MAX14890E

PRODUCTION

Incremental Encoder Interface for RS-422, HTL, and TTL with Digital Inputs

Industry's Most Robust Quad RS-422/TTL/HTL Receivers + 2 DI

Data Sheet (Rev. 2) Product Selection Table

Part Models: 2
1ku List Price: Starting From $4.15

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Overview

High Flexibility Supports All Encoder Types
- Selectable RS-422/HTL/TTL/DI Receivers
- RS-422 Switching Rates Up to 35Mbps
- TTL Switching Rates Up to 5MHz
- HTL Switching Rates Up to 400kHz
- SPI or Pin-Controlled Operation
- SPI Interface Allows Per-Receiver Configuration
- 1.62V to 5.5V Logic Interface
Integrated Fault Detection Reduces Down-Time
- Open-Wire and Short-Circuit Detection
- Overvoltage and Undervoltage Fault Detection
Integrated Protection Ensures Robust Communication
- ±40V Fault Protection Range
- ±20V RS-422 Common Mode Range
- DI Glitch Filters
- ±25kV HBM ESD
- ±7kV Air-Gap per IEC 61000-4-2 ESD
- ±10kV Contact per IEC 61000-4-2 ESD
- -40°C to +125°C Operating Temperature Range

The MAX14890E incremental encoder receiver contains four differential receivers and two single-ended receivers.

The differential receivers can be operated in RS-422 or differential high-threshold logic (HTL) modes and are optionally configurable for single-ended TTL/HTL operation. The MAX14890E features a wide common mode input range of -20V to +20V in RS-422 mode.

The auxiliary IEC 61131-2 Type-1/Type-3 digital inputs are designed for operation with switches or proximity sensors and can be individually configured for TTL operation.

All receiver input signals are fault protected to voltage shorts in the ±40V range. Per channel fault detection provides warning of irregular conditions such as small differential signals, shorts, opens, overvoltages, and undervoltages.

The MAX14890E features a pin-selectable SPI or parallel-logic interface. SPI control provides detailed diagnostics and individual configurations for receivers.

The MAX14890E is available in a 32-pin TQFN-EP (5mm x 5mm) and operates over the -40°C to +125°C temperature range.

Applications

Encoder Interfaces
Motor Controllers
Pulse Counters
Servo Control Commutation

Part Models: 2
1ku List Price: Starting From $4.15

Documentation

Data Sheet 1

MAX14890E: Incremental Encoder Interface for RS-422, HTL, and TTL with Digital Inputs Data Sheet (Rev.2) 06/16/2020

Reliability Data 1

MAX14890E Reliability Data 01/12/2023

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX14890EATJ+	32-LFCSP-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX14890EATJ+T	32-LFCSP-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 6, 2025 - 2455N ASSEMBLY
		pcn_2455n
MAX14890EATJ+	PRODUCTION
MAX14890EATJ+T	PRODUCTION
Jan 17, 2018 - 1722C ASSEMBLY
		pcn_1722c
MAX14890EATJ+	PRODUCTION
MAX14890EATJ+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Tools & Simulations

Software Development 1

MAX14890E EVKIT Software, 1.0.0

IBIS Model 1

MAX14890E IBIS Model

Evaluation Kits

Evaluation Kit for MAX14890E

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Features and Benefits

Four Configurable Differential or Single-Ended Receivers
SPI or Pin-Controlled Operation USB-PC Connection
Proven PCB Layout
Fully Assembled and Tested

Product Details

The MAX14890E evaluation kit (EV kit) is a fully assembled and tested PCB that contains the MAX14890E incremental encoder interface. The MAX14890E incremental encoder receiver contains four differential receivers and two single-ended receivers for RS-422, HTL, TTL, and digital signals.

Power for the transceiver can be provided from a single +5V source or from an on-board 24V to 5V step-down circuit. The MAX14890E EV kit includes terminal blocks for motor and power connections.

On-board switches and jumpers are included to configure the MAX14890E in pin-control mode. The evaluation board is also designed with the Arduino^® form-factor for easy software evaluation and development.