Analog Devices Inc./Maxim Integrated MAX1066BCUP

Overview

The MAX1066BCUP from Maxim Integrated is a 14-bit, byte-wide parallel-output successive-approximation ADC optimized for low-power, high-accuracy data acquisition in space-constrained systems. It operates from a single 4.75V–5.25V analog supply and 2.7V–5.25V digital supply, delivers 165ksps sample rate, ±2 LSB INL (max), and consumes only 2.7mA with internal reference - ideal for battery-powered sensor interfaces and industrial I/O modules.

For engineers reviewing the MAX1066BCUP datasheet, MAX1066BCUP pinout, MAX1066BCUP application, or MAX1066BCUP equivalent, this page provides verified technical context, real-world timing behavior, byte-multiplexed interface constraints, and validated alternatives for embedded data-acquisition designs requiring stable 14-bit resolution at <3mA quiescent current.

Technical Context

The MAX1066BCUP implements a SAR architecture with integrated track-and-hold, factory-trimmed 4.096V internal reference (±35ppm/°C), and programmable power-down via R/C control during CS falling edges. Its byte-wide output uses HBEN to toggle between MSB and LSB on D0–D7, requiring two read cycles per conversion.

Timing is governed by internal clock generation: 4.7µs max conversion time after second CS fall, 1.1µs min acquisition time, and strict bus-relinquish timing (tBR = 80ns) to prevent data contention. Reference selection is hardware-configured via REFADJ connection to AVDD (external mode) or bypass capacitor (internal mode).

Key Specifications

Pinout & Package

MAX1066BCUP is housed in a 20-pin thin shrink small-outline package (TSSOP) with exposed pad, rated for 0°C to +70°C operation. Pin pitch is 0.65mm; body dimensions are 4.4mm × 6.5mm × 1.2mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-bit SAR ADC applications.

Compared with ADS8325IPW and AD7898ARZ-10, the MAX1066BCUP uniquely combines byte-wide parallel output, factory-trimmed internal reference, and AutoShutdown™ in a 20-pin TSSOP - enabling compact, low-power, self-contained 14-bit data acquisition without external support components.

Availability

MAX1066BCUP is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable data loggers, medical vital sign monitors, and test equipment requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MAX1066BCUP 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 MAX1065/MAX1066 product line was designed specifically for low-power, high-accuracy data acquisition in battery-operated and space-constrained systems - emphasizing integrated references, flexible power modes, and compact packaging.

FAQ

What is the maximum sample rate of the MAX1066BCUP, and under what conditions is it guaranteed?

The MAX1066BCUP achieves a guaranteed maximum sample rate of 165ksps when operating with AVDD = 4.75V–5.25V, DVDD = 2.7V–5.25V, and external reference = 4.096V. This rate is specified across the full 0°C to +70°C temperature range and includes all timing margins for acquisition (1.1µs), conversion (4.7µs), and bus relinquish (80ns). The MAX1066BCUP maintains this rate without performance derating in its specified commercial temperature grade.

How does the HBEN pin function in the MAX1066BCUP, and why is it essential for correct data reading?

The HBEN (High-Byte Enable) pin on the MAX1066BCUP controls whether the D0–D7 data bus presents the most significant byte (HBEN = high) or least significant byte (HBEN = low) of the 14-bit conversion result. Because the MAX1066BCUP uses a byte-wide interface, two consecutive reads - one with HBEN high, one with HBEN low - are required to reconstruct the full 14-bit word. Incorrect HBEN sequencing results in misaligned MSB/LSB data and invalid output codes.

Can the MAX1066BCUP operate with an external reference, and what are the voltage and drive requirements?

Yes, the MAX1066BCUP supports external reference operation by connecting REFADJ to AVDD to disable the internal buffer, then driving the REF pin directly. The external reference must supply 3.8V–5.25V with ≤10Ω output impedance and sustain ≥100µA DC load current during conversion. For optimal noise performance, the reference should be buffered and bypassed with a 1µF capacitor to AGND, as specified in the MAX1066BCUP datasheet.

What is the purpose of the R/C pin, and how does it affect power consumption in the MAX1066BCUP?

The R/C (Read/Convert) pin on the MAX1066BCUP determines power mode selection during the second falling edge of CS: R/C low enables standby mode (reference and buffer remain active, ~1mA current), while R/C high triggers shutdown mode (reference and buffer powered down, 0.5µA typical). This control allows dynamic trade-offs between wake-up latency (10ms for reference settling) and ultra-low quiescent current - critical for duty-cycled data acquisition using the MAX1066BCUP.

Does the MAX1066BCUP require a reset sequence after power-up, and how does RESET differ from the dummy conversion method?

The MAX1066BCUP does not require a reset after power-up if the internal reference has fully settled (≥10ms with CREFADJ = 0.1µF, CREF = 1µF). However, if exiting shutdown mode, a dummy conversion or synchronous RESET assertion (with CS high) ensures deterministic state initialization. Unlike dummy conversion - which consumes time and power - RESET provides immediate, hardware-controlled recovery to a known acquisition-ready state, making it preferable in time-critical MAX1066BCUP deployments.