Datasheet
R
10 MW
6
R
10 MW
5
C
2.2 nF
1
R
40.2 kW
2
C
0.1 Fm
2
C
2.2 nF
3
AVDD
AVSS
Left Arm Lead
RESP_MODP
IN1P
IN2P
Right Arm Lead
RESP_MODN
IN2N
R
40.2 kW
1
C
0.1 Fm
6
C
2.2 nF
4
C
2.2 nF
5
R
10 MW
4
R
10 MW
3
AVDD
AVSS
IN1N
ADS1292R
GPIO1
GPIO2
t
BLKDLY
(Blocking Signal)
t
PHASE
(Modulation Clock)
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.
Figure 55. Internal Respiration (RESP_CTRL = 1) Timing Diagram
Table 16. Timing Characteristics for Figure 55
(1)
1.65 V ≤ DVDD ≤ 3.6 V
PARAMETER DESCRIPTION MIN TYP MAX UNIT
t
PHASE
Respiration phase delay 0 168.75 Degrees
t
BLKDLY
Modulation clock rising edge to XOR signal 0 5 ns
(1) Specifications apply from –40°C to +85°C.
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.
NOTE: Patient and input protection circuitry not shown.
Figure 56. Typical Respiration Circuitry
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Product Folder Links: ADS1291 ADS1292 ADS1292R