Datasheet > AD5940BCBZ-RL7

AD5940BCBZ-RL7

更新时间： 2024-01-08 13:05:36

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
130页	1952K
描述
High Precision, Impedance, and Electrochemical Front End

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技术参数
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AD5940BCBZ-RL7 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	包装说明：	VFBGA,
针数：	56	Reach Compliance Code：	compliant
风险等级：	5.52	模拟集成电路 - 其他类型：	ANALOG CIRCUIT
JESD-30 代码：	R-PBGA-B56	长度：	4.16 mm
功能数量：	1	端子数量：	56
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	VFBGA
封装形状：	RECTANGULAR	封装形式：	GRID ARRAY, VERY THIN PROFILE, FINE PITCH
座面最大高度：	0.55 mm	最大供电电压 (Vsup)：	3.6 V
最小供电电压 (Vsup)：	2.8 V	标称供电电压 (Vsup)：	3.3 V
表面贴装：	YES	温度等级：	INDUSTRIAL
端子形式：	BALL	端子节距：	0.4 mm
端子位置：	BOTTOM	宽度：	3.56 mm
Base Number Matches：	1

AD5940BCBZ-RL7 数据手册

Data Sheet

AD5940

GENERAL DESCRIPTION

The AD5940 is a high precision, low power analog front end (AFE)

designed for portable applications that require high precision,

electrochemical-based measurement techniques, such as amper-

ometric, voltammetric, or impedance measurements. The

AD5940 is designed for skin impedance and body impedance

measurements, and works with the AD8233 AFE in a complete

bioelectric or biopotential measurement system. The AD5940 is

designed for electrochemical toxic gas sensing.

The current inputs include two TIAs with programmable gain

and load resistors for measuring different sensor types. The first

TIA, referred to as the low power TIA, measures low bandwidth

signals. The second TIA, referred to as the high speed TIA,

measures high bandwidth signals up to 200 kHz.

An ultralow leakage, programmable switch matrix connects the

sensor to the internal analog excitation and measurement blocks.

This matrix provides an interface for connecting external R_TIAs

and calibration resistors. The matrix can also be used to

multiplex multiple electronic measurement devices to the same

wearable electrodes.

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. One output of the DAC controls the noninverting

input of the potentiostat, and the other output controls the

noninverting input of the transimpedance amplifier (TIA). This

low power excitation loop is capable of generating signals from

dc to 200 Hz.

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 the 1.82 V and 2.5 V

peripherals.

The AD5940 measurement blocks can be controlled via direct

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 FIFO. Measurement

commands are stored in the command FIFO and measurement

results are stored in the data FIFO. A number of FIFO related

interrupts are available to indicate when the FIFO is full.

The second excitation loop consists of a 12-bit DAC, referred to

as the high speed DAC. This DAC is capable of generating high

frequency excitation signals up to 200 kHz.

The AD5940 measurement channel features a 16-bit, 800 kSPS,

multichannel successive approximation register (SAR) analog-

to-digital converter (ADC) with input buffers, a built in antialias

filter, and a programmable gain amplifier (PGA). An input mux

in front of the ADC allows the user to select an input channel

for measurement. These input channels include multiple

external current inputs, external voltage inputs, and internal

channels. The internal channels allow diagnostic measurements

of the internal supply voltages, die temperature, and reference

voltages.

A number of general-purpose inputs/outputs (GPIOs) are

available and are 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.

Rev. 0 | Page 5 of 130

1 2 3 456 7 8...130

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