Analog Devices Inc./Maxim Integrated MAX114CAG+T

Overview

The MAX114CAG+T from Maxim Integrated is a microprocessor-compatible, 8-bit, 4-channel analog-to-digital converter (ADC) using half-flash architecture to achieve 1 Msps sampling rate with 660 ns conversion time per channel. It operates from a single +5V supply, features an internal track/hold, and supports ratiometric operation via configurable reference inputs (REF+, REF−). It is used in high-speed data acquisition systems requiring low-power burst-mode operation.

For engineers reviewing the MAX114CAG+T datasheet, MAX114CAG+T pinout, MAX114CAG+T application, or MAX114CAG+T equivalent, this page delivers verified technical context, real-world interface timing constraints, confirmed power-down behavior (1 µA), and precise analog input performance metrics - all specific to the MAX114CAG+T SSOP-24 variant.

Technical Context

The MAX114CAG+T implements a two-stage half-flash ADC architecture: a 4-bit flash section generates the MSBs and a residue voltage, which is then converted by a second 4-bit flash section to yield the full 8-bit result. This design achieves 660 ns conversion time while maintaining ≤1 LSB total unadjusted error across 0°C to +70°C.

It supports two digital interface modes controlled by the MODE pin: read mode (MODE = GND) uses RD for conversion start and data access, while write-read mode (MODE = VDD) initiates conversion on WR falling edge and latches MSBs before LSBs. Channel selection is performed via A0–A2 address inputs, selecting among four analog inputs (IN1–IN4).

Key Specifications

Pinout & Package

The MAX114CAG+T is housed in a 24-pin SSOP (Shrink Small Outline Package) with 0.635 mm pitch, JEDEC MO-153 compliant, suitable for surface-mount assembly and space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-channel, 8-bit, high-speed ADC applications.

Compared with MAX115CAG+T, the MAX114CAG+T offers identical functionality at lower cost and temperature grade; compared with ADS7822U, it delivers 5× higher throughput and integrated track/hold - making it superior for time-critical, multi-channel sampling where latency and analog signal integrity are critical.

Availability

The MAX114CAG+T is available at Aetrix Electronics and suitable for high-speed data acquisition, portable test equipment, and communications baseband processing requiring stable component supply and guaranteed SSOP-24 packaging.

Supply support for MAX114CAG+T 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) is a semiconductor company specializing in high-performance analog and mixed-signal ICs for industrial, communications, and consumer applications.

The MAX114CAG+T belongs to Maxim's legacy high-speed ADC product line, designed specifically for microprocessor-based systems needing fast, low-power, multi-channel digitization with minimal external components.

FAQ

What is the maximum sampling rate achievable with the MAX114CAG+T?

The MAX114CAG+T achieves a maximum sampling rate of 1.23 Msps in write-read mode with tRD < tINTL, calculated as 1/(tWR + tRD + tRI + tACQ) = 1/(250 ns + 250 ns + 150 ns + 160 ns). This assumes optimal timing margins and proper signal integrity on WR, RD, and address lines. The MAX114CAG+T sustains this rate across its full 0°C to +70°C operating range with ≤1 LSB total unadjusted error.

Does the MAX114CAG+T require an external clock source?

No, the MAX114CAG+T does not require an external clock. All timing is derived internally from the WR and RD control signals. In read mode, conversion starts on the falling edge of CS and RD; in write-read mode, it starts on the falling edge of WR. The internal half-flash architecture and timing control logic eliminate the need for a dedicated clock input, simplifying system design and reducing component count.

How does the power-down mode function on the MAX114CAG+T?

The MAX114CAG+T enters power-down mode when PWRDN is driven low, reducing VDD supply current to 1 µA typical. Wake-up occurs within 200 ns of PWRDN going high, after which the track/hold acquires the selected analog input in 360 ns total (including power-up delay and acquisition time). For minimum current, all digital inputs must be held at VDD or GND during power-down - floating inputs increase leakage.

Can the MAX114CAG+T operate with a reference voltage other than VDD?

Yes, the MAX114CAG+T supports flexible reference configurations. REF+ can be set to any voltage between REF− and VDD (e.g., 4.096 V from a precision reference), while REF− can be set above GND to enable offset-adjusted input ranges. Ratiometric operation is maintained as long as both REF+ and REF− scale together - for example, using a resistor divider from VDD. The internal 1 kΩ resistance between REF+ and REF− must be accounted for in external reference designs.

What is the purpose of the MODE pin on the MAX114CAG+T?

The MODE pin selects between two digital interface protocols: MODE = GND configures read mode (WR/RDY acts as RDY status output), while MODE = VDD configures write-read mode (WR/RDY acts as WR input). This determines the timing sequence, data latching behavior (MSBs first, then LSBs), and interrupt assertion timing. The pin is internally pulled low with a 50 µA current source, so it defaults to read mode if left unconnected.