Overview
The AD7730BNZ, produced by Analog Devices Inc., is a complete analog front end (AFE) designed 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 adjustment of filter cutoff, output rate, and settling time. The AD7730BNZ operates from a single +5 V supply and is available in various package options, including 24-pin plastic DIP, 24-lead SOIC, and 24-lead TSSOP.
Key Specifications
| Parameter | Value | Conditions/Comments |
|---|---|---|
| Resolution | 24-bit Sigma-Delta | |
| 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 | +5 V | |
| Operating Temperature | -40°C to 85°C | |
| Offset Drift | < 5 nV/°C | |
| Gain Drift | < 2 ppm/°C | |
| Package Options | 24-pin PDIP, 24-lead SOIC, 24-lead TSSOP |
Key Features
- Two buffered differential programmable gain analog inputs.
- Differential reference input.
- On-chip 6-bit DAC for offset/TARE removal.
- Clock signals for synchronizing AC excitation of the bridge.
- Self-calibration and system calibration options.
- FASTStep™ mode for fast step response.
- Serial interface configurable for three-wire operation, compatible with microcontrollers and digital signal processors.
- Standby mode reducing power consumption to 5 μA.
Applications
- Weigh scales.
- Pressure measurement.
Q & A
- What is the primary application of the AD7730BNZ?
The AD7730BNZ is primarily used for weigh-scale and pressure measurement applications.
- What is the resolution of the AD7730BNZ?
The AD7730BNZ has a 24-bit Sigma-Delta resolution.
- What are the input ranges supported by the AD7730BNZ?
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 respectively.
- What is the peak-to-peak resolution achievable from the AD7730BNZ?
The peak-to-peak resolution achievable is 1 in 230,000 counts.
- What is the supply voltage requirement for the AD7730BNZ?
The device operates from a single +5 V supply.
- What are the package options available for the AD7730BNZ?
The device is available in 24-pin PDIP, 24-lead SOIC, and 24-lead TSSOP packages.
- Does the AD7730BNZ support self-calibration?
Yes, the AD7730BNZ contains self-calibration and system calibration options.
- What is the offset drift and gain drift of the AD7730BNZ?
The offset drift is less than 5 nV/°C and the gain drift is less than 2 ppm/°C.
- How does the AD7730BNZ interface with other components?
The serial interface can be configured for three-wire operation and is compatible with microcontrollers and digital signal processors.
- What is the power consumption in standby mode?
In standby mode, the power consumption is reduced to 5 μA.
