Datasheet

ADS1294, ADS1294R
ADS1296, ADS1296R
ADS1298, ADS1298R
www.ti.com SBAS459I –JANUARY 2010–REVISED JANUARY 2012
ELECTRICAL CHARACTERISTICS
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
ANALOG INPUTS
Full-scale differential input voltage (AINP – AINN) ±V
REF
/GAIN V
See the Input Common-Mode Range
Input common-mode range subsection of the PGA Settings and Input
Range section
Input capacitance 20 pF
T
A
= +25°C, input = 1.5V ±200 pA
Input bias current T
A
= 0°C to +70°C, input = 1.5V ±1 nA
T
A
= –40°C to +85°C, input = 1.5V ±1.2 nA
No lead-off 1000 MΩ
DC input impedance Current source lead-off detection 500 MΩ
Pull-up resistor lead-off detection 10 MΩ
PGA PERFORMANCE
Gain settings 1, 2, 3, 4, 6, 8, 12
Bandwidth See Table 6
ADC PERFORMANCE
Data rates up to 8kSPS, no missing codes 24 Bits
Resolution 16kSPS data rate 19 Bits
32kSPS data rate 17 Bits
f
CLK
= 2.048MHz, High-Resolution mode 500 32000 SPS
Data rate
f
CLK
= 2.048MHz, Low-Power mode 250 16000 SPS
CHANNEL PERFORMANCE
DC Performance
Gain = 6
(2)
, 10 seconds of data 5 μV
PP
Gain = 6, 256 points, 0.5 seconds of data 4 7 μV
PP
Input-referred noise
Gain settings other than 6, data rates other
See Noise Measurements section
than 500SPS
Full-scale with gain = 6, best fit 8 ppm
Full-scale with gain = 6, best fit,
40 ppm
Integral nonlinearity ADS1294R/6R/8R channel 1
–20dBFS with gain = 6, best fit,
8 ppm
ADS1294R/6R/8R channel 1
Offset error ±500 µV
Offset error drift 2 µV/°C
Gain error Excluding voltage reference error ±0.2 ±0.5 % of FS
Gain drift Excluding voltage reference drift 5 ppm/°C
Gain match between channels 0.3 % of FS
(1) Performance is applicable for 5V operation as well. Production testing for limits is performed at 3V.
(2) Noise data measured in a 10-second interval. Test not performed in production. Input-referred noise is calculated with input shorted
(without electrode resistance) over a 10-second interval.
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Product Folder Link(s): ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R