Datasheet

ADS1299
SBAS499A –JULY 2012–REVISED AUGUST 2012 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Minimum and maximum specifications apply from –40°C to +85°C. Typical specifications are at +25°C. All specifications are
at DVDD = 3.3 V, AVDD – AVSS = 5 V, V
REF
= 4.5 V, external f
CLK
= 2.048 MHz, data rate = 250 SPS, and gain = 12, unless
otherwise noted.
ADS1299
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
PATIENT BIAS AMPLIFIER
Integrated noise BW = 150 Hz 2 μV
RMS
GBP Gain bandwidth product 50 kΩ || 10 pF load, gain = 1 100 kHz
SR Slew rate 50 kΩ || 10 pF load, gain = 1 0.07 V/μs
THD Total harmonic distortion f
IN
= 10 Hz, gain = 1 –80 dB
CMIR Common-mode input range AVSS + 0.3 AVDD – 0.3 V
I
SC
Short-circuit current 1.1 mA
Quiescent power consumption 20 μA
LEAD-OFF DETECT
0, f
DR
/ 4
Continuous Hz
See Register Map section for settings
Frequency
One time or periodic 7.8, 31.2 Hz
ILEAD_OFF[1:0] = 00 6 nA
ILEAD_OFF[1:0] = 01 24 nA
Current
ILEAD_OFF[1:0] = 10 6 μA
ILEAD_OFF[1:0] = 11 24 μA
Current accuracy ±20 %
Comparator threshold accuracy ±30 mV
EXTERNAL REFERENCE
V
I(ref)
Reference input voltage 5-V supply, V
REF
= (VREFP – VREFN) 4.5 V
VREFN Negative input AVSS V
VREFP Positive input AVSS + 4.5 V
Input impedance 5.6 kΩ
INTERNAL REFERENCE
V
O
Output voltage 4.5 V
V
REF
accuracy ±0.2 %
Drift T
A
= –40°C to +85°C 35 ppm
Start-up time 150 ms
SYSTEM MONITORS
Analog supply 2 %
Reading error
Digital supply 2 %
From power-up to DRDY low 150 ms
Device wake up
STANDBY mode 31.25 µs
Voltage T
A
= +25°C 145 mV
Temperature
sensor reading
Coefficient 490 μV/°C
Signal frequency See Register Map section for settings Hz
f
CLK
/ 2
21
, f
CLK
/ 2
20
Test signal
Signal voltage See Register Map section for settings ±1, ±2 mV
Accuracy ±2 %
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