ADAS1000-4BSTZ datasheet(7/80 Pages) AD

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Data Sheet

ADAS1000-3/ADAS1000-4

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

RIGHT LEG DRIVE/DRIVEN LEAD

Output Voltage Range

0.2

AVDD − 0.2

RLD_OUT Short-Circuit Current

−5

±2

External protection resistor required to meet

regulatory patient current limits; output shorted to

AVDD/AGND

Closed-Loop Gain Range2

V/V

Slew Rate2

200

mV/ms

Input Referred Noise1

μV p-p

0.05 Hz to 150 Hz

Amplifier GBP2

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 Level1

2.4

Inputs are compared to threshold levels; if inputs

exceed levels, lead-off flag is raised

Low Threshold Level1

0.2

Threshold Accuracy

AC LEAD-OFF

Programmable in 4 steps: 12.5 nA rms, 25 nA rms,

50 nA rms, 100 nA rms

Frequency Range

2.039

kHz

Fixed frequency

Lead-Off Current Accuracy

±10

Of programmed value, measured into low impedance

REFIN

Input Range2

1.76

1.8

1.84

Channel gain scales directly with REFIN

Input Current

113

μA

Per active ADC

450

675

950

μA

Three 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

Reference Tempco1

±10

ppm/°C

Output Impedance2

0.1

Short-Circuit Current1

4.5

Short circuit to ground

Voltage Noise1

μV p-p

0.05 Hz to 150 Hz (ECG band)

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

Bits

Full-Scale Output Voltage

2.64

2.7

2.76

No load, nominal FS output is 1.5 × REFOUT

Zero-Scale Output Voltage

0.24

0.3

0.36

No load

DNL

−1

LSB

Output Series Resistance2

kΩ

Not intended to drive low impedance load, used for

slave CAL_DAC_IO configured as an input

Input Current

±5

When used as an input

CALIBRATION DAC TEST TONE

Output Voltage

0.9

1.1

mV p-p

Rides on common-mode voltage, VCM_REF = 1.3 V

Square Wave

Low Frequency Sine Wave

High Frequency Sine Wave

150

SHIELD DRIVER

Output Voltage Range

0.3

2.3

Rides on common-mode voltage (VCM)

Gain

V/V

Offset Voltage

−20

+20

Short-Circuit Current

μA

Output current limited by internal series resistance

Stable Capacitive Load2

CRYSTAL OSCILLATOR

Applied to XTAL1 and XTAL2

Frequency2

8.192

MHz

Start-Up Time2

Internal startup

Rev. B | Page 7 of 80

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