Overview
The AD7730LBRUZ, produced by Analog Devices Inc., is a complete analog front end designed specifically for weigh-scale and pressure measurement applications. This device accepts low-level signals directly from a transducer and outputs 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 adjustments in filter cutoff, output rate, and settling time. The AD7730LBRUZ operates from a single +5 V supply and is available in a 24-lead TSSOP package, making it a lower power version of the AD7730, consuming approximately one-third the power.
Key Specifications
| Parameter | Value | Conditions/Comments |
|---|---|---|
| Resolution | 24-bit | Sigma-Delta ADC |
| Analog Input Ranges | 0 mV to +10 mV, +20 mV, +40 mV, +80 mV (unipolar); ±10 mV, ±20 mV, ±40 mV, ±80 mV (bipolar) | |
| Supply Voltage | 2.7 V to 5.25 V | |
| Operating Temperature | -40°C to 85°C | |
| Power Consumption | Approximately 1/3 of AD7730 | |
| Package Type | 24-lead TSSOP | |
| Offset Drift | Less than 5 nV/°C | |
| Gain Drift | Less than 3 ppm/°C | |
| Serial Interface | Three-wire SPI compatible |
Key Features
- Proprietary programmable gain front end based around an analog modulator.
- Low pass programmable digital filter for adjusting filter cutoff, output rate, and settling time.
- Two buffered differential programmable gain analog inputs.
- Differential reference input.
- On-chip 6-bit DAC for TARE voltage removal.
- Clock signals for synchronizing AC excitation of the bridge.
- Self-calibration and system calibration options.
- Compatible with microcontrollers and digital signal processors.
Applications
- Weigh-scale applications.
- Pressure measurement applications.
- Bridge transducer applications.
- Load cell applications.
Q & A
- What is the primary application of the AD7730LBRUZ?
The AD7730LBRUZ is primarily used for weigh-scale and pressure measurement applications.
- What is the resolution of the AD7730LBRUZ?
The AD7730LBRUZ has a 24-bit resolution.
- What are the available analog input ranges for the AD7730LBRUZ?
The device supports unipolar ranges of 0 mV to +10 mV, +20 mV, +40 mV, +80 mV, and bipolar ranges of ±10 mV, ±20 mV, ±40 mV, ±80 mV.
- What is the operating supply voltage range for the AD7730LBRUZ?
The device operates from a supply voltage of 2.7 V to 5.25 V.
- What is the operating temperature range for the AD7730LBRUZ?
The operating temperature range is -40°C to 85°C.
- How does the AD7730LBRUZ differ from the AD7730 in terms of power consumption?
The AD7730LBRUZ consumes approximately one-third the power of the AD7730.
- What type of package is the AD7730LBRUZ available in?
The device is available in a 24-lead TSSOP package.
- What is the offset drift and gain drift of the AD7730LBRUZ?
The offset drift is less than 5 nV/°C, and the gain drift is less than 3 ppm/°C.
- Is the AD7730LBRUZ compatible with microcontrollers and digital signal processors?
Yes, the device is compatible with microcontrollers and digital signal processors through its three-wire SPI interface.
- Does the AD7730LBRUZ support self-calibration and system calibration?
Yes, the device supports both self-calibration and system calibration options.
