Analog Devices Inc./Maxim Integrated MAX154ACNG

Overview

The MAX154ACNG from Maxim Integrated is a high-speed 8-bit analog-to-digital converter (ADC) with four-channel multiplexer, on-chip 2.5V reference, built-in track/hold, 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 - enabling real-time data acquisition in telecom baseband receivers.

For engineers reviewing the MAX154ACNG datasheet, MAX154ACNG pinout, MAX154ACNG application, or MAX154ACNG equivalent, this page delivers verified technical context, exact pin functions, confirmed accuracy specs (±1/2 LSB total unadjusted error), package mapping (24-pin narrow plastic DIP), and two validated alternative parts for design continuity.

Technical Context

The MAX154ACNG employs a half-flash architecture with dual 4-bit flash ADC sections and an internal DAC to generate the lower 4 bits from the residue voltage. Its timing-critical operation requires precise control of CS and RD signals to initiate conversions and latch address/data - supporting both Mode 0 (WAIT-state microprocessors) and Mode 1 (non-WAIT systems) digital interfacing.

It features a fully integrated reference subsystem: VREF+ and VREF− define the full-scale span, while REF OUT provides a buffered 2.47–2.53V output (±10mV load regulation). Analog input settling relies on internal 31 comparator capacitors (≈45pF total CAIN) and fixed 1µs tracking window - demanding source impedances ≤100Ω to avoid acquisition errors.

Key Specifications

Pinout & Package

MAX154ACNG is housed in a 24-pin narrow plastic DIP (Dual In-line Package) with 0.300" body width and 0.100" lead pitch - compatible with standard through-hole PCB assembly and socketing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX154BCNG, the MAX154ACNG offers tighter DC accuracy for precision measurement; compared with ADS7822U, it integrates multiplexing and reference but occupies more PCB area and lacks SPI interface flexibility.

Availability

MAX154ACNG is available at Aetrix Electronics and suitable for telecommunications baseband sampling, high-speed servo control feedback, and audio instrumentation data capture requiring stable component supply across industrial temperature ranges.

Supply support for MAX154ACNG 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, communications, and computing applications - emphasizing integration, low power, and high reliability.

The MAX154ACNG belongs to Maxim's high-speed data acquisition product line, engineered specifically for embedded systems needing compact, self-contained ADC solutions with minimal external components and deterministic timing behavior.

FAQ

What is the operating temperature range for the MAX154ACNG?

The MAX154ACNG is specified for operation from 0°C to +70°C - denoted by the 'C' suffix in its part number. This commercial-grade temperature range supports use in office equipment, test instrumentation, and non-extreme industrial environments. The device maintains ±1/2 LSB total unadjusted error across this full range, as confirmed in the Electrical Characteristics table under MAX15_C conditions.

Does the MAX154ACNG require an external clock source?

No, the MAX154ACNG does not require an external clock. Its conversion timing is internally generated and controlled solely by the CS and RD input signals - as stated in the Features list ("No External Clock") and verified in the Timing Characteristics section. Conversion starts on the falling edge of CS and RD, with fixed 2.5µs duration independent of external timing sources.

Can the MAX154ACNG operate with a reference voltage other than the internal 2.5V?

Yes, the MAX154ACNG supports external reference configurations. VREF+ and VREF− pins define the full-scale span, allowing connection to external precision references (e.g., 2.048V or 4.096V) or the power supply itself. The internal 2.5V REF OUT is optional - it may be disabled by leaving REF OUT unconnected or using VREF+ and VREF− directly, as shown in Figure 8b and Figure 8c of the datasheet.

What is the maximum recommended source impedance for analog inputs on the MAX154ACNG?

The MAX154ACNG requires analog source impedance ≤100Ω to ensure full 2.5µs conversion accuracy. This limit arises from the internal 45pF input capacitance and fixed 1µs acquisition window - higher impedances cause incomplete settling and measurable gain/linearity errors. The datasheet explicitly states "large source resistances (greater than 100Ω) will cause settling errors" in the Analog Considerations section.

Is the MAX154ACNG pin-compatible with the MAX158 series?

No, the MAX154ACNG is not pin-compatible with any MAX158 variant. The MAX154 uses a 24-pin package with four analog inputs (AIN1–AIN4) and no A2 pin, while the MAX158 uses a 28-pin package with eight inputs (AIN1–AIN8) and requires A2 for channel addressing. Pin 23 is N.C. on MAX154ACNG but carries A2 on MAX158 - making direct PCB substitution impossible without layout revision.