ADS8695 18-Bit 500kSPS Single-Supply SAR ADC Data Acquisition System With Programmable Bipolar Input Ranges | TI.com

ADS8695 (ACTIVE)

18-Bit 500kSPS Single-Supply SAR ADC Data Acquisition System With Programmable Bipolar Input Ranges

18-Bit 500kSPS Single-Supply SAR ADC Data Acquisition System With Programmable Bipolar Input Ranges - ADS8695
 

Description

The ADS8691, ADS8695, and ADS8699 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

  • 18-Bit ADC with Integrated Analog Front-End
  • High Speed:
    • ADS8691: 1 MSPS
    • ADS8695: 500 kSPS
    • ADS8699: 100 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: ±0.6 LSB; INL: ±1.75 LSB
    • SNR: 92.5 dB; THD: –110 dB
  • ALARM → High, Low Thresholds per Channel
  • multiSPI™ Interface with Daisy-Chain
  • Extended Industrial Temperature Range:
    –40°C to +125°C

View more

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)
ADS8695 ADS8661 ADS8665 ADS8671 ADS8675 ADS8681 ADS8685 ADS8689 ADS8691 ADS8699
18     12     12     14     14     16     16     16     18     18    
500     125     500     1000     500     1000     500     100     1000     100    
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 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 | 16     TSSOP | 16     TSSOP | 16     TSSOP | 16     TSSOP | 16     TSSOP | 16
WQFN | 16    
TSSOP | 16     TSSOP | 16     TSSOP | 16     TSSOP | 16    
4.60 | 1ku     2.00 | 1ku     1.50 | 1ku     2.85 | 1ku     2.15 | 1ku     4.10 | 1ku     3.10 | 1ku     2.40 | 1ku     5.30 | 1ku     3.20 | 1ku    
29     36     25     34     27     42     29     21     42     21    
16TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 16)     16TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 16)     16TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 16)     16TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 16)     16TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 16)     16TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 16)
16WQFN: 16 mm2: 4 x 4 (WQFN | 16)    
16TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 16)     16TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 16)     16TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 16)     16TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 16)    
SAR     SAR     SAR     SAR     SAR     SAR     SAR     SAR     SAR     SAR    
Single-Ended     Single-Ended     Single-Ended     Single-Ended     Single-Ended     Single-Ended     Single-Ended     Single-Ended     Single-Ended     Single-Ended    
N/A     N/A     N/A     N/A