ADS8634 12-Bit 4-Channel Bipolar SAR With Software-Selectable Input Ranges | TI.com

ADS8634 (ACTIVE)

12-Bit 4-Channel Bipolar SAR With Software-Selectable Input Ranges

 

Description

The ADS8634 and ADS8638 (ADS8634/8) are 12-bit analog-to-digital converters (ADCs) capable of measuring inputs up to ±10V at 1MSPS. Using a successive approximation register (SAR) core, these ADCs provide a sample-and-hold front-end with no latency in conversions. The ADS8634 includes an input multiplexer (mux) for measuring up to four inputs. The ADS8638 can measure up to eight inputs.

In addition to the input multiplexer, the ADS8634/8 feature an internal temperature sensor, voltage reference, and a digital comparator for setting alarm thresholds on each input; therefore, a minimal amount of external components are required. A simple SPI-compatible interface provides for communication and control. The digital supply operates from 5V all the way down to 1.8V for direct connection to a wide range of processors and controllers.

Ideal for demanding industrial measurement applications, the ADS8634/8 are fully specified over the extended industrial temperature range of –40°C to +125°C and are available in a small form-factor QFN-24 package.

Features

  • Selectable Input Range:
    ±10V, ±5V, ±2.5V, 0V to 10V, or
    0V to 5V
    Up to ±12V with External Reference
  • No Latent Conversions Up to 1MSPS
  • Outstanding Performance:
    12 Bits No Missing Codes
    INL: ±0.9LSB
    SNR: 71.8dB
  • Highly Integrated:
    4- or 8-Channel Input Mux
    Temperature Sensor
    Internal Voltage Reference
    Alarm Thresholds for Each Channel
  • Low Power:
    14.45mW at 1MSPS
    5.85mW at 0.1MSPS
    Flexible Power-Down Mode
  • SPI™-Compatible Serial Interface
  • Extended Temperature Range:
    –40°C to +125°C
  • Small Footprint: 4mm × 4mm QFN Package

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
ADS8634 ADS7950 ADS7951 ADS8638
12     12     12     12    
1000     1000     1000     1000    
4     4     8     8    
SPI     SPI     SPI     SPI    
-40 to 125     -40 to 125     -40 to 125     -40 to 125    
VQFN | 24     TSSOP | 30
VQFN | 24    
TSSOP | 30
VQFN | 24    
VQFN | 24    
2.42 | 1ku     2.07 | 1ku     2.70 | 1ku     2.60 | 1ku    
14.45     11.5     11.5     14.45    
24VQFN: 16 mm2: 4 x 4 (VQFN | 24)     30TSSOP: 50 mm2: 6.4 x 7.8 (TSSOP | 30)
24VQFN: 16 mm2: 4 x 4 (VQFN | 24)    
30TSSOP: 50 mm2: 6.4 x 7.8 (TSSOP | 30)
24VQFN: 16 mm2: 4 x 4 (VQFN | 24)    
24VQFN: 16 mm2: 4 x 4 (VQFN | 24)    
SAR     SAR     SAR     SAR    
Single-Ended     Single-Ended     Single-Ended     Single-Ended    
Multiplexed     Multiplexed     Multiplexed     Multiplexed    
Ext
Int    
Ext     Ext     Ext
Int    
Comparator    
   
   
Comparator    
10     5.25     5.25     10    
-10     0     0     -10    
2.7     2.7     2.7     2.7    
5.25     5.25     5.25     5.25    
1.65     1.7     1.7     1.65    
5.25     5.25     5.25     5.25    
1.5     1     1     1.5    
71.3     71.3     71.3     71.3    
71.8     71.7     71.7     71.8    
-81     -82     -82     -81    
Catalog     Catalog     Catalog     Catalog