ADS8881 18-Bit, 1MSPS, Serial Interface, microPower, True Differential-Input SAR ADC | TI.com

ADS8881 (ACTIVE)

18-Bit, 1MSPS, Serial Interface, microPower, True Differential-Input SAR ADC

 

Description

The ADS8881 is an 18-bit, 1-MSPS, true-differential input, analog-to-digital converter (ADC). The device operates with a 2.5-V to 5-V external reference, offering a wide selection of signal ranges without additional input signal scaling. The reference voltage setting is independent of, and can exceed, the analog supply voltage (AVDD).

The device offers an SPI-compatible serial interface that also supports daisy-chain operation for cascading multiple devices. An optional busy-indicator bit makes synchronizing with the digital host easy.

The device supports unipolar, true-differential analog input signals with a differential input swing of –VREF to VREF. This true-differential analog input structure allows for a common-mode voltage of any value in the range of 0 V to VREF (when both inputs are within the operating input range of –0.1 V to VREF + 0.1 V).

Device operation is optimized for very low-power operation. Power consumption directly scales with speed. This feature makes the ADS8881 excellent for lower-speed applications.

Features

  • Sample Rate: 1 MHz
  • No Latency Output
  • Unipolar, True-Differential Input Range:
    –VREF to +VREF
  • Wide Common-Mode Voltage Range:
    0 V to VREF with 90-dB CMRR (min)
  • SPI™-Compatible Serial Interface with
    Daisy-Chain Option
  • Excellent AC and DC Performance:
    • ADS8881C:
      INL: ±1 LSB (typ), ±2.0 LSB (max)
      DNL: ±1.0 LSB (max), 18-Bit NMC
      SNR: 100 dB, THD: –115 dB
    • ADS8881I:
      INL: ±1.5 LSB (typ), ±3.0 LSB (max)
      DNL: +1.5 and –1 LSB (max), 18-Bit NMC
      SNR: 100 dB, THD: –115 dB
  • Wide Operating Range:
    • AVDD: 2.7 V to 3.6 V
    • DVDD: 2.7 V to 3.6 V
      (Independent of AVDD)
    • REF: 2.5 V to 5 V (Independent of AVDD)
    • Operating Temperature:
      ADS8881C : 0°C to +70°C
      ADS8881I : –40°C to +85°C
  • Low-Power Dissipation:
    • 5.5 mW at 1 MSPS
    • 0.55 mW at 100 kSPS
    • 55 µW at 10 kSPS
  • Power-Down Current (AVDD): 50 nA
  • Full-Scale Step Settling to 18 Bits: 290 ns
  • Packages: MSOP-10 and VSON-10

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
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    
ADS8902B Order now 20     500     1     Enhanced SPI
SPI    
-40 to 125     VQFN | 24     15.95 | 1ku     16     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    
ADS8904B