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ADS1294 Datasheet(PDF) 72 Page - Texas Instruments

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Part # ADS1294
Description  Low-Power, 8-Channel, 24-Bit Analog Front-End for Biopotential Measurements
PDF  88 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

ADS1294 Datasheet(HTML) 72 Page - Texas Instruments

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GPIO3
GPIO4
GPIO2
t
BLKDLY
(DemodulationClock)
(Blocki g
n Si n l)
g a
t
PHASE
(ModulationCl ck)
o
Respiration
Modulation
Generator
RESP_PH[2:0]
CLK
(2.048MHz)
ModulationClock
DemodulationClock
GPIO4
GPIO3
GPIO2
ADS1294, ADS1294R
ADS1296, ADS1296R
ADS1298, ADS1298R
SBAS459H
– JANUARY 2010 – REVISED OCTOBER 2011
www.ti.com
External Respiration Circuitry Option (RESP_CTRL = 01b)
In this mode, GPIO2, GPIO3, and GPIO4 are automatically configured as outputs. The phase relationship
between the signals is shown in Figure 65. GPIO2 is the exclusive-OR of GPIO3 and GPIO4, as shown in
Figure 66. GPIO3 is the modulation signal, and GPIO4 is the de-modulation signal. While in this mode, the
general-purpose pin function of GPIO2, GPIO3, and GPIO4 is not available. The modulation frequency can be
64kHz or 32kHz using RESP_FREQ[2:0] bits in the CONFIG4 register. The remaining bit options of
RESP_FREQ[2:0] generate square waves on GPIO3 and GPIO4. The exclusive-OR out on GPIO2 is only
available on 64kHz and 32kHz modes. The phase of GPIO4, relative to GPIO3, is set by RESP_PH[2:0] bits in
the RESP register.
The mode can be used when the user implements custom respiration impedance circuitry external to the
ADS129x.
Figure 65. External Respiration (RESP_CTRL = 01b) Timing Diagram
Table 15. Timing Characteristics for Figure 65(1)
2.7V
≤ DVDD ≤ 3.6V
1.65V
≤ DVDD ≤ 2V
PARAMET
ER
DESCRIPTION
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
Respiration phase delay, set by
tPHASE
22.5
157.5
22.5
157.5
Degrees
RESP.RESP_PH[2:0] bits
Modulation clock rising edge to XOR
tBLKDLY
1
5
ns
signal
(1)
Specifications apply from
–40°C to +85°C.
Figure 66. External Respiration (RESP_CTRL = 01b) Block Diagram
72
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Copyright
© 2010–2011, Texas Instruments Incorporated
Product Folder Link(s): ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R



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