Обзор

Особенности и преимущества

Analog input
  • 800 kSPS, 16-bit precision ADC
  • Ultralow leakage, programmable switch matrix for custom sensor connections
  • High precision voltage, current, potentiostat, and impedance measurements
  • 6 external current measurement channels
  • Up to 24 voltage channels
  • Impedance measurement engine up to 200 kHz
  • ADC input path
    • Input buffers
    • Programmable TIA gain
    • Programmable gain amplifier with gain values of 1, 1.5, 2, 4, and 9
    • AAF
Voltage DACs
  • Dual output voltage DAC with an output range of 0.2 V to 2.4 V (±2.2V voltage potential to sensor)
  • 12-bit VBIAS output to bias Potentiostat amplifier
  • 6-bit VZERO output to bias TIA
  • Ultra low power:1 μA.
  • 1 high speed, 12-bit DAC
    • Output range: ±600 mV
    • Programmable gain amplifier on output with gain settings of 1 and 0.025
Amplifiers, accelerators, and references
  • 1 low power, low noise Potentiostat amplifier suitable for Potentiostat bias in electrochemical sensing
  • 1 low power, low noise TIA suitable for measuring sensor current output
    • Programmable load and gain resistors for sensor output
  • Analog hardware accelerators
    • Digital waveform generator
    • Receive filters
    • Complex impedance measurement (DFT) engine
  • 1 high speed TIA to handle wide bandwidth input signals up to 200 kHz
  • Digital waveform generator for generation of sinusoid and trapezoid waveforms
  • 2.5 V and 1.82 V internal reference voltage sources
System level power savings
  • Fast power-up and power-down analog blocks for duty cycling
  • Programmable AFE sequencer to minimize workload on host controller
  • 6 kB SRAM to preprogram AFE sequences
  • Ultra low power potentiostat channel: 6.5 μA when enabled
Smart sensor synchronization and data collection
  • Cycle accurate control of sensor measurement
  • Sequencer controlled GPIOs
On-chip peripherals
  • SPI serial input/output
  • Wake-up timer
  • Interrupt controller
Power
  • 2.8 V to 3.6 V supply
  • 1.8 V input/output compliant
  • POR
  • Hibernate mode with LPDAC and potentiostat powered up to maintain sensor bias
Package and temperature range
  • 3.6 mm × 4.2 mm, 56-ball WLCSP
  • Fully specified for −40°C to +85°C
Applications
  • Electrochemical measurements
  • Potentiostat/amperometric/voltammetry/cyclic voltammetry
  • Bioimpedance applications
    • Skin impedance
    • Body impedance
  • Continuous glucose monitoring
  • Battery impedance

Подробнее о продукте

The AD5940 is a high precision, low power analog front end (AFE) designed for portable applications requiring high precision, electrochemical-based measurement techniques, such as amperometric, voltametric, or impedance measurements. The AD5940 is designed for skin impedance and body impedance measurements, and is also designed to work with the AD8233 AFE in a complete bioelectric/biopotential measurement system.

The AD5940 consists of two high precision excitation loops and one common measurement channel, which enables a wide capability of measurements of the sensor under test. The first excitation loop consists of an ultra low power, dual output string digital-to-analog converter (DAC), and a low power, low noise potentiostat amplifier. One output of the DAC controls the noninverting input of the potentiostat amplifier, and the other output controls the noninverting input of the trans-impedance amplifier (TIA). This low power excitation loop is capable of generating signals from dc to 200 Hz.

The second excitation loop consists of a 12-bit DAC, referred to as the high speed DAC. This DAC is capable of generating high frequencies excitation signals up to 200 kHz.

The AD5940 measurement channel features a 16-bit, 800 kSPS, multichannel successive approximation register (SAR) analogto-digital converter (ADC) with input buffers, a built in antialias filter (AAF), and a programmable gain amplifier (PGA). The ADC features an input voltage range of ±1.35 V. An input mux before the ADC allows the user to select an input channel for measurement. These input channels include multiple external current inputs, multiple external voltage inputs, and internal voltage channels. The internal channels allow diagnostic measurements of the internal supply voltages, die temperature, and reference voltages.

The current inputs include two TIAs with programmable gain and load resistors for measuring different sensor types. The first TIA, referred to as LPTIA, is designed to measure low bandwidth signals. The second TIA, referred to as the high speed TIA, is designed to measure high bandwidth signals up to 200 kHz.

An ultralow leakage, low RON programmable switch matrix connects the sensor to the internal analog excitation and measurement blocks. This matrix provides an interface for connecting external TIA gain resistors and calibration resistors. The matrix can also be used to multiplex multiple electronic measurement devices to the same measurement electrodes.

A precision 1.82 V and 2.5 V on-chip reference source is available. The internal ADC and DAC circuits use this on-chip reference source to ensure low drift performance for these peripherals.

The AD5940 measurement blocks can be controlled via direct register writes through the SPI (Serial Peripheral Interface) interface, or, alternatively, by using a preprogrammable sequencer, which provides autonomous control of the AFE chip. 6 kB of static random access memory (SRAM) is partitioned for a deep data first in, first out (FIFO) and command memory.

Measurement commands are stored in the command memory and measurement results are stored in the data FIFO. A number of FIFO related interrupts are available to indicate state of the FIFO i.e. FIFO full, FIFO overflow.

8 general-purpose inputs/outputs (GPIOs) are available and can be controlled using the AFE sequencer, which allows cycle accurate control of multiple external sensor devices. The AD5940 operates from a 2.8 V to 3.6 V supply and is specified over a temperature range of −40°C to +85°C. The AD5940 is packaged in a 56-lead, 3.6 mm × 4.2 mm WLCSP package.

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Part#
ADC Configuration
MCU Core Technology
Clock MaxSpeeds Available
16-Bit, Current and Voltage inputs
ARM Cortex M3
26 MHz

Статус продукта icon-recommended Пререлиз

Данный продукт является новым. Возможны инженерные доработки. Количества для заказа могут быть ограничены. Технические характеристики могут меняться до тех пор, пока продукт не будет запущен в производство.

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Обсуждения

AD5940 Обсуждения

RE: ADICUP3029/AD5940 I2C issues
6 неделя (ль) назад в категории Ultra Low Power Microcontrollers
RE: ADICUP3029/AD5940 I2C issues
10 неделя (ль) назад в категории Ultra Low Power Microcontrollers
RE: ADICUP3029/AD5940 I2C issues
10 неделя (ль) назад в категории Ultra Low Power Microcontrollers
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