Datasheet

ADAS1000/ADAS1000-1/ADAS1000-2 Data Sheet
Rev. A | Page 6 of 80
Parameter Min Typ Max Unit Test Conditions/Comments
RIGHT LEG DRIVE/DRIVEN LEAD
(ADAS1000/ADAS1000-1 ONLY)
Output Voltage Range 0.2 AVDD − 0.2 V
RLD_OUT Short Circuit Current −5 ±2 +5 mA
External protection resistor required to meet
regulatory patient current limits; output shorted to
AVDD/AGND
Closed-Loop Gain Range
2
25 V/V
Slew Rate
2
200 mV/ms
Input Referred Noise
1
8 μV p-p 0.05 Hz to 150 Hz
Amplifier GBP
2
1.5 MHz
DC LEAD-OFF
Internal current source, pulls up open ECG pins;
programmable in 10 nA steps: 10 nA to 70 nA
Lead-Off Current Accuracy ±10 % Of programmed value
High Threshold Level
1
2.4 V
Inputs are compared to threshold levels; if inputs
exceed levels, lead-off flag is raised
Low Threshold Level
1
0.2 V
Threshold Accuracy 25 mV
AC LEAD-OFF
Programmable in 4 steps: 12.5 nA rms, 25 nA rms,
50 nA rms, 100 nA rms
Frequency Range
2.031
kHz
Fixed frequency
Lead-Off Current Accuracy ±10 % Of programmed value, measured into low impedance
REFIN
Input Range
2
1.76 1.8 1.84 V Channel gain scales directly with REFIN
Input Current 113 μA Per active ADC
450 675 950 μA 5 ECG channels and respiration enabled
REFOUT
On-chip reference voltage for ADC; not intended to
drive other components reference inputs directly,
must be buffered externally
Output Voltage, VREF 1.785 1.8 1.815 V
Reference Tempco
1
±10 ppm/°C
Output Impedance
2
0.1 Ω
Short Circuit Current
1
4.5 mA Short circuit to ground
Voltage Noise
1
33 μV p-p 0.05 Hz to 150 Hz (ECG band)
17 μV p-p 0.05 Hz to 5 Hz (respiration)
CALIBRATION DAC
Available on CAL_DAC_IO (output for master, input for
slave)
DAC Resolution 10 Bits
Full-Scale Output Voltage 2.64 2.7 2.76 V No load, nominal FS output is 1.5 × REFOUT
Zero-Scale Output Voltage 0.24 0.3 0.36 V No load
DNL −1 +1 LSB
Output Series Resistance
2
10 kΩ
Not intended to drive low impedance load, used for
slave CAL_DAC_IO configured as an input
Input Current ±5 nA When used as input
CALIBRATION DAC TEST TONE
Output Voltage 0.9 1 1.1 mV p-p Rides on common-mode voltage, VCM_REF = 1.3 V
Square Wave 1 Hz
Low Frequency Sine Wave 10 Hz
High Frequency Sine Wave 150 Hz
SHIELD DRIVER (ADAS1000/
ADAS1000-1 ONLY)
Output Voltage Range 0.3 2.3 V Rides on common-mode voltage, VCM
Gain 1 V/V
Offset Voltage −20 +20 mV
Short Circuit Current 15 25 μA Output current limited by internal series resistance
Stable Capacitive Load
2
10 nF
CRYSTAL OSCILLATOR Applied to XTAL1 and XTAL2
Frequency
2
8.192 MHz
Start-Up Time
2
15 ms Internal startup