ADS7891 2.7-V to 5.25-V digital, 5-V analog, 14-bit 3-MSPS parallel ADC with internal reference | TI.com

ADS7891 (ACTIVE)

2.7-V to 5.25-V digital, 5-V analog, 14-bit 3-MSPS parallel ADC with internal reference

2.7-V to 5.25-V digital, 5-V analog, 14-bit 3-MSPS 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

Parametrics

Compare all products in Precision ADCs (<=10MSPS) Email Download to Excel
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
ADS7891 Order now 14     3000     1     Parallel     -40 to 85     TQFP | 48     13.15 | 1ku     85     48TQFP: 81 mm2: 9 x 9 (TQFP | 48)     SAR     Pseudo-Differential
Single-Ended    
   
Ext
Int    
Oscillator     2.5     0     4.75     5.25     2.7     5.25     1.5     78.5     -93     Catalog    
ADS7056 Order now 14     2500     1     SPI     -40 to 125     X2QFN | 8     2.00 | 1ku     3.5     8X2QFN: 2 mm2: 1.5 x 1.5 (X2QFN | 8)     SAR     Single-Ended    
   
Supply     Small Size     3.6     0     2.35     3.6     1.65     3.6     3     74.9     -85     Catalog    
ADS7279 Order now 14     1000     1     Serial     -40 to 85     QFN | 16
TSSOP | 16    
4.20 | 1ku     13.7     16QFN: 16 mm2: 4 x 4 (QFN | 16)
16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)    
SAR     Pseudo-Differential
Single-Ended    
   
Ext     Daisy-Chainable
Oscillator    
5.5     0     2.7     5.5     1.65     5.5     1     85.9     -100.1     Catalog    
ADS7890 Order now 14     1250     1     SPI     -40 to 85