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MFG:ADI D/C:09
Part Number: AD7730
MFG: ADI
D/C: 09
Description: The AD7730 is a complete analog front end for weigh-scale and pressure measurement applications. The d...
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AD7730
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DataSheet
General Description
AD7730 General Description
The AD7730 is a complete analog front end for weigh-scale and pressure measurement applications. The device accepts low-level signals directly from a transducer and outputs a serial digital word. The input signal is applied to a proprietary pro-grammable gain front end based around an analog modulator.The modulator output is processed by a low pass programmable digital filter, allowing adjustment of filter cutoff, output rate and
settling time.
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 synchro-nizing ac excitation of the bridge are also provided.
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. The AD7730 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.
AD7730 Maximum Ratings
AVDD to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V
AVDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.3 V to +7 V
DVDD to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 0.3 V to +7 V
DVDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V
AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 V to +0.3 V
AVDD to DVDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 V to +5 V
Analog Input Voltage to AGND . . . . . . . . . . . . . . . . . . . . . . . . .. 0.3 V to AVDD + 0.3 V
Reference Input Voltage to AGND . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to AVDD + 0.3 V
AIN/REF IN Current (Indefinite) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 30 mA
Digital Input Voltage to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to DVDD + 0.3 V
Digital Output Voltage to DGND . . . . . . . . . . . . . . . . . . . . . . . . .0.3 V to DVDD + 0.3 V
Output Voltage (ACX, ACX, D0, D1) to DGND. . . . . . . . . . . . . . . .0.3 V to AVDD + 0.3 V
Operating Temperature Range
Industrial (B Version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . +150°C
Plastic DIP Package, Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 450 mW
JAThermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 °C/W
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . +260°C
TSSOP Package, Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450 mW
JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
SOIC Package, Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450 mW
JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
AVDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0.3 V to +7 V
DVDD to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 0.3 V to +7 V
DVDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V
AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 V to +0.3 V
AVDD to DVDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 V to +5 V
Analog Input Voltage to AGND . . . . . . . . . . . . . . . . . . . . . . . . .. 0.3 V to AVDD + 0.3 V
Reference Input Voltage to AGND . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to AVDD + 0.3 V
AIN/REF IN Current (Indefinite) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 30 mA
Digital Input Voltage to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to DVDD + 0.3 V
Digital Output Voltage to DGND . . . . . . . . . . . . . . . . . . . . . . . . .0.3 V to DVDD + 0.3 V
Output Voltage (ACX, ACX, D0, D1) to DGND. . . . . . . . . . . . . . . .0.3 V to AVDD + 0.3 V
Operating Temperature Range
Industrial (B Version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . +150°C
Plastic DIP Package, Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 450 mW
JAThermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 °C/W
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . +260°C
TSSOP Package, Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450 mW
JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
SOIC Package, Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450 mW
JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
AD7730 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(TM) Mode
AC or DC Excitation
Single Supply Operation
APPLICATIONS
Weigh Scales
Pressure Measurement
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(TM) Mode
AC or DC Excitation
Single Supply Operation
APPLICATIONS
Weigh Scales
Pressure Measurement
AD7730 Connection Diagram
AD7730
PDF/DataSheet Download
- Datasheet: AD7730
- File Size: 509279 KB
- Manufacturer: AD [Analog Devices]
- Click here to Download
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