ADS8904B 20-Bit, 250-kSPS, SAR ADC with Internal Reference Buffer, LDO & multiSPI™ Digital Interface | TI.com

ADS8904B (ACTIVE)

20-Bit, 250-kSPS, SAR ADC with Internal Reference Buffer, LDO & multiSPI™ Digital Interface

 

Description

The ADS8900B, ADS8902B, and ADS8904B (ADS890xB) belong to a family of pin-to-pin compatible, high-speed, single-channel, high-precision, 20-bit successive-approximation-register (SAR) analog-to-digital converters (ADCs) with an integrated reference buffer and integrated low-dropout regulator (LDO). The device family includes the ADS891xB (18-bit) and ADS892xB (16-bit) resolution variants.

The ADS89xxB boosts analog performance while maintaining high-resolution data transfer by using TI’s Enhanced-SPI feature. Enhanced-SPI enables ADS89xxB in achieving high throughput at lower clock speeds, there by simplifying the board layout and lowering system cost. Enhanced-SPI also simplifies the host’s clocking-in of data there by making it ideal for applications involving FPGAs, DSPs. ADS89xxB is compatible with standard SPI Interface.

The ADS89xxB has an internal data parity feature which can be appended to the ADC data output. ADC data validation by the host, using parity bits, improves system reliability.

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
  • Low Power Reference Buffer with No Droop
  • Excellent AC and DC Performance:
    • SNR: 104.5-dB, THD: –125-dB
    • DNL: ±0.2-ppm, 20-Bit No-Missing-Codes
    • INL: ±1-ppm
  • Wide Input Range:
    • Unipolar Differential Input Range: ±VREF
    • VREF Input Range: 2.5-V to 5-V
  • Enhanced-SPI Digital Interface
    • Interface SCLK : 22-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 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
ADS8904B ADS8881 ADS8900B ADS8902B ADS8910B ADS8912B ADS8914B ADS8920B ADS8922B ADS8924B
20     18     20     20     18     18     18     16     16     16    
250     1000     1000     500     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 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    
VQFN | 24     VSON | 10
VSSOP | 10    
VQFN | 24     VQFN | 24     VQFN | 24     VQFN | 24     VQFN | 24     VQFN | 24     VQFN | 24     VQFN | 24    
9.95 | 1ku     11.95 | 1ku     24.95 | 1ku     15.95 | 1ku     11.97 | 1ku     8.97 | 1ku     6.97 | 1ku     9.15 | 1ku     6.15 | 1ku     5.15 | 1ku    
14     5.5     21     16     21     16     14     21     16     14    
24VQFN: 16 mm2: 4 x 4 (VQFN | 24)     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)    
SAR     SAR     SAR     SAR     SAR     SAR     SAR     SAR     SAR     SAR    
Differential     Differential     Differential     Differential     Differential     Differential     Differential     Differential     Differential     Differential