit successive approximation analog-to-digital converter (ADC), a track/hold amplifier, and a versatile input multiplexer, making them ideal for industrial control, instrumentation, and data acquisition systems.

Key advantages of the MAX127/MAX128 include their ability to handle bipolar and unipolar input signals, a high-speed 5MHz bandwidth track/hold, and a throughput rate of up to 8ksps. The devices also offer the flexibility of using either an internal 4.096V reference or an external reference voltage, providing designers with options to optimize performance for specific applications.

Features

12-Bit Resolution: Provides high-accuracy conversion with excellent linearity.
Single +5V Supply Operation: Simplifies power supply design and reduces system complexity.
Multirange Input Capability: Supports both unipolar (0V to +5V, 0V to +10V) and bipolar (±5V, ±10V) input ranges.
High-Speed Track/Hold: 5MHz bandwidth ensures accurate signal acquisition for dynamic inputs.
Fast Conversion Rate: Up to 8ksps throughput enables real-time data acquisition.
Flexible Reference Options: Internal 4.096V reference or external reference voltage support.
Low Power Consumption: Optimized for power-sensitive applications.
8-Channel Multiplexer: Allows monitoring of multiple analog signals with a single device.
Serial Interface: Compatible with SPI/QSPI/MICROWIRE interfaces for easy microcontroller integration.
Compact Package Options: Available in space-saving packages for board-constrained designs.

Applications

The MAX127/MAX128 are suitable for a wide variety of applications requiring precision analog-to-digital conversion, including:

Industrial Control Systems: Process monitoring, PLCs, and automation equipment.
Data Acquisition Systems: Multi-channel data logging and measurement systems.
Medical Instrumentation: Patient monitoring and diagnostic equipment.
Test and Measurement Equipment: Oscilloscopes, signal analyzers, and benchtop instruments.
Automotive Electronics: Sensor interfaces and vehicle monitoring systems.
Communications Equipment: Base stations and network monitoring devices.
Consumer Electronics: High-end audio equipment and instrumentation.

Electrical Characteristics

Absolute Maximum Ratings

VDD to GND: -0.3V to +6V
Analog Input Voltage (Unipolar Mode): -0.3V to VDD + 0.3V
Analog Input Voltage (Bipolar Mode): ±16.5V
Reference Input Voltage: -0.3V to VDD + 0.3V
Digital Input Voltage: -0.3V to VDD + 0.3V
Operating Temperature Range: -40°C to +85°C
Storage Temperature Range: -65°C to +150°C

DC Electrical Characteristics

Resolution: 12 bits
Integral Nonlinearity (INL): ±1 LSB (max)
Differential Nonlinearity (DNL): ±1 LSB (max)
Signal-to-Noise Ratio (SNR): 72dB (typ)
Total Harmonic Distortion (THD): -80dB (typ)
Full Power Bandwidth: 5MHz (typ)
Input Leakage Current: ±1µA (max)

AC Electrical Characteristics

Conversion Time: 125µs (max)
Throughput Rate: 8ksps (max)
Track/Hold Acquisition Time: 1.5µs (max)
Aperture Delay: 50ns (typ)
Aperture Jitter: 50ps (typ)

Power Requirements

Supply Voltage (VDD): +4.75V to +5.25V
Supply Current (Operating): 2.5mA (typ)
Supply Current (Power-Down Mode): 1µA (max)
Power Dissipation: 12.5mW (typ)

Package Information

The MAX127/MAX128 are available in several package options to accommodate different design requirements:

20-Pin PDIP (Plastic Dual In-Line Package): 0.3" wide, suitable for through-hole mounting.
20-Pin SOIC (Small Outline Integrated Circuit): 0.295" body width, ideal for space-constrained applications.
20-Pin SSOP (Shrink Small Outline Package): 0.209" body width, offers higher density than SOIC.
20-Pin TSSOP (Thin Shrink Small Outline Package): 0.173" body width, maximum space savings.

Package Dimensions

PDIP: 1.015" (25.78mm) length × 0.3" (7.62mm) width × 0.21" (5.33mm) height
SOIC: 0.496" (12.6mm) length × 0.295" (7.5mm) width × 0.093" (2.35mm) height
SSOP: 0.291" (7.4mm) length × 0.209" (5.3mm) width × 0.093" (2.35mm) height
TSSOP: 0.256" (6.5mm) length × 0.173" (4.4mm) width × 0.047" (1.2mm) height