Shenzhen Meiyuxin Technology Co., Ltd. [ADI agent] sells AD7730BRUZ-REEL7 analog-to-digital converter - ADC TRANSDUCER ADC I.C.

GENERAL DESCRIPTION

AD7730BRUZ-REEL7 is a complete analog front end for weigh-scale and pressure measurement applications. The device accepts lowlevel signals directly from a transducer and outputs a serial digital word. The input signal is applied to a proprietary programmable gain front end based around an analog modulator.

AD7730BRUZ-REEL7 The modulator output is processed by a low pass programmable digital filter, allowing adjustment of filter cutoff, output rate and settling time.

AD7730BRUZ-REEL7 The part features two buffered differential programmable gain analog inputs as well as a differential reference input. The part operates from a single +5 V supply. It accepts four unipolar analog input ranges: 0 mV to +10 mV, +20 mV, +40 mV and +80 mV and four bipolar ranges: ±10 mV, ±20 mV, ±40 mV and ±80 mV. The peak-to-peak resolution achievable directly from the part is 1 in 230,000 counts. An on-chip 6-bit DAC allows the removal of TARE voltages. Clock signals for synchronizing ac excitation of the bridge are also provided.

AD7730BRUZ-REEL7 The serial interface on the part can be configured for three-wire operation and is compatible with microcontrollers and digital signal processors. The AD7730 contains self-calibration and system calibration options, and features an offset drift of less than 5 nV/°C and a gain drift of less than 2 ppm/°C.

AD7730BRUZ-REEL7 is available in a 24-pin plastic DIP, a 24-lead SOIC and 24-lead TSSOP package. The AD7730L is available in a 24-lead SOIC and 24-lead TSSOP package.

KEY FEATURES

Resolution of 230,000 Counts (Peak-to-Peak)

Offset Drift: 5 nV/C

Gain Drift: 2 ppm/C

Line Frequency Rejection: >150 dB

Buffered Differential Inputs

Programmable Filter Cutoffs

Specified for Drift Over Time

Operates with Reference Voltages of 1 V to 5 V

ADDITIONAL FEATURES

Two-Channel Programmable Gain Front End

On-Chip DAC for Offset/TARE Removal

FASTStep™ Mode

AC or DC Excitation

Single Supply Operation

APPLICATIONS

Weigh Scales

Pressure Measurement