ADS1291_14 Datasheet, PDF (58/75 Pages) Texas Instruments – Power, 2-Channel, 24-Bit Analog Front-End for Biopotential Measurements

ADS1291
ADS1292
ADS1292R
SBAS502B – DECEMBER 2011 – REVISED SEPTEMBER 2012
www.ti.com
Internal Respiration Circuitry with External Clock (ADS1292R)
This mode is set by RESP_CTRL = 1. In this mode GPIO1 and GPIO2 are automatically configured as inputs.
GPIO1 and GPIO2 cannot be used for other purposes. The signals must be provided as described in Figure 55.
GPIO1
t_PHASE
(Modulation Clock)
GPIO2
t_BLKDLY
(Blocking Signal)
Figure 55. Internal Respiration (RESP_CTRL = 1) Timing Diagram
Table 16. Timing Characteristics for Figure 55⁽¹⁾
PARAMETER
t_PHASE
t_BLKDLY
DESCRIPTION
Respiration phase delay
Modulation clock rising edge to XOR signal
1.65 V ≤ DVDD ≤ 3.6 V
MIN
TYP
0
0
(1) Specifications apply from –40°C to +85°C.
MAX
168.75
5
UNIT
Degrees
ns
ADS1292R Application
The ADS1292R channel 1 with respiration enabled mode cannot be used to acquire ECG signals. If the right arm
(RA) and left arm (LA) leads are intended to measure respiration and ECG signals, the two leads can be wired
into channel 1 for respiration and channel 2 for ECG signals, as shown in Figure 56.
AVDD
AVSS
Left Arm Lead
R₆
10 MW
R₅
10 MW
C₂
0.1 mF
C₁
2.2 nF
C₃
2.2 nF
R₂
40.2 kW
IN1P
ADS1292R
RESP_MODP
IN2P
Right Arm Lead
AVDD
AVSS
C₆
0.1 mF
R₄
10 MW
R₃
10 MW
C₄
2.2 nF
C₅
2.2 nF
R₁
40.2 kW
IN2N
RESP_MODN
IN1N
NOTE: Patient and input protection circuitry not shown.
Figure 56. Typical Respiration Circuitry
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