ADS1294 datasheet(71/88 Pages) TI

71 / 88 page

ADS1294, ADS1294R

ADS1296, ADS1296R

ADS1298, ADS1298R

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SBAS459H

– JANUARY 2010 – REVISED OCTOBER 2011

RESPIRATION

The ADS1294R/6R/8R provide three modes for respiration impedance measurement: external respiration,

internal respiration using on-chip modulation signals, and internal respiration using user-generated modulation

signals, as shown in Table 14.

Table 14. Respiration Control

RESP.RESP_CTRL[1]

RESP.RESP_CTRL[0]

MODE AVAILABLE

DESCRIPTION

ADS1294, ADS1296, ADS1298,

Respiration disabled

ADS1294R, ADS1296R, ADS1298R

Generates modulation and demodulation signals for external

ADS1294, ADS1296, ADS1298,

respiration circuitry. RESP CLK signals on GPIO2, GPIO3, and

ADS1294R, ADS1296R, ADS1298R

GPIO4.

Respiration measurement using internally-generated

ADS1294R, ADS1296R, ADS1298R

RESP_MOD signals.

ADS1294R, ADS1296R,

Respiration measurement using user-generated modulation and

ADS1298R(1)

blocking signal.

For more information on respiration impedance measurement, refer to application note Respiration Rate

Measurement Using Impedance Pneumography (SBAA181).

(1)

RESP_CTRL[1:0] = 11 is not recommend if CLKSEL = 1 (internal master clock).

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ADS1294 Datasheet(PDF) 71 Page - Texas Instruments