Overview
The AD7781CRZ, produced by Analog Devices Inc., is a 20-bit, pin-programmable, ultralow power sigma-delta analog-to-digital converter (ADC). This device is particularly suited for low-frequency measurement applications, such as bridge sensor systems, due to its low power consumption and high precision. The AD7781CRZ operates with a power supply ranging from 2.7 V to 5.25 V and is available in a 14-lead SOIC package, making it ideal for portable or battery-operated products where power efficiency is crucial.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 20 bits |
| Power Consumption | 330 μA |
| Power Supply Range | 2.7 V to 5.25 V |
| Package Type | 14-Lead SOIC |
| Temperature Range | -40°C to 105°C |
| Update Rates | 10 Hz, 16.7 Hz |
| PGA Gain | 1 or 128 |
| Full-Scale Differential Input | ±5 V or ±39 mV |
| Settling Time | 120 ms (16.7 Hz), 300 ms (10 Hz) |
| 50 Hz/60 Hz Rejection | Simultaneous rejection at both update rates |
Key Features
- Low power consumption of 330 μA, making it suitable for battery-operated devices.
- Pin-programmable features for ease of use.
- On-chip PGA with a gain of 1 or 128, supporting full-scale differential inputs of ±5 V or ±39 mV.
- Two filter response options: 10 Hz and 16.7 Hz update rates, with the latter providing superior dynamic performance and the former offering better stop-band attenuation.
- Simultaneous 50 Hz/60 Hz rejection at both update rates.
- On-board clock, eliminating the need for an external clock.
- Low noise instrumentation amplifier and analog modulator for high precision measurements.
- Power-down mode to increase battery life by switching off power to the bridge sensor and the ADC when not converting.
Applications
The AD7781CRZ is designed for low-frequency measurement applications, particularly in:
- Bridge sensor systems, such as load cells and pressure sensors.
- Portable or battery-operated products where low power consumption is critical.
- Industrial automation and control systems requiring high precision and low noise.
- Medical devices that need accurate and reliable analog-to-digital conversion.
Q & A
- What is the resolution of the AD7781CRZ?
The AD7781CRZ has a resolution of 20 bits.
- What are the available update rates for the AD7781CRZ?
The AD7781CRZ supports update rates of 10 Hz and 16.7 Hz.
- What is the power consumption of the AD7781CRZ?
The AD7781CRZ consumes 330 μA of power.
- What are the gain options for the on-chip PGA of the AD7781CRZ?
The on-chip PGA of the AD7781CRZ has gain options of 1 or 128.
- Does the AD7781CRZ have simultaneous 50 Hz/60 Hz rejection?
- What is the temperature range for the AD7781CRZ?
The AD7781CRZ operates within a temperature range of -40°C to 105°C.
- What type of package is the AD7781CRZ available in?
The AD7781CRZ is available in a 14-lead SOIC package.
- Does the AD7781CRZ have a power-down mode?
- What is the purpose of the on-board clock in the AD7781CRZ?
The on-board clock eliminates the need for an external clock.
- Is there an evaluation board available for the AD7781CRZ?
