ADS7890 14-Bit, 1.25MSPS, 1-Ch SAR ADC with Serial Interface and Internal Voltage Reference | TI.com

ADS7890 (ACTIVE)

14-Bit, 1.25MSPS, 1-Ch SAR ADC with Serial Interface and Internal Voltage Reference

 

Description

The ADS7890 is a 14-bit 1.25-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 serial SPI or DSP compatible interface. 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. The device operates at lower power when used at lower conversion rates because of the nap feature. The device is available in a 48-pin TQFP package.

Features

  • 1.25 MHz Sample Rate, 14-Bit Resolution
  • Zero Latency
  • Unipolar, Pseudo Differential Input, Range:
    • 0 V to 2.5 V
  • SPI™ Compatible Serial Interface
  • 77.5 dB SNR and –95 dB THD at 0.5 MHz I/P
  • Power Dissipation 45 mW at 1.25 MSPS
  • Nap Mode (10 mW Power Dissipation)
  • Power Down (10 µW)
  • Internal Reference
  • Internal Reference Buffer
  • 48-Pin TQFP Package
  • APPLICATIONS
    • Optical Networking (DWDM, MEMS Based Switching)
    • Spectrum Analyzers
    • High Speed Data Acquisition Systems
    • High Speed Close-Loop Systems
    • Telecommunication

SPI is a trademark of Motorola, Inc.

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
ADS7890 Order now 14     1250     1     SPI     -40 to 85     TQFP | 48     11.50 | 1ku     45     48TQFP: 81 mm2: 9 x 9 (TQFP | 48)     SAR     Pseudo-Differential
Single-Ended    
   
Ext
Int    
Oscillator     2.6     0     4.75     5.25     2.7     5.25     1.5     78     -95     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    
ADS7891 Order now 14     3000     1     Parallel     -40 to 85