AD7856:  5 V Single-Supply, 8-Channel, 14-Bit, 285 kSPS, Serial Sampling ADC

The AD7856 is a high speed, low power, 14-bit Analog-to-Digital Converter (ADC) that operates from a single 5 V power supply. The ADC powers up with a set of default conditions at which time it can ...More

AD7856:  5 V Single-Supply, 8-Channel, 14-Bit, 285 kSPS, Serial Sampling ADC

Product Description

The AD7856 is a high speed, low power, 14-bit Analog-to-Digital Converter (ADC) that operates from a single 5 V power supply. The ADC powers up with a set of default conditions at which time it can be operated as a read only ADC. The ADC contains self-calibration and system calibration options to ensure accurate operation over time and temperature; and it has a number of power-down options for low power applications.

The AD7856 is capable of 285 kHz throughput rate. The input track-and-hold acquires a signal in 500 ns and features a pseudo-differential sampling scheme. The AD7856 voltage range is 0 to VREF with both straight binary and 2s complement output coding. Input signal range is to the supply and the part is capable of converting full power signals to 20 MHz.

CMOS construction ensures low power dissipation of typically 5.4 mW for normal operation and 3.6 µW in power-down mode. The part is available in 24-pin, 0.3 inch-wide dual-in-line package (DIP), 24-lead small outline (SOIC) and 24-lead small shrink outline (SSOP) packages.

Features

  • Single 5 V Supply
  • 285 kSPS Throughput Rate
  • Self- and System Calibration with Autocalibration on Power-Up
  • Eight Single-Ended or Four Pseudo-Differential Inputs
  • Low Power: 60 mW Typ
  • Automatic Power-Down After Conversion (2.5 µW Typ)
  • Flexible Serial Interface: 8051/SPI®/QSPI™/µP Compatible
  • 24-Lead DIP, SOIC and SSOP Packages

Diagrams

AD7856 Diagram
Functional Block Diagram for AD7856

Specifications

Resolution (Bits) 14bit
T-Put Rate 285kSPS
# Chan 8
Supply V Single(+5)
Pwr Diss (max) 89.25mW
Interface Ser,SPI
Ain Range (Vref) p-p,Uni (Vref)
SNR (dB) 78dB
Pkg Type DIP,SOIC,SOP

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Part# Res Throughput Rate # of Inputs Operating Pwr Diss
AD7856 14 285KSPS 8 89.25mW
AD7928 12 1MSPS 8 13.5mW
AD7938 12 1.5MSPS 8 16mW
AD7918 10 1MSPS 8 13.5mW
AD7367 14 1MSPS 4 88.7mW
AD7812 10 350KSPS 8 10.5mW
AD7939 10 1.5MSPS 8 16mW
AD7367-5 14 500KSPS