ADS8914B 18-Bit, 250-kSPS, 1-Ch SAR ADC with Internal VREF Buffer, Internal LDO and Enhanced SPI Interface | TI.com

ADS8914B (ACTIVE) 18-Bit, 250-kSPS, 1-Ch SAR ADC with Internal VREF Buffer, Internal LDO and Enhanced SPI Interface

 

Description

The ADS8910B, ADS8912B, and ADS8914B (ADS891xB) belong to a family of pin-to-pin compatible, high-speed, single-channel, high-precision, 18-bit successive approximation register (SAR) analog-to-digital convertors (ADCs) with an integrated reference buffer and integrated low-dropout regulator (LDO). The device family includes the ADS890xB (20-bit) and ADS892xB (16-bit) resolution variants.

The ADS891xB boost analog performance while maintaining high-resolution data transfer by using TI’s enhanced-SPI feature. Enhanced-SPI enables the ADS89xxB to achieve high throughput at lower clock speeds, thereby simplifying the board layout and lowering system cost. Enhanced-SPI also simplifies clocking-in of data, thereby making this device an excellent choice for applications involving FPGAs, DSPs. The ADS89xxB is compatible with a standard SPI Interface.

The ADS891xB has an internal data parity feature that can be appended to the ADC data output. ADC data validation by the host, using parity bits, improves system reliability.

Features

  • Resolution: 18-Bits
  • High Sample Rate With No Latency Output:
    • ADS8910B: 1-MSPS
    • ADS8912B: 500-kSPS
    • ADS8914B: 250-kSPS
  • Integrated LDO Enables Single-Supply Operation
  • Low-Power Reference Buffer With No Droop
  • Excellent AC and DC Performance:
    • SNR: 102.5-dB, THD: –125-dB
    • INL: ±0.5-LSB
    • DNL: ±0.2-LSB, 18-Bit No-Missing-Codes
  • Wide Input Range:
    • Unipolar Differential Input Range: ±VREF
    • VREF Input Range: 2.5-V to 5-V
  • Single-Supply, Low-Power Operation
    (Includes Internal Reference Buffer and LDO)
    • ADS8910B : 21-mW at 1-MSPS
    • ADS8912B : 16-mW at 500-kSPS
    • ADS8914B : 14-mW at 250-kSPS
  • Enhanced-SPI Digital Interface
    • Interface SCLK: 20-MHz at 1-MSPS
    • Configurable Data Parity Output
  • Extended Temperature Range: –40°C to +125°C
  • Small Footprint: 4-mm × 4-mm VQFN

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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
ADS8914B Order now 18     250     1     Enhanced SPI
SPI    
-40 to 125     VQFN | 24     6.97 | 1ku     14     24VQFN: 16 mm2: 4 x 4 (VQFN | 24)     SAR     Differential    
   
Ext     Daisy-Chainable
Oscillator    
5     -5     3     5.5     1.65     5.5     1.5     102.5     -125     Catalog    
ADS8881 Order now 18     1000     1     SPI     -40 to 85
0 to 70    
VSON | 10
VSSOP | 10    
11.95 | 1ku     5.5     10VSON: 9 mm2: 3 x 3 (VSON | 10)
10VSSOP: 9 mm2: 3 x 3 (VSSOP | 10)    
SAR     Differential    
   
Ext     Daisy-Chainable
Oscillator
Small Size    
5     -5     2.7     3.6     1.65     3.6     2     100     -115     Catalog    
ADS8900B Order now 20     1000     1     Enhanced SPI
SPI    
-40 to 125     VQFN | 24     24.95 | 1ku     21     24VQFN: 16 mm2: 4 x 4 (VQFN | 24)     SAR     Differential    
   
Ext     Daisy-Chainable
Oscillator    
5     -5     3     5.5     1.65     5.5     3.9     104.5     -125     Catalog