Analog Devices Inc./Maxim Integrated MAX1189ACUI+

Overview

MAX1189ACUI+ from Maxim Integrated is a 16-bit, 135ksps successive-approximation ADC with ±10V bipolar analog input range, single +4.75V to +5.25V analog supply, and 16-bit parallel interface. It features ±2LSB INL, -100dB THD, and operates across 0°C to +70°C in a 28-pin TSSOP package - ideal for precision industrial process control and medical instrumentation requiring high DC accuracy and low distortion.

For engineers reviewing the MAX1189ACUI+ datasheet, MAX1189ACUI+ pinout, MAX1189ACUI+ application, or MAX1189ACUI+ equivalent, key selection criteria include its ±10V input range compatibility, internal +4.096V reference (±35ppm/°C tempco), 5.3mA analog supply current with external reference, AutoShutdown™ mode (5µA), and TSSOP-28 footprint suitability for space-constrained data-acquisition systems.

Technical Context

The MAX1189ACUI+ implements a SAR architecture with integrated track-and-hold, factory-trimmed internal clock, and input scaler enabling true ±10V bipolar operation from a single +5V analog supply. Its offset binary coding supports full-scale range of ±20V (FSR = +20V), with 1LSB = (FSR × VREF)/(65536 × 4.096).

Power management is controlled via R/C pin timing: second CS falling edge selects standby (reference/buffer active, 3.7mA) or shutdown (reference/buffer off, 0.5µA). Conversion completes in 4.7µs max after hold-mode initiation, with EOC signaling data readiness and three-state D0–D15 outputs synchronized to CS edges.

Key Specifications

Pinout & Package

MAX1189ACUI+ is housed in a 28-pin Thin Shrink Small Outline Package (TSSOP), 4.4mm × 9.7mm body, 0.65mm pitch, with exposed pad for thermal enhancement. Pin 1 marked via dot; recommended PCB layout uses separate AGND/DGND planes joined at single point near AVDD/DVDD decoupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8860IDRCT and AD7606BSTZ, the MAX1189ACUI+ uniquely combines native ±10V bipolar input, internal reference, 16-bit parallel interface, and 5µA shutdown - making it optimal for cost-sensitive, space-constrained, single-channel industrial DAQ where ease of analog interface and ultra-low idle power are critical.

Availability

MAX1189ACUI+ is available at Aetrix Electronics and suitable for industrial process control, precision instrumentation, and medical patient monitoring requiring stable component supply and long-term production continuity.

Supply support for MAX1189ACUI+ 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 MAX1189ACUI+ belongs to Maxim's high-accuracy SAR ADC product line, engineered specifically for battery-powered and space-constrained data-acquisition systems needing wide input range, low power, and minimal external components.

FAQ

What is the maximum sampling rate of the MAX1189ACUI+?

The MAX1189ACUI+ achieves a maximum sampling rate of 135ksps. This is specified under conditions of AVDD = DVDD = +5V ±5%, external reference = +4.096V, and CLOAD = 20pF. At this rate, the device consumes 5.3mA with external reference or 6.2mA with internal reference, and conversion time is guaranteed ≤4.7µs. The MAX1189ACUI+ maintains ±2LSB INL and -100dB THD performance across its full rated sampling range.

Does the MAX1189ACUI+ support ±10V analog input natively?

Yes, the MAX1189ACUI+ supports a native ±10V bipolar analog input range referenced to AGND. This is achieved via an internal input scaler that attenuates and shifts the signal to match the DAC range, eliminating the need for external op-amp level-shifting circuitry. The transfer function uses offset binary coding: 0x0000 = -10V, 0x8000 = 0V, 0xFFFF = +10V. Input resistance is 6kΩ in shutdown mode and 5.3mA supply current applies during active conversion.

How does the AutoShutdown™ feature work on the MAX1189ACUI+?

The AutoShutdown™ feature on the MAX1189ACUI+ is controlled by the R/C pin during the second falling edge of CS. Setting R/C high places the device in shutdown mode, powering down the internal reference and buffer to reduce total supply current to 5µA. Setting R/C low enters standby mode (3.7mA), keeping reference/buffer active for faster wake-up. After shutdown, 12ms is required for the internal reference to settle before achieving 16-bit accuracy - a timing constraint critical for low-duty-cycle applications.

What reference options does the MAX1189ACUI+ support?

The MAX1189ACUI+ supports both internal and external reference configurations. Its internal trimmed reference provides +4.096V at REF with ±35ppm/°C tempco and requires 10µF bypassing to AGND. For external reference, drive REF with a 3.8V–4.2V source capable of 100µA DC load and ≤10Ω output impedance; alternatively, use REFADJ as a buffered external reference input (5kΩ impedance), disabling the internal buffer by tying REFADJ to AVDD.

Is the MAX1189ACUI+ pin-compatible with other devices in the MAX1179/MAX1187/MAX1189 family?

Yes, the MAX1189ACUI+ is pin-compatible with MAX1179ACUI+ and MAX1187ACUI+ within the same TSSOP-28 package. All share identical pinout, timing, and interface logic. The primary differences lie in input range (±10V vs. ±5V vs. 0–10V) and minor INL grading (all ±2LSB for 'A' grade). Firmware and PCB layout can be reused across the family, allowing design flexibility for varying sensor interface requirements without hardware revision.