For various motor types; AC Induction (ACIM), Brushed DC , Brushless DC (BLDC), Permanent Magnet Synchronous and Stepper find the right analog and digital products, software and support to precisely control the position, velocity and torque

Discrete Analog-to-Digital Converters (ADC)

Discrete Analog-to-Digital converters (ADCs) are often used in high voltage or high precision motor control where the on-chip ADC in the micro controller does not offer enough performance or when using digital isolation to separate the sensitive control logic from high voltage power stage. Off-chip ADCs are also used when there is a need for higher simultaneously-sampling multiple analog inputs such as in chain or belt drives where the motor and load do not turn at 1:1 ratios or slippage and slack need to be detected.

There are 2 main types of ADCs used in motor control applications, simultaneous-sampling Successive Approximation Register (SAR) converters and delta-sigma modulators. Simultaneous-sampling converters use multiple sample-and-hold circuits which are synchronized to a single digital input to precisely capture multiple analog inputs while maintaining their phase relationships which is critical to the accuracy of sin-cosine encoders, resolvers, or when measuring multiple phase currents at the same time.

Delta-Sigma modulators are designed to be placed close to the sensor and produce a single bit digital data stream which can achieve 16-bit resolution after filtering in the controller or with an external filter like the AMC1210. TI offers a large portfolio of delta-sigma modulators designed for all types of current feedback in motor drivers (current shunt, magnetic and hall effect sensors). The single bit digital output generated by delta-sigma modulators make them a good choice for current measurement where digital isolation is used to protect the host controller.

Advantages to TI's Discrete Analog-to-Digital Converters:

• Simultaneously sample up to 6 channels with 16-bit resolution and up to 800kSPS per channel
• Built on the latest analog process to maximize stability over time and temperature
• Dual channel signaling internally with a fast AC path and secondary channel to guarantee DC stability ensures the best performance in all conditions
• SPI Bus from the ADC or digital bit stream from the modulators can easily be isolated using TI's digital isolation technology to protect the controller or MCU from electrical faults in the power-stage and increase system reliability