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Data-acq system includes all analog circuitry for sensor excitation, MCU functions

Sunnyvale, Calif.—Maxim Integrated Products has developed a low-power data-acquisition system (DAS) that integrates precision data converters for signal conditioning and sensor excitation.

The MAX1329 features a 12-/16-bit analog-to-digital converter (ADC), dual 12-bit force-sense digital-to-analog converters (DACs), and voltage references. The 12-bit ADC's fast 300ksps conversion rate is well-suited for profiling fast-decaying transient signals, such as those from a blood glucose sensor. For greater resolution, internal dithering and digital signal processing extend the ADC's natural 12-bit resolution to 16-bits.

High-accuracy, internal 12-bit DACs (±2 LSB INL, ±1 DNL) with fast 10microsecond (max) settling times are also included for sensor excitation. These features support the intelligent microcontroller interface's seamless connection to a low-cost microcontroller, which completes the high-performance closed-looped system used in applications such as battery-powered/portable devices and data-acquisition systems.

For portable data acquisitions systems, the MAX1329 integrates analog support blocks, which include operational amplifiers, a 16:1 input multiplexer, a programmable-gain amplifier (PGA), and low-leakage single-pole/double-throw (SPDT) and single-pole/single-throw (SPST) solid-state switches. The 1V/V to 8V/V PGA provides a wide, dynamic measurement range to measure low-level signals.

Optimized for battery-powered applications, the MAX1329 operates from a +1.8V to +3.6V digital supply and a +2.7V to +5.5V analog supply. With all of the analog blocks enabled, the MAX1329 has a quiescent supply current of 3.75mA (typ). This drops to 0.5microamps (typ) in shutdown mode.

The MAX1329 is specified for the extended temperature range (-40°C to +85 °C) and is available in a 6mm x 6mm, 40-pin TQFN package.

Pricing: Starts at $7.49 (1000-up, FOB USA).
Datasheet: Click here.

Maxim Integrated Products, www.maxim-ic.com

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