ADS7945 - 14-Bit, 2MSPS, Dual-Channel, Unipolar, Differential, u-Power SAR ADC

The ADS7945/6 are 14-bit, 2 MSPS analog-to-digital converters (ADCs), with differential and single-ended inputs, respectively. The devices operate at a 2 MSPS sample rate with a standard 16-clock data frame. The devices feature both outstanding dc precision and excellent dynamic performance; the ADS7946 is pin-compatible with the 8/10/12-bit ADS7947/8/9 devices. The devices include a two-channel input multiplexer and a low-power successive approximation register (SAR) ADC with an inherent sample-and-hold (S/H) input stage.

The ADS7945/6 support a wide analog supply range that allows the full-scale input range to extend to ±5 V differential or 5 V single-ended. A simple SPI™, with a digital supply that can operate as low as 1.65 V, allows for easy interfacing to a wide variety of digital controllers. Automatic power-down can be enabled when operating at slower speeds to dramatically reduce power consumption.

Offered in a tiny 3 mm × 3 mm QFN package, the ADS7945/6 are fully specified over the extended temperature range of –40°C to +125°C and are suitable for a wide variety of data acquisition applications where high performance, low power, and small package size are key.

• Sample Rate: 2 MSPS
• 14-Bit, Pin-Compatible with 8/10/12-bit ADS7947/8/9 Family (ADS7946)
• Outstanding Performance:
  • SNR: 84 dB (ADS7945)
  • No Missing Codes
  • INL: 1.5 LSB (max) (ADS7945)
• Low Power:
  • 11.6 mW at 2 MSPS Operation
  • Auto Power-Down at Lower Speeds: 7.2 mW at 500 kSPS1.4 mW at 100 kSPS0.3 mW at 20 kSPS
• Wide Supply Range:
  • Analog: 2.7 V to 5.25 V
  • Digital: 1.65 V to AVDD
• Simple Serial Interface (SPI)
• Fully Specified from –40°C to +125°C
• Tiny Footprint: 3 mm × 3 mm QFN