ADS7844 12-Bit, 8-Channel Serial Output Sampling Analog-To-Digital Converter | TI.com

ADS7844 (ACTIVE) 12-Bit, 8-Channel Serial Output Sampling Analog-To-Digital Converter

 

Description

The ADS7844 is an 8-channel, 12-bit sampling analog-to-digital converter (ADC) with a synchronous serial interface. Typical power dissipation is 3mW at a 200kHz throughput rate and a +5V supply. The reference voltage (VREF) can be varied between 100mV and VCC, providing a corresponding input voltage range of 0V to VREF. The device includes a shutdown mode which reduces power dissipation to under 1µW. The ADS7844 is guaranteed down to 2.7V operation.

Low power, high speed, and on-board multiplexer make the ADS7844 ideal for battery- operated systems such as personal digital assistants, portable multichannel data loggers, and measurement equipment. The serial interface also provides low-cost isolation for remote data acquisition. The ADS7844 is available in a 20-lead QSOP package and the MAX147 equivalent 20-lead SSOP is guaranteed over the –40°C to +85°C temperature range.

Features

  • SINGLE SUPPLY: 2.7V to 5V
  • 8-CHANNEL SINGLE-ENDED OR 4-CHANNEL DIFFERENTIAL INPUT
  • UP TO 200kHz CONVERSION RATE
  • ±1 LSB MAX INL AND DNL
  • NO MISSING CODES
  • 72dB SINAD
  • SERIAL INTERFACE
  • 20-LEAD QSOP AND 20-LEAD SSOP PACKAGES
  • ALTERNATE SOURCE FOR MAX147
  • APPLICATIONS
    • DATA ACQUISITION
    • TEST AND MEASUREMENT
    • INDUSTRIAL PROCESS CONTROL
    • PERSONAL DIGITAL ASSISTANTS
    • BATTERY-POWERED SYSTEMS

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Parametrics

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Part number Order 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) SNR (dB) THD (Typ) (dB) Rating
ADS7844 Order now 12     200     8     Serial     -40 to 85     SSOP | 20
SSOP | 20    
3.11 | 1ku     1.8     20SSOP: 38 mm2: 5.3 x 7.2 (SSOP | 20)
20SSOP: 52 mm2: 6 x 8.65 (SSOP | 20)    
SAR     Pseudo-Differential
Single-Ended    
Multiplexed     Ext         5.25     0     2.7     5.25     1.9     5.5     2     73.1     -78     Catalog