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

18-Bit, 1MSPS, Serial Interface, microPower, True Differential-Input SAR ADC - ADS8881
Datasheet
ADS8881x 18-Bit, 1-MSPS, Serial Interface, microPower, Miniature, True-Differential Input, SAR Analog-to-Digital Converter datasheet (Rev. D)
 

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) (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
ADS8881 ADS8900B ADS8902B ADS8904B ADS8910B ADS8912B ADS8914B ADS8920B ADS8922B ADS8924B
18     20     20     20     18     18     18     16     16     16    
1000     1000     500     250     1000     500     250     1000     500     250    
1     1     1     1     1     1     1     1     1     1    
SPI     SPI     SPI     SPI     SPI     SPI     SPI     SPI     SPI     SPI    
-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    
VSON | 10
VSSOP | 10    		 VQFN | 24     VQFN | 24     VQFN | 24     VQFN | 24     VQFN | 24     VQFN | 24     VQFN | 24     VQFN | 24     VQFN | 24    
11.95 | 1ku     24.95 | 1ku     15.95 | 1ku     9.95 | 1ku     11.97 | 1ku     8.97 | 1ku     6.97 | 1ku     9.15 | 1ku     6.15 | 1ku     5.15 | 1ku    
5.5     21     16     14     21     16     14     21     16     14    
10VSON: 9 mm2: 3 x 3 (VSON | 10)
10VSSOP: 9 mm2: 3 x 3 (VSSOP | 10)    		 24VQFN: 16 mm2: 4 x 4 (VQFN | 24)     24VQFN: 16 mm2: 4 x 4 (VQFN | 24)     24VQFN: 16 mm2: 4 x 4 (VQFN | 24)     24VQFN: 16 mm2: 4 x 4 (VQFN | 24)     24VQFN: 16 mm2: 4 x 4 (VQFN | 24)     24VQFN: 16 mm2: 4 x 4 (VQFN | 24)     24VQFN: 16 mm2: 4 x 4 (VQFN | 24)     24VQFN: 16 mm2: 4 x 4 (VQFN | 24)     24VQFN: 16 mm2: 4 x 4 (VQFN | 24)    
SAR     SAR     SAR     SAR     SAR     SAR     SAR     SAR     SAR     SAR    
Differential     Differential     Differential     Differential     Differential     Differential     Differential     Differential     Differential     Differential