Datasheet

ADS1194, ADS1196
ADS1198
SBAS471C –APRIL 2010– REVISED NOVEMBER 2011 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Minimum/maximum specifications apply from 0°C to +70°C. Typical specifications are at +25°C.
All specifications at DVDD = 1.8V, AVDD – AVSS = 3V, V
REF
= 2.4V, external f
CLK
= 2.048MHz, data rate = 500SPS, and
gain = 6, unless otherwise noted.
ADS1194, ADS1196, ADS1198
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
RIGHT LEG DRIVE (RLD) AMPLIFIER AND PACE AMPLIFIERS
RLD integrated noise BW = 150Hz 8 µV
rms
RLD Gain bandwidth product 50kΩ || 10pF load, gain = 1 100 kHz
Pace noise BW = 8kHz 20 µV
rms
Pace Gain bandwidth product 50kΩ || 10pF load, PGA gain = 1 80 kHz
RLD Slew rate 50kΩ || 10pF load, gain = 1 0.2 V/µs
Pace Slew rate 50kΩ || 10pF load, PGA gain = 1 0.04 V/µs
Pace amplifier crosstalk Crosstalk between Pace amplifiers 60 dB
Pace amplifier output resistance 100 Ω
AVDD = 3V 50 µA
Maximum Pace and RLD current
AVDD = 5V 75 µA
Short-circuit to GND (AVDD = 3V) 270 µA
Short-circuit to supply (AVDD = 3V) 550 µA
Pace and RLD amplifier drive strength
Short-circuit to GND (AVDD = 5V) 490 µA
Short-circuit to supply (AVDD = 5V) 810 µA
Total harmonic distortion 60Hz, –0.5dBFS –70 dB
Common-mode range AVSS + 0.7 AVDD – 0.3 V
Common-mode resistor matching Internal 200kΩ resistor matching 0.1 %
Short-circuit current ±0.25 mA
Quiescent power consumption Either RLD or Pace amplifier 20 μA
WILSON CENTER TERMINAL (WCT) AMPLIFIER
Input voltage noise density See Table 3 µV
RMS
Gain bandwidth product See Table 3 kHz
Slew rate See Table 3 V/s
Total harmonic distortion f
IN
= 100Hz 90 dB
Common-mode range AVSS + 0.3 AVDD – 0.3 V
Quiescent power consumption See Table 3 μA
LEAD-OFF DETECT
Frequency See Register Map section for settings 0, f
DR
/4 kHz
Current See Register Map section for settings 4, 8, 12, 16 nA
Current accuracy ±20 %
Comparator threshold accuracy ±30 mV
EXTERNAL REFERENCE
3V supply V
REF
= (VREFP – VREFN) 2.5 V
Reference input voltage
5V supply V
REF
= (VREFP – VREFN) 4.1 V
Negative input (VREFN) AVSS V
Positive input (VREFP) AVSS + 2.5 V
Input impedance 10 kΩ
INTERNAL REFERENCE
Register bit CONFIG3.VREF_4V = 0,
2.4 V
AVDD ≥ 2.7V
Output voltage
Register bit CONFIG3.VREF_4V = 1,
4.0 V
AVDD ≥ 4.4V
V
REF
accuracy ±0.2 %
Drift 35 ppm/°C
Start-up time 150 ms
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Product Folder Link(s): ADS1194 ADS1196 ADS1198