AD7718BRUZ-REEL7

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1. DESCRIPTION

The AD7718BRUZ-REEL7 are complete analog front-ends for low frequency measurement applications. The AD7718BRUZ-REEL7 contains a 24-bit Σ-∆ ADC with PGA and can be configured as 4/5 fullydifferential input channels or 8/10 pseudo-differential input channels. Two pins on the device are configurable as analog inputs or reference inputs. The AD7708 is a 16-bit version of the AD7718BRUZ-REEL7. Input signal ranges from 20 mV to 2.56 V can be directly converted using these ADCs. Signals can be converted directly from a transducer without the need for signal conditioning. The device operates from a 32 kHz crystal with an on-board PLL generating the required internal operating frequency. The output data rate from the part is software programmable. The peak-topeak resolution from the part varies with the programmed gain and output data rate. The part operates from a single 3 V or 5 V supply. When operating from 3 V supplies, the power dissipation for the part is 3.84 mW typ. Both parts are pin-for-pin compatible allowing an upgradable path from 16 to 24 bits without the need for hardware modifications. The AD7718BRUZ-REEL7 are housed in 28-lead SOIC and TSSOP packages.

2. FEATURES

    1. 8-/10-Channel, High Resolution
- ADCs

    2. AD7708 Has 16-Bit Resolution

    3. AD7718 Has 24-Bit Resolution

    4. Factory-Calibrated

    5. Single Conversion Cycle Setting

    6. Programmable Gain Front End

    7. Simultaneous 50 Hz and 60 Hz Rejection

    8. VREF Select™ Allows Absolute and Ratiometric

        - Measurement Capability

    9. Operation Can Be Optimized for

        - Analog Performance (CHOP = 0) or 

        - Channel Throughput (CHOP = 1)

3. INTERFACE

    1. 3-Wire Serial

    2. SPITM, QSPITM, MICROWIRETM, and DSP-Compatible Schmitt Trigger on SCLK

4. POWER

    1. Specified for Single 3 V and 5 V Operation

    2. Normal: 1.28 mA Typ @ 3 V

    3. Power-Down: 30 A (32 kHz Crystal Running)

    4. On-Chip Functions

    5. Rail-to-Rail Input Buffer and PGA

    6. 2-Bit Digital I/O Port

5. APPLICATIONS

    1. Industrial Process Control

    2. Instrumentation

    3. Pressure Transducers

    4. Portable Instrumentation

    5. Smart Transmitters