ADAS1000-4BSTZ datasheet(5/80 Pages) AD

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Data Sheet

ADAS1000-3/ADAS1000-4

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. TA =

−40°C to +85°C, unless otherwise noted. Typical specifications are mean values at TA = 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, 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

GAIN 0 (gain setting ×1.4)

0.63

1.3

1.97

GAIN 1 (gain setting ×2.1)

0.8

1.3

1.8

GAIN 2 (gain setting ×2.8)

0.97

1.3

1.63

GAIN 3 (gain setting ×4.2)

Input Bias Current

−40

±1

+40

Relates to each electrode input; over operating range;

dc and ac lead-off are disabled

−200

+200

AGND to AVDD

Input Offset

−7

Electrode/vector mode with VCM = VCM_REF

GAIN 3

−7

GAIN 2

−15

GAIN 1

−22

GAIN 0

Input Offset Tempco1

±2

μV/°C

Input Amplifier Input

Impedance2

1||10

GΩ||pF

At 10 Hz

CMRR2

105

110

51 kΩ imbalance, 60 Hz with ±300 mV differential dc

offset; per AAMI/IEC standards; with driven leg loop

closed

Crosstalk1

Between channels

Resolution2

Bits

Electrode/vector mode, 2 kHz data rate, 24-bit data-word

Bits

Electrode/vector mode, 16 kHz data rate, 24-bit data-

word

Bits

Electrode/analog lead mode, 128 kHz data rate, 16-bit

data-word

Integral Nonlinearity Error

ppm

GAIN 0; all data rates

Differential Nonlinearity Error

ppm

GAIN 0

Gain2

Referred to input; (2 × VREF)/gain/(2N − 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

Rev. B | Page 5 of 80

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