Texas Instruments Incorporated has introduced a family of 16-, 14- and 12-bit simultaneous sampling successive approximation register (SAR) analog-to-digital converters (ADCs) with high-voltage inputs.
The ADS8556, ADS8557 and ADS8558 offer a sampling range of 730 kSPS and signal-to-noise ratio (SNR) up to 91.5 dB, and include the industry's only simultaneous sampling ADC that offers true, 16-bit no missing codes (NMC) performance. The new ADCs allow designers to maximize performance when connecting to a wide range of inputs or sensor types in applications including multi-axis motor control, simultaneous data acquisition, robotics, power quality management and power protection.
Key features and benefits
SNR of 91.5 db (typical) is up to 3.5 db better than the competition, for higher resolution of dynamic range signals; sampling rate of 730 kSPS per channel is more than twice that of the closest competitor
True bipolar inputs with software-selectable input ranges up to ±12 V allow easy connectivity to a wide range of inputs and sensors
Low power dissipation of 298.5 mW at maximum data rate; 150 mW at 250 kSPS
Excellent performance and external conversion for multiple device synchronization, resulting in flexible and expandable systems
The device's performance is maximized when used with TI's low-noise operational amplifiers: the low-noise, high-precision OPA827 featuring a FET input for high-impedance output sources; and the OPA211, TI's low-power, lowest noise ±18-V op amp. These ADCs work well with many microcontrollers and embedded controllers, including TI's TMS320F2812.
Availability and pricing
The ADS8556 is available today in an LQFP-64 package and is pin-compatible with the 14-bit ADS8557 and the 12-bit ADS8558. Pricing in 1,000-unit quantities is $15.95 (ADS8556), $10.95 (ADS8557) and $8.95 (ADS8558).
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