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ADS1198 Datasheet(PDF) 39 Page - Texas Instruments

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Part # ADS1198
Description  ADS129x Low-Power, 8-Channel, 24-Bit Analog Front-End for Biopotential Measurements
PDF  110 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

ADS1198 Datasheet(HTML) 39 Page - Texas Instruments

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51k
51k
100k
100k
47nF
51k
100k
47nF
47nF
4-Bit
DAC
Skin,
Electrode Contact
Model
Patient
Protection
Resistor
AVDD
LOFF_SENSP
VLEAD_OFF_EN
AND
AVSS
LOFF_SENSN
VLEAD_OFF_EN
AND
LOFF_SENSP
VLEAD_OFF_EN
AND
LOFF_SENSN
VLEAD_OFF_EN
AND
RLD OUT
FLEAD_OFF[1:0]
Vx
3.3M
3.3M
3.3M
3.3M
3.3M
3.3M
Anti-Aliasing Filter
< 512kHz
FLEAD_OFF[1:0]
AVDD
AVSS
To ADC
LOFF_STATP
LOFF_STATN
COMP_TH[2:0]
V
INP
V
INN
(AVDD + AVSS)/2
7M
7M
10pF
10pF
PGA
EMI
Filter
12pF
12pF
Patient
ADS1294, ADS1294R, ADS1296, ADS1296R, ADS1298, ADS1298R
www.ti.com
SBAS459K – JANUARY 2010 – REVISED AUGUST 2015
9.3.1.7.4
Lead-Off Detection
Patient electrode impedances decay over time; therefore, these electrode connections must be continuously
monitored to verify that a suitable connection is present. The ADS129x lead-off detection functional block
provides significant flexibility to choose from various lead-off detection strategies. Although called lead-off
detection, this feature is in fact electrode-off detection.
The basic principle is to inject an excitation signal and measure the response to determine if the electrode is off.
As shown in the lead-off detection functional block diagram in Figure 39, this circuit provides two different
methods of determining the state of the patient electrode. The methods differ in the frequency content of the
excitation signal. Lead-off can be selectively done on a per channel basis using the LOFF_SENSP and
LOFF_SENSN registers. The internal excitation circuitry can be disabled while the sensing circuitry is enabled.
Figure 39. Lead-Off Detection
Copyright © 2010–2015, Texas Instruments Incorporated
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39
Product Folder Links: ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R



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