Overview
The AD7730BR is a complete analog front end designed for weigh-scale and pressure measurement applications. Produced by Analog Devices Inc., this device is capable of accepting low-level signals directly from a transducer and outputting a serial digital word. It features a proprietary programmable gain front end based around an analog modulator and a low pass programmable digital filter, allowing for adjustment of filter cutoff, output rate, and settling time.
Key Specifications
| Parameter | Value | Conditions/Comments |
|---|---|---|
| Number of Bits | 24 | |
| Number of Channels | 2 | |
| Input Ranges (Unipolar) | 0 mV to +10 mV, +20 mV, +40 mV, +80 mV | |
| Input Ranges (Bipolar) | ±10 mV, ±20 mV, ±40 mV, ±80 mV | |
| Supply Voltage (Analog) | +5 V | |
| Supply Voltage (Digital) | 2.7 V to 5.25 V | |
| Power Consumption | 125 mW | |
| Operating Temperature | -40°C to 85°C | |
| Package Type | 24-SOIC, 24-TSSOP | |
| Clock Frequency | 4.9152 MHz | |
| Resolution | 1 in 230,000 counts |
Key Features
- Programmable gain front end with two buffered differential analog inputs
- Differential reference input
- On-chip 6-bit DAC for offset/TARE removal
- FASTStep mode for fast step response
- AC or DC excitation support
- Single supply operation
- Programmable digital filter for adjusting filter cutoff, output rate, and settling time
- Self-calibration and system calibration options
- Low offset drift (< 5 nV/°C) and low gain drift (< 2 ppm/°C)
- Serial interface compatible with microcontrollers and digital signal processors
Applications
- Weigh scales
- Pressure measurement
- Load cell applications
- General industrial measurement systems requiring high precision and low noise
Q & A
- What is the primary application of the AD7730BR?
The AD7730BR is primarily used in weigh-scale and pressure measurement applications.
- What is the resolution of the AD7730BR?
The AD7730BR achieves a peak-to-peak resolution of 1 in 230,000 counts.
- What are the input ranges supported by the AD7730BR?
The device supports both unipolar and bipolar input ranges: 0 mV to +10 mV, +20 mV, +40 mV, +80 mV and ±10 mV, ±20 mV, ±40 mV, ±80 mV.
- What is the power consumption of the AD7730BR?
The power consumption of the AD7730BR is 125 mW.
- What are the supported supply voltages for the AD7730BR?
The device operates with an analog supply voltage of +5 V and a digital supply voltage of 2.7 V to 5.25 V.
- What types of packages are available for the AD7730BR?
The AD7730BR is available in 24-SOIC and 24-TSSOP packages.
- Does the AD7730BR support self-calibration?
Yes, the AD7730BR supports both self-calibration and system calibration options.
- What is the operating temperature range of the AD7730BR?
The operating temperature range is -40°C to 85°C.
- Is the AD7730BR compatible with microcontrollers and digital signal processors?
Yes, the serial interface of the AD7730BR is compatible with microcontrollers and digital signal processors.
- What is the purpose of the on-chip 6-bit DAC in the AD7730BR?
The on-chip 6-bit DAC is used for offset/TARE removal.
