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

ADS7947 (ACTIVE)

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

 

Description

The ADS7947/8/9 are 12-bit, 10-bit, and 8-bit 2MSPS analog-to-digital converters (ADCs), respectively. Devices operate at 2MSPS sample rate with a standard 16 clock data frame. In addition, it is possible to operate the ADS7947 (12-bit) at 2.1MSPS, the ADS7948 (10-bit) at 2.57MSPS, and the ADS7949 (8-bit) at 3MSPS 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 with an inherent sample-and-hold (S/H) input stage.

The ADS7947/8/9 support a wide analog supply range that allows the full-scale input range to extend to 5V. A simple SPI, with a digital supply that can operate as low as 1.65V, 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 3mm × 3mm QFN package, the ADS7947/8/9 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: 2MSPS
  • Pin-Compatible Family: 12/10/8-Bit
  • Outstanding Performance:
    • No Missing Codes
    • INL: 1LSB (max)
    • SNR: 72dB (min)
  • Low Power:
    • 7.5mW at 2MSPS Operation
    • Auto Power-Down at Lower Speeds:
      • 3.8mW at 500kSPS
      • 0.8mW at 100kSPS
      • 0.16mW at 20kSPS
  • Wide Supply Range:
    • Analog: 2.7V to 5.5V
    • Digital: 1.65V to AVDD
  • Simple Serial Interface (SPI)
  • Fully Specified from –40°C to +125°C
  • Tiny Footprint: 3mm × 3mm QFN
  • APPLICATIONS
    • Communication Systems
    • Optical Networking
    • Medical Instrumentation
    • Battery-Powered Equipment
    • Data Acquisition Systems

SPI is a trademark of Motorola.
All other trademarks are the property of their respective owners.

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Parametrics Compare all products in Precision ADCs (<=10MSPS)

 
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)
SINAD (dB)
SNR (dB)
THD (Typ) (dB)
Rating
ADS7947 ADS7945 ADS7946 ADS7948 ADS7949
12     14     14     10     8    
2000     2000     2000     2000     2000    
2     2     2     2     2    
SPI     SPI     SPI     SPI     SPI    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
WQFN | 16     WQFN | 16     WQFN | 16     WQFN | 16     WQFN | 16    
1.50 | 1ku     3.95 | 1ku     3.80 | 1ku     0.94 | 1ku     0.75 | 1ku    
7.5     10.5     10.5     7.5     7.5    
16WQFN: 9 mm2: 3 x 3 (WQFN | 16)     16WQFN: 9 mm2: 3 x 3 (WQFN | 16)     16WQFN: 9 mm2: 3 x 3 (WQFN | 16)     16WQFN: 9 mm2: 3 x 3 (WQFN | 16)     16WQFN: 9 mm2: 3 x 3 (WQFN | 16)    
SAR     SAR     SAR     SAR     SAR    
Pseudo-Differential
Single-Ended    
Differential     Pseudo-Differential
Single-Ended    
Pseudo-Differential
Single-Ended    
Pseudo-Differential
Single-Ended    
Multiplexed     Multiplexed     Multiplexed     Multiplexed     Multiplexed    
Ext     Ext     Ext     Ext     Ext    
Small Size     Small Size     Small Size     Small Size     Small Size    
5.5     5.25     5.25     5.5     5.5    
0     0     0     0     0    
2.7     2.7     2.7     2.7     2.7    
5.5     5.25     5.25     5.5     5.5    
1.65     1.65     1.65     1.65     1.65    
5.5     5.25     5.25     5.5     5.5    
1     1.5     2.5     0.5     0.3    
72.75     83.5     78.8     61     49    
73