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AD7730

Features: Resolution of 230,000 Counts (Peak-to-Peak)Offset Drift: 5 nV/CGain Drift: 2 ppm/CLine Frequency Rejection: >150 dBBuffered Differential InputsProgrammable Filter CutoffsSpecified for Drift Over TimeOperates with Reference Voltages of 1 V to 5 VADDITIONAL FEATURESTwo-Channel Programma...

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SeekIC No. : 004270764 Detail

AD7730: Features: Resolution of 230,000 Counts (Peak-to-Peak)Offset Drift: 5 nV/CGain Drift: 2 ppm/CLine Frequency Rejection: >150 dBBuffered Differential InputsProgrammable Filter CutoffsSpecified for D...

AD7730 Data Sheet

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Part Number:
AD7730
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



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




Pinout

AD7730 Diagram

Connection Diagram




Specifications

Resolution (Bits) 24bit
T-Put Rate 1.2kSPS
# Chan 2
Supply V Multi(+3, +5),Single(+5)
Pwr Diss 65mW
Interface Ser
Ain Range Uni (Vref)/(PGA Gain)
SNR (dB) 123dB
Pkg Type DIP,SOIC,SOP


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




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

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 AD7730 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.






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