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AFE (analog front end)
prasimix edited this page Dec 17, 2019
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Add here ideas and suggestions about AFE section. Multiple AFEs are proposed to address various functionality and each of them represents separate piggyback that is pluggable on the main PCB (where is DBE and power section located).
Thermocouple sensors requires high resolution ADC (e.g. 18-bit and more). Sampling rate is not so critical (e.g. below 1 KSPS). Power analyzer requires simultaneous conversion. We're looking for sampling rate between 10 KSPS to 500 KSPS per channel. Data logging should also benefit from simultaneous conversion (e.g. when power or energy is measured for battery, PV cells testing, etc.) Multichannel simultaneous ADC contenders comes from TI, Analog and Maxim:
| Ch | Res. | Inputs | Name | Sampling rate [SPS] | Interface | Price |
|---|---|---|---|---|---|---|
| 8 | 24 | Differential/Single-Ended | AD7779ACPZ | 16K | SPI | €8.82 |
| 8 | 24 | Differential/Pseudo-Differential | ADS131E08SPAG | 64K | SPI | €10.53 |
| 8 | 14 | Single-ended | MAX11048ECB+ | 250K | Parallel | €10.88 |
| 8 | 16 | Differential/Pseudo-Differential | AD7761BSTZ | 256K | Parallel | €11.11 |
| 8 | 16 | Single-ended | MAX11046BETN+ | 250K | Parallel | €11.99 |
| 8 | 16 | Single-Ended | ADS1178IPAPT | 52K | SPI | €12.79 |
| 6 | 16 | Single-ended | MAX11048ECB+ | 250K | Parallel | €13.19 |
| 8 | 16 | Single-ended | MAX11049ECB+ | 250K | Parallel | €16.12 |
| Ch | Res. | Inputs | Name | Sampling rate [SPS] | Interface | Price |
|---|---|---|---|---|---|---|
| 1 | 24 | Differential/Single-Ended | MAX11200EEE+ | 480 | SPI+4xGPIO | €2.81 |
| 1 | 24 | Differential/Single-Ended | MAX11210EEE+ | 480 | SPI+4xGPIO | €3.02 |
| Inputs | Outputs | Name | Price |
|---|---|---|---|
| 4 | 1 | MAX4782EUE+ | €2.51 |
| 8 | 1 | MAX4781EUE+ | €2.51 |