20-Bit, 500-kSPS, SAR ADC with Internal Reference Buffer, Internal LDO & multiSPI™ Digital Interface - ADS8902B

ADS8902B (ACTIVE)

20-Bit, 500-kSPS, SAR ADC with Internal Reference Buffer, Internal LDO & multiSPI™ Digital Interface

 

Description

The ADS8900B, ADS8902B, and ADS8904B (ADS890xB) belong to a family of pin-to-pin compatible, high-speed, high-precision successive-approximation-register (SAR) analog-to-digital convertors (ADCs) with an integrated reference buffer and integrated low-dropout regulator (LDO). These devices support unipolar, fully differential, analog input signals with ±1-ppm INL and 104.5-dB SNR specifications under typical operating conditions.

The integrated LDO enables single-supply operation with low power consumption. The integrated reference buffer supports burst-mode data acquisition with 20-bit precision for the first sample. External reference voltages in the range 2.5 V to 5 V are supported, offering a wide selection of input ranges without additional input scaling.

The integrated multiSPI digital interface is backward-compatible to the traditional SPI protocol. Additionally, configurable features simplify board layout, timing, and firmware, and support high throughput at lower clock speeds. The multiSPI digital interface allows for easy interface with a variety of microcontrollers, digital signal processors (DSPs), and field-programmable gate arrays (FPGAs).

The ADS890xB family is offered in a space-saving, 4-mm × 4-mm, VQFN package, and is specified over the extended temperature range of –40°C to +125°C.

Features

  • Resolution: 20 Bits
  • High Sample Rate With No Latency Output:
    • ADS8900B: 1 MSPS
    • ADS8902B: 500 kSPS
    • ADS8904B: 250 kSPS
  • Integrated LDO Enables Low-Power, Single-Supply Operation
  • Burst-Mode Operation With Precise First Sample
  • Excellent AC and DC Performance:
    • SNR: 104.5 dB, THD: –125 dB
    • DNL: ±0.5 ppm (Max), 20-Bit NMC
    • INL: ±1 ppm (Typ)
      • ±2 ppm (Max), 0°C to 60°C
      • ±2.75 ppm (Max), –40°C to +85°C
      • ±3.75 ppm (Max), –40°C to +125°C
  • Wide Input Range:
    • Unipolar Differential Input Range: ±VREF
    • VREF Input Range: 2.5 V to 5 V
  • multiSPI™ Digital Interface
  • Extended Temperature Range: –40°C to +125°C
  • Small Footprint: 4-mm × 4-mm VQFN

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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
Integrated 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
ADS8902B ADS8881 ADS8900B ADS8904B ADS8910B ADS8912B ADS8914B ADS8920B ADS8922B ADS8924B
20    18    20    20    18    18    18    16    16    16   
500kSPS    1MSPS    1MSPS    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   
16    5.5    21    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   
3    2.7    3    3    3    3    3    3    3    3   
5.5    3.6    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 125    -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   
24VQFN    10VSON
10VSSOP   
24VQFN    24VQFN    24VQFN    24VQFN    24VQFN    24VQFN    24VQFN    24VQFN   
-125    -115    -125    -125    -125    -125    -125    -125    -125    -125   
104.5    100    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