Analog Devices Inc./Maxim Integrated MAX152CAP

Overview

MAX152CAP from Maxim Integrated is an 8-bit, 400ksps microprocessor-compatible analog-to-digital converter (ADC) using half-flash architecture to achieve 1.8µs conversion time. It operates from a single +3.0V to +3.6V supply, supports unipolar/bipolar inputs, and features 1µA power-down current for burst-mode data acquisition in battery-powered systems.

For engineers reviewing the MAX152CAP datasheet, MAX152CAP pinout, MAX152CAP application, or MAX152CAP equivalent, this page delivers verified electrical parameters, timing-critical interface behavior (RD/WR-RD modes), ratiometric reference operation, and real-world design constraints including input capacitance (22pF), full-power bandwidth (300kHz), and 900ns wake-up latency - all essential for high-speed servo loop or portable telecom signal chain implementation.

Technical Context

The MAX152CAP implements a two-stage half-flash architecture: first, a 4-bit flash ADC resolves the MSBs; then an internal 4-bit DAC generates a residue voltage, which a second 4-bit flash stage converts to the LSBs. This achieves 8-bit resolution with only 15 comparators and eliminates external clock dependency.

Its digital interface supports three operational modes - RD mode (MODE = 0), WR-RD mode (MODE = 1, tRD < tINTL for fastest 1.8µs throughput), and stand-alone mode (CS = RD = GND) - each with distinct timing relationships among WR/RDY, RD, INT, and CS. Power-down activation via PWRDN pin reduces VDD current to 1µA while preserving sub-µs wake-up capability.

Key Specifications

Pinout & Package

MAX152CAP is packaged in a 20-pin plastic DIP (dual-in-line package) with 0.300" wide body and 0.100" lead pitch, rated for 0°C to +70°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX11200ASA+, the MAX152CAP uniquely balances 400ksps throughput, 1.8µs deterministic latency, parallel µP interface, and 1µA power-down - making it irreplaceable in battery-constrained, high-speed closed-loop systems requiring minimal firmware overhead.

Availability

MAX152CAP is available at Aetrix Electronics and suitable for cellular telephony, portable radio, and burst-mode data acquisition requiring stable component supply across commercial temperature range (0°C to +70°C) and long-term production continuity.

Supply support for MAX152CAP 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, automotive, and communications applications.

The MAX152CAP belongs to Maxim's high-speed data acquisition product line, engineered specifically for µP-centric, low-voltage, battery-sensitive systems needing rapid, deterministic analog digitization without external clocks or support components.

FAQ

What is the absolute maximum supply voltage rating for MAX152CAP?

The MAX152CAP has an absolute maximum VDD-to-GND rating of –0.3V to +7V. Exceeding +3.6V during normal operation violates the specified supply range and may cause parametric shift or accelerated aging. The device is characterized and guaranteed only from +3.0V to +3.6V; operation outside this window voids accuracy and timing specifications. Always use 4.7µF + 0.1µF bypassing at VDD to suppress transients that could breach absolute ratings.

How does the MAX152CAP achieve 1.8µs conversion time without an external clock?

The MAX152CAP achieves 1.8µs conversion time using an internal timing generator synchronized to the WR or RD control edges - no external clock is needed. Its half-flash architecture divides the 8-bit conversion into two 4-bit stages, each resolved by dedicated flash comparators and DAC residue generation. Timing is fully determined by supply voltage and control signal slew rates, with conversion time decreasing as VDD increases from 3.0V to 3.6V per the Typical Operating Characteristics graph.

Can MAX152CAP operate with bipolar input ranges, and what are the supply requirements?

Yes, MAX152CAP supports bipolar inputs (VREF– to VREF+) when configured with VSS = –3.0V to –3.6V and VREF– = –1.5V, VREF+ = +1.5V. In this mode, the analog input range is ±1.5V, producing codes from 0x00 (–FS) to 0xFF (+FS). Unipolar operation uses VSS = GND and VREF– = GND, VREF+ = VDD. Bipolar mode requires dual supplies and careful grounding to avoid latch-up; the datasheet specifies separate accuracy tests for each configuration.

What is the purpose of the MODE pin on MAX152CAP, and how does it affect timing?

The MODE pin selects between RD mode (MODE = 0) and WR-RD mode (MODE = 1). In RD mode, a single RD pulse initiates and reads conversion, with WR/RDY acting as a ready output. In WR-RD mode, WR starts conversion and RD reads result, enabling pipelining. Timing differs critically: WR-RD with tRD < tINTL achieves 1.8µs total conversion, while RD mode takes 2.0µs. MODE must be hard-wired or controlled synchronously - floating MODE causes undefined behavior due to internal 15µA pull-down.

Does MAX152CAP require external components for stable operation, and which ones are mandatory?

Yes, MAX152CAP requires mandatory external components: a 4.7µF electrolytic + 0.1µF ceramic capacitor from VDD to GND, and 0.1µF ceramics from VREF+ and VREF– to GND. These suppress supply noise and reference ripple that directly degrade SNR and THD. Input source impedance must be ≤2.2kΩ to settle within the 450ns acquisition time (tP); higher impedances require longer tP or external buffering. No external clock, resistors, or logic gates are needed for basic operation.