TI公司的ADS1298R是心电图(ECG)前端解决方案,集成了8路同时取样的24位Delta-Sigma模数转换器(ADC)和内置的可编增益放大器(PGA),基准电压以及振荡器,具有心电图(ECG)和脑电图(EEG)所有的功能,每路的低功耗为0.75mW,输入偏置电流200pA,数据速率250SPS到32kSPS,CMRR为-115dB,输入参考噪音4μVPP (150Hz BW, G = 6),可编增益1, 2, 3, 4, 6, 8,或12,单电源2.7V-5.25V或双电源1.65V-3.6V工作,主要用在医疗仪器(ECG,EEG和EMG),病人监视,Holter等以及高精度多路信号同时取样.本文介绍了ADS1298R主要特性,功能方框图, 单电源和双电源工作电路,以及ADS1298R ECG前端支持特性,方框图,电路图和材料清单(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应用:

• 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

图1.ADS1298R功能方框图

图2.ADS1298R单电源工作电路

图3.ADS1298R双电源工作电路

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

图4.ADS1298R ECG前端演示套件外形图

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

图5.ADS1298R ECG前端方框图

图6.ADS1298R ECG前端电路图(1)

图7.ADS1298R ECG前端电路图(2)

图8.ADS1298R ECG前端电路图(3)

图9.ADS1298R ECG前端电路图(4)

图10.ADS1298R ECG前端电路图(5)

图11.ADS1298R ECG前端PCB布局图(顶层)
ADS1298R ECG前端材料清单(B)M):

详情请见:
http://focus.ti.com/lit/ds/sbas459g/sbas459g.pdf
和
http://focus.ti.com/lit/ug/sbau181/sbau181.pdf