Overview
The AD7730BRU-REEL7, produced by Analog Devices Inc., is a complete analog front end designed for weigh-scale and pressure measurement applications. This device is capable of accepting 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, followed by a low pass programmable digital filter. This configuration allows for the adjustment of filter cutoff, output rate, and settling time.
Key Specifications
| Parameter | Value | Conditions/Comments |
|---|---|---|
| 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 | |
| Peak-to-Peak Resolution | 1 in 230,000 counts | |
| Supply Voltage (AVDD) | +2.7 V to +5.25 V | |
| Supply Voltage (DVDD) | +2.7 V to +5.25 V | |
| AVDD Current (Normal Mode) | 10.3 mA max (except 0 mV to ±10 mV), 22.3 mA max (0 mV to ±10 mV) | |
| DVDD Current (Normal Mode) | 1.3 mA max (DVDD = 2.7 V to 3.3 V), 2.7 mA max (DVDD = 4.75 V to 5.25 V) | |
| Power Dissipation (Normal Mode) | 65 mW max (except 0 mV to ±10 mV), 125 mW max (0 mV to ±10 mV) | AVDD = DVDD = +5 V |
| Offset Drift | < 5 nV/°C | |
| Gain Drift | < 2 ppm/°C |
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 removing TARE voltages.
- Clock signals for synchronizing ac excitation of the bridge.
- Self-calibration and system calibration options.
- Serial interface configurable for three-wire operation, compatible with microcontrollers and digital signal processors.
Applications
- Weigh-scale applications.
- Pressure measurement applications.
- Load cell applications.
- General industrial measurement systems requiring high precision and low noise.
Q & A
- What is the primary function of the AD7730BRU-REEL7?
The AD7730BRU-REEL7 is a complete analog front end designed for weigh-scale and pressure measurement applications, accepting low-level signals directly from a transducer and outputting a serial digital word.
- What are the input ranges supported by the AD7730BRU-REEL7?
The device supports both unipolar (0 mV to +10 mV, +20 mV, +40 mV, +80 mV) and bipolar (±10 mV, ±20 mV, ±40 mV, ±80 mV) input ranges.
- What is the peak-to-peak resolution of the AD7730BRU-REEL7?
The peak-to-peak resolution achievable directly from the part is 1 in 230,000 counts.
- What is the supply voltage range for the AD7730BRU-REEL7?
The supply voltage range is +2.7 V to +5.25 V for both AVDD and DVDD.
- What are the power consumption characteristics of the AD7730BRU-REEL7?
The device consumes up to 10.3 mA (AVDD) and 1.3 mA (DVDD) in normal mode, with power dissipation of up to 65 mW.
- Does the AD7730BRU-REEL7 support self-calibration?
Yes, the device features self-calibration and system calibration options.
- What is the significance of the on-chip 6-bit DAC in the AD7730BRU-REEL7?
The on-chip 6-bit DAC allows for the removal of TARE voltages.
- How does the AD7730BRU-REEL7 interface with other devices?
The serial interface is configurable for three-wire operation and is compatible with microcontrollers and digital signal processors.
- What are the typical applications of the AD7730BRU-REEL7?
The device is typically used in weigh-scale, pressure measurement, and load cell applications, as well as in general industrial measurement systems requiring high precision and low noise.
- What is the drift performance of the AD7730BRU-REEL7?
The device has an offset drift of less than 5 nV/°C and a gain drift of less than 2 ppm/°C.
