ADS7946 14-Bit, 2MSPS, Dual-Channel, Unipolar, Pseudo-Differential, u-Power SAR ADC | TI.com

ADS7946 (ACTIVE)

14-Bit, 2MSPS, Dual-Channel, Unipolar, Pseudo-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

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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
ADS7946 ADS7945 ADS7947 ADS7948 ADS7949
14     14     12     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    
3.80 | 1ku     3.95 | 1ku     1.50 | 1ku     0.94 | 1ku     0.75 | 1ku    
10.5     10.5     7.5     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    
5.25     5.25     5.5     5.5     5.5    
0     0     0     0     0    
2.7     2.7     2.7     2.7     2.7    
5.25     5.25     5.5     5.5     5.5    
1.65     1.65     1.65     1.65     1.65    
5.25     5.25     5.5     5.5     5.5    
2.5     1.5     1     0.5     0.3    
78.8     83.5     72.75     61     49    
82