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ADAS1000-4BSTZ 数据表(PDF) 40 Page - Analog Devices

部件名 ADAS1000-4BSTZ
功能描述  Low Power, Three Electrode Electrocardiogram (ECG) Analog Front End
PDF  80 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADAS1000-4BSTZ 数据表(HTML) 40 Page - Analog Devices

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ADAS1000-3/ADAS1000-4
Data Sheet
Figure 69. Respiration Using External Capacitor and External Amplifiers
If required, further improvements in respiration performance
may be possible with the use of an instrumentation amplifier
and op amp external to the ADAS1000-4. The instrumentation
amplifier must have sufficiently low noise performance to meet
the target performance levels. This mode uses the external
capacitor mode configuration and is shown in Figure 69. Bit 14
of the RESPCTL register (Table 30) allows the user to bypass
the on-chip amplifier when using an external instrumentation
amplifier.
Respiration Carrier Frequency
The frequency of the respiration carrier is programmable and
can be varied through the RESPCTL register (Address 0x03, see
Table 30). The status of the HP bit in the ECGCTL register also
has an influence on the carrier frequency as shown in Table 13.
Table 13. Control of Respiration Carrier Frequencies
RESPALT-
FREQ1
RESPEXT-
SYNC1
HP2
RESP-
FREQ1
Respiration Carrier
Frequency
0
0
1
00
56
0
0
1
01
54
0
0
1
10
52
0
0
1
11
50
0
0
0
00
56
0
0
0
01
54
0
0
0
10
52
0
0
0
11
50
1
X3
1
00
64
1
X3
1
01
56.9
1
X3
1
10
51.2
1
X3
1
11
46.5
1
X3
0
00
32
1
X3
0
01
28
1
X3
0
10
25.5
1
X3
0
11
23
1
Control bits from RESPCTL (Register 0x03).
2
Control bit from ECGCTL (Register 0x01).
3
X = don’t care.
In applications where an external signal generator is used to
develop a respiration carrier signal, that external signal source
can be synchronized to the internal carrier using the signal
available on GPIO3 when Bit 7, RESPEXTSEL, is enabled in
the respiration control register (see Table 30).
Table 14. Control of Respiration Carrier Frequency
Available on GPIO3
RESPALT-
FREQ1
RESPEXT-
SYNC1
HP2
RESP-
FREQ1
Respiration Carrier
Frequency on GPIO3
0
1
X3
XX3
64
1
1
1
00
64
1
1
1
01
56
1
1
1
10
51.2
1
1
1
11
46.5
1
1
0
00
32
1
1
0
01
28
1
1
0
10
25.5
1
1
0
11
23
1
Control bits from RESPCTL (Register 0x03).
2
Control bit from ECGCTL (Register 0x01).
3
X = don’t care.
LA CABLE
50kHz TO
56kHz
46.5kHz TO
64kHz
OVERSAMPLED
1kΩ
10kΩ
10kΩ
10kΩ
10kΩ
1kΩ
100Ω
100Ω
RESPDAC_LA
RESPDAC_RA
1nF TO 10nF
1nF TO 10nF
RESPIRATION DAC
DRIVE + ve
CABLE AND ELECTRODE
IMPEDANCE < 1kΩ
RA CABLE
RESPIRATION
MEASURE
RESPIRATION DAC
DRIVE – ve
HPF
IN-AMP AND
ANTI-ALIASING
MAGNITUDE
AND
PHASE
SAR
ADC
EXT_RESP_LA
EXT_RESP_RA
REFOUT = 1.8V
0.9V
GAIN
1/2 OF
AD8606
1/2 OF
AD8606
ADAS1000-4
±1V
±1V
LPF
Rev. B | Page 40 of 80



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