ADS7891 2.7V-5.25V Digital, 5V Analog, 14-Bit 3MSPS Parallel ADC With Internal Reference | TI.com

ADS7891 (ACTIVE)

2.7V-5.25V Digital, 5V Analog, 14-Bit 3MSPS Parallel ADC With Internal Reference

2.7V-5.25V Digital, 5V Analog, 14-Bit 3MSPS Parallel ADC With Internal Reference - ADS7891
Datasheet
 

Description

The ADS7891 is a 14-bit 3-MSPS A-to-D converter with 2.5-V internal reference. The device includes a capacitor based SAR A/D converter with inherent sample and hold. The device offers a 14-bit parallel interface with an additional byte mode that provides easy interface with 8-bit processors. The device has a pseudo-differential input stage.

The –IN swing of ±200 mV is useful to compensate for ground voltage mismatch between the ADC and sensor and also to cancel common-mode noise. With nap mode enabled, the device operates at lower power when used at lower conversion rates. The device is available in a 48-pin TQFP package.

Features

  • 3 MHz Sample Rate, 14-Bit Resolution
  • Zero Latency
  • Unipolar, Pseudo Differential Input, Range:
    • 0 V to 2.5 V
  • High Speed Parallel Interface
  • 78 dB SNR and 88.5 dB THD at 3 MSPS
  • Power Dissipation 85 mW at 3 MSPS
  • Nap Mode (10 mW Power Dissipation)
  • Power Down (10 µW)
  • Internal Reference
  • Internal Reference Buffer
  • 8-/14-Bit Bus Transfer
  • 48-Pin TQFP Package
  • APPLICATIONS
    • Optical Networking (DWDM, MEMS Based Switching)
    • Spectrum Analyzers
    • High Speed Data Acquisition Systems
    • High Speed Close-Loop Systems
    • Telecommunication
    • Ultra-Sound Detection

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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
ADS7891 ADS7056 ADS7279 ADS7890
14     14     14     14    
3000     2500     1000     125    
1     1     1     1    
Parallel     SPI     Serial     SPI    
-40 to 85     -40 to 125     -40 to 85     -40 to 85    
TQFP | 48     X2QFN | 8     QFN | 16
TSSOP | 16    
TQFP | 48    
13.15 | 1ku     2.00 | 1ku     4.20 | 1ku     11.50 | 1ku    
85     3.5     13.7     45    
48TQFP: 81 mm2: 9 x 9 (TQFP | 48)     8X2QFN: 2 mm2: 1.5 x 1.5 (X2QFN | 8)     16QFN: 16 mm2: 4 x 4 (QFN | 16)
16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)    
48TQFP: 81 mm2: 9 x 9 (TQFP | 48)    
SAR     SAR     SAR     SAR    
Pseudo-Differential
Single-Ended    
Single-Ended     Pseudo-Differential
Single-Ended    
Pseudo-Differential
Single-Ended    
   
   
   
   
Ext
Int    
Supply     Ext     Ext
Int    
Oscillator     Small Size     Daisy-Chainable
Oscillator    
Oscillator    
2.5     3.6     5.5     2.6    
0     0     0     0    
4.75     2.35     2.7     4.75    
5.25     3.6     5.5     5.25    
2.7     1.65     1.65     2.7    
5.25     3.6     5.5     5.25    
1.5     3     1     1.5    
78     74.5     85.7     77    
78.5     74.9     85.9     78    
-93     -85     -100.1     -95    
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