JAJSOX0B March 2024 – November 2024 ADS127L18
PRODMIX
The ADCs offer four speed modes allowing trade-offs between power consumption, bandwidth, and resolution. The modes are max speed, high speed, mid speed, and low speed, with decreasing levels of device power consumption. The wideband filter offers data rates up to 512kSPS in max-speed mode, 400kSPS in high-speed mode, 200kSPS in mid-speed mode, and 50kSPS in low-speed mode.
The low-latency sinc4 filter offers data rates up to 1.365MSPS in max-speed mode, 1.066MSPS in high-speed mode, 533kSPS in mid-speed mode, and 133kSPS in low-speed mode.
The programmable oversampling ratio (OSR) establishes the output data rate and associated signal bandwidth that in turn determines 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 7-7 through Table 6-5 summarize the noise performance of the filters. Noise performance is illustrated with 1x input range and a 4.096V reference voltage. In comparison, decreasing the reference voltage to 2.5V decreases dynamic range by 4dB (typical). Operation in 2x input range and a 2.5V reference voltage decreases dynamic range by 3dB (typical) compared to the 1x input range and 4.096V reference voltage.
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 8,192 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 yield higher or lower noise results.
Equation 13 converts RMS noise to dynamic range (dB) and Equation 14 converts RMS noise to effective resolution (bits).
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 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 | 10.9 | 108.5 | 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 | 10.4 | 108.9 | 19.6 | |
Max speed | 32.768 | 64 | 256 | 7.48 | 111.8 | 20.1 |
High speed | 25.6 | 200 | 7.33 | 111.9 | 20.1 | |
Mid speed | 12.8 | 100 | 7.21 | 112.1 | 20.1 | |
Low speed | 3.2 | 25 | 7.17 | 112.1 | 20.1 | |
Max speed | 32.768 | 128 | 128 | 5.17 | 115.0 | 20.6 |
High speed | 25.6 | 100 | 5.14 | 115.0 | 20.6 | |
Mid speed | 12.8 | 50 | 5.02 | 115.2 | 20.6 | |
Low speed | 3.2 | 12.5 | 5.02 | 115.2 | 20.6 | |
Max speed | 32.768 | 256 | 64 | 3.64 | 118.0 | 21.1 |
High speed | 25.6 | 50 | 3.59 | 118.1 | 21.1 | |
Mid speed | 12.8 | 25 | 3.55 | 118.2 | 21.1 | |
Low speed | 3.2 | 6.25 | 3.55 | 118.2 | 21.1 | |
Max speed | 32.768 | 512 | 32 | 2.56 | 121.1 | 21.6 |
High speed | 25.6 | 25 | 2.55 | 121.1 | 21.6 | |
Mid speed | 12.8 | 12.5 | 2.49 | 121.3 | 21.6 | |
Low speed | 3.2 | 3.125 | 2.49 | 121.3 | 21.6 | |
Max speed | 32.768 | 1024 | 16 | 1.73 | 124.5 | 22.2 |
High speed | 25.6 | 12.5 | 1.80 | 124.1 | 22.1 | |
Mid speed | 12.8 | 6.25 | 1.73 | 124.5 | 22.2 | |
Low speed | 3.2 | 1.5625 | 1.75 | 124.4 | 22.2 | |
Max speed | 32.768 | 2048 | 8 | 1.37 | 126.5 | 22.5 |
High speed | 25.6 | 6.25 | 1.28 | 127.1 | 22.6 | |
Mid speed | 12.8 | 3.125 | 1.26 | 127.2 | 22.6 | |
Low speed | 3.2 | 0.78125 | 1.26 | 127.2 | 22.6 | |
Max speed | 32.768 | 4096 | 4 | 0.930 | 129.9 | 23.1 |
High speed | 25.6 | 3.125 | 0.917 | 130.0 | 23.1 | |
Mid speed | 12.8 | 1.5625 | 0.900 | 130.2 | 23.1 | |
Low speed | 3.2 | 0.390625 | 0.890 | 130.3 | 23.1 |
MODE | fCLK (MHz) |
OSR | DATA RATE (kSPS) |
NOISE (en, µVRMS) |
DYNAMIC RANGE (dB) |
EFFECTIVE RESOLUTION (Bits) |
---|---|---|---|---|---|---|
Max speed | 32.768 | 12 | 1365.3 | 65.1 | 93.0 | 16.9 |
High speed | 25.6 | 1066.6 | 66.1 | 92.8 | 16.9 | |
Mid speed | 12.8 | 533.3 | 65.3 | 92.9 | 16.9 | |
Low speed | 3.2 | 133.33 | 65.3 | 92.9 | 16.9 | |
Max speed | 32.768 | 16 | 1024 | 25.1 | 101.2 | 18.3 |
High speed | 25.6 | 800 | 25.1 | 101.3 | 18.3 | |
Mid speed | 12.8 | 400 | 24.6 | 101.4 | 18.3 | |
Low speed | 3.2 | 100 | 24.7 | 101.4 | 18.3 | |
Max speed | 32.768 | 24 | 682.67 | 10.4 | 108.9 | 19.6 |
High speed | 25.6 | 533.3 | 10.3 | 108.9 | 19.6 | |
Mid speed | 12.8 | 266.67 | 10.1 | 109.1 | 19.6 | |
Low speed | 3.2 | 66.67 | 10.1 | 109.1 | 19.6 | |
Max speed | 32.768 | 32 | 512 | 8.05 | 111.1 | 20.0 |
High speed | 25.6 | 400 | 7.83 | 111.4 | 20.0 | |
Mid speed | 12.8 | 200 | 7.78 | 111.4 | 20.0 | |
Low speed | 3.2 | 50 | 7.76 | 111.4 | 20.0 | |
Max speed | 32.768 | 64 | 256 | 5.46 | 114.5 | 20.5 |
High speed | 25.6 | 200 | 5.44 | 114.5 | 20.5 | |
Mid speed | 12.8 | 100 | 5.30 | 114.8 | 20.6 | |
Low speed | 3.2 | 25 | 5.30 | 114.8 | 20.6 | |
Max speed | 32.768 | 128 | 128 | 3.79 | 117.7 | 21.0 |
High speed | 25.6 | 100 | 3.76 | 117.7 | 21.1 | |
Mid speed | 12.8 | 50 | 3.68 | 117.9 | 21.1 | |
Low speed | 3.2 | 12.5 | 3.62 | 118.1 | 21.1 | |
Max speed | 32.768 | 256 | 64 | 2.74 | 120.5 | 21.5 |
High speed | 25.6 | 50 | 2.69 | 120.6 | 21.5 | |
Mid speed | 12.8 | 25 | 2.63 | 120.8 | 21.6 | |
Low speed | 3.2 | 6.25 | 2.62 | 120.9 | 21.6 | |
Max speed | 32.768 | 512 | 32 | 1.90 | 123.7 | 22.0 |
High speed | 25.6 | 25 | 1.89 | 123.7 | 22.0 | |
Mid speed | 12.8 | 12.5 | 1.86 | 123.8 | 22.1 | |
Low speed | 3.2 | 3.125 | 1.84 | 123.9 | 22.1 | |
Max speed | 32.768 | 1024 | 16 | 1.34 | 126.7 | 22.5 |
High speed | 25.6 | 12.5 | 1.34 | 126.7 | 22.5 | |
Mid speed | 12.8 | 6.25 | 1.33 | 126.8 | 22.6 | |
Low speed | 3.2 | 1.56 | 1.32 | 126.8 | 22.6 | |
Max speed | 32.768 | 2048 | 8 | 0.98 | 129.4 | 23.0 |
High speed | 25.6 | 6.25 | 0.95 | 129.7 | 23.0 | |
Mid speed | 12.8 | 3.125 | 0.93 | 129.9 | 23.1 | |
Low speed | 3.2 | 0.78 | 0.92 | 130.0 | 23.1 | |
Max speed | 32.768 | 4096 | 4 | 0.70 | 132.3 | 23.5 |
High speed | 25.6 | 3.125 | 0.69 | 132.5 | 23.5 | |
Mid speed | 12.8 | 1.563 | 0.66 | 132.8 | 23.6 | |
Low speed | 3.2 | 0.39 | 0.66 | 132.8 | 23.6 |
MODE | fCLK (MHz) |
OSR | DATA RATE (kSPS) |
NOISE (en) (µVRMS) |
DYNAMIC RANGE (dB) |
EFFECTIVE RESOLUTION (Bits) |
---|---|---|---|---|---|---|
Max speed | 32.768 | 64 | 256 | 6.77 | 112.6 | 20.2 |
High speed | 25.6 | 200 | 6.62 | 112.8 | 20.2 | |
Mid speed | 12.8 | 100 | 6.60 | 112.8 | 20.2 | |
Low speed | 3.2 | 25 | 6.50 | 113.0 | 20.3 | |
Max speed | 32.768 | 128 | 128 | 5.16 | 115.0 | 21.0 |
High speed | 25.6 | 100 | 5.13 | 115.0 | 20.6 | |
Mid speed | 12.8 | 50 | 5.07 | 115.1 | 20.6 | |
Low speed | 3.2 | 12.5 | 5.02 | 115.2 | 20.6 | |
Max speed | 32.768 | 320 | 51.2 | 3.39 | 118.6 | 21.2 |
High speed | 25.6 | 40 | 3.35 | 118.7 | 21.2 | |
Mid speed | 12.8 | 20 | 3.29 | 118.9 | 21.2 | |
Low speed | 3.2 | 5 | 3.28 | 118.9 | 21.3 | |
Max speed | 32.768 | 640 | 25.6 | 2.42 | 121.6 | 21.7 |
High speed | 25.6 | 20 | 2.39 | 121.7 | 21.7 | |
Mid speed | 12.8 | 10 | 2.35 | 121.8 | 21.7 | |
Low speed | 3.2 | 2.5 | 2.36 | 121.8 | 21.7 | |
Max speed | 32.768 | 1280 | 12.8 | 1.74 | 124.4 | 22.2 |
High speed | 25.6 | 10 | 1.73 | 124.5 | 22.2 | |
Mid speed | 12.8 | 5 | 1.69 | 124.7 | 22.2 | |
Low speed | 3.2 | 1.25 | 1.68 | 124.7 | 22.2 | |
Max speed | 32.768 | 3200 | 5.12 | 1.10 | 128.4 | 22.8 |
High speed | 25.6 | 4 | 1.09 | 128.5 | 22.8 | |
Mid speed | 12.8 | 2 | 1.07 | 128.7 | 22.9 | |
Low speed | 3.2 | 0.5 | 1.07 | 128.7 | 22.9 | |
Max speed | 32.768 | 6400 | 2.56 | 0.79 | 131.3 | 23.3 |
High speed | 25.6 | 2 | 0.78 | 131.4 | 23.3 | |
Mid speed | 12.8 | 1 | 0.77 | 131.5 | 23.3 | |
Low speed | 3.2 | 0.25 | 0.77 | 131.5 | 23.3 | |
Max speed | 32.768 | 12800 | 1.28 | 0.57 | 134.1 | 23.8 |
High speed | 25.6 | 1 | 0.56 | 134.3 | 23.8 | |
Mid speed | 12.8 | 0.5 | 0.55 | 134.4 | 23.8 | |
Low speed | 3.2 | 0.125 | 0.54 | 134.6 | 23.9 | |
Max speed | 32.768 | 32000 | 0.512 | 0.37 | 137.9 | 24.4 |
High speed | 25.6 | 0.4 | 0.37 | 137.9 | 24.4 | |
Mid speed | 12.8 | 0.2 | 0.37 | 137.9 | 24.4 | |
Low speed | 3.2 | 0.05 | 0.37 | 137.9 | 24.4 |
MODE | fCLK (MHz) |
OSR | DATA RATE (SPS) |
NOISE (en) (µVRMS) (1) |
DYNAMIC RANGE (dB) |
EFFECTIVE RESOLUTION (Bits) |
---|---|---|---|---|---|---|
Max speed | 32.768 | 26667 | 614.4 | 0.32 | 139.1 | 24.6 |
High speed | 25.6 | 480 | 0.32 | 139.1 | 24.6 | |
Mid speed | 12.8 | 240 | 0.32 | 139.1 | 24.6 | |
Low speed | 3.2 | 60 | 0.32 | 139.1 | 24.6 | |
Max speed | 32.768 | 32000 | 512 | 0.32 | 139.1 | 24.6 |
High speed | 25.6 | 400 | 0.31 | 139.4 | 24.7 | |
Mid speed | 12.8 | 200 | 0.31 | 139.4 | 24.7 | |
Low speed | 3.2 | 50 | 0.31 | 139.4 | 24.7 |
MODE | fCLK (MHz) |
OSR | DATA RATE (SPS) |
NOISE (en) (µVRMS) (1) |
DYNAMIC RANGE (dB) |
EFFECTIVE RESOLUTION (Bits) |
---|---|---|---|---|---|---|
Max speed | 32.768 | 96000 | 170.6 | 0.25 | 141.3 | 25.0 |
High speed | 25.6 | 133.3 | 0.25 | 141.3 | 25.0 | |
Mid speed | 12.8 | 66.6 | 0.25 | 141.3 | 25.0 | |
Low speed | 3.2 | 16.6 | 0.25 | 141.3 | 25.0 | |
Max speed | 32.768 | 160000 | 102.4 | 0.24 | 141.6 | 25.0 |
High speed | 25.6 | 80 | 0.25 | 141.3 | 25.0 | |
Mid speed | 12.8 | 40 | 0.25 | 141.3 | 25.0 | |
Low speed | 3.2 | 10 | 0.25 | 141.3 | 25.0 |