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ADAS1000-3 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADAS1000-3
Beschreibung Three Electrode Electrocardiogram (ECG) Analog Front End
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 30 Seiten
ADAS1000-3 Datasheet, Funktion
Data Sheet
Low Power, Three Electrode
Electrocardiogram (ECG) Analog Front End
ADAS1000-3/ADAS1000-4
FEATURES
Biopotential signals in; digitized signals out
3 acquisition (ECG) channels and one driven lead
Can be ganged for 8 electrode + RLD using master
ADAS1000 or ADAS1000-1
AC and DC lead-off detection
Internal pace detection algorithm on 3 leads
Support for user’s own pace
Thoracic impedance measurement (internal/external path)
Selectable reference lead
Scalable noise vs. power control, power-down modes
Low power operation from
11 mW (1 lead), 15 mW (3 leads)
Lead or electrode data available
Supports AAMI EC11:1991/(R)2001/(R)2007, AAMI EC38
R2007, EC13:2002/(R)2007, IEC60601-1 ed. 3.0 b:2005,
IEC60601-2-25 ed. 2.0 :2011, IEC60601-2-27 ed. 2.0
b:2005, IEC60601-2-51 ed. 1.0 b: 2005
Fast overload recovery
Low or high speed data output rates
Serial interface SPI-/QSPI™-/DSP-compatible
56-lead LFCSP package (9 mm × 9 mm)
64-lead LQFP package (10 mm × 10 mm body size)
APPLICATIONS
ECG: monitor and diagnostic
Bedside patient monitoring, portable telemetry, Holter,
AED, cardiac defibrillators, ambulatory monitors, pace
maker programmer, patient transport, stress testing
GENERAL DESCRIPTION
The ADAS1000-3/ADAS1000-4 measure electro cardiac (ECG)
signals, thoracic impedance, pacing artifacts, and lead-on/off
status and output this information in the form of a data frame
supplying either lead/vector or electrode data at programmable
data rates. Its low power and small size make it suitable for
portable, battery-powered applications. The high performance
also makes it suitable for higher end diagnostic machines.
The ADAS1000-4 is a full-featured, 3-channel ECG including
respiration and pace detection, while the ADAS1000-3 offers
only ECG channels with no respiration or pace features.
The ADAS1000-3/ADAS1000-4 are designed to simplify
the task of acquiring and ensuring quality ECG signals.
They provide a low power, small data acquisition system for
biopotential applications. Auxiliary features that aid in better
quality ECG signal acquisition include: multichannel averaged
driven lead, selectable reference drive, fast overload recovery,
flexible respiration circuitry returning magnitude and phase
information, internal pace detection algorithm operating
on three leads, and the option of ac or dc lead-off detection.
Several digital output options ensure flexibility when monitor-
ing and analyzing signals. Value-added cardiac post processing
is executed externally on a DSP, microprocessor, or FPGA.
Because ECG systems span different applications, the
ADAS1000-3/ADAS1000-4 feature a power/noise scaling
architecture where the noise can be reduced at the expense
of increasing power consumption. Signal acquisition channels
may be shut down to save power. Data rates can be reduced to
save power.
To ease manufacturing tests and development as well as offer
holistic power-up testing, the ADAS1000-3/ADAS1000-4
offer a suite of features, such as dc and ac test excitation via
the calibration DAC and CRC redundancy testing in addition
to readback of all relevant register address space.
The input structure is a differential amplifier input thereby
allowing users a variety of configuration options to best suit
their application.
The ADAS1000-3/ADAS1000-4 are available in two package
options: either a 56-lead LFCSP or a 64-lead LQFP package;
they are specified over −40°C to +85°C temperature range.
Rev. B
Document Feedback
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Tel: 781.329.4700 ©2012–2015 Analog Devices, Inc. All rights reserved.
Technical Support
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ADAS1000-3 Datasheet, Funktion
ADAS1000-3/ADAS1000-4
Parameter
Gain Error
Min
−1
Gain Matching
Gain Tempco1
Input Referred Noise1
Analog Lead Mode
−2
−0.1
−0.5
Electrode Mode
Digital Lead Mode
Power Supply Sensitivity2
Analog Channel Bandwidth1
Dynamic Range1
Signal-to-Noise Ratio1
COMMON-MODE INPUT
Input Voltage Range
Input Impedance2
Input Bias Current
COMMON-MODE OUTPUT
VCM_REF
Output Voltage, VCM
Output Impedance1
Short-Circuit Current1
Electrode Summation
Weighting Error2
RESPIRATION FUNCTION
(ADAS1000-4 ONLY)
Input Voltage Range
Input Voltage Range (Linear
Operation)
Input Bias Current
Input Referred Noise1
Frequency2
Excitation Current
0.3
−40
−200
1.28
0.3
0.3
−10
Typ
+0.01
+0.1
+0.02
+0.1
25
6
10
12
11
12
14
16
100
65
104
100
1||10
±1
1.3
1.3
0.75
4
1
Max
+1
+2
+0.1
+0.5
2.3
+40
+200
1.32
2.3
1.8/gain
±1
0.85
46.5 to 64
2.3
+10
Resolution2
Measurement Resolution1
In-Amp Gain1
Gain Error
Gain Tempco1
64
32
16
8
24
0.2
0.02
1 to 10
25
1
Data Sheet
Unit
%
%
%
%
ppm/°C
μV p-p
μV p-p
μV p-p
μV p-p
μV p-p
μV p-p
μV p-p
dB
kHz
dB
dB
V
GΩ||pF
nA
nA
V
V
mA
%
V
V p-p
nA
μV rms
kHz
μA p-p
μA p-p
μA p-p
μA p-p
Bits
Ω
Ω
%
ppm/C
Test Conditions/Comments
GAIN 0 to GAIN 2, factory calibrated; programmable
user or factory calibration option enables; factory gain
calibration applies only to standard ECG interface
GAIN 3 setting, no factory calibration for this gain
GAIN 0 to GAIN 2
GAIN 3
GAIN 2, 2 kHz data rate, see Table 4
0.5 Hz to 40 Hz; high performance mode
0.05 Hz to 150 Hz; high performance mode
0.05 Hz to 150 Hz; low power mode
0.05 Hz to 150 Hz; high performance mode
0.05 Hz to 150 Hz; low power mode
0.05 Hz to 150 Hz; high performance mode
0.05 Hz to 150 Hz; low power mode
At 120 Hz
GAIN 0, 2 kHz data rate, −0.5 dBFS input signal, 10 Hz
−0.5 dB FS input signal
CM_IN pin
Over operating range; dc and ac lead-off disabled
AGND to AVDD
CM_OUT pin
Internal voltage; independent of supply
No dc load
Not intended to drive current
Resistor matching error
These specifications apply to the following pins:
EXT_RESP_LA, EXT_RESP_LL, EXT_RESP_RA and selected
internal respiration paths (Lead I, Lead II, Lead III)
AC-coupled, independent of supply
Programmable gain (10 states)
Applies to EXT_RESP_xx pins over AGND to AVDD
Programmable frequency, see Table 30
Respiration drive current corresponding to differential
voltage programmed by the RESPAMP bits in the
RESPCTL register; internal respiration mode, cable
5 kΩ/200 pF, 1.2 kΩ chest impedance
Drive Range A
Drive Range B2
Drive Range C2
Drive Range D2
Update rate 125 Hz
Cable <5 kΩ/200 pF per electrode, body resistance
modeled as 1.2 kΩ
No cable impedance, body resistance modeled as 1.2 kΩ
Digitally programmable in steps of 1
LSB weight for GAIN 0 setting
Rev. B | Page 6 of 80

6 Page









ADAS1000-3 pdf, datenblatt
ADAS1000-3/ADAS1000-4
Data Sheet
tDRDY_CS
DRDY
SCLK
tCSHA
CS
SDI
tCSSA
tCH
tCL
tCSHD
tCSSD
MSB
DB[31]
N
tDS
tDH
DB[30]
N
DB[29]
N
DB[25]
N
DB[24]
N
DB[23] DB[1]
LSB
tCSW
MSB
DB[31]
N+1
DB[30]
N+1
LSB
DB[1] DB[0]
N+1 N+1
SDO
tCSO
R/W ADDRESS = 0x40 (FRAMES)
DATA
DATA = NOP or 0x40
MSB
DB[31]
DRDY N – 1
DB[30]
N–1
DB[25] DB[24] DB[23] DB[1]
N–1 N–1 N–1 N–1
LSB
DB[0]
N–1
MSB
DB[31]
N
DB[30]
N
DB[1]
N
LSB
DB[0]
N
tDO
PREVIOUS DATA
HEADER (FIRST WORD OF FRAME)
Figure 3. Starting Read Frame Data (CPHA = 1, CPOL = 1)
SCLK
CS
SDI
SDO
tCH
tCSHA
tCSSA
tCL
tDS
MSB
DB[31]
tDH
DB[30]
DB[29]
DB[28]
DB[24]
DB[2]
tCSHD
tCSSD
DB[1]
LSB
DB[0]
tCSW
R/W
tDO
MSB
ADDRESS
DO_31
DO_30LAST DO_29LAST DO_28LAST
DATA
LSB
DO_1LAST DO_0LAST
tDO
Figure 4. Data Read and Write Timing Diagram (CPHA = 0, CPOL = 0)
Rev. B | Page 12 of 80

12 Page





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