ADS1291IRSMT datasheet(64/83 Pages) TI2

64 / 83 page

2.2

7.2

12.2

Normalized Baseline Respiration Impedance (k

Ω)

PGA=2, PHASE = 135

PGA = 3, PHASE = 135

PGA = 2, PHASE = 157.5

PGA = 3, PHASE = 157.5

Data Rate = 125Hz

Respiration Modulation Clock = 64kHz

G059

2.2

5.2

8.2

11.2

14.2

Normalized Baseline Respiration Impedance (k

Ω)

PGA=3, PHASE = 112.5

PGA = 4, PHASE = 112.5

PGA = 3, PHASE = 135

PGA = 4, PHASE = 135

Data Rate = 125Hz

Respiration Modulation Clock = 32kHz

G058

40.2 kW

= 2.21 k

BASELINE

40.2 kW

IN1P

RESP_MODP

RESP_MODN

IN1N

ADS1292R

ADS1291, ADS1292, ADS1292R

SBAS502C – DECEMBER 2011 – REVISED APRIL 2020

www.ti.com

Product Folder Links: ADS1291 ADS1292 ADS1292R

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Typical Application (continued)

9.2.3 Application Curves

Figure 70 and Figure 71 show the results for the respiration test circuit of Figure 69 by plotting noise on channel

1 for the ADS1292R as baseline impedance, gain, and phase are swept. The x-axis is the baseline impedance,

normalized to a 30-µA modulation current (as shown in Equation 10).

Figure 69. Respiration Noise Test Circuit

Figure 70. Channel 1 Noise versus Impedance for 32-kHz

Modulation Clock and Phase

(BW = 32 Hz, Respiration Modulation Clock = 32 kHz)

Figure 71. Channel 1 Noise versus Impedance for 64-kHz Modulation Clock and Phase

(BW = 32 Hz, Respiration Modulation Clock = 64 kHz)

ADS1291IRSMT Datasheet(PDF) 64 Page - Texas Instruments

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