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www.ti.com SBAS459D – JANUARY 2010 – REVISED MAY 2010 ELECTRICAL CHARACTERISTICS 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 (1), V REF = 2.4V, external fCLK = 2.048MHz, data rate = 500SPS, high resolution mode, and gain = 6, unless otherwise noted. ADS1294, ADS1296, ADS1298 PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ANALOG INPUTS Full-scale differential input voltage ±VREF/GAIN V (AINP – AINN) See the Input Common-Mode Range subsection of Input common-mode range the PGA Settings and Input Range section Input capacitance 20 pF TA = +25°C, input = 1.5V ±200 pA Input bias current TA = 0°C to +70°C, input = 1.5V ±1 nA No lead-off 1000 M Ω DC input impedance Current source lead-off detection 500 M Ω Pull-up resistor lead-off detection 10 M Ω PGA PERFORMANCE Gain settings 1, 2, 3, 4, 6, 8, 12 Bandwidth See Table 6 ADC PERFORMANCE DR[2:0] = 011 to 110, no missing codes 24 Bits Resolution DR[2:0] = 001 19 Bits DR[2:0] = 000 17 Bits fCLK = 2.048MHz 500 32000 SPS Data rate fCLK = 2.048MHz, Low-Power mode 125 16000 SPS CHANNEL PERFORMANCE DC Performance Gain = 6(2), 10 seconds of data 5 mVPP Gain = 6, 256 points, 0.5 seconds of data 4 7 mVPP Input-referred noise Gain settings other than 6, data rate other See Noise Measurements section than 500SPS Integral nonlinearity Full-scale with gain = 6, best fit 8 ppm Offset error ±500 mV Offset error drift 2 mV/°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 AC Performance Common-mode rejection fCM = 50Hz, 60Hz (3) 105 115 dB Power-supply rejection fPS = 50Hz, 60Hz 90 dB Crosstalk fIN = 50Hz, 60Hz –126 dB Signal-to-noise ratio (SNR) fIN = 10Hz input, gain = 6 112 dB 10Hz, –0.5dBFs –98 dB Total harmonic distortion (THD) 100Hz, –0.5dBFs –100 dB (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. (3) CMRR is measured with a common-mode signal of AVSS + 0.3V to AVDD – 0.3V. The values indicated are the minimum of the eight channels. Copyright © 2010, Texas Instruments Incorporated 3 |
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