ADS7947 12-Bit, 2 MSPS, Dual Channel, Pseudo-differential uPower Serial SAR ADC | TI.com

ADS7947
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12-Bit, 2 MSPS, Dual Channel, Pseudo-differential uPower Serial SAR ADC

 

Description

The ADS7947, ADS7948, and ADS7949 are pin-compatible 12-bit, 10-bit, and 8-bit, 2-MSPS, analog-to-digital converters (ADCs), respectively. The devices operate at a 2-MSPS sample rate with a standard 16 clock data frame. In addition, the ADS7947 (12-bit) can be operated at 2.1 MSPS, the ADS7948 (10-bit) at 2.57 MSPS, and the ADS7949 (8-bit) at 3 MSPS with a short data frame optimized for the number of clocks sufficient for conversion with no drop in performance. The devices feature both outstanding dc precision and excellent dynamic performance. This family of pin-compatible devices includes a two-channel input multiplexer and a low-power successive approximation register (SAR) ADC.

The ADS7947, ADS7948, and ADS7949 support a wide analog supply range that supports the full-scale input range up to 5 V. A simple SPI digital interface, 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 WQFN package, the ADS7947, ADS7948, and ADS7949 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 size are key.

Features

  • Sample rate: 2 MSPS
  • Pin-compatible family: 12-, 10-, 8-bit
  • High resolution, high throughput:
    • ADS7947: 12 bit, 2.1 MSPS
    • ADS7948: 10 bit, 2.57 MSPS
    • ADS7949: 8 bit, 3 MSPS
  • Excellent performance:
    • No missing codes
    • INL: 1 LSB (max)
    • SNR: 72 dB (min)
  • Low power:
    • 7.5 mW at 2-MSPS operation
    • Auto power-down at lower speeds:
      • 3.8 mW at 500 kSPS
      • 0.8 mW at 100 kSPS
      • 0.16 mW at 20 kSPS
  • Wide supply range:
    • Analog: 2.7 V to 5.5 V
    • Digital: 1.65 V to AVDD
  • SPI-compatible serial interface
  • Extended temperature range: –40°C to +125°C
  • Tiny footprint: 3-mm × 3-mm WQFN

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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
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    
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    
ADS7948 Order now 10     2000     2     SPI