Analog Devices Inc./Maxim Integrated MAX1037KEKA+T

Overview

MAX1037KEKA+T from Maxim Integrated is an 8-bit, 4-channel, low-power analog-to-digital converter with integrated track/hold, 2.048V internal reference, I²C-compatible 2-wire serial interface, and operation from a single 2.7V–3.6V supply. It delivers 188ksps sampling rate at 350µA, supports unipolar/bipolar and single-ended/pseudo-differential input configurations, and targets battery-powered sensor monitoring in portable medical instruments.

For engineers reviewing the MAX1037KEKA+T datasheet, MAX1037KEKA+T pinout, MAX1037KEKA+T application, or MAX1037KEKA+T equivalent, key selection criteria include its 8-pin SOT23 footprint, ±2 LSB total unadjusted error, AutoShutdown™ power management, 2.048V reference accuracy (±120 ppm/°C), and compatibility with I²C fast-mode (400kHz) and high-speed mode (1.7MHz).

Technical Context

The MAX1037KEKA+T employs successive-approximation architecture with on-chip track/hold capacitor and switched-capacitor DAC. Its analog input multiplexer routes up to four channels to a shared conversion core, configurable via software for single-ended (0–VREF) or pseudo-differential (±VREF/2) operation with programmable unipolar/bipolar output coding.

It integrates a 2.25MHz internal clock and supports external clocking; conversion timing is precisely defined-4.7µs with external clock, 6.1µs with internal clock-and includes dedicated FIFO and channel-scan mode for automated multi-channel acquisition without host intervention.

Key Specifications

Pinout & Package

MAX1037KEKA+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable electronics. The package features gull-wing leads, RoHS-compliant matte tin plating, and thermal pad-less construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MCP3221-AI/P, MAX1037KEKA+T uniquely combines integrated 2.048V reference, AutoShutdown™, and 8-pin SOT23 packaging-reducing component count, PCB area, and firmware overhead for ultra-low-power, space-constrained sensor nodes.

Availability

MAX1037KEKA+T is available at Aetrix Electronics and suitable for portable medical instruments, battery-powered environmental sensors, and handheld industrial test equipment requiring stable component supply and long-term production continuity.

Supply support for MAX1037KEKA+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX1036–MAX1039 family was engineered specifically for ultra-low-power, multi-channel data acquisition in size- and energy-constrained portable systems-emphasizing integrated references, minimal external components, and robust I²C interoperability.

FAQ

What is the absolute maximum input voltage range for MAX1037KEKA+T analog inputs?

The MAX1037KEKA+T analog inputs (AIN0–AIN3/REF) tolerate −0.3V to (VDD + 0.3V), but for accurate conversion, input voltage must stay within GND −50mV to VDD +50mV. Exceeding these limits risks measurement error or damage. With VDD = 3.6V and internal 2.048V reference, the valid unipolar input range is 0V to 2.048V; bipolar pseudo-differential range is ±1.024V referenced to the selected negative input.

Does MAX1037KEKA+T support true differential input mode?

No, MAX1037KEKA+T supports only pseudo-differential input mode. In this mode, only the '+' input (selected by CS[3:0]) is sampled by the track/hold circuit; the '−' input serves as a stable reference point and must remain within ±0.5LSB of GND during conversion. True differential sampling-where both inputs are actively tracked-is not implemented in the MAX1037KEKA+T architecture.

How does AutoShutdown™ reduce power consumption in MAX1037KEKA+T?

AutoShutdown™ automatically powers down the MAX1037KEKA+T conversion core and reference buffer between conversions, reducing supply current from 350µA (at 188ksps) to <1µA. This occurs without host intervention-triggered by idle I²C bus time-and resumes instantly upon next read command. It eliminates the need for manual power-gating firmware, simplifying low-power design for intermittent sensing applications.

Can MAX1037KEKA+T operate with an external reference voltage?

Yes, MAX1037KEKA+T accepts an external reference voltage from 1.0V to VDD applied to the AIN3/REF pin. When configured for external reference (SEL[2:1] = 00), the internal 2.048V reference is disabled. External referencing improves accuracy if a higher-precision or temperature-stable reference (e.g., REF3020) is used, but forfeits AutoShutdown™ benefits for the reference circuitry unless externally managed.

What is the minimum acquisition time required for accurate sampling with MAX1037KEKA+T?

The minimum acquisition time (tACQ) for MAX1037KEKA+T is 588ns under typical conditions (R_SOURCE ≤ 1.5kΩ). For higher source impedances, tACQ increases per tACQ ≥ 6.25(R_SOURCE + 2.5kΩ) × 18pF. At 188ksps with external clock, the inter-conversion interval is 5.32µs-providing ample margin for acquisition and conversion (4.7µs) in most designs without requiring external buffering.