16-Bit, 500-kSPS, 8-Channel, Single-Supply, SAR ADCs with Bipolar Input Ranges - ADS8688

ADS8688 (ACTIVE)

16-Bit, 500-kSPS, 8-Channel, Single-Supply, SAR ADCs with Bipolar Input Ranges

 

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)

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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
ADS8688 ADS8584S ADS8586S ADS8588S ADS8664 ADS8668 ADS8674 ADS8678 ADS8684 ADS8684A ADS8688A ADS8694
16    16    16    16    12    12    14    14    16    16    16    18   
500kSPS    330 kSPS    250 kSPS    200 kSPS    500kSPS    500kSPS    500kSPS    500kSPS    500kSPS    500kSPS    500kSPS    500kSPS   
8    4    6    8    4    8    4    8    4    4    8    4   
Single-Ended    Single-Ended    Single-Ended    Single-Ended    Single-Ended    Single-Ended    Single-Ended    Single-Ended    Single-Ended    Single-Ended    Single-Ended    Single-Ended   
65    54.5    73    88.5    65    65    65    65    65    65    65    65   
-10.24    -10    -10    -10    -10.24    -10.24    -10.24    -10.24    -10.24    -10.24    -10.24    -10.24   
10.24    10    10    10    10.24    10.24    10.24    10.24    10.24    10.24    10.24    10.24   
SPI    Byte-Wide
Parallel
SPI   
Byte-Wide
Parallel
SPI   
Byte-Wide
Parallel
SPI   
SPI    SPI    SPI    SPI    SPI    SPI    SPI    SPI   
Daisy-Chainable
Oscillator
Over-Voltage Protection
PGA   
Oscillator
Over-Voltage Protection
PGA   
Oscillator
Over-Voltage Protection
PGA   
Oscillator
Over-Voltage Protection
PGA   
Daisy-Chainable
Oscillator
Over-Voltage Protection
PGA   
Daisy-Chainable
Oscillator
Over-Voltage Protection
PGA   
Daisy-Chainable
Oscillator
Over-Voltage Protection
PGA   
Daisy-Chainable
Oscillator
Over-Voltage Protection
PGA   
Daisy-Chainable
Oscillator
Over-Voltage Protection
PGA   
Daisy-Chainable
Oscillator
Over-Voltage Protection
PGA   
Daisy-Chainable
Oscillator
Over-Voltage Protection
PGA   
Daisy-Chainable
Oscillator
Over-Voltage Protection
PGA   
4.75    4.75    4.75    4.75    4.75    4.75    4.75    4.75    4.75    4.75    4.75    4.75   
5.25    5.25    5.25    5.25    5.25    5.25    5.25    5.25    5.25    5.25    5.25    5.25   
SAR    SAR    SAR    SAR    SAR    SAR    SAR    SAR    SAR    SAR    SAR    SAR   
-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    -40 to 125    -40 to 125    -40 to 125   
38TSSOP    64LQFP    64LQFP    64LQFP    38TSSOP    38TSSOP    38TSSOP    38TSSOP    38TSSOP    38TSSOP    38TSSOP    38TSSOP   
-102    -114    -114    -114    -95    -95    -100    -100    -102    -102    -102    -106   
92    92.7    92.7    92.7    73.8    73.8    85    85    92    92    92    93.5   
Ext
Int   
Ext
Int   
Ext
Int   
Ext
Int   
Int    Int    Int    Int    Ext
Int   
Int    Ext
Int   
Int