ADS7890 2.7V-5.25V Digital, 5V Analog, 14-Bit 1.25MSPS Serial ADC With Internal Reference | TI.com

ADS7890 (ACTIVE)

2.7V-5.25V Digital, 5V Analog, 14-Bit 1.25MSPS Serial ADC With Internal 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.

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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
ADS7890 ADS7056 ADS7279 ADS7891
14     14     14     14    
125     2500     1000     3000    
1     1     1     1    
SPI     SPI     Serial     Parallel    
-40 to 85     -40 to 125     -40 to 85     -40 to 85    
TQFP | 48     X2QFN | 8     QFN | 16
TSSOP | 16    
TQFP | 48    
11.50 | 1ku     2.00 | 1ku     4.20 | 1ku     13.15 | 1ku    
45     3.5     13.7     85    
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    
2.6     3.6     5.5     2.5    
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    
77     74.5     85.7     78    
78     74.9     85.9     78.5    
-95     -85     -100.1     -93    
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