Analog Devices Inc./Maxim Integrated MAX158BCPI

Overview

MAX158BCPI from Maxim Integrated is an 8-bit, 8-channel high-speed analog-to-digital converter with 2.5 µs conversion time per channel, internal 2.5 V reference, and built-in track/hold - enabling standalone data acquisition in telecom and servo control systems operating from a single +5 V supply.

For engineers reviewing the MAX158BCPI datasheet, MAX158BCPI pinout, MAX158BCPI application, or MAX158BCPI equivalent, this page delivers verified electrical specs, DIP-28 package mapping, real-world interface timing (Mode 0/1), accuracy limits (±1 LSB), and direct alternatives for industrial signal conditioning designs.

Technical Context

The MAX158BCPI employs a half-flash architecture with two 4-bit flash ADC sections and an internal DAC to generate 8-bit results using 31 comparators. Its multiplexer supports eight analog inputs (AIN1–AIN8) selected via A0/A1/A2 address lines, with conversion triggered by CS/RD falling edges.

Digital interface operates in Mode 0 (WAIT-state compatible) or Mode 1 (non-WAIT), with RDY (open-drain) and INT outputs providing status signaling. The device requires no external clock and maintains full performance across 0°C to +70°C with ±1 LSB total unadjusted error.

Key Specifications

Pinout & Package

MAX158BCPI is housed in a 28-pin plastic DIP package (0.600" wide), pin-compatible with industry-standard through-hole PCB layouts and socket-based prototyping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX158ACPI, MAX158BCPI trades ±0.5 LSB accuracy for lower unit cost while retaining identical timing, package, and feature set; versus ADS7822U, it provides 8-channel parallel operation and full integration at the expense of resolution and serial interface flexibility.

Availability

MAX158BCPI is available at Aetrix Electronics and suitable for telecommunications signal monitoring, digital servo control feedback, and industrial data acquisition requiring stable component supply across extended production lifecycles.

Supply support for MAX158BCPI 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 and mixed-signal ICs for industrial, communications, and computing applications, emphasizing integration, reliability, and thermal robustness.

The MAX154/MAX158 product line delivers complete, single-supply data acquisition solutions targeting high-speed, multi-channel measurement in space-constrained systems where external components must be minimized.

FAQ

What is the guaranteed accuracy specification for MAX158BCPI?

The MAX158BCPI guarantees ±1 LSB total unadjusted error over its full operating temperature range (0°C to +70°C), including offset, full-scale, and linearity contributions. This is confirmed in the Electrical Characteristics table under "Total Unadjusted Error" for MAX158BCPI ordering grade. The MAX158BCPI achieves no-missing-codes performance at 8 bits, ensuring monotonic transfer behavior critical for closed-loop control stability.

Does MAX158BCPI require an external clock signal to operate?

No, the MAX158BCPI does not require an external clock. All timing-including conversion initiation, multiplexer addressing, and data latching-is internally generated from the CS and RD control signal edges. This eliminates clock distribution challenges and jitter sensitivity, making MAX158BCPI suitable for systems where clock routing is constrained or where deterministic timing from processor handshakes is preferred.

Can MAX158BCPI interface directly with an 8051 microcontroller?

Yes, MAX158BCPI supports direct interfacing with the 8051 family via its Mode 0 or Mode 1 digital interface. In Mode 0, RDY connects to the 8051's READY pin to extend instruction cycles; in Mode 1, RD and CS trigger conversions and read prior results without WAIT states. The three-state DB0–DB7 outputs and standard TTL-compatible logic levels ensure seamless bus connection without level shifters or buffers.

What is the function of the REF OUT pin on MAX158BCPI?

The REF OUT pin on MAX158BCPI provides a buffered 2.50 V ±30 mV reference voltage derived from the internal bandgap circuit. It serves dual roles: (1) as the VREF+ input when tied directly to pin 14, establishing a 0 V to 2.5 V input range; or (2) as a stable excitation source for external sensors or op-amp biasing. A 0.01 µF ceramic capacitor to GND is mandatory for stability.

How does the track/hold function operate inside MAX158BCPI?

The MAX158BCPI integrates a track/hold circuit that automatically engages during the first ~1 µs of each conversion cycle. During tracking, the analog input is continuously sampled; at the end of this phase, the input voltage is held steady while the half-flash conversion proceeds. This internal function eliminates external track/hold ICs and associated timing skew, preserving signal integrity for fast-changing inputs up to 157 mV/µs slew rate.