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ADS1130 Datasheet(PDF) 6 Page - Texas Instruments |
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ADS1130 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 17 page Frequency(Hz) 0 -50 -100 -150 0 10 20 30 40 50 60 70 80 90 100 (a) Frequency(Hz) (b) -50 -100 -150 49 48 46 47 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 DataRate=10SPS DataRate=10SPS AVDD Z =500MW EFF (1) REFP REFN AVDD ESD Protection C BUF Frequency(kHz) 0 -20 -40 -60 -80 -100 -120 -140 -160 -180 -200 38.4 76.8 0 Z EFF + 1 (2)(76.8kHz)(13fF) + 500MW ADS1130 SBAS458A – JUNE 2009 – REVISED SEPTEMBER 2012 www.ti.com For the ADS1130: Figure 3. Frequency Response (1) fMOD = 76.8kHz. Figure 2. Simplified Reference Input Circuitry ESD diodes protect the reference inputs. To prevent these diodes from turning on, make sure the voltages on the reference pins do not go below GND by more than 100mV, and likewise, do not exceed AVDD by 100mV: GND – 100mV < (REFP or REFN) < AVDD + 100mV FREQUENCY RESPONSE The ADS1130 uses a sinc4 digital filter with the frequency response shown in Figure 3. The frequency response repeats at multiples of the modulator sampling frequency of 76.8kHz. The overall response is that of a low-pass filter with a –3dB cutoff frequency of 3.32Hz with the SPEED pin tied low (10SPS data rate) and 11.64Hz with the SPEED pin tied high (80SPS data rate). To help see the response at lower frequencies, Figure 4(a) illustrates the response out to 100Hz, when the data rate = 10SPS. Notice that signals at multiples of 10Hz are rejected, and therefore simultaneous rejection of 50Hz and 60Hz is achieved. The benefit of using a sinc4 filter is that every frequency notch has four zeros on the same location. This response, combined with the low-drift internal oscillator, provides an excellent normal-mode rejection of line-cycle interference. Figure 4(b) shows the same plot, but enlarges the Figure 4. Frequency Response Out To 100Hz view at the 50Hz and 60Hz notches with the SPEED pin tied low (10SPS data rate). 6 Submit Documentation Feedback Copyright © 2009–2012, Texas Instruments Incorporated Product Folder Links: ADS1130 |
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