Texas Instruments Introduces ADS8556, ADS8557, ADS8558 SAR ADCs

Texas Instruments Incorporated (TI) (NYSE: TXN) 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
    • ADS8556 (16-bit) 91.5 SNR; 2x faster
    • ADS8557 (14-bit) 85 SNR; 2.5x faster
    • ADS8558 (12-bit) 73.9 SNR; ~3x faster
  • 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).

About Texas Instruments
Texas Instruments (NYSE: TXN) helps customers solve problems and develop new electronics that make the world smarter, healthier, safer, greener and more fun. A global semiconductor company, TI innovates through manufacturing, design and sales operations in more than 30 countries.