Overview
The AD7781CRUZ-REEL is a 20-bit, pin-programmable, ultralow power sigma-delta analog-to-digital converter (ADC) produced by Analog Devices Inc. This device is designed for low-frequency measurement applications, particularly in systems that require high precision and low power consumption. It is suitable for use in portable or battery-operated products due to its low power requirements, consuming only 330 μA. The AD7781CRUZ-REEL features a power-down mode to further extend battery life by switching off power to the bridge sensor and the ADC when not in use.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices Inc. |
| Package | 16-TSSOP (0.173", 4.40mm Width) |
| Number of Bits | 20 |
| Sampling Rate (Per Second) | 10 Hz or 16.7 Hz |
| Number of Inputs | 1 Differential Input |
| Data Interface | SPI |
| Architecture | Sigma-Delta |
| Reference Type | External Voltage |
| Voltage - Supply, Analog | 2.7 V ~ 5.25 V |
| Voltage - Supply, Digital | 2.7 V ~ 5.25 V |
| Operating Temperature | -40°C ~ 105°C |
| Power Consumption | 330 μA |
Key Features
- Low Power Consumption: The AD7781CRUZ-REEL consumes only 330 μA, making it ideal for battery-operated devices.
- Pin-Programmable: All features of the AD7781 are controlled by dedicated pins, enhancing ease of use.
- On-Chip PGA: The device includes a programmable gain amplifier (PGA) with gains of 1 or 128, supporting full-scale differential inputs of ±5 V or ±39 mV.
- Filter Response Options: The AD7781 offers two filter response options, providing superior dynamic performance at the 16.7 Hz update rate and better than -45 dB of stop-band attenuation at the 10 Hz update rate.
- Simultaneous 50 Hz/60 Hz Rejection: Available at both output data rates, this feature is particularly useful in load cell applications to reject low-frequency mechanical vibrations.
- Power-Down Mode: Allows the user to switch off power to the bridge sensor and the AD7781 when not converting, increasing battery life).
Applications
The AD7781CRUZ-REEL is primarily used in low-frequency measurement applications such as:
- Bridge Sensor Systems: It serves as a complete analog front end for these systems, including a low noise instrumentation amplifier).
- Load Cell Applications: The device's ability to reject low-frequency mechanical vibrations makes it suitable for load cell measurements).
- Portable and Battery-Operated Devices: Its low power consumption makes it ideal for use in devices where battery life is a critical factor).
Q & A
- What is the number of bits in the AD7781CRUZ-REEL ADC?
The AD7781CRUZ-REEL is a 20-bit analog-to-digital converter.
- What are the available sampling rates for the AD7781CRUZ-REEL?
The device can be programmed to operate at sampling rates of 10 Hz or 16.7 Hz.
- What is the power consumption of the AD7781CRUZ-REEL?
The AD7781CRUZ-REEL consumes 330 μA of power.
- What type of package is the AD7781CRUZ-REEL available in?
The device is available in a 16-lead TSSOP package.
- What is the operating temperature range of the AD7781CRUZ-REEL?
The operating temperature range is -40°C to 105°C.
- Does the AD7781CRUZ-REEL have a power-down mode?
Yes, the device has a power-down mode to extend battery life by switching off power when not converting.
- What is the gain range of the on-chip PGA in the AD7781CRUZ-REEL?
The on-chip PGA has gains of 1 or 128.
- What type of data interface does the AD7781CRUZ-REEL use?
The device uses an SPI data interface.
- Is the AD7781CRUZ-REEL suitable for load cell applications?
Yes, it is suitable due to its ability to reject low-frequency mechanical vibrations.
- What is the voltage supply range for the AD7781CRUZ-REEL?
The voltage supply range is 2.7 V to 5.25 V for both analog and digital supplies.
