MAX148BEPP+

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Full model: MAX148BEPP+

Manufacturer: Analog Devices (formerly Maxim Integrated)

Device type: isolated RS-485/RS-422 transceiver

Package: DIP-20 (plastic dual in-line package with heat sink)

Operating voltage: 4.75V ~ 5.25V

Operating temperature: -40°C ~ +85°C (industrial grade)

Isolation voltage: 2500Vrms (for 1 minute)

Data transmission rate: 10Mbps (maximum)

Common mode voltage range: ±25V

ESD protection: ±15kV (human body model)

Quiescent current: 10mA (typical)

Propagation delay: 30ns (maximum)

Receiver sensitivity: ±200mV

Description

Data Acquisition - Analog-to-Digital Converters (ADCs) are essential for any system that needs to measure and process analog signals to achieve digital output. The device is used to convert analog signals into their corresponding digital signals. The MAX148BEPP+ is one of the most advanced devices in this field, providing accurate, high-speed, wide dynamic range analog-to-digital conversion, among other features. The main application area is medical imaging, where it is used to convert analog signals into digital images. It is commonly used in ultrasound and magnetic resonance imaging (MRI), ensuring the accuracy and high resolution of the images. It is suitable for industrial and consumer applications, such as industrial control systems, automotive applications, factory automation, consumer electronic gaming systems, and other consumer electronics. When an analog signal is applied to the device, it is converted into a digital code stream based on a specific clock frequency. The device samples the signal at fixed time intervals, and the analog-to-digital conversion generates a set of samples that are then used to construct the final digital signal. With a sampling rate of up to 400MHz, the device is capable of converting most analog signals over a wide frequency range from DC to approximately 300MHz. The device provides unidirectional conversion with 16-bit data resolution, ensuring high accuracy and precision. In addition, the device has a low noise floor and a wide dynamic range of up to 110 dB, which allows it to work properly even with low-level signals. It also features low power consumption, high-frequency response, and low harmonic distortion. The MAX148BEPP+ is a powerful and versatile ADC that enables accurate, high-resolution, and high-speed analog-to-digital conversion. Its application range includes medical imaging, industrial, and consumer electronics applications, making it an important component of many electronic systems. In addition, its low noise floor, wide dynamic range, and low power consumption make it an ideal choice for many applications.

Features

   1. Complete electrical isolation:

       - Integrated DC-DC isolated power supply and digital isolator, no external isolation components required

   2. High anti-interference ability:

       - Supports ±25V bus common mode voltage, adapting to industrial noise environment

   3. Fail-safe design:

       - The receiver outputs a logic high level by default when it is open/short-circuited

   4. Industrial reliability:

       - Complies with IEC 61000-4 electromagnetic compatibility standard

Application scenarios

   1. Industrial automation: PLC communication module

   2. Power monitoring: smart meter concentrator

   3. Medical equipment: isolated data acquisition

   4. Building control: BACnet bus node

Pin definition (DIP-20)

Typical application circuit

      Industrial bus node connection:

              MCU side:

                       5V ─── VCC1

                       GND ── GND1

                       TX ─── DI

                       RX ─── RO

                       CTRL ─ DE/RE

              Bus side:

                      A/B ─── 120Ω terminal resistor ─── RS-485 bus

                      VCC2 can power the isolated side sensor

Design considerations

   1. Isolation design:

       - The ground planes on the logic side and the bus side must be completely isolated

       - The recommended minimum creepage distance is 8mm (PCB layout)

   2. Terminal matching:

       - 120Ω terminal resistors are required at both ends of the bus

       - It is recommended to add bus bias resistors for long-distance transmission

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