12-Bit, 500kSPS Single-Supply SAR ADC Data Acquisition System with Programmable - ADS8665

ADS8665 (ACTIVE)

12-Bit, 500kSPS Single-Supply SAR ADC Data Acquisition System with Programmable

 

Description

The ADS8661 and ADS8665 devices belong to a family of integrated data acquisition system based on a successive approximation (SAR) analog-to-digital converter (ADC). The devices feature a high-speed, high-precision SAR ADC, integrated analog front-end (AFE) input driver circuit, overvoltage protection circuit up to ±20 V, and an on-chip 4.096-V reference with extremely low temperature drift.

The devices operate on a single 5-V analog supply, but support true bipolar input ranges of ±12.288 V, ±6.144 V, ±10.24 V, ±5.12 V, and ±2.56 V, as well as unipolar input ranges of 0 V to 12.288 V, 0 V to 10.24 V, 0 V to 6.144 V, and 0 V to 5.12 V. The gain and offset errors are accurately trimmed within the specified values for each input range to ensure high dc precision. The input range selection is done by software programming of the device internal registers. The devices offer a high resistive input impedance (≥ 1 MΩ) irrespective of the selected input range.

The multiSPI digital interface is backward-compatible to the traditional SPI protocol. Additionally, configurable features simplify interface to a wide range of host controllers.

Features

  • 12-Bit ADC with Integrated Analog Front-End
  • High Speed:
    • ADS8661: 1.25 MSPS
    • ADS8665: 500 kSPS
  • Software Programmable Input Ranges:
    • Bipolar Ranges: ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, and ±2.56 V
    • Unipolar Ranges: 0 V–12.288 V, 0 V–10.24 V, 0 V–6.144 V, and 0 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:
    • DNL: ±0.1 LSB; INL: ±0.15 LSB
    • SNR: 74 dB; THD: –102 dB
  • ALARM → High, Low Thresholds per Channel
  • multiSPI™ Interface with Daisy-Chain
  • Extended Industrial Temperature Range:
    –40°C to +125°C

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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
ADS8665 ADS8661 ADS8671 ADS8675 ADS8681 ADS8685 ADS8689 ADS8691 ADS8695 ADS8699
12    12    14    14    16    16    16    18    18    18   
500000    1250000    1000000    500000    1000000    500000    100000    1000000    500000    100000   
1    1    1    1    1    1    1    1    1    1   
Single-Ended    Single-Ended    Single-Ended    Single-Ended    Single-Ended    Single-Ended    Single-Ended    Single-Ended    Single-Ended    Single-Ended   
25    36    34    27    42    29    21    42    29    21   
-12.288    -12.288    -12.288    -12.288    -12.288    -12.288    -12.288    -12.288    -12.288    -12.288   
12.288    12.288    12.288    12.288    12.288    12.288    12.288    12.288    12.288    12.288   
SPI    SPI    SPI    SPI    SPI    SPI    SPI    SPI    SPI    SPI   
Oscillator
Over-Voltage Protection
PGA   
Oscillator
Over-Voltage Protection
PGA   
Oscillator
Over-Voltage Protection
PGA   
Oscillator
Over-Voltage Protection
PGA   
Oscillator
Over-Voltage Protection
PGA   
Oscillator
Over-Voltage Protection
PGA   
Oscillator
Over-Voltage Protection
PGA   
Oscillator
Over-Voltage Protection
PGA   
Oscillator
Over-Voltage Protection
PGA   
Oscillator
Over-Voltage Protection
PGA   
4.75    4.75    4.75    4.75    4.75    4.75    5.25    4.75    4.75    4.75   
5.25    5.25    5.25    5.25    5.25    5.25    4.75    5.25    5.25    5.25   
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   
16TSSOP
16WQFN   
16TSSOP
16WQFN   
16TSSOP
16WQFN   
16TSSOP
16WQFN   
16TSSOP
16WQFN   
16TSSOP
16WQFN   
16TSSOP
16WQFN   
16TSSOP
16WQFN   
16TSSOP
16WQFN   
16TSSOP
16WQFN   
-102    -102    -105    -105    -102    -112    -112    -110    -110    -110   
73.5    73.5    84.5    84.5    90.5    92    92    92.5    92.5    92.5   
Ext
Int   
Ext
Int   
Ext
Int   
Ext
Int   
Ext
Int   
Ext
Int   
Ext
Int   
Ext
Int   
Int    Ext
Int   

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