Analog Devices Inc./Maxim Integrated MAX114EAG+

Overview

MAX114EAG+ from Maxim Integrated is a microprocessor-compatible, 8-bit, 4-channel analog-to-digital converter (ADC) using half-flash architecture to achieve 660ns conversion time (1Msps) with single +5V supply operation. It features an internal track/hold, ratiometric reference configuration, and power-down mode reducing supply current to 1µA. It is used in high-speed data acquisition systems requiring fast burst-mode sampling and low quiescent power.

For engineers reviewing the MAX114EAG+ datasheet, MAX114EAG+ pinout, MAX114EAG+ application, or MAX114EAG+ equivalent, this page delivers verified technical context, real-world interface timing constraints, confirmed analog input behavior, and validated alternative options for industrial and portable measurement systems.

Technical Context

The MAX114EAG+ implements a two-stage half-flash ADC architecture: a 4-bit flash section generates the MSBs and drives an internal DAC to produce a residue voltage, which is then quantized by a second 4-bit flash section to yield the full 8-bit result. This enables 1Msps throughput without external clocking.

It supports two digital interface modes controlled by the MODE pin: read mode (MODE = GND) uses RD to initiate conversion and access latched data, while write-read mode (MODE = VDD) uses WR to start conversion and RD to read output. Channel selection is performed via A0–A2 address inputs, with four analog inputs (IN1–IN4) routed through an internal multiplexer.

Key Specifications

Pinout & Package

The MAX114EAG+ is housed in a 24-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, JEDEC MO-153 compliant, body size 7.5mm × 4.4mm, and exposed pad not present. Thermal resistance θJA = 125°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit, multi-channel ADC applications.

Compared with MAX114CAG+, MAX114EAG+ extends operational reliability to −40°C startup and +85°C sustained operation, while ADS7822U trades 1Msps parallel throughput for SPI simplicity and lower active power-making each viable only in distinct thermal, interface, and performance contexts.

Availability

MAX114EAG+ is available at Aetrix Electronics and suitable for high-speed data acquisition, portable instrumentation, and industrial motor control applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX114EAG+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, communications, and computing applications.

The MAX114EAG+ belongs to Maxim's high-speed data converter product line, engineered specifically for µP-based systems needing fast, low-power, multi-channel digitization without external clocks or support components.

FAQ

What is the maximum sampling rate achievable with the MAX114EAG+?

The MAX114EAG+ achieves a maximum sampling rate of 1.23MHz in write-read mode with tRD < tINTL timing (tWR + tRD + tRI + tACQ = 250ns + 250ns + 150ns + 160ns). This assumes optimal layout, proper bypassing, and adherence to specified load conditions (CL = 50pF, RL = 5.1kΩ). At 1MHz, the device delivers 45dB SINAD and guaranteed no-missing-codes performance. The MAX114EAG+ does not support continuous 1.23MHz operation in all configurations-actual rate depends on µP interface timing margins and acquisition setup.

How does the power-down mode of the MAX114EAG+ work, and what is the wake-up latency?

The MAX114EAG+ enters power-down mode when PWRDN is driven low, reducing VDD supply current to 1µA typical. Wake-up occurs on PWRDN high transition; the internal circuitry powers up in <200ns, after which the track/hold acquires the selected analog input in 360ns total (including power-up delay and acquisition time). During power-down, digital inputs must be held at VDD or GND to prevent leakage-induced current increase. The MAX114EAG+ does not retain channel selection or mode state across power-down cycles-reinitialization is required.

Can the MAX114EAG+ operate with a 3V supply?

No, the MAX114EAG+ is specified only for +4.75V to +5.25V operation. Its internal reference ladder, comparator thresholds, and output drivers are designed for 5V logic levels and analog headroom. For +3V applications, Maxim recommends the pin-compatible MAX113/MAX117 family, which shares the same architecture and feature set but is characterized across 2.7V–3.6V. Attempting to operate the MAX114EAG+ below 4.75V violates absolute maximum ratings and results in undefined conversion accuracy, timing, or functionality.

What is the purpose of the MODE pin on the MAX114EAG+, and how should it be configured?

The MODE pin selects between read mode (MODE = GND) and write-read mode (MODE = VDD). In read mode, RD initiates conversion and data access; WR/RDY functions as a ready-status output (RDY). In write-read mode, WR starts conversion and RD reads data; WR/RDY serves as a write input. MODE is internally pulled low with a 50µA current source, so leaving it unconnected defaults to read mode. The MAX114EAG+ requires stable MODE voltage before CS activation-floating MODE during operation may cause interface instability or incorrect data latching.

Does the MAX114EAG+ require an external clock signal to operate?

No, the MAX114EAG+ does not require an external clock. Its half-flash architecture uses internally generated timing derived from the VDD supply and on-chip RC networks, enabling autonomous 1Msps operation. All timing parameters-including conversion time (660ns), acquisition time (160ns), and interrupt delay-are self-contained and specified under standard load conditions (CL = 50pF). External clocking is neither supported nor necessary; adding one would not improve performance and could disrupt internal timing synchronization.