ADS8684 16-Bit 500kSPS 4-Channel SAR ADC With Bipolar Inputs Off 5V Supply | TI.com

ADS8684 (ACTIVE) 16-Bit 500kSPS 4-Channel SAR ADC With Bipolar Inputs Off 5V Supply

 

Description

The ADS8684 and ADS8688 are 4- and 8-channel, integrated data acquisition systems based on a 16-bit successive approximation (SAR) analog-to-digital converter (ADC), operating at a throughput of 500 kSPS. The devices feature integrated analog front-end circuitry for each input channel with overvoltage protection up to ±20 V, a 4- or 8-channel multiplexer with automatic and manual scanning modes, and an on-chip, 4.096-V reference with low temperature drift. Operating on a single 5-V analog supply, each input channel on the devices can support true bipolar input ranges of ±10.24 V, ±5.12 V, and ±2.56 V, as well as unipolar input ranges of 0 V to 10.24 V and 0 V to 5.12 V. The gain of the analog front-end for all input ranges is accurately trimmed to ensure a high dc precision. The input range selection is software-programmable and independent for each channel. The devices offer a 1-MΩ constant resistive input impedance irrespective of the selected input range.

The ADS8684 and ADS8688 offer a simple SPI-compatible serial interface to the digital host and also support daisy-chaining of multiple devices. The digital supply operates from 1.65 V to 5.25 V, enabling direct interface to a wide range of host controllers.

Features

  • 16-Bit ADC with Integrated Analog Front-End
  • 4-, 8-Channel MUX with Auto and Manual Scan
  • Channel-Independent Programmable Input Ranges:
    • Bipolar: ±10.24 V, ±5.12 V, and ±2.56 V
    • Unipolar: 10.24 V, 5.12 V
  • 5-V Analog Supply: 1.65-V to 5-V I/O Supply
  • Constant Resistive Input Impedance: 1 MΩ
  • Input Overvoltage Protection: Up to ±20 V
  • On-Chip, 4.096-V Reference with Low Drift
  • Excellent Performance:
    • 500-kSPS Aggregate Throughput
    • DNL: ±0.5 LSB; INL: ±0.75 LSB
    • Low Drift for Gain Error and Offset
    • SNR: 92 dB; THD: –102 dB
    • Low Power: 65 mW
  • AUX Input → Direct Connection to ADC Inputs
  • SPI™-Compatible Interface with Daisy-Chain
  • –40°C to 125°C Industrial Temperature Range
  • TSSOP-38 Package (9.7 mm × 4.4 mm)

Parametrics

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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
ADS8684 Order now 16     500     4     SPI     -40 to 125     TSSOP | 38     5.90 | 1ku     65     38TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 38)     SAR     Single-Ended     Multiplexed     Ext
Int    
Daisy-Chainable
Oscillator
Over-Voltage Protection
PGA    
10.24     -10.24     4.75     5.25     1.65     5.25     2     92     -102     Catalog    
ADS8664 Order now 12     500     4     SPI     -40 to 125     TSSOP | 38     2.80 | 1ku     65     38TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 38)     SAR     Single-Ended     Multiplexed     Int     Daisy-Chainable
Oscillator
Over-Voltage Protection
PGA    
10.24     -10.24     4.75     5.25     1.65     5.25     0.5     73.8     -95     Catalog    
ADS8668 Order now 12     500     8     SPI     -40 to 125     TSSOP | 38     4.00 | 1ku     65     38TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 38)     SAR     Single-Ended     Multiplexed     Int     Daisy-Chainable
Oscillator
Over-Voltage Protection
PGA    
10.24     -10.24     4.75     5.25     1.65     5.25     0.5     73.8     -95     Catalog    
ADS8674 Order now 14