Datasheet

Data Sheet ADAS1000-3/ADAS1000-4
Rev. A | Page 5 of 76
Parameter Min Typ Max Unit Test Conditions/Comments
Gain Error −1 +0.01 +1 % GAIN 0 to GAIN 2, factory calibrated; programmable
user or factory calibration option enables; factory gain
calibration applies only to standard ECG interface
−2 +0.1 +2 % GAIN 3 setting, no factory calibration for this gain
Gain Matching −0.1 +0.02 +0.1 % GAIN 0 to GAIN 2
−0.5 +0.1 +0.5 % GAIN 3
Gain Tempco
1
25 ppm/°C
Input Referred Noise
1
GAIN 2, 2 kHz data rate, see Table 4
Analog Lead Mode 6 μV p-p 0.5 Hz to 40 Hz; high performance mode
10 μV p-p 0.05 Hz to 150 Hz; high performance mode
12 μV p-p 0.05 Hz to 150 Hz; low power mode
Electrode Mode 11 μV p-p 0.05 Hz to 150 Hz; high performance mode
12 μV p-p 0.05 Hz to 150 Hz; low power mode
Digital Lead Mode 14 μV p-p 0.05 Hz to 150 Hz; high performance mode
16 μV p-p 0.05 Hz to 150 Hz; low power mode
Power Supply Sensitivity
2
100 dB At 120 Hz
Analog Channel Bandwidth
1
65 kHz
Dynamic Range
1
104 dB GAIN 0, 2 kHz data rate, −0.5 dBFS input signal, 10 Hz
Signal-to-Noise Ratio
1
100 dB −0.5 dB FS input signal
COMMON-MODE INPUT CM_IN pin
Input Voltage Range 0.3 2.3 V
Input Impedance
2
1||10 GΩ||pF
Input Bias Current −40 ±1 +40 nA Over operating range; dc and ac lead-off disabled
−200 +200 nA AGND to AVDD
COMMON-MODE OUTPUT CM_OUT pin
VCM_REF 1.28 1.3 1.32 V Internal voltage; independent of supply
Output Voltage, VCM 0.3 1.3 2.3 V No dc load
Output Impedance
1
0.75 kΩ Not intended to drive current
Short-Circuit Current
1
4 mA
Electrode Summation
Weighting Error
2
1 % Resistor matching error
RESPIRATION FUNCTION
(ADAS1000-4 ONLY)
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)
Input Voltage Range 0.3 2.3 V AC-coupled, independent of supply
Input Voltage Range (Linear
Operation)
1.8/gain V p-p Programmable gain (10 states)
Input Bias Current −10 ±1 +10 nA Applies to EXT_RESP_xx pins over AGND to AVDD
Input Referred Noise
1
0.85 μV rms
Frequency
2
46.5 to 64 kHz
Programmable frequency, see Table 29
Excitation Current 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
64 μA p-p Drive Range A
32 μA p-p
Drive Range B
2
16 μA p-p
Drive Range C
2
8 μA p-p
Drive Range D
2
Resolution
2
24 Bits Update rate 125 Hz
Measurement Resolution
1
0.2 Ω Cable <5 kΩ/200 pF per electrode, body resistance
modeled as 1.2 kΩ
0.02 Ω No cable impedance, body resistance modeled as 1.2 kΩ
In-Amp Gain
1
1 to 10 Digitally programmable in steps of 1
Gain Error 1 % LSB weight for GAIN 0 setting
Gain Tempco
1
25 ppm/C