ADS8688 16-Bit 500kSPS 8-Channel Single-Supply SAR ADC With Bipolar Input Ranges | TI.com

ADS8688 (ACTIVE)

16-Bit 500kSPS 8-Channel Single-Supply SAR ADC With Bipolar Input Ranges

16-Bit 500kSPS 8-Channel Single-Supply SAR ADC With Bipolar Input Ranges - ADS8688
 

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) (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
Sample Rate (Max) (MSPS)
ADS8688 ADS8584S ADS8586S ADS8588S ADS8664 ADS8668 ADS8674 ADS8678 ADS8684 ADS8684A ADS8688A ADS8694
16     16     16     16     12     12     14     14     16     16     16     18    
500     330     250     200     500     500     500     500     500     500     500     500    
8     4     6     8     4     8     4     8     4     4     8     4    
SPI     Byte-Wide
Parallel
SPI    
Byte-Wide
Parallel
SPI    
Byte-Wide
Parallel
SPI    
SPI     SPI     SPI     SPI     SPI     SPI     SPI     SPI    
-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    
TSSOP | 38     LQFP | 64     LQFP | 64     LQFP | 64     TSSOP | 38     TSSOP | 38     TSSOP | 38     TSSOP | 38     TSSOP | 38     TSSOP | 38     TSSOP | 38     TSSOP | 38    
8.45 | 1ku     8.00 | 1ku     10.00 | 1ku     13.00 | 1ku     2.80 | 1ku     4.00 | 1ku     4.25 | 1ku     6.00 | 1ku     5.90 | 1ku     6.40 | 1ku     9.00 | 1ku     8.30 | 1ku    
65     54.5     73     88.5     65     65     65     65     65     65     65     65    
38TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 38)     64LQFP: 144 mm2: 12 x 12 (LQFP | 64)     64LQFP: 144 mm2: 12 x 12 (LQFP | 64)     64LQFP: 144 mm2: 12 x 12 (LQFP | 64)     38TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 38)     38TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 38)     38TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 38)     38TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 38)     38TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 38)     38TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 38)     38TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 38)     38TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 38)    
SAR     SAR     SAR     SAR     SAR     SAR