AD7731BR

Series: -
Number of Converters: 1
Mounting Type: Surface Mount
Number of Bits: 24
Voltage Supply Source: Analog and Digital
Operating Temperature: -40°C ~ 85°C
Packaging: Tube
Data Interface: DSP, Serial, SPI?
Package / Case: 24-SOIC (0.295", 7.50mm Width)
Power Dissipation (Max): 125mW
Manufacturer: Analog Devices Inc
Number of Inputs and Type: 3 Differential, Unipolar; 3 Differential, Bipolar; 5 Pseudo-Differential, Unipolar; 5 Pseudo-Differential, Bipolar
Sampling Rate (Per Second): 6.4k
Supplier Device Package: 24-SOIC W


Description

The AD7731BR belongs to AD7731, which is a complete analog front-end for process control applications. The device 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 sigma- delta 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 oper- ates from a single +5 V supply and accepts seven unipolar ana- log 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 perfor- mance level of 13 bits of peak-to-peak resolution. The serial interface on the part can be configured for three-wire operation and is compatible with microcontrollers and digital signal processors. The AD7731 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. The part AD7731BR is available in a 24-lead plastic DIP, a 24-lead SOIC and 24-lead TSSOP package.

The features of AD7731BR can be summarized as (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)±0.0015% nonlinearity; (6)buffered differential inputs; (7)programmable filter cutoffs; (8)faststepTM* mode for channel sequencing; (9)single supply operation. It can be applicated in process control; PLCs/DCS; industrial instrumentation.

The absolute maximum ratings((TA = +25°C unless otherwise noted)) of AD7731BR are (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°C to +85°C; storage temperature range: 65°C to +150°C; (14)junction temperature:+150°C; (15)plastic DIP package, power dissipation: 450 mW; (16)JA thermal impedance:105°C/W; (17)lead temperature (soldering, 10 sec):+260°C; (18)TSSOP package, power dissipation: 450 mW; (19)JA thermal impedance:128°C/W; (20)lead temperature, soldering: vapor phase (60 sec): +215°C; infrared (15 sec):+220°C; (21)SOIC package, power dissipation: 450 mW; (22)JA thermal impedance:75°C/W; (23)lead temperature, soldering: vapor phase (60 sec): +215°C; infrared (15 sec):+220°C(*Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.).

Parameters:

Technical/Catalog Information	AD7731BR
Vendor	Analog Devices Inc
Category	Integrated Circuits (ICs)
Number of Bits	24
Package / Case	24-SOIC (7.5mm Width)
Data Interface	Serial
Packaging	Tube
Sampling Rate (Per Second)	6.4k
Operating Temperature	-40°C ~ 85°C
Voltage Supply Source	Analog and Digital
Number of Inputs and Type	3 Differential, Unipolar; 3 Differential, Bipolar; 5 Pseudo-Differential, Unipolar; 5 Pseudo-Differential, Bipolar
Number of Converters	1
Power Dissipation (Max)	125mW
Drawing Number	*
RoHS Status	RoHS Non-Compliant
Other Names	AD7731BR AD7731BR