SBAT010A March 2023 – October 2025 ADS7042 , ADS7044 , ADS7046 , ADS7047 , ADS7052 , ADS7054 , ADS7056 , ADS7057 , ADS7223 , ADS7253 , ADS7254 , ADS7263 , ADS7853 , ADS7854 , ADS8353 , ADS8354 , ADS8363 , ADS9218 , ADS9224R , ADS9234R , ADS9326 , ADS9327
Example: Optical Motor Encoder Block DiagramDesign Considerations
What are the Key Specifications for Analog-to-Digital Converters (ADCs) in Motor Encoders?
- Resolution: Higher resolution ADCs improve the position sensing accuracy in absolute and incremental encoders.
- Sampling rate: The signal-chain bandwidth required by the encoder is determined by the resolution (periods per revolution) and speed (revolutions per minute) of the motor. In typical applications, the signal-chain bandwidth needed is ≥ 500kHz, so the precision ADC must have a sampling rate ≥ 1 MSPS.
- Size: Encoders are typically located on a PCB mounted on the motor; therefore, a small form factor ADC is required.
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Recommended Parts
| Part Number | Resolution | Sampling Rate (MSPS) | Channel Count | Input Type | Reference | Analog Supply | Package |
|---|---|---|---|---|---|---|---|
| Group 1(1) | |||||||
| ADS7042 | 12 | 1 | 1 | Single-ended | External | 3.3V | 1.5mm × 1.5mm X2QFN |
| ADS7044 | Differential | ||||||
| ADS7046 | 12 | 3 | Single-ended | ||||
| ADS7047 | Differential | ||||||
| ADS7052 | 14 | 1 | Single-ended | ||||
| ADS7054 | Differential | ||||||
| ADS7056 | 14 | 2.5 | Single-ended | ||||
| ADS7057 | Differential | ||||||
| Group 2(1) | |||||||
| ADS7253 | 12 | 1 | 2 | Single-ended | Internal and External | 5V | 3mm × 3mm WQFN |
| ADS7254 | Differential | ||||||
| ADS7853 | 14 | 1 | Single-ended | ||||
| ADS7854 | Differential | ||||||
| ADS8353 | 16 | 0.6 | Single-ended | ||||
| ADS8354 | Differential | ||||||
| Group 3(1) | |||||||
| ADS7223 | 12 | 1 | 8 SE 4 DIFF | Single-ended, Differential | Internal and External | 5V | 5mm × 5mm VQFN |
| ADS7263 | 14 | 1 | |||||
| ADS8363 | 16 | 1 | |||||
| Group 4(1) | |||||||
| ADS9234R | 14 | 3.5 | 2 | Differential | Internal and External | 5V | 5mm × 5mm VQFN |
| ADS9224R | 16 | 3 | |||||
| Group 5(1) | |||||||
16 | 20 | 2 | Differential | Internal and External | 5V | 6mm × 6mm VQFN | |
10 | |||||||
5 | |||||||
| 18 | 20 | ||||||
| ADS9218 | 10 | ||||||
5 | |||||||
| Group 6(1) | |||||||
16 | 5 | 2 | Differential | Internal and External | 5V and 3.3V |
3.5mm × 3.5mm | |
3 | |||||||
(1) The devices that are grouped together are pin-to-pin compatible.