18-Bit, 1MSPS, Serial Interface, microPower, True Differential-Input SAR ADC - ADS8881

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

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Parametrics Compare all products in Precision ADCs (<=10MSPS)

 
Resolution (Bits)
Sample Rate (max) (SPS)
# Input Channels
Input Type
Power Consumption (Typ) (mW)
Input Range (Min) (V)
Input Range (Max) (V)
Interface
Features
Analog Voltage AVDD (Min) (V)
Analog Voltage AVDD (Max) (V)
Architecture
Operating Temperature Range (C)
Pin/Package
THD (Typ) (dB)
SNR (dB)
Reference Mode
ADS8881 ADS8900B ADS8902B ADS8904B ADS8910B ADS8912B ADS8914B ADS8920B ADS8922B ADS8924B
18    20    20    20    18    18    18    16    16    16   
1MSPS    1MSPS    500kSPS    250kSPS    1MSPS    500kSPS    250kSPS    1MSPS    500kSPS    250kSPS   
1    1    1    1    1    1    1    1    1    1   
Differential    Differential    Differential    Differential    Differential    Differential    Differential    Differential    Differential    Differential   
5.5    21    16    14    21    16    14    21    16    14   
-5    -5    -5    -5    -5    -5    -5    -5    -5    -5   
5    5    5    5    5    5    5    5    5    5   
SPI    SPI    SPI    SPI    SPI    SPI    SPI    SPI    SPI    SPI   
Daisy-Chainable
Oscillator   
Daisy-Chainable
Oscillator   
Daisy-Chainable
Oscillator   
Daisy-Chainable
Oscillator   
Daisy-Chainable
Oscillator   
Daisy-Chainable
Oscillator   
Daisy-Chainable
Oscillator   
Daisy-Chainable
Oscillator   
Daisy-Chainable
Oscillator   
Daisy-Chainable
Oscillator   
2.7    3    3    3    3    3    3    3    3    3   
3.6    5.5    5.5    5.5    5.5    5.5    5.5    5.5    5.5    5.5   
SAR    SAR    SAR    SAR    SAR    SAR    SAR    SAR    SAR    SAR   
-40 to 85
0 to 70   
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
10VSON
10VSSOP   
24VQFN    24VQFN    24VQFN    24VQFN    24VQFN    24VQFN    24VQFN    24VQFN    24VQFN   
-115    -125    -125    -125    -125    -125    -125    -125    -125    -125   
100    104.5    104.5    104.5    102.5    102.5    102.5    96.8    96.8    96.8   
Ext    Ext    Ext    Ext    Ext    Ext    Ext    Ext    Ext    Ext