Installation Instructions

ADI Confidential
Rev. Sp0 | Page 12 of 20
Therefore, the impedance measurement is not valid while
the ECG measurement is ongoing.
Table 7. Electrical Specifications of the AD5940
Specification
Value (Typ)
Unit
Conductivity Range
0.2 to 20
µS (3%)
Accuracy at 0.2 µs
3
%
Accuracy at 1 µs
0.8
%
Accuracy at 10 µs
0.1
%
Accuracy at 20 µs
3
%
Resolution at 1 µs
1
nS
Resolution at 10 µs
2
nS
Excitation Frequency
100
Hz
Sampling Rate
30
SPS
SKIN AND AMBIENT TEMPERATURE
The skin temperature measurement is based on a
thermistor (NTCG104EF104FTDSX). The thermistor used in
the skin temperature measurement is thermally coupled to
the bottom of the watch. This thermistor is connected to one
of the analog inputs of the ADPD4100 and its performance
is heavily dependent on the mechanical connection that is
made to the body.
Table 8. Electrical Specifications of the Signal Chain
That Measures Skin Temperature
Specification
Value (Typ)
Temperature Range
−30°C to +50°C
Resolution at 25°C
TBD