Low-power data acquisition system launched
Maxim Integrated Products
MAX1329, a low-power data acquisition system
Maxim Integrated Products has introduced the MAX1329, a low-power data acquisition system that integrates precision data convertors for signal conditioning and sensor excitation.
The MAX1329 features a 12-/16-bit analogue-to-digital converter (ADC), dual 12-bit force-sense digital-to-analogue converters (DACs), and voltage references.
The 12-bit ADC's 300ksps conversion rate is ideal 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 10 microsecond (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.
In addition to the ADC, DACs, and references, the MAX1329 integrates analogue support blocks ideal for portable data acquisition systems.
These analogue blocks 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.
An integrated oscillator provides a 32kHz clock for time-keeping, and a configurable frequency-locked loop (FLL) generates the high-speed clock necessary for driving a host microcontroller.
Other support features include dual voltage monitors, temperature measurement (internal and external temperature sensors), user-programmable general-purpose I/Os that can be used to output system interrupts, control switches, and drive shutdown.
The high integration of this device simplifies the design process, saves board space, and offers designers much greater flexibility in their selection of microcontrollers.
Optimised for battery-powered applications, the MAX1329 operates from a +1.8V to +3.6V digital supply and a +2.7V to +5.5V analogue supply.
Additionally, an on-chip charge pump provides a +5V supply up to 25mA to power other circuitry.
With all of the analogue 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 (-40C to +85C) and is available in a 6 x 6mm, 40-pin TQFN package.
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