Analog Devices Inc./Maxim Integrated MAX158ACWI

Overview

MAX158ACWI from Maxim Integrated is an 8-bit, 8-channel high-speed analog-to-digital converter (ADC) with integrated track/hold, 2.5V on-chip reference, and 2.5µs per-channel conversion time. It operates from a single +5V supply, accepts 0V to +5V analog inputs, and interfaces directly to microprocessor data buses via latched three-state outputs. It is used in real-time speech analysis, telecom channel monitoring, and high-speed servo feedback loops.

For engineers reviewing the MAX158ACWI datasheet, MAX158ACWI pinout, MAX158ACWI application, or MAX158ACWI equivalent, this page delivers verified electrical parameters, validated package mapping (28-pin Wide SO), confirmed timing behavior (Mode 0/1 interface), and two rigorously cross-checked alternative ADCs for multi-channel 8-bit acquisition systems.

Technical Context

The MAX158ACWI employs a half-flash architecture with two 4-bit flash sections and 15 comparators per stage, enabling full 8-bit resolution without external track/hold circuitry. Its internal DAC generates a residue voltage for LSB determination after MSB capture.

Digital interface relies solely on CS and RD control lines, supporting two modes: Mode 0 (WAIT-state compatible, conversion and read synchronized) and Mode 1 (pipelined, concurrent read of prior result and initiation of new conversion). RDY is open-drain; INT is active-low and edge-triggered.

Key Specifications

Pinout & Package

MAX158ACWI is housed in a 28-pin Wide SO (Small Outline) package, 7.65mm × 10.33mm body size, 0.65mm lead pitch, RoHS-compliant, surface-mountable.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX1113ECM, the MAX158ACWI uniquely combines 8-channel count, parallel 8-bit bus interface, and fully integrated reference in a single +5V device-reducing BOM count and layout complexity for real-time multi-signal acquisition.

Availability

MAX158ACWI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and audio test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX158ACWI 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 demanding industrial, automotive, and communications applications.

The MAX154/MAX158 product line was engineered specifically for high-speed, multi-channel data acquisition in space- and power-constrained systems requiring minimal external components and deterministic timing.

FAQ

What is the operating temperature range for MAX158ACWI?

The MAX158ACWI is specified for 0°C to +70°C ambient operation. This commercial-grade temperature range is confirmed in the Ordering Information table on page 11 of the official datasheet, where "MAX158ACWI" is explicitly listed with "0°C to +70°C" under TEMP. RANGE. The device uses standard CMOS process technology and meets all electrical specifications-including ±1/2 LSB total unadjusted error and 2.5µs conversion time-within this range.

Does MAX158ACWI require an external clock signal?

No, the MAX158ACWI does not require an external clock. As stated in the Features section ("No External Clock") and confirmed in the Detailed Description, all timing is generated internally. Conversion is initiated by control signals CS and RD; the 2.5µs conversion time is fixed and independent of external timing sources. This eliminates clock distribution complexity and potential jitter-related errors in sensitive acquisition systems using the MAX158ACWI.

How many analog input channels does MAX158ACWI support?

The MAX158ACWI supports eight analog input channels (AIN1 through AIN8), as clearly differentiated from the four-channel MAX154 in the General Description and Pin Configurations. The 3-bit address bus (A0, A1, A2) selects one of eight channels per conversion cycle. This is further validated in the Truth Table (Table 1), which lists AIN1–AIN8 corresponding to binary addresses 000–111, and in the MAX158-specific pin diagram showing pins 1–4 and 23–28 assigned to AIN1–AIN8.

What package type is used for MAX158ACWI?

The MAX158ACWI uses a 28-pin Wide SO (Small Outline) package, as documented in the Ordering Information table (page 11): "MAX158ACWI" is listed with "28 Wide SO" under PIN-PACKAGE. Mechanical dimensions (7.65mm × 10.33mm body, 0.65mm pitch) match the SOIC-W standard. This surface-mount package provides thermal and mechanical reliability superior to DIP variants while maintaining compatibility with automated PCB assembly processes for the MAX158ACWI.

Can MAX158ACWI operate with a 3.3V microprocessor interface?

The MAX158ACWI's digital outputs (DB0–DB7, INT, RDY) are CMOS-compatible with VOH ≥ 4.0V and VOL ≤ 0.4V at VDD = +5V, per Electrical Characteristics (page 3). Direct interfacing to 3.3V logic is unsafe without level translation, as 5V outputs exceed 3.3V I/O absolute maximum ratings. However, its three-state outputs can be safely isolated using bus switches or resistive dividers. The MAX158ACWI itself requires only +5V supply; it does not support 3.3V VDD operation.