Analog Devices Inc./Maxim Integrated MAX1177BCUP+T

Overview

The MAX1177BCUP+T from Maxim Integrated is a 16-bit, 135ksps successive-approximation ADC with 0V to +10V analog input range, single +4.75V to +5.25V analog supply, and byte-wide parallel interface. It features ±3 LSB INL, -100dB THD, and AutoShutdown™ reducing current to 0.5µA - optimized for high-accuracy industrial process control and precision instrumentation.

For engineers reviewing the MAX1177BCUP+T datasheet, MAX1177BCUP+T pinout, MAX1177BCUP+T application, or MAX1177BCUP+T equivalent, key selection criteria include its internal +4.096V reference (±35ppm/°C), dual-reference mode (internal/external), TSSOP-20 package, and support for +2.7V to +5.25V digital logic interfacing without level shifters.

Technical Context

The MAX1177BCUP+T employs a SAR architecture with integrated track-and-hold and factory-trimmed internal clock (4.7µs max conversion time). Its input scaler enables direct 0–10V measurement from a single +5V analog rail, eliminating external signal conditioning for many industrial sensors.

Power management is implemented via R/C-controlled standby (3.7mA typ) or shutdown (0.5µA typ) modes after conversion. Reference selection is flexible: internal buffered +4.096V (bypassed with 10µF/0.1µF) or external 3.8–4.2V source applied at REF or REFADJ, with REFADJ tied to AVDD to disable the internal buffer.

Key Specifications

Pinout & Package

MAX1177BCUP+T is housed in a 20-pin TSSOP (4.4mm body width, 0.65mm pitch), RoHS-compliant and moisture-sensitive level 1 (MSL1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS8860IDRCT and AD7682BRMZ, the MAX1177BCUP+T uniquely combines 0–10V direct input scaling, internal +4.096V reference, and byte-multiplexed parallel interface - making it optimal for cost-sensitive, µP-based industrial DAQ where minimizing external components and layout area is critical.

Availability

MAX1177BCUP+T is available at Aetrix Electronics and suitable for industrial process control, precision instrumentation, and battery-powered data-acquisition systems requiring stable component supply across extended temperature ranges (-40°C to +85°C).

Supply support for MAX1177BCUP+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 high-reliability ICs for industrial, medical, and communications infrastructure.

The MAX1177BCUP+T belongs to Maxim's high-accuracy data-acquisition ADC family, engineered specifically for applications demanding 16-bit resolution, low power, and simplified 0–10V sensor interfacing in harsh environments.

FAQ

What is the operating temperature range for the MAX1177BCUP+T?

The MAX1177BCUP+T is specified for the commercial temperature range of 0°C to +70°C. This is confirmed by the Ordering Information table in the datasheet, which lists MAX1177BCUP (the base part without +T suffix) as rated for 0°C to +70°C in the 20-pin TSSOP package. The +T suffix denotes tape-and-reel packaging but does not extend the temperature rating beyond the base part's specification.

Does the MAX1177BCUP+T require an external crystal or clock source?

No, the MAX1177BCUP+T does not require an external clock source. It features a factory-trimmed internal clock that drives the successive-approximation conversion process. The total conversion time is fixed at 4.7µs (max) after entering hold mode, eliminating timing dependencies on external oscillators or µP clocks - a key enabler for deterministic sampling in real-time control loops.

How does the MAX1177BCUP+T handle 0–10V analog inputs with a +5V supply?

The MAX1177BCUP+T uses an internal input scaler circuit (detailed in Figure 4 of the datasheet) consisting of precision resistors and switches to attenuate and level-shift the 0–10V input down to the internal DAC's 0–4.096V range. This allows full 16-bit resolution over the entire 0–10V span while operating from a single +5V analog supply - removing the need for external op-amps or negative supply rails.

Can the MAX1177BCUP+T interface directly with a 3.3V microcontroller?

Yes, the MAX1177BCUP+T can interface directly with a 3.3V microcontroller. Its DVDD pin accepts +2.7V to +5.25V, and its digital outputs (D0–D15, EOC) are specified for VOH ≥ DVDD – 0.4V and VOL ≤ 0.4V under 1.6mA sink conditions. With DVDD = 3.3V, outputs meet standard 3.3V CMOS logic thresholds, and inputs (CS, R/C, HBEN) accept VIH ≥ 0.7×DVDD and VIL ≤ 0.3×DVDD - ensuring robust interoperability.

What is the purpose of the REFADJ pin on the MAX1177BCUP+T?

The REFADJ pin on the MAX1177BCUP+T serves two functions: (1) As an output, it provides access to the internal reference buffer's node for fine-tuning the +4.096V reference voltage using external resistors (e.g., Figure 7 shows ±1.5% adjustment); (2) As an input, tying REFADJ to AVDD disables the internal buffer, enabling external reference injection at the REF pin. Its nominal 5kΩ input impedance allows precise current-sinking for calibration.