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ADAS1000
(Rev.:RevA)

Low Power, Five Electrode Electrocardiogram (ECG) Analog Front End

Analog Devices 

Data Sheet

Parameter

Min

Gain Error

−1

−2

Gain Matching

−0.1

−0.5

Gain Tempco1

Input Referred Noise1

Analog Lead Mode

Electrode Mode

Digital Lead Mode

Power Supply Sensitivity2

Analog Channel Bandwidth1

Dynamic Range1

Signal-to-Noise Ratio1

COMMON-MODE INPUT

Input Voltage Range

Input Impedance2

Input Bias Current

COMMON-MODE OUTPUT

VCM_REF

Output Voltage, VCM

Output Impedance1

Short Circuit Current1

Electrode Summation

Weighting Error2

RESPIRATION FUNCTION

(ADAS1000 ONLY)

Input Voltage Range

Input Voltage Range (Linear

Operation)

Input Bias Current

Input Referred Noise1

Frequency2

Excitation Current

0.3

−40

−200

1.28

0.3

0.3

−10

Resolution2

Measurement Resolution1

In-Amp Gain1

Gain Error

Gain Tempco1

Typ

+0.01

+0.1

+0.02

+0.1

25

6

10

12

11

12

14

16

100

65

104

100

1||10

±1

1.3

1.3

0.75

4

1

Max

+1

+2

+0.1

+0.5

2.3

+40

+200

1.32

2.3

2.3

1.8/gain

±1

+10

0.85

46.5 to 64

64

32

16

8

24

0.2

0.02

1 to 10

1

25

ADAS1000/ADAS1000-1/ADAS1000-2

Unit

%

%

%

%

ppm/°C

μV p-p

μV p-p

μV p-p

μV p-p

μV p-p

μV p-p

μV p-p

dB

kHz

dB

dB

V

GΩ||pF

nA

nA

V

V

kΩ

mA

%

V

V p-p

nA

μV rms

kHz

μA p-p

μA p-p

μA p-p

μA p-p

bits

Ω

Ω

%

ppm/C

Test Conditions/Comments

GAIN 0 to GAIN 2, factory calibrated. Programmable

user or factory calibration option enables. Factory gain

calibration applies only to standard ECG interface.

GAIN 3 setting, no factory calibration for this gain

GAIN 0 to GAIN 2

GAIN 3

GAIN 2, 2 kHz data rate, see Table 4

0.5 Hz to 40 Hz; high performance mode

0.05 Hz to 150 Hz; high performance mode

0.05 Hz to 150 Hz; low power mode

0.05 Hz to 150 Hz; high performance mode

0.05 Hz to 150 Hz; low power mode

0.05 Hz to 150 Hz; high performance mode

0.05 Hz to 150 Hz; low power mode

At 120 Hz

GAIN 0, 2 kHz data rate, −0.5 dBFS input signal, 10 Hz

−0.5 dB FS input signal

CM_IN pin

Over operating range; dc and ac lead-off disabled

AGND to AVDD

CM_OUT pin

Internal voltage; independent of supply

No dc load

Not intended to drive current

Resistor matching error

These specifications apply to the following pins:

EXT_RESP_LA, EXT_RESP_LL, EXT_RESP_RA and selected

internal respiration paths (Lead I, Lead II, Lead III)

AC-coupled, independent of supply

Programmable gain (10 states)

Applies to EXT_RESP_xx pins over AGND to AVDD

Programmable frequency, see Table 28

Respiration drive current corresponding to differential

voltage programmed by RESPAMP bits in RESPCTL

register. Internal respiration mode, cable 5 kΩ/200 pF,

1.2 kΩ chest impedance

Drive Range A

Drive Range B2

Drive Range C2

Drive Range D2

Update rate 125 Hz

Cable <5 kΩ/200 pF per electrode, body resistance

modeled as 1.2 kΩ

No cable impedance, body resistance modeled as 1.2 kΩ

Digitally programmable in steps of 1

LSB weight for GAIN 0 setting

Rev. A | Page 5 of 80

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