Datasheet

ADS1294, ADS1294R
ADS1296, ADS1296R
ADS1298, ADS1298R
SBAS459I –JANUARY 2010–REVISED JANUARY 2012 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Minimum/maximum specifications apply for all commercial grade (0°C to +70°C) devices and from –40°C to +85°C for
industrial grades devices. Typical specifications are at +25°C. All specifications at DVDD = 1.8V, AVDD – AVSS = 3V
(1)
,
V
REF
= 2.4V, external f
CLK
= 2.048MHz, data rate = 500SPS, High-Resolution mode, and gain = 6, unless otherwise noted.
ADS1294, ADS1296, ADS1298
ADS1294R, ADS1296R, ADS1298R
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
CHANNEL PERFORMANCE (continued)
AC Performance
Common-mode rejection ratio (CMRR) f
CM
= 50Hz, 60Hz
(3)
–105 –115 dB
Power-supply rejection ratio (PSRR) f
PS
= 50Hz, 60Hz 90 dB
Crosstalk f
IN
= 50Hz, 60Hz –126 dB
Signal-to-noise ratio (SNR) f
IN
= 10Hz input, gain = 6 112 dB
10Hz, –0.5dBFs –98 dB
ADS1294R/6R/8R channel 1, 10Hz, –0.5dBFs –70 dB
100Hz, –0.5dBFs
(4)
–100 dB
Total harmonic distortion (THD)
ADS1294R/6R/8R channel 1,
–68 dB
100Hz, –0.5dBFs
(4)
ADS1294R/6R/8R channel 1,
–86 dB
100Hz, –20dBFs
(4)
DIGITAL FILTER
–3dB bandwidth 0.262f
DR
Hz
Digital filter settling Full setting 4 Conversions
RIGHT LEG DRIVE (RLD) AMPLIFIER AND PACE AMPLIFIERS
RLD integrated noise BW = 150Hz 7 μV
RMS
PACE integrated noise BW = 8kHz 20 µV
RMS
PACE amplifier crosstalk Crosstalk between PACE amplifiers 60 dB
Gain bandwidth product 50kΩ || 10pF load, gain = 1 100 kHz
Slew rate 50kΩ || 10pF load, gain = 1 0.25 V/μs
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
Peak swing (AVSS + 0.3V to AVDD + 0.3V)
50 μA
at AVDD = 3V
PACE and RLD current
Peak swing (AVSS + 0.3V to AVDD + 0.3V)
75 μA
at AVDD = 5V
PACE amplifier output resistance 100 Ω
Total harmonic distortion f
IN
= 100Hz, gain = 1 –70 dB
Common-mode input 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 CENTRAL TERMINAL (WCT) AMPLIFIER
Integrated noise BW = 150Hz See Table 5 nV/√Hz
Gain bandwidth product See Table 5 kHz
Slew rate See Table 5 V/s
Total harmonic distortion f
IN
= 100Hz 90 dB
Common-mode input range AVSS + 0.3 AVDD – 0.3 V
Short-circuit current Through internal 30kΩ resistor ±0.25 mA
Quiescent power consumption See Table 5 μA
(3) CMRR is measured with a common-mode signal of AVSS + 0.3V to AVDD – 0.3V. The values indicated are the maximum of the eight
channels.
(4) Harmonics above the second harmonic are attenuated by the digital filter.
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