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AD7715:  3 V/5 V, 450 µA, 16-Bit Sigma-Delta ADC

The AD7715 is a complete analog front end for low frequency measurement applications. The part can accept low level input signals directly from a transducer and outputs a serial digital word. It employs a sigma-delta conversion technique to realize up to 16 bits of no missing codes performance. The input signal is applied to a proprietary programmable gain front end based around an analog ...More

AD7715:  3 V/5 V, 450 µA, 16-Bit Sigma-Delta ADC

Product Description

The AD7715 is a complete analog front end for low frequency measurement applications. The part can accept low level input signals directly from a transducer and outputs a serial digital word. It employs a sigma-delta conversion technique to realize up to 16 bits of no missing codes performance. The input signal is applied to a proprietary programmable gain front end based around an analog modulator. The modulator output is processed by an on-chip digital filter. The first notch of this digital filter can be programmed via the on-chip control register allowing adjustment of the filter cutoff and output update rate.

The AD7715 features a differential analog input as well as a differential reference input. It operates from a single supply (+3 V or +5 V). It can handle unipolar input signal ranges of 0 mV to +20 mV, 0 mV to +80 mV, 0 V to +1.25 V and 0 V to +2.5 V. It can also handle bipolar input signal ranges of ±20 mV, ±80 mV, ±1.25 V and ±2.5 V. These bipolar ranges are referenced to the negative input of the differential analog input. The AD7715 thus performs all signal conditioning and conversion for a single-channel system.

The AD7715 is ideal for use in smart microcontroller or DSP based systems. It features a serial interface that can be configured for three-wire operation. Gain settings, signal polarity and update rate selection can be configured in software using the input serial port. The part contains self-calibration and system calibration options to eliminate gain and offset errors on the part itself or in the system.

CMOS construction ensures very low power dissipation, and the power-down mode reduces the standby power consumption to 15 µW typical at 3 V operation. The part is available in a 16-pin, 0.3 inch-wide, plastic dual-in-line package (DIP), a 16-lead 0.3 inch-wide small outline (SOIC) package and in a tiny 16-lead Thin Shrink Small Outline Package (TSSOP).

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  • Charge-Balancing ADC
    - 16 Bits No Missing Codes
    - 0.0015% Nonlinearity
  • Programmable Gain Front End
    - Gains of 1, 2, 32 and 128
    - Differential Input Capability
  • SPI®, QSPI™, MICROWIRE™ and DSP Compatible
  • Three-Wire Serial Interface
  • Ability to Buffer the Analog Input
  • 3 V (AD7715-3) or 5 V (AD7715-5) Operation
  • Low Supply Current: 450 µA max @ 3 V Supplies
  • Low-Pass Filter with Programmable Output Update
  • 16-Lead SOIC/DIP/TSSOP
  • Resolution (Bits): 16bit
  • T-Put Rate: 500SPS
  • # Chan: 1
  • Supply V: Single(+3),Single(+3.3),Single(+5)
  • Pwr Diss: 9.5mW
  • Interface: Ser,SPI
  • Ain Range: (Vref/PGA Gain) p-p,Uni (Vref)/(PGA Gain)
  • SNR (dB): 98dB
  • Pkg Type: DIP,SOIC,SOP

Functional Block Diagram for AD7715

AD7715 Diagram
Functional Block Diagram for AD7715

OF NOTE ...

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*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.