Datasheet Analog Devices AD7714AN-5 — 数据表

a APPLICATIONS
Portable Industrial Instruments
Portable Weigh Scales
Loop-Powered Systems
Pressure Transducers
GENERAL DESCRIPTION† The AD7714 is a complete analog front end for low-frequency
measurement applications. The device accepts low level signals
directly from a transducer and outputs a serial digital word. It
employs a sigma-delta conversion technique to realize up to 24
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 onchip 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 settling time.
The part features three differential analog inputs (which can also
be configured as five pseudo-differential analog inputs) as well as a
differential reference input. It operates from a single supply (+3␣ V
or +5␣ V). The AD7714 thus performs all signal conditioning and
conversion for a system consisting of up to five channels.
The AD7714 is ideal for use in smart, microcontroller-or DSPbased systems. It features a serial interface that can be configured
†See page 39 for data sheet index.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corporation. REV. C
Information furnished by Analog Devices is believed to be accurate and …