ADS7945 14-Bit, 2MSPS, Dual-Channel, Unipolar, Differential, u-Power SAR ADC | TI.com

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

 

Description

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.

Features

  • 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

WEBENCH® Designer ADS7945



Parametrics

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Part number Order Resolution (Bits) Sample rate (Max) (kSPS) Number of input channels Interface Operating temperature range (C) Package Group Approx. price (US$) Power consumption (Typ) (mW) Package size: mm2:W x L (PKG) Architecture Input type Multi-channel configuration Reference mode Features Input range (Max) (V) Input range (Min) (V) Analog voltage AVDD (Min) (V) Analog voltage AVDD (Max) (V) Digital supply (Min) (V) Digital supply (Max) (V) INL (Max) (+/-LSB) SNR (dB) THD (Typ) (dB) Rating
ADS7945 Order now 14     2000     2     SPI     -40 to 125     WQFN | 16     3.95 | 1ku     10.5     16WQFN: 9 mm2: 3 x 3 (WQFN | 16)     SAR     Differential     Multiplexed     Ext     Small Size     5.25     0     2.7     5.25     1.65     5.25     1.5     84     -92     Catalog    
ADS7946 Order now 14     2000     2     SPI     -40 to 125     WQFN | 16     3.80 | 1ku     10.5     16WQFN: 9 mm2: 3 x 3 (WQFN | 16)     SAR     Pseudo-Differential
Single-Ended    
Multiplexed     Ext     Small Size     5.25     0     2.7     5.25     1.65     5.25     2.5     82     -85     Catalog    
ADS7947 Order now 12     2000     2     SPI     -40 to 125     WQFN | 16     1.50 | 1ku     7.5     16WQFN: 9 mm2: 3 x 3 (WQFN | 16)     SAR     Pseudo-Differential
Single-Ended    
Multiplexed     Ext     Small Size     5.5     0     2.7     5.5     1.65     5.5     1     73     -85     Catalog    
ADS7948 Order now 10     2000     2     SPI