Analog Devices Inc./Maxim Integrated MAX1084AESA

Overview

MAX1084AESA from Maxim Integrated is a 10-bit, 400ksps successive-approximation analog-to-digital converter (ADC) with internal +2.5V reference, single +4.5V to +5.5V supply operation, ±0.5 LSB INL, and SPI/QSPI/MICROWIRE 3-wire serial interface. It integrates track/hold, operates in -40°C to +85°C, and targets space-constrained, low-power data acquisition systems requiring high DC accuracy and dynamic performance.

For engineers reviewing the MAX1084AESA datasheet, MAX1084AESA pinout, MAX1084AESA application, or MAX1084AESA equivalent, this page delivers verified electrical specs, validated 8-pin SO package mapping, confirmed timing behavior at 6.4MHz SCLK, real-world acquisition time (468ns), and precise functional distinctions versus MAX1085 and legacy MAX1242/1243 variants.

Technical Context

The MAX1084AESA uses a capacitive SAR architecture with integrated track/hold and trimmed internal 2.5V reference, enabling unipolar 0–VREF input conversion without external components. Its serial interface requires only CS, SCLK, and DOUT - no level shifters or glue logic - and supports MSB-first output with three leading zeros followed by 10 data bits and two sub-bits.

Conversion is initiated on CS falling edge; sampling occurs at aperture delay (10ns), acquisition completes within 468ns, and full 10-bit result is available after 15 SCLK rising edges (tCONV = 2.5µs at 6.4MHz). Shutdown mode reduces supply current to 2µA (typ), and wake-up delay depends on REF bypass capacitor discharge history.

Key Specifications

Pinout & Package

MAX1084AESA is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead(Pb)-free. Pin spacing is 1.27mm, body width 3.9mm, and total footprint 4.9mm × 6.0mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit serial ADC applications.

Compared with MAX1084BCSA+, MAX1084AESA delivers tighter DC accuracy and extended temperature qualification; compared with ADS7822U, it offers 2× higher throughput, lower reference drift (±15ppm/°C vs. ±25ppm/°C), and guaranteed monotonicity - making it preferable for industrial and medical designs demanding long-term stability and repeatability.

Availability

MAX1084AESA is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered instruments requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX1084AESA 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 MAX1084AESA belongs to Maxim's precision data acquisition ADC family, designed specifically for low-power, space-constrained systems needing integrated reference, robust serial interface, and guaranteed DC accuracy without external calibration.

FAQ

What is the maximum serial clock frequency supported by MAX1084AESA?

The MAX1084AESA supports a maximum SCLK frequency of 6.4MHz under specified conditions (50% duty cycle, VDD = +4.5V to +5.5V). At this rate, conversion time is 2.5µs (16 clock cycles), enabling the full 400ksps sampling rate. Exceeding 6.4MHz may violate setup/hold timing and cause data corruption on DOUT.

Does MAX1084AESA require external reference decoupling, and what value is recommended?

Yes, MAX1084AESA requires a 4.7µF capacitor connected between REF and GND. This capacitor stabilizes the internal +2.5V reference during conversion and shutdown transitions. Larger values increase wake-up delay after SHDN deassertion; smaller values risk reference ripple and degraded INL/DNL performance.

How does the shutdown mode affect the internal reference in MAX1084AESA?

In shutdown mode (SHDN = low), the internal reference is disabled and REF pin goes to high-impedance. The 4.7µF bypass capacitor discharges slowly, causing wake-up delay up to 1.4ms before the reference reaches regulation and conversions meet full accuracy specs. MAX1084AESA must not be commanded to convert until after this delay.

Can MAX1084AESA interface directly with an SPI master configured for CPOL = 0 and CPHA = 0?

Yes, MAX1084AESA is fully compatible with SPI masters using CPOL = 0 and CPHA = 0. Conversion starts on CS falling edge; DOUT becomes active low, then outputs 13 bits (3 leading zeros + 10 data bits + 2 sub-bits) on SCLK rising edges. Two byte reads (first byte: bits D9–D5; second byte: D4–D0 + sub-bits) reconstruct the full result.

What is the analog input voltage range specification for MAX1084AESA?

The MAX1084AESA analog input (AIN) accepts a unipolar 0V to VREF range, where VREF is the internal +2.5V reference (2.48V to 2.52V). Absolute maximum ratings allow AIN to swing from (GND – 0.3V) to (VDD + 0.3V) without damage, but full-scale conversion accuracy is only guaranteed within 0–2.5V.