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 high precision and low power consumption. 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. It features an on-chip programmable gain amplifier (PGA) and a low noise instrumentation amplifier, making it an ideal choice for battery-operated or portable devices where power efficiency is crucial.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices Inc. |
| Part Number | AD7781CRZ |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) |
| Number of Pins | 14 |
| Number of Bits | 20 |
| Sampling Rate | 10 Hz or 16.7 Hz |
| Voltage - Supply, Analog/Digital | 2.7 V ~ 5.25 V |
| Input Type | Differential |
| Reference Type | External |
| Operating Temperature | -40°C ~ 105°C |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Lead Free Status / RoHS Status | Lead free / RoHS Compliant |
| Power Consumption | 330 μA |
Key Features
- Low Power Consumption: The AD7781CRZ consumes only 330 μA, making it suitable for battery-operated or portable devices.
- Pin-Programmable: All features of the AD7781CRZ 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.
- Low Noise Instrumentation Amplifier: Integrated low noise instrumentation amplifier for high precision measurements.
- Sigma-Delta Conversion: Employs sigma-delta (Σ-Δ) conversion technique to achieve up to 20 bits of no missing codes performance.
- Simultaneous 50 Hz/60 Hz Rejection: Available at both 10 Hz and 16.7 Hz output data rates, useful for rejecting low-frequency mechanical vibrations in load cell applications).
- Power-Down Mode: Allows the user to switch off the power to the bridge sensor and power down the AD7781 when not converting, increasing battery life).
- SPI Data Interface: Communicates via an SPI interface, facilitating easy integration into various systems).
Applications
The AD7781CRZ is designed for low-frequency measurement applications, including:
- Bridge Sensor Systems: Ideal for load cell, strain gauge, and other bridge sensor applications due to its high precision and low noise characteristics).
- Portable or Battery-Operated Devices: Suitable for devices where low power consumption is critical to extend battery life).
- Industrial Automation: Can be used in various industrial automation applications requiring precise 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 sampling rates for the AD7781CRZ?
The AD7781CRZ can operate at sampling rates of 10 Hz or 16.7 Hz.
- What is the power consumption of the AD7781CRZ?
The AD7781CRZ consumes 330 μA of power.
- What type of package is the AD7781CRZ available in?
The AD7781CRZ is available in a 14-lead SOIC package.
- Does the AD7781CRZ have an on-chip PGA?
Yes, the AD7781CRZ includes an on-chip programmable gain amplifier (PGA) with gains of 1 or 128.
- What is the operating temperature range of the AD7781CRZ?
The operating temperature range is -40°C to 105°C.
- Is the AD7781CRZ RoHS compliant?
Yes, the AD7781CRZ is lead-free and RoHS compliant.
- What type of data interface does the AD7781CRZ use?
The AD7781CRZ uses an SPI data interface.
- Does the AD7781CRZ have a power-down mode?
Yes, the AD7781CRZ has a power-down mode to increase battery life when not converting.
- What is the input type of the AD7781CRZ?
The AD7781CRZ has a differential input type.
