TI Debuts Industry's First Complete Analog Front End for Motor Control

2/9/2004 - Extending its portfolio of high-performance motor control converters, Texas Instruments Incorporated (TI) (NYSE: TXN) introduced a complete analog front end from the company´s Burr-Brown product line which is designed specifically for motor control applications. The ADS7869 integrates three 12-bit, 1 mega samples per second analog-to-digital converters (ADCs), including seven sample-and-hold circuits and twelve fully differential input channels. This combination allows high throughput and simultaneous sampling for motor control applications, such as multi-axis positioning, motion control and robotics.

"The ADS7869 advances the industry-standard VECANA01 motor control solution designed by Burr-Brown ten years ago, with faster sampling rate, higher integration and lower cost. This complete analog front end will allow customers to simultaneously measure three motor currents and precisely determine the position of the motor and load," said Miroslav Oljaca, strategic marketing manager for TI's motor control converter products. "There is no direct competition to the ADS7869. Motor control suppliers building a similar or even less comprehensive system with discrete components will require larger board space, higher power consumption and increased expense."

The ADS7869 includes three fully differential inputs for phase current measurement with each input connected to a window comparator and a sign comparator. This allows correction of current distortion caused by dead-time, as well as user selectable level of over-current protection. For position sensor analysis, four sign comparators connected to four input channels and two 16-bit up/down counters are incorporated along with synchronous and asynchronous sampling to enable precision encoder measurement and position control.

Key specifications include 12-bit system offset and gain adjustment for every channel, +/-1 LSB integral nonlinearity (INL), +/-0.65 LSB differential nonlinearity (DNL) and -78dB distortion (10kHz).

The device has a very flexible digital interface. Two standard parallel port operating modes, a serial peripheral interface (SPI) and a specialized serial interface with three data lines (VECANA01 mode) are provided. The ADS7869 can easily interface to most digital signal processors (DSPs) or microcontrollers.

Availability, Packaging and Pricing
The ADS7869 is available now from TI and its authorized distributors. The device is packaged in a TQFP-100 and is priced from $14.60 in 1,000 piece quantities (suggested resale price).

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