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TI ADCs simplify system-level design

Posted: 09 Mar 2011 ?? ?Print Version ?Bookmark and Share

Keywords:SAR? A/D? ADCs? system-level design?

Texas Instruments Inc. rolls three two-channel, simultaneous-sampling successive approximation (SAR) ADCs. The 16-bit ADS8363, 14-bit ADS7263 and 12-bit ADS7223 each offer two independently controlled internal references for simplified system-level design. They are pin-for-pin compatible and provide twice the per-channel throughput of similar ADCs, supporting speeds up to 1MSps. They are suited for industrial and energy applications such as motor control, power quality measurement, protection relays, power automation, solar inverters and wind generators.

The ADCs integrates two 2.5V, independently controlled references, enabling separate ADC gain calibration and the implementation of a programmable gain amplifier. This feature also reduces the need for external signal conditioning when different gain levels are required for each ADC.

Their 1MSps throughput increases efficiency for higher performance. When used for motor control, this increases the number of measurements per rotation, providing finer motor position accuracy.

First in, first out (FIFO) feature reduces processor accesses by 75 percent or more compared to alternative solutions. This can reduce system power consumption or increase performance by freeing MIPS for other tasks.

The ADCs reduce component count by supporting up to eight pseudo-differential or four fully-differential input channels grouped into two pairs, doubling the number of supported inputs compared to the closest 16- and 14-bit competitors.

They are characterized for harsh industrial environments up to 125C, making the ADS8363 the highest temperature-rated device in its class.

TI offers a variety of free tools and support to speed development with the ADS8363, ADS7263 and ADS7223, including an IBIS model to verify board signal integrity requirements and calculators for anti-aliasing and circuit topography.

An evaluation module (ADS8363EVM), including the OPA365 rail-to-rail operational amplifier (op amp), is available to speed evaluation of these new ADCs. The ADS8363EVM can be ordered today for $49.

The ADS8363, ADS7263 and ADS7223 are all available now in a 5 x 5mm QFN package. Suggested retail pricing for 1,000-unit quantities is as follows: $9.95 for the ADS8363, $6.95 for the ADS7263 and $3.95 for the ADS7223.

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