Datasheet
ADS1293
SNAS602B –FEBRUARY 2013–REVISED MARCH 2013
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ELECTRICAL CHARACTERISTICS
(1)
(continued)
Unless otherwise noted, all limits are specified at T
A
= +25°C, +2.7V ≤ VDD ≤ +5.5V, +1.65V ≤ VDDIO ≤ MIN(+3.6V, VDD),
VREF = +2.4V, f
OSC
= 409.6kHz, 1µF low ESR capacitor between CVREF and GND, 0.1µF capacitor between RLDREF and
GND. Boldface limits apply for T
MIN
≤ T
A
≤ T
MAX
.
PARAMETER TEST CONDITIONS MIN
(2)
TYP
(3)
MAX
(2)
UNIT
ANALOG FRONT END
DIVR Differential Input Voltage Range –400 400 mV
Common-Mode Voltage Range for full VDD –
CMVR 0.95 V
DIVR 0.95
V
OS
Input-Referred Offset Voltage ±16 ±87 µV
CMRR Common-Mode Rejection Ratio 50 / 60Hz, VCM
DC
= RLDREF, VCM
AC
= 1.2V
PP
100 dB
0.1 - 215Hz, low power mode 23 30.5
0.1 - 215Hz, high resolution mode 15 23.95
Input-Referred Voltage Noise for
V
e
-ECG µV
PP
ECG
(4)
0.1 - 40Hz, low power mode 10 23.1
0.1 - 40Hz, high resolution mode 7 10.3
1 - 1280Hz, high resolution mode, double pace data
V
e
-PACE Input-Referred Voltage Noise for Pace 0.4 mV
PP
rate
0.1 - 215Hz, low power mode 240 315
N
e
Input-Referred Noise Density nV/√Hz
0.1 - 215Hz, high resolution mode 155 250
PSRR Power Supply Rejection Ratio 50 / 60Hz 94 dB
XTLK Crosstalk between channels Crosstalk from driven channel to zero input channel –105 dB
215Hz bandwidth, low power mode 17.4 17.8 bits
ENOB-
Effective Number of Bits for ECG
ECG
215Hz bandwidth, high resolution mode 17.8 18.4 bits
ENOB- 1280Hz bandwidth, high resolution mode, double
Effective Number of Bits for Pace 13.7 bits
PACE pace data rate
RS-ECG Sample Rate ECG Channel 25 6400 sps
See Table 5, Table 6, Table 7 and Table 8
RS-PACE Sample Rate PACE Channel 3.2 25.6 ksps
TSKEW Sample Time Skew Between Channels Multichip simultaneous sampling architecture 0 µs
INTERNAL REFERENCE (REF)
Internal Reference Voltage 2.4 V
Internal Reference Accuracy ±0.5%
V
REF
Internal Reference Drift ±11 ppm/°C
Internal Reference Start-up Time 5 ms
BATTERY MONITOR
Division (VDD-V
REF
)/factor 3.246 V/V
Division Accuracy ±0.25%
TEST REFERENCE
(V
REF
-VSS)/factor 12 V/V
Division Accuracy ±0.1%
Current Consumption 3.5 μA
(4) At least 1000 consecutive readings are used to calculate the peak-to-peak noise in production.
6 Copyright © 2013, Texas Instruments Incorporated
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