SBASB74 October 2024 ADS127L21B
PRODUCTION DATA
The ADC provides four operational speed modes that provide trade-offs between ADC resolution, power consumption, and signal bandwidth. The modes are max speed, high speed, mid speed, and low speed, with decreasing orders of device power consumption. The wideband filter offers data rates up to 512kSPS (max-speed mode), 400kSPS (high-speed mode), 200kSPS (mid-speed mode), and 50kSPS (low-speed mode). Data are also accessible from the partial filters of the intermediate FIR1 or FIR2 stages for reduced filter time latency.
The low-latency sinc4 filter offers data rates up to 1.365MSPS (max-speed mode), 1.066MSPS (high-speed mode), 533kSPS (mid-speed mode), and 133kSPS (low-speed mode).
The programmable oversampling ratio (OSR) determines the output data rate and signal bandwidth, therefore affecting total noise performance. Increasing the OSR lowers the signal bandwidth and total noise by averaging more samples from the modulator to yield one conversion result.
Table 7-12 through Table 6-5 summarize the noise performance of the filters. Noise performance is specified for the 1x input range and a 4.096V reference voltage. In comparison, decreasing the reference voltage to 2.5V decreases dynamic range by 4dB (typical). 2.5V reference voltage and 2x input range operation decreases dynamic range by 3dB (typical) compared to a 4.096V reference voltage and 1x input range operation.
Noise data are the result of the standard deviation (rms) of the conversion data with inputs shorted and biased to the mid-supply voltage. Noise data are representative of typical performance at TA = 25°C. A minimum of 1,000 or 10 seconds of consecutive conversions (whichever occurs first) are used to measure RMS noise (en). Because of the statistical nature of noise, repeated noise measurements potentially yield higher or lower noise results.
Equation 13 converts RMS noise to dynamic range. Equation 25 converts RMS noise to effective resolution.
where:
When evaluating ADC noise performance, consider the effect of the external buffer and amplifier noise to the total noise performance. The noise performance of the ADC is evaluated in isolation of the amplifiers by selecting the input short test connection of the input multiplexer.
MODE | fCLK (MHz) | OSR | DATA RATE (kSPS) | NOISE (en, µVRMS) | DYNAMIC RANGE (dB) | EFFECTIVE RESOLUTION (Bits) |
---|---|---|---|---|---|---|
Max speed | 32.768 | 32 | 512 | 11.1 | 108.3 | 19.5 |
High speed | 25.6 | 400 | 10.9 | 108.5 | 19.5 | |
Mid speed | 12.8 | 200 | 10.6 | 108.7 | 19.6 | |
Low speed | 3.2 | 50 | 10.4 | 108.9 | 19.6 | |
Max speed | 32.768 | 64 | 256 | 7.64 | 111.6 | 20.0 |
High speed | 25.6 | 200 | 7.50 | 111.7 | 20.1 | |
Mid speed | 12.8 | 100 | 7.30 | 112.0 | 20.1 | |
Low speed | 3.2 | 25 | 7.14 | 112.2 | 20.1 | |
Max speed | 32.768 | 128 | 128 | 5.34 | 114.7 | 20.5 |
High speed | 25.6 | 100 | 5.25 | 114.8 | 20.6 | |
Mid speed | 12.8 | 50 | 5.07 | 115.1 | 20.6 | |
Low speed | 3.2 | 12.5 | 4.97 | 115.3 | 20.7 | |
Max speed | 32.768 | 256 | 64 | 3.79 | 117.7 | 21.0 |
High speed | 25.6 | 50 | 3.72 | 117.8 | 21.1 | |
Mid speed | 12.8 | 25 | 3.58 | 118.2 | 21.1 | |
Low speed | 3.2 | 6.25 | 3.53 | 118.3 | 21.1 | |
Max speed | 32.768 | 512 | 32 | 2.71 | 120.6 | 21.5 |
High speed | 25.6 | 25 | 2.67 | 120.7 | 21.5 | |
Mid speed | 12.8 | 12.5 | 2.54 | 121.2 | 21.6 | |
Low speed | 3.2 | 3.125 | 2.47 | 121.4 | 21.7 | |
Max speed | 32.768 | 1024 | 16 | 1.88 | 123.8 | 22.1 |
High speed | 25.6 | 12.5 | 1.87 | 123.8 | 22.1 | |
Mid speed | 12.8 | 6.25 | 1.82 | 124.0 | 22.1 | |
Low speed | 3.2 | 1.5625 | 1.76 | 124.3 | 22.2 | |
Max speed | 32.768 | 2048 | 8 | 1.34 | 126.7 | 22.5 |
High speed | 25.6 | 6.25 | 1.32 | 126.8 | 22.5 | |
Mid speed | 12.8 | 3.125 | 1.29 | 127.0 | 22.6 | |
Low speed | 3.2 | 0.78125 | 1.25 | 127.3 | 22.6 | |
Max speed | 32.768 | 4096 | 4 | 0.96 | 129.6 | 23.0 |
High speed | 25.6 | 3.125 | 0.95 | 129.7 | 23.0 | |
Mid speed | 12.8 | 1.5625 | 0.93 | 129.9 | 23.1 | |
Low speed | 3.2 | 0.390625 | 0.89 | 130.3 | 23.1 |
MODE | fCLK (MHz) | OSR | DATA RATE (kSPS) | NOISE (en, µVRMS)(1) | DYNAMIC RANGE (dB) | EFFECTIVE RESOLUTION (Bits) | |||
---|---|---|---|---|---|---|---|---|---|
SINC3 | SINC4 | SINC3 | SINC4 | SINC3 | SINC4 | ||||
Max speed | 32.768 | 12 | 1365.3 | 239 | 66.8 | 81.7 | 92.7 | 15.1 | 16.9 |
High speed | 25.6 | 1066.6 | 235 | 66.6 | 81.8 | 92.8 | 15.1 | 16.9 | |
Mid speed | 12.8 | 533.3 | 235 | 63.8 | 81.8 | 93.1 | 15.1 | 17.0 | |
Low speed | 3.2 | 133.33 | 232 | 63.1 | 81.9 | 93.2 | 15.1 | 17.0 | |
Max speed | 32.768 | 16 | 1024 | 99.9 | 24.8 | 89.2 | 101.3 | 16.3 | 18.3 |
High speed | 25.6 | 800 | 99.6 | 24.5 | 89.3 | 101.5 | 16.3 | 18.4 | |
Mid speed | 12.8 | 400 | 98.9 | 24.5 | 89.3 | 101.5 | 16.3 | 18.4 | |
Low speed | 3.2 | 100 | 96.0 | 24.3 | 89.6 | 101.5 | 16.4 | 18.4 | |
Max speed | 32.768 | 24 | 682.67 | 31.1 | 10.8 | 99.4 | 108.6 | 18.0 | 19.5 |
High speed | 25.6 | 533.3 | 31.0 | 10.3 | 99.4 | 108.9 | 18.0 | 19.6 | |
Mid speed | 12.8 | 266.67 | 30.8 | 10.1 | 99.5 | 109.2 | 18.0 | 19.6 | |
Low speed | 3.2 | 66.67 | 30.7 | 9.96 | 99.5 | 109.3 | 18.0 | 19.6 | |
Max speed | 32.768 | 32 | 512 | 15.2 | 8.24 | 105.6 | 110.9 | 19.0 | 19.9 |
High speed | 25.6 | 400 | 15.0 | 8.07 | 105.7 | 111.1 | 19.1 | 20.0 | |
Mid speed | 12.8 | 200 | 14.8 | 7.88 | 105.8 | 111.3 | 19.1 | 20.0 | |
Low speed | 3.2 | 50 | 14.7 | 7.76 | 105.9 | 111.4 | 19.1 | 20.0 | |
Max speed | 32.768 | 64 | 256 | 6.20 | 5.71 | 113.4 | 114.1 | 20.3 | 20.5 |
High speed | 25.6 | 200 | 6.15 | 5.53 | 113.5 | 114.4 | 20.3 | 20.5 | |
Mid speed | 12.8 | 100 | 5.98 | 5.42 | 113.7 | 114.6 | 20.4 | 20.5 | |
Low speed | 3.2 | 25 | 5.78 | 5.24 | 114.0 | 114.9 | 20.4 | 20.6 | |
Max speed | 32.768 | 128 | 128 | 4.21 | 3.98 | 116.8 | 117.2 | 20.9 | 21.0 |
High speed | 25.6 | 100 | 4.16 | 3.89 | 116.9 | 117.4 | 20.9 | 21.0 | |
Mid speed | 12.8 | 50 | 4.10 | 3.75 | 117.0 | 117.8 | 20.9 | 21.1 | |
Low speed | 3.2 | 12.5 | 3.99 | 3.72 | 117.2 | 117.8 | 21.0 | 21.1 | |
Mid speed | 12.8 | 167 | 38.323 | 3.56 | 3.39 | 118.2 | 118.6 | 21.1 | 21.2 |
Max speed | 32.768 | 256 | 64 | 2.99 | 2.78 | 119.7 | 120.4 | 21.4 | 21.5 |
High speed | 25.6 | 50 | 2.95 | 2.74 | 119.8 | 120.5 | 21.4 | 21.5 | |
Mid speed | 12.8 | 25 | 2.87 | 2.69 | 120.1 | 120.6 | 21.4 | 21.5 | |
Low speed | 3.2 | 6.25 | 2.81 | 2.61 | 120.3 | 120.9 | 21.5 | 21.6 | |
Max speed | 32.768 | 333 | 49.201 | 2.67 | 2.50 | 120.7 | 121.3 | 21.5 | 21.6 |
High speed | 25.6 | 38.438 | 2.59 | 2.46 | 121.0 | 121.4 | 21.6 | 21.7 | |
Mid speed | 12.8 | 19.219 | 2.53 | 2.43 | 121.2 | 121.5 | 21.6 | 21.7 | |
Low speed | 3.2 | 4.804 | 2.46 | 2.33 | 121.4 | 121.9 | 21.7 | 21.7 | |
Max speed | 32.768 | 512 | 32 | 2.11 | 1.98 | 122.8 | 123.3 | 21.9 | 22.0 |
High speed | 25.6 | 25 | 2.09 | 1.93 | 122.8 | 123.5 | 21.9 | 22.0 | |
Mid speed | 12.8 | 12.5 | 2.01 | 1.88 | 123.2 | 123.8 | 22.0 | 22.1 | |
Low speed | 3.2 | 3.125 | 1.96 | 1.67 | 123.4 | 124.8 | 22.0 | 22.2 | |
Max speed | 32.768 | 667 | 24.564 | 1.90 | 1.77 | 123.7 | 124.3 | 22.0 | 22.1 |
High speed | 25.6 | 19.19 | 1.86 | 1.75 | 123.8 | 124.4 | 22.1 | 22.2 | |
Mid speed | 12.8 | 9.595 | 1.82 | 1.67 | 124.0 | 124.8 | 22.1 | 22.2 | |
Low speed | 3.2 | 2.39 | 1.77 | 1.65 | 124.3 | 124.9 | 22.1 | 22.2 | |
Max speed | 32.768 | 1024 | 16 | 1.50 | 1.41 | 125.7 | 126.3 | 22.4 | 22.5 |
High speed | 25.6 | 12.5 | 1.47 | 1.40 | 125.9 | 126.3 | 22.4 | 22.5 | |
Mid speed | 12.8 | 6.25 | 1.43 | 1.34 | 126.1 | 126.7 | 22.4 | 22.5 | |
Low speed | 3.2 | 1.56 | 1.42 | 1.31 | 126.2 | 126.9 | 22.5 | 22.6 | |
Max speed | 32.768 | 1333 | 12.291 | 1.36 | 1.25 | 126.6 | 127.3 | 22.5 | 22.6 |
High speed | 25.6 | 9.602 | 1.34 | 1.23 | 126.7 | 127.4 | 22.5 | 22.7 | |
Mid speed | 12.8 | 4.801 | 1.29 | 1.19 | 127.0 | 127.7 | 22.6 | 22.7 | |
Low speed | 3.2 | 1.2 | 1.24 | 1.17 | 127.4 | 127.9 | 22.7 | 22.7 | |
Max speed | 32.768 | 2048 | 8 | 1.06 | 1.00 | 128.7 | 129.2 | 22.9 | 23.0 |
High speed | 25.6 | 6.25 | 1.05 | 0.995 | 128.8 | 129.3 | 22.9 | 23.0 | |
Mid speed | 12.8 | 3.125 | 1.02 | 0.952 | 129.1 | 129.7 | 22.9 | 23.0 | |
Low speed | 3.2 | 0.78 | 0.969 | 0.935 | 129.5 | 129.8 | 23.0 | 23.1 | |
Max speed | 32.768 | 2667 | 6.143 | 0.967 | 0.890 | 129.5 | 130.3 | 23.0 | 23.1 |
High speed | 25.6 | 4.799 | 0.949 | 0.858 | 129.7 | 130.6 | 23.0 | 23.2 | |
Mid speed | 12.8 | 2.4 | 0.913 | 0.867 | 130.0 | 130.5 | 23.1 | 23.2 | |
Low speed | 3.2 | 0.6 | 0.914 | 0.844 | 130.0 | 130.7 | 23.1 | 23.2 | |
Max speed | 32.768 | 4096 | 4 | 0.751 | 0.710 | 131.7 | 132.2 | 23.4 | 23.5 |
High speed | 25.6 | 3.125 | 0.752 | 0.709 | 131.7 | 132.2 | 23.4 | 23.5 | |
Mid speed | 12.8 | 1.563 | 0.725 | 0.681 | 132.0 | 132.6 | 23.4 | 23.5 | |
Low speed | 3.2 | 0.39 | 0.709 | 0.649 | 132.2 | 133.0 | 23.5 | 23.6 | |
Max speed | 32.768 | 5333 | 3.072 | 0.697 | 0.630 | 132.4 | 133.3 | 23.5 | 23.6 |
High speed | 25.6 | 2.4 | 0.676 | 0.626 | 132.6 | 133.3 | 23.5 | 23.6 | |
Low speed | 3.2 | 0.3 | 0.661 | 0.604 | 132.8 | 133.6 | 23.6 | 23.7 | |
Mid speed | 12.8 | 13333 | 0.437 | 0.410 | 0.60 | 136.3 | 137.0 | 24.2 | 24.3 |
Mid speed | 12.8 | 16000 | 0.400 | 0.392 | 0.356 | 137.4 | 138.2 | 24.3 | 24.5 |
Max speed | 32.768 | 26667 | 0.614 | 0.335 | 0.320 | 138.7 | 139.4 | 24.5 | 24.6 |
High speed | 25.6 | 0.480 | 0.330 | 0.311 | 138.9 | 139.1 | 24.6 | 24.7 | |
Low speed | 3.2 | 0.06 | 0.316 | 0.290 | 139.2 | 140.0 | 24.7 | 24.8 | |
Max speed | 32.768 | 32000 | 0.512 | 0.309 | 0.303 | 139.4 | 139.6 | 24.7 | 24.7 |
High speed | 25.6 | 0.4 | 0.306 | 0.294 | 139.5 | 139.9 | 24.7 | 24.7 | |
Low speed | 3.2 | 0.05 | 0.290 | 0.275 | 140.0 | 140.5 | 24.8 | 24.8 | |
Mid speed | 12.8 | 48000 | 0.133 | 0.251 | 0.274 | 141.2 | 140.5 | 25.0 | 24.8 |
Mid speed | 12.8 | 80000 | 0.08 | 0.233 | 0.208 | 141.9 | 142.9 | 25.1 | 25.2 |
Max speed | 32.768 | 96000 | 0.17067 | 0.238 | 0.202 | 141.7 | 143.1 | 25.0 | 25.3 |
High speed | 25.6 | 0.133 | 0.186 | 0.250 | 143.8 | 141.3 | 25.4 | 25.0 | |
Low speed | 3.2 | 0.0167 | 0.245 | 0.207 | 141.5 | 142.9 | 25.0 | 25.2 | |
Max speed | 32.768 | 160000 | 0.102 | 0.243 | 0.243 | 141.5 | 141.5 | 25.0 | 25.0 |
High speed | 25.6 | 0.08 | 0.232 | 0.242 | 141.9 | 141.6 | 25.1 | 25.0 | |
Low speed | 3.2 | 0.01 | 0.243 | 0.177 | 141.5 | 144.3 | 25.0 | 25.5 |
MODE | fCLK (MHz) | OSR | DATA RATE (SPS) | NOISE (en, µVRMS)(1) | DYNAMIC RANGE (dB) | EFFECTIVE RESOLUTION (Bits) |
---|---|---|---|---|---|---|
Mid speed | 12.8 | 13333 | 480 | 0.573 | 134.1 | 23.8 |
Mid speed | 12.8 | 16000 | 400 | 0.533 | 134.7 | 23.9 |
Max speed | 32.768 | 26656 | 614 | 0.419 | 136.8 | 24.2 |
High speed | 25.6 | 480 | 0.416 | 136.9 | 24.2 | |
Low speed | 3.2 | 60 | 0.413 | 136.9 | 24.2 | |
Max speed | 32.768 | 32000 | 512 | 0.409 | 137.0 | 24.3 |
High speed | 25.6 | 400 | 0.387 | 137.5 | 24.3 | |
Low speed | 3.2 | 50 | 0.362 | 138.1 | 24.4 | |
Mid speed | 12.8 | 48000 | 133 | 0.321 | 139.1 | 24.6 |
Mid speed | 12.8 | 80000 | 80 | 0.274 | 140.5 | 24.8 |
Max speed | 32.768 | 96000 | 170.6 | 0.254 | 141.1 | 24.9 |
High speed | 25.6 | 133 | 0.256 | 141.1 | 24.9 | |
Low speed | 3.2 | 16.7 | 0.251 | 141.2 | 25.0 | |
Max speed | 32.768 | 160000 | 102.44 | 0.202 | 143.1 | 25.3 |
High speed | 25.6 | 80 | 0.187 | 143.8 | 25.4 | |
Low speed | 3.2 | 10 | 0.201 | 143.2 | 25.3 |
MODE | fCLK (MHz) | OSR | DATA RATE (kSPS) | NOISE (en, µVRMS) | DYNAMIC RANGE (dB) | EFFECTIVE RESOLUTION (Bits) |
---|---|---|---|---|---|---|
Max speed | 32.768 | 8 | 2048 | 641 | 73.1 | 13.6 |
High speed | 25.6 | 1600 | 648 | 73.0 | 13.6 | |
Mid speed | 12.8 | 800 | 662 | 72.8 | 13.6 | |
Low speed | 3.2 | 200 | 681 | 72.6 | 13.6 | |
Max speed | 32.768 | 16 | 1024 | 93.0 | 89.9 | 16.4 |
High speed | 25.6 | 800 | 94.8 | 89.7 | 16.4 | |
Mid speed | 12.8 | 400 | 99.9 | 89.2 | 16.3 | |
Low speed | 3.2 | 100 | 105 | 88.8 | 16.2 | |
Max speed | 32.768 | 32 | 512 | 11.0 | 108.4 | 19.5 |
High speed | 25.6 | 400 | 10.8 | 108.6 | 19.5 | |
Mid speed | 12.8 | 200 | 10.5 | 108.8 | 19.6 | |
Low speed | 3.2 | 50 | 10.3 | 109.0 | 19.6 | |
Max speed | 32.768 | 64 | 256 | 7.44 | 111.8 | 20.1 |
High speed | 25.6 | 200 | 7.30 | 112.0 | 20.1 | |
Mid speed | 12.8 | 100 | 7.09 | 112.2 | 20.1 | |
Low speed | 3.2 | 25 | 6.93 | 112.4 | 20.2 | |
Max speed | 32.768 | 128 | 128 | 5.20 | 114.9 | 20.6 |
High speed | 25.6 | 100 | 5.10 | 115.1 | 20.6 | |
Mid speed | 12.8 | 50 | 4.93 | 115.4 | 20.7 | |
Low speed | 3.2 | 12.5 | 4.82 | 115.6 | 20.7 | |
Max speed | 32.768 | 256 | 64 | 3.69 | 117.9 | 21.1 |
High speed | 25.6 | 50 | 3.63 | 118.0 | 21.1 | |
Mid speed | 12.8 | 25 | 3.48 | 118.4 | 21.2 | |
Low speed | 3.2 | 6.25 | 3.39 | 118.6 | 21.2 | |
Max speed | 32.768 | 512 | 32 | 2.64 | 120.8 | 21.6 |
High speed | 25.6 | 25 | 2.62 | 120.9 | 21.6 | |
Mid speed | 12.8 | 12.5 | 2.47 | 121.4 | 21.7 | |
Low speed | 3.2 | 3.125 | 1.27 | 127.1 | 22.6 | |
Max speed | 32.768 | 1024 | 16 | 1.94 | 123.5 | 22.0 |
High speed | 25.6 | 12.5 | 1.90 | 123.6 | 22.0 | |
Mid speed | 12.8 | 6.25 | 1.76 | 124.3 | 22.2 | |
Low speed | 3.2 | 1.5625 | 0.886 | 130.3 | 23.1 |
MODE | fCLK (MHz) | OSR | DATA RATE (kSPS) | NOISE (en, µVRMS) | DYNAMIC RANGE (dB) | EFFECTIVE RESOLUTION (Bits) |
---|---|---|---|---|---|---|
Max speed | 32.768 | 16 | 1024 | 51.0 | 95.1 | 17.3 |
High speed | 25.6 | 800 | 51.0 | 95.1 | 17.3 | |
Mid speed | 12.8 | 400 | 50.3 | 95.2 | 17.3 | |
Low speed | 3.2 | 100 | 50.0 | 95.3 | 17.3 | |
Max speed | 32.768 | 32 | 512 | 11.6 | 108.0 | 19.4 |
High speed | 25.6 | 400 | 11.4 | 108.1 | 19.5 | |
Mid speed | 12.8 | 200 | 11.1 | 108.3 | 19.5 | |
Low speed | 3.2 | 50 | 10.9 | 108.5 | 19.5 | |
Max speed | 32.768 | 64 | 256 | 7.85 | 111.3 | 20.0 |
High speed | 25.6 | 200 | 7.69 | 111.5 | 20.0 | |
Mid speed | 12.8 | 100 | 7.47 | 111.8 | 21.1 | |
Low speed | 3.2 | 25 | 7.33 | 111.9 | 21.1 | |
Max speed | 32.768 | 128 | 128 | 5.47 | 114.5 | 20.5 |
High speed | 25.6 | 100 | 5.36 | 114.7 | 20.5 | |
Mid speed | 12.8 | 50 | 5.18 | 114.9 | 20.6 | |
Low speed | 3.2 | 12.5 | 5.07 | 115.1 | 20.6 | |
Max speed | 32.768 | 256 | 64 | 3.86 | 117.5 | 21.0 |
High speed | 25.6 | 50 | 3.80 | 117.6 | 21.0 | |
Mid speed | 12.8 | 25 | 3.66 | 118.0 | 21.1 | |
Low speed | 3.2 | 6.25 | 3.58 | 118.2 | 21.1 | |
Max speed | 32.768 | 512 | 32 | 2.79 | 120.3 | 21.5 |
High speed | 25.6 | 25 | 2.73 | 120.5 | 21.5 | |
Mid speed | 12.8 | 12.5 | 2.59 | 121.0 | 21.6 | |
Low speed | 3.2 | 3.125 | 1.76 | 124.3 | 22.2 | |
Max speed | 32.768 | 1024 | 16 | 2.01 | 123.2 | 22.0 |
High speed | 25.6 | 12.5 | 1.99 | 123.3 | 22.0 | |
Mid speed | 12.8 | 6.25 | 1.83 | 124.0 | 22.1 | |
Low speed | 3.2 | 1.5625 | 1.26 | 127.2 | 22.6 | |
Max speed | 32.768 | 2048 | 8 | 1.51 | 125.6 | 22.4 |
High speed | 25.6 | 6.25 | 1.48 | 125.8 | 22.4 | |
Mid speed | 12.8 | 3.125 | 0.928 | 129.9 | 23.1 | |
Low speed | 3.2 | 0.78125 | 0.927 | 129.9 | 23.1 |