Overview
The MAX1402EAI+ is a low-power, multichannel, serial-output analog-to-digital converter (ADC) produced by Analog Devices Inc./Maxim Integrated. This device features an 18-bit resolution and achieves 16-bit accuracy with no missing codes up to 480 samples per second (sps). It utilizes a sigma-delta modulator with a digital decimation filter, allowing for adjustable conversion resolution and output data rate. The MAX1402EAI+ operates from a +5V supply and is designed for low power consumption, with a quiescent current of 250µA in operating mode and 2µA in power-down mode.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 18 bits |
| Accuracy | 16 bits with no missing codes up to 480 sps |
| Supply Voltage | +5V (analog), +3V or +5V (digital) |
| Input Channels | 3 fully differential or 5 pseudo-differential |
| Gain Range | +1V/V to +128V/V |
| Current Sources | Matched 200µA for sensor excitation |
| Operating Temperature | -40°C to +85°C |
| Package | 28-pin SSOP |
| Quiescent Current | 250µA (operating), 2µA (power-down) |
Key Features
- 18-bit resolution, sigma-delta ADC with 16-bit accuracy up to 480 sps
- Low quiescent current: 250µA in operating mode, 2µA in power-down mode
- Matched on-board current sources (200µA) for sensor excitation
- Three fully differential or five pseudo-differential signal input channels
- Two additional fully differential system-calibration channels for gain and offset error correction
- Programmable gain and offset compensation
- Automatic channel scanning and continuous data output mode
- 3-wire serial interface (SPI/QSPI compatible)
- Excellent line rejection without further post-filtering
Applications
- Portable industrial instruments
- Portable weigh scales
- Loop-powered systems
- Pressure transducers
- Signal processing and industrial applications
Q & A
- What is the resolution and accuracy of the MAX1402EAI+ ADC?
The MAX1402EAI+ has an 18-bit resolution and achieves 16-bit accuracy with no missing codes up to 480 sps.
- What is the supply voltage range for the MAX1402EAI+?
The device operates from a +5V analog supply and can use either +3V or +5V for the digital supply.
- How many input channels does the MAX1402EAI+ have?
The MAX1402EAI+ has three fully differential input channels that can also be configured as five pseudo-differential channels.
- What is the gain range of the input channels?
The gain range of the input channels is from +1V/V to +128V/V.
- Does the MAX1402EAI+ have built-in current sources for sensor excitation?
Yes, it features matched 200µA current sources for sensor excitation.
- What is the operating temperature range of the MAX1402EAI+?
The operating temperature range is from -40°C to +85°C.
- What type of package is the MAX1402EAI+ available in?
The device is available in a 28-pin SSOP package.
- How does the MAX1402EAI+ manage power consumption?
The device has a low quiescent current of 250µA in operating mode and 2µA in power-down mode.
- Does the MAX1402EAI+ support automatic channel scanning?
Yes, it supports automatic channel scanning and continuous data output mode.
- What type of serial interface does the MAX1402EAI+ use?
The device uses a 3-wire serial interface that is SPI/QSPI compatible.
