Analog Devices Inc./Maxim Integrated MAX153CWP+

Overview

MAX153CWP+ from Maxim Integrated is a high-speed, µP-compatible 8-bit analog-to-digital converter (ADC) using half-flash architecture to deliver 660ns conversion time and 1Msps throughput. It operates from single +5V or dual ±5V supplies, supports unipolar/bipolar inputs, and features a dedicated POWERDN pin enabling 1µA typical power-down current-ideal for burst-mode data acquisition in battery-powered systems.

For engineers reviewing the MAX153CWP+ datasheet, MAX153CWP+ pinout, MAX153CWP+ application, or MAX153CWP+ equivalent, key selection criteria include guaranteed 8-bit resolution with ±1 LSB total unadjusted error, ratiometric reference capability, internal track/hold, and direct µP bus interface without external logic.

Technical Context

The MAX153CWP+ implements a two-stage half-flash conversion architecture: first, a 4-bit flash ADC generates the MSBs and drives an internal 4-bit DAC; the DAC's residue voltage is then digitized by a second 4-bit flash ADC to produce the LSBs. This structure enables deterministic 660ns conversion in WR-RD mode while maintaining monotonicity and no missing codes.

Its digital interface supports three operational modes-RD mode (MODE = GND), WR-RD mode (MODE = VDD), and pipelined mode (WR tied to RD)-each with distinct timing constraints and interrupt behavior. The device integrates latched, three-state output drivers compatible with TTL/CMOS buses and features open-drain RDY/INT outputs with defined setup/hold and access timing across temperature.

Key Specifications

Pinout & Package

MAX153CWP+ is housed in a 20-pin SOIC-Wide (SO(W)) package per outline 21-0042, RoHS-compliant with lead-free finish (+ suffix). Dimensions: 12.8mm × 7.5mm × 2.3mm, 1.27mm pitch.

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 MAX1113ECM+, the MAX153CWP+ uniquely combines µP-bus compatibility, 1µA power-down, ratiometric reference, and guaranteed no-missing-codes in a single SO(W) package-making it optimal for cost-sensitive, battery-aware, and layout-constrained embedded systems.

Availability

MAX153CWP+ is available at Aetrix Electronics and suitable for cellular telephones, portable radios, and burst-mode data acquisition systems requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX153CWP+ 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 precision analog, mixed-signal, and high-frequency ICs for industrial, communications, and consumer applications.

The MAX153CWP+ belongs to Maxim's high-speed data acquisition product line, designed specifically for µP-coupled, low-power, real-time sampling applications where deterministic timing and minimal external components are essential.

FAQ

What is the maximum sampling rate achievable with the MAX153CWP+?

The MAX153CWP+ achieves a maximum sampling rate of 1.23MHz in WR-RD mode with tRD > tINTL timing configuration. This is calculated from tWR (250ns) + tRD (250ns) + tRI (150ns) + tP (165ns). At 1Msps, the device delivers guaranteed 8-bit accuracy with ±1 LSB total unadjusted error across its 0°C to +70°C operating range. The MAX153CWP+ maintains this rate under both unipolar and bipolar input conditions when powered from +5V.

Does the MAX153CWP+ require an external clock signal?

No, the MAX153CWP+ does not require an external clock signal. Its internal timing and control circuitry generate all necessary clocks for conversion, track/hold, and data latching. This eliminates clock distribution challenges and reduces system-level jitter sensitivity. The MAX153CWP+ initiates conversion via digital control signals (WR or RD), making it ideal for µP-based systems where clock resources are constrained or shared among multiple peripherals.

How does the power-down feature of the MAX153CWP+ operate, and what conditions must be met?

The MAX153CWP+ enters power-down mode when the PWRDN pin is driven low, reducing VDD supply current to 1µA typical. Critical conditions include: CS must be held high to prevent spurious conversion attempts; MODE should be low (RD mode) to minimize current via its internal 50µA pulldown; and all digital inputs (WR, RD, MODE) must remain stable. The MAX153CWP+ wakes up in under 200ns, allowing rapid resumption of sampling after wake-up-essential for burst-mode applications.

Can the MAX153CWP+ interface directly with a microprocessor data bus without additional logic?

Yes, the MAX153CWP+ interfaces directly with a microprocessor data bus. Its D0–D7 outputs use latched, three-state buffered circuitry compatible with TTL/CMOS logic levels, and its RD/WR/CS control scheme appears as a memory-mapped I/O port. No external address decoders, bus transceivers, or timing glue logic are needed. The MAX153CWP+ supports both RD mode (conversion triggered by RD) and WR-RD mode (conversion triggered by WR), providing flexibility across µP architectures.

What is the significance of ratiometric reference operation in the MAX153CWP+?

Ratiometric reference operation in the MAX153CWP+ means its conversion result is proportional to the ratio of VIN to (VREF+ − VREF−), not absolute reference voltage. This allows direct interfacing with resistive sensors (e.g., RTDs, strain gauges) or supply-referenced signal chains where VREF+ and VIN share the same excitation source. The MAX153CWP+ maintains measurement accuracy even if the supply voltage varies-critical in battery-powered systems where VDD sags from 4.2V to 3.3V during discharge.