Datasheet

ADAS1000/ADAS1000-1/ADAS1000-2 Data Sheet
Rev. A | Page 4 of 80
SPECIFICATIONS
AVDD = 3.3 V ± 5%, IOVDD = 1.65 V to 3.6 V, AGND = DGND = 0 V, REFIN tied to REFOUT, externally supplied crystal/clock =
8.192 MHz. Decoupling for reference and supplies as noted in the Power Supply, Grounding, and Decoupling Strategy section. T
A
=
−40°C to +85°C, unless otherwise noted. Typical specifications are mean values at T
A
= 25°C.
For specified performance, internal ADCVDD and DVDD linear regulators have been used. They may be supplied from external
regulators. ADCVDD = 1.8 V ± 5%, DVDD = 1.8 V ± 5%.
Front-end gain settings: GAIN 0 = ×1.4, GAIN 1 = ×2.1, GAIN 2 = ×2.8, GAIN 3 = ×4.2.
Table 2.
Parameter Min Typ Max Unit Test Conditions/Comments
ECG CHANNEL
These specifications apply to the following pins:
ECG1_LA, ECG2_LL, ECG3_RA, ECG4_V1, ECG5_V2,
CM_IN (CE mode), EXT_RESP_xx pins when used in
extend switch mode
Electrode Input Range Independent of supply
0.3 1.3 2.3 V GAIN 0 (gain setting ×1.4)
0.63 1.3 1.97 V GAIN 1 (gain setting ×2.1)
0.8 1.3 1.8 V GAIN 2 (gain setting ×2.8)
0.97 1.3 1.63 V GAIN 3 (gain setting ×4.2)
Input Bias Current −40 ±1 +40 nA
Relates to each electrode input; over operating range;
dc and ac lead-off are disabled
−200
+200
nA
AGND to AVDD
Input Offset
−7
mV
Electrode/vector mode with VCM = VCM_REF
GAIN 3
−7 mV GAIN 2
−15 mV GAIN 1
−22 mV GAIN 0
Input Offset Tempco
1
±2 μV/°C
Input Amplifier Input
Impedance
2
1||10 GΩ||pF At 10 Hz
CMRR
2
105 110 dB
51 kΩ imbalance, 60 Hz with ±300 mV differential dc
offset; per AAMI/IEC standards; with driven leg loop
closed
Crosstalk
1
80 dB Between channels
Resolution
2
19 Bits Electrode/vector mode, 2 kHz data rate, 24-bit data-word
18 Bits
Electrode/vector mode, 16 kHz data rate, 24-bit data-
word
16 Bits
Electrode/analog lead mode, 128 kHz data rate, 16-bit
data-word
Integral Nonlinearity Error 30 ppm GAIN 0; all data rates
Differential Nonlinearity Error 5 ppm GAIN 0
Gain
2
Referred to input. (2 × VREF)/Gain/(2
N
− 1). Applies
after factory calibration. User calibration adjusts this
number.
GAIN 0 (×1.4)
4.9
µV/LSB
At 19-bit level in 2 kHz data rate
9.81 μV/LSB At 18-bit level in 16 kHz data rate
39.24 μV/LSB At 16-bit level in 128 kHz data rate
GAIN 1 (×2.1) 3.27 μV/LSB At 19-bit level in 2 kHz data rate
6.54 μV/LSB At 18-bit level in 16 kHz data rate
26.15 μV/LSB At 16-bit level in 128 kHz data rate
GAIN 2 (×2.8) 2.45 μV/LSB At 19-bit level in 2 kHz data rate
4.9 μV/LSB At 18-bit level in 16 kHz data rate
19.62 μV/LSB At 16-bit level in 128 kHz data rate
GAIN 3 (×4.2) 1.63 μV/LSB No factory calibration for this gain setting
At 19-bit level in 2 kHz data rate
3.27 μV/LSB At 18-bit level in 16 kHz data rate
13.08 μV/LSB At 16-bit level in 128 kHz data rate