TI公司的ADS1298R是心電圖(ECG)前端解決方案,集成了8路同時取樣的24位Delta-Sigma模數(shù)轉(zhuǎn)換器(ADC)和內(nèi)置的可編增益放大器(PGA),基準(zhǔn)電壓以及振蕩器,具有心電圖(ECG)和腦電圖(EEG)所有的功能,每路的低功耗為0.75mW,輸入偏置電流200pA,數(shù)據(jù)速率250SPS到32kSPS,CMRR為-115dB,輸入?yún)⒖荚胍?μVPP (150Hz BW, G = 6),可編增益1, 2, 3, 4, 6, 8,或12,單電源2.7V-5.25V或雙電源1.65V-3.6V工作,主要用在醫(yī)療儀器(ECG,EEG和EMG),病人監(jiān)視,Holter等以及高精度多路信號同時取樣.本文介紹了ADS1298R主要特性,功能方框圖, 單電源和雙電源工作電路,以及ADS1298R ECG前端支持特性,方框圖,電路圖和材料清單(BOM).

The ADS1298R ECG FE is a reference design for the ADS1298R, a simultaneous sampling, 24-bit, delta-sigma (Δ Σ) analog-to-digital converter (ADC) with a built-in programmable gain amplifier (PGA), internal reference, and an onboard oscillator. The ADS1298R incorporates all of the features that are commonly required in medical electrocardiogram (ECG) and electroencephalogram (EEG) applications. The ADS1298R ECG FE can be used with a variety of patient simulators and allows the user to take advantage of the flexible input multiplexer which can be independently connected to the internally-generated signals for test, temperature, and lead-off detection. The ADS1298R also includes integrated Respiration Impedance measurement capability.

ADS1298R主要特性:

• Eight Low-Noise PGAs and Eight

High-Resolution ADCs (ADS1298, ADS1298R)

• Low Power: 0.75mW/channel.

• Input-Referred Noise: 4μVPP (150Hz BW, G = 6)

• Input Bias Current: 200pA

• Data Rate: 250SPS to 32kSPS

• CMRR: –115dB

• Programmable Gain: 1, 2, 3, 4, 6, 8, or 12.

• Unipolar or Bipolar Supplies:

AVDD = 2.7V to 5.25V, DVDD = 1.65V to 3.6V

• Built-In Right Leg Drive Amplifier, Lead-Off

Detection, WCT, PACE Detection, Test Signals

• Integrated Respiration Impedance

Measurement (ADS1294R/6R/8R only)

• Digital PACE Detection Capability

• Built-In Oscillator and Reference

• Flexible Power-Down, Standby Modes

• SPI™-Compatible Serial Interface

• Operating Temperature Range:–40℃ to +85℃

• Non-Magnetic BGA Package (ADS1294/6/8 and ADS1194/6/8)

ADS1298R應(yīng)用:

• Medical Instrumentation (ECG, EMG and EEG): Patient monitoring; Holter, event, stress, and vital signs including ECG, AED, telemedicine Bispectral index (BIS), Evoked audio potential (EAP), Sleep study monitor

• High-Precision, Simultaneous, Multichannel Signal Acquisition

圖1.ADS1298R功能方框圖

圖2.ADS1298R單電源工作電路

圖3.ADS1298R雙電源工作電路

ADS1298R ECG前端演示套件

ECG Front-End Performance Demonstration Kit

This user’s guide describes the characteristics, operation, and use of the ADS1298RECGFE-PDK. This evaluation module is an evaluation module for the ADS1298R, an eight-channel, 24-bit, low-power, integrated analog front-end (AFE) designed for patient monitoring and portable and high-end electrocardiogram (ECG) and electroencephalogram (EEG) applications. The ADS1298R is intended for prototyping and evaluation. This user’s guide includes a complete circuit description, schematic diagram, and bill of materials.

ADS1298R ECG前端演示套件支持特性:

Hardware Features:

• Configurable for bipolar or unipolar supply operation

• Configurable for internal and external clock and reference via jumper settings

• Configurable for ac- or dc-coupled inputs

• Configurable for up to 12 standard ECG leads

• External Right Leg Drive (RLD) Reference (VCC – VEE)/2

• External shield drive amplifier

• External Wilson central voltage

• Easy connectivity to popular ECG simulators

Software Features:

• Analysis tools including a virtual oscilloscope, histogram, FFT, and ECG display

• File printing for post-processing of raw ECG data

• Sets the ADS1298R register settings via easy-to-use graphic user interface (GUI) software

圖4.ADS1298R ECG前端演示套件外形圖

ADS1298R Kit包括:

The complete kit includes the following items:

• ADS1298R ECG FE printed circuit board (PCB), Rev A

• MMB0 (Modular EVM motherboard, Rev C or higher)

• Universal ac to dc wall adapter, 120V to 240V ac to +6V dc

圖5.ADS1298R ECG前端方框圖

圖6.ADS1298R ECG前端電路圖(1)

圖7.ADS1298R ECG前端電路圖(2)

圖8.ADS1298R ECG前端電路圖(3)

圖9.ADS1298R ECG前端電路圖(4)

圖10.ADS1298R ECG前端電路圖(5)

圖11.ADS1298R ECG前端PCB布局圖(頂層)
ADS1298R ECG前端材料清單(B)M):

詳情請見:
http://focus.ti.com/lit/ds/sbas459g/sbas459g.pdf
和
http://focus.ti.com/lit/ug/sbau181/sbau181.pdf