Analog Devices Inc./Maxim Integrated MAX154BCNG

Overview

MAX154BCNG from Maxim Integrated is a 4-channel, 8-bit CMOS analog-to-digital converter (ADC) with integrated track/hold, on-chip 2.5V reference, and 2.5µs conversion time per channel. 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 high-speed data acquisition systems requiring compact, self-contained signal digitization.

For engineers reviewing the MAX154BCNG datasheet, MAX154BCNG pinout, MAX154BCNG application, or MAX154BCNG equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in Maxim's official specifications for the 24-pin narrow plastic DIP package at 0°C to +70°C.

Technical Context

The MAX154BCNG employs a half-flash architecture with two 4-bit flash ADC sections and an internal DAC to generate full 8-bit results using only 15 comparators. Its conversion sequence begins on the falling edge of CS and RD, with MS bits latched after ~1µs of tracking and LS bits completed within 2.5µs total.

Digital interface supports two modes: Mode 0 (WAIT-state compatible) uses RDY to extend microprocessor read cycles, while Mode 1 enables pipelined operation where RD simultaneously initiates a new conversion and reads prior result. INT asserts low upon conversion completion; RDY is open-drain and tied to READY/WAIT input.

Key Specifications

Pinout & Package

MAX154BCNG is housed in a 24-pin narrow plastic DIP (Dual In-line Package), 0.300" wide, with 0.1" lead pitch. Pin 1 is marked by notch or dot; pin numbering follows standard counter-clockwise convention from top view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX154ACNG, the MAX154BCNG trades minor accuracy tolerance (±1 LSB vs. ±1/2 LSB) for broader production availability and lower unit cost, while retaining identical timing, interface, and functional behavior. Against ADS7822U, MAX154BCNG offers true plug-and-play integration - no firmware changes, no external reference, and no track/hold redesign needed.

Availability

MAX154BCNG is available at Aetrix Electronics and suitable for high-speed data acquisition, telecommunications monitoring, and servo control applications requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX154BCNG 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, communications, and computing applications.

The MAX154BCNG belongs to Maxim's high-speed data acquisition product line, engineered specifically for embedded systems needing self-contained, low-latency digitization without external support components.

FAQ

What is the operating temperature range for MAX154BCNG?

The MAX154BCNG is specified for operation from 0°C to +70°C. This commercial-grade temperature range is confirmed in the Ordering Information table and applies to all electrical characteristics unless otherwise noted. The 'C' suffix in MAX154BCNG explicitly denotes the 0°C to +70°C grade, distinguishing it from 'E' (–40°C to +85°C) and 'M' (–55°C to +125°C) variants. All timing, accuracy, and interface behavior described in the datasheet are guaranteed within this range.

Does MAX154BCNG require an external clock signal?

No, the MAX154BCNG does not require an external clock signal. Its conversion is fully self-timed using internal logic and comparator propagation delays. The device initiates and completes conversion based solely on the timing of CS and RD control signals - as detailed in the Digital Interface section and Mode 0/Mode 1 timing diagrams. This eliminates clock jitter concerns and reduces system-level timing complexity.

Can MAX154BCNG operate with a 3.3V microprocessor interface?

MAX154BCNG outputs are CMOS-compatible and specified for V_OH ≥ 4.0V and V_OL ≤ 0.4V under I_OH = –1.6mA and I_OL = 16mA loads, making them unsuitable for direct connection to 3.3V logic without level translation. While the data bus can be isolated using 3.3V-tolerant buffers, the MAX154BCNG itself requires a +5V supply and produces 5V-level outputs - confirmed in the LOGIC OUTPUTS table on page 3 of the datasheet.

What is the function of the N.C. pin on MAX154BCNG?

Pin 7 of the MAX154BCNG is designated N.C. (No Connect) - it is not bonded internally and carries no electrical function. Per Maxim's Pin Descriptions and Package Information, this pin must be left unconnected or tied to GND for mechanical stability; driving it or routing signals to it may cause unpredictable behavior. This differs from MAX158 variants, which use this location for A2 addressing.

How does the internal 2.5V reference affect the analog input range of MAX154BCNG?

The internal 2.5V reference sets the full-scale span between VREF− and VREF+, but the MAX154BCNG's analog input range remains 0V to +5V because VREF+ is externally tied to VDD (+5V) and VREF− to GND. The 2.5V reference appears on REF OUT for external use and stabilizes the internal ladder - it does not constrain the input voltage range. This configuration is explicitly shown in Figure 8a and confirmed in the Analog Considerations section.