SBAT010 March   2023 ADS7042 , ADS7044 , ADS7046 , ADS7047 , ADS7052 , ADS7054 , ADS7056 , ADS7057 , ADS7223 , ADS7253 , ADS7254 , ADS7263 , ADS7853 , ADS7854 , ADS8353 , ADS8354 , ADS8363 , ADS9218 , ADS9224R , ADS9234R

 

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GUID-20230321-SS0I-W84L-STHL-SCRLHT5FZ6WC-low.svgExample: Optical Motor Encoder Block Diagram

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 ≥ 500 kHz, 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 3.3 V 1.5 mm × 1.5 mm
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 5 V 3 mm × 3 mm
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 5 V 5 mm × 5 mm
VQFN
ADS7263 14 1
ADS8363 16 1
Group 4(1)
ADS9234R 14 3.5 2 Differential Internal and External 5 V 5 mm × 5 mm
VQFN
ADS9224R 16 3
Group 5
ADS9218 18 10 2 Differential External 5 V 6 mm × 6 mm
VQFN
(1) The devices that are grouped together are pin-to-pin compatible.