Analog Devices Inc./Maxim Integrated MAX147AEAP+T

Overview

MAX147AEAP+T from Maxim Integrated is a 12-bit, 8-channel serial analog-to-digital converter (ADC) with software-configurable unipolar/bipolar and single-ended/differential inputs, 133ksps conversion rate, ±0.5 LSB INL, and +2.7V to +5.25V single-supply operation - used in portable data loggers and battery-powered medical instruments.

For engineers reviewing the MAX147AEAP+T datasheet, MAX147AEAP+T pinout, MAX147AEAP+T application, or MAX147AEAP+T equivalent, this page delivers verified electrical specs, validated SPI/QSPI/MICROWIRE interface behavior, confirmed 20-pin SSOP package mapping, and real-world timing constraints for low-power embedded acquisition systems.

Technical Context

The MAX147AEAP+T implements successive-approximation architecture with integrated track/hold, supporting both internal clock (for autonomous conversion control) and external serial clock (for precise system synchronization). It uses a 12-bit capacitive DAC and pseudo-differential sampling topology where only the IN+ node is actively sampled while IN− must remain stable within ±0.5 LSB.

Its analog front-end accepts up to eight single-ended or four differential input pairs (CH0/CH1 through CH6/CH7), with COM pin serving as zero-reference in single-ended mode. The device requires an external reference voltage applied at VREF (2.500 V typical), and features REFADJ for ±1.5% buffer gain adjustment - no internal reference.

Key Specifications

Pinout & Package

MAX147AEAP+T is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, JEDEC MO-153 compliant, suitable for automated PCB assembly and space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit serial ADC applications.

Compared with ADS7822U and AD7490BRUZ, MAX147AEAP+T uniquely balances external reference precision, pseudo-differential input flexibility, and ultra-low 1 µA shutdown current - making it optimal for battery-operated, multi-sensor acquisition where reference stability and power budget are critical.

Availability

MAX147AEAP+T is available at Aetrix Electronics and suitable for portable data logging, battery-powered medical devices, and industrial process monitoring requiring stable component supply and long-term production continuity.

Supply support for MAX147AEAP+T 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 high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.

The MAX146/MAX147 product line was designed for low-power, multi-channel data acquisition in space- and energy-constrained systems - emphasizing flexible input configuration, SPI compatibility, and precision external reference support.

FAQ

What is the maximum sampling rate supported by the MAX147AEAP+T?

The MAX147AEAP+T achieves a maximum conversion rate of 133 ksps when using a 2.0 MHz external serial clock and 15 clock cycles per conversion. This corresponds to a conversion time of 7.5 µs and supports full-power analog input bandwidth up to 65 kHz. At lower clock frequencies or with internal clock mode, the rate decreases accordingly - e.g., ~100 ksps at 1.5 MHz SCLK.

Does the MAX147AEAP+T include an internal voltage reference?

No, the MAX147AEAP+T does not include an internal voltage reference. Unlike the MAX146 variant, the MAX147AEAP+T requires an external 2.500 V reference applied to the VREF pin. Its internal reference buffer is disabled by default and must be enabled only if using REFADJ for gain adjustment - which still depends on an external reference source.

How is differential input configured on the MAX147AEAP+T?

Differential input on the MAX147AEAP+T is configured via the 8-bit control byte: set SGL/DIF = 0 (bit 2), then select channel pairs using SEL2–SEL0 (bits 6–4). Valid pairs are CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. The device performs pseudo-differential sampling - only the positive input (IN+) is actively acquired, while the negative input (IN−) must remain stable within ±0.5 LSB relative to AGND.

What are the power-down modes available on the MAX147AEAP+T?

The MAX147AEAP+T supports two power-down states controlled by PD1/PD0 bits in the control byte: full power-down (PD1=0, PD0=0) draws 1 µA, and external clock mode (PD1=1, PD0=1) maintains interface readiness while minimizing analog section current. The SHDN pin provides hardware-level shutdown: pulling it low forces full power-down regardless of control byte settings.

Is the MAX147AEAP+T compatible with standard SPI interfaces?

Yes, the MAX147AEAP+T is fully compatible with standard SPI interfaces when configured with CPOL = 0 and CPHA = 0. It uses a 4-wire interface (CS, DIN, DOUT, SCLK) with MSB-first, falling-edge data capture on DOUT and rising-edge sampling on DIN. The SSTRB output provides additional hardware handshake timing for TMS320-family DSPs and other synchronous processors.