AD7731BRUZ

Product Summary

The AD7731BRUZ is an A/D Converter. The AD7731BRUZ is a complete analog front-end for process control applications. The AD7731BRUZ has a proprietary programmable gain front end that allows it to accept a range of input signal ranges, including low level signals, directly from a transducer. The sigmadelta architecture of the part consists of an analog modulator and a low pass programmable digital filter, allowing adjustment of filter cutoff, output rate and settling time. The part features three buffered differential programmable gain analog inputs (which can be configured as five pseudo-differential inputs), as well as a differential reference input. The part operates from a single +5 V supply and accepts seven unipolar analog input ranges: 0 to +20 mV, +40 mV, +80 mV, +160 mV, +320 mV, +640 mV and +1.28 V, and seven bipolar ranges: ±20 mV, ±40 mV, ±80 mV, ±160 mV, ±320 mV, ±640 mV and ±1.28 V. The peak-to-peak resolution achievable directly from the part is 16 bits at an 800 Hz output rate. The part can switch between channels with 1 ms settling time and maintain a performance level of 13 bits of peak-to-peak resolution. The applications of the AD7731BRUZ include Process Control, PLCs/DCS and Industrial Instrumentation.

Parametrics

AD7731BRUZ absolute maximum ratings: (1)AVDD to AGND : –0.3 V to +7 V; (2)AVDD to DGND : –0.3 V to +7 V; (3)DVDD to AGND : –0.3 V to +7 V; (4)DVDD to DGND : –0.3 V to +7 V; (5)AGND to DGND : –5 V to +0.3 V; (6)AVDD to DVDD : –2 V to +5 V; (7)Analog Input Voltage to AGND : –0.3 V to AVDD + 0.3 V; (8)Reference Input Voltage to AGND : –0.3 V to AVDD + 0.3 V; (9)AIN/REF IN Current (Indefinite) : 30 mA; (10)Digital Input Voltage to DGND : –0.3 V to DVDD + 0.3 V; (11)Digital Output Voltage to DGND : –0.3 V to DVDD + 0.3 V; (12)Output Voltage (D0, D1) to DGND : –0.3 V to AVDD + 0.3 V; (13)Operating Temperature Range Industrial (B Version) : –40℃ to +85℃; (15)Storage Temperature Range : –65℃ to +150℃; (16)Junction Temperature : +150℃; (17)Plastic DIP Package, Power Dissipation : 450 mW; (18)θJA Thermal Impedance : 105℃/W; (19)Lead Temperature (Soldering, 10 sec) : +260℃; (20)TSSOP Package, Power Dissipation : 450 mW; (21)θJA Thermal Impedance : 128℃/W; (22)Lead Temperature, Soldering Vapor Phase (60 sec) : +215℃; (23)Infrared (15 sec) : +220℃; (24)SOIC Package, Power Dissipation : 450 mW; (26)θJA Thermal Impedance : 75℃/W; (27)Lead Temperature, Soldering Vapor Phase (60 sec) : +215℃; (28)Infrared (15 sec) : +220℃.

Features

AD7731BRUZ features: (1)24-Bit Sigma-Delta ADC; (2)16 Bits p-p Resolution at 800 Hz Output Rate; (3)Programmable Output Rates up to 6.4 kHz; (4)Programmable Gain Front End; (5)60.0015% Nonlinearity; (6)Buffered Differential Inputs; (7)Programmable Filter Cutoffs; (8)FASTStepTM* Mode for Channel Sequencing; (9)Single Supply Operation.

Diagrams