Overview
The AD7705BRZ-REEL is a 16-bit Sigma-Delta Analog-to-Digital Converter (ADC) produced by Analog Devices Inc. This component is designed as a complete analog front end for low-frequency measurement applications. It features two fully differential analog input channels and is capable of accepting low-level input signals directly from a transducer, producing serial digital output. The AD7705 employs a Σ-Δ conversion technique to achieve up to 16 bits of no missing codes performance, making it ideal for use in smart, microcontroller, or DSP-based systems.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices Inc. |
| Part Number | AD7705BRZ-REEL |
| Package / Case | 16-Lead SOIC Wide |
| Number of Bits | 16 |
| Number of A/D Converters | 1 |
| Number of Inputs | 2 (fully differential) |
| Voltage - Supply, Digital | 2.7 V ~ 3.3 V, 4.75 V ~ 5.25 V |
| Voltage - Supply, Analog | 2.7 V ~ 3.3 V, 4.75 V ~ 5.25 V |
| Sampling Rate (Per Second) | 500 |
| Reference Type | External |
| Operating Temperature | -40°C ~ 85°C |
| Input Type | Differential |
| Data Interface | SPI, DSP |
| Power Dissipation | 1 mW maximum @ 3 V |
| Standby Current | 8 μA maximum |
Key Features
- Programmable Gain Front End: Gains from 1 to 128, allowing for flexible signal conditioning.
- Σ-Δ Conversion Technique: Achieves up to 16 bits of no missing codes performance, ensuring high accuracy and low noise.
- Self-Calibration and System Calibration: Options to eliminate gain and offset errors, enhancing overall system accuracy.
- Low Power Consumption: CMOS construction ensures very low power dissipation, with a standby power consumption of 20 μW typical.
- Serial Interface: Configurable for 3-wire operation, compatible with SPI, QSPI, MICROWIRE, and DSP interfaces.
- Input Signal Range: Can handle unipolar and bipolar input signal ranges, such as 0 mV to 10 mV and ±10 mV through ±1.225 V.
Applications
- Low Frequency Measurement Applications: Ideal for measuring signals from transducers in various industrial and medical applications.
- Smart and Microcontroller-Based Systems: Suitable for use in smart sensors, microcontroller, or DSP-based systems due to its low power consumption and high accuracy.
- Signal Conditioning and Conversion: Performs all necessary signal conditioning and conversion for 2-channel systems, reducing the need for additional external components.
Q & A
- What is the resolution of the AD7705BRZ-REEL ADC?
The AD7705BRZ-REEL has a resolution of 16 bits.
- How many analog input channels does the AD7705BRZ-REEL have?
The AD7705BRZ-REEL features two fully differential analog input channels.
- What is the operating voltage range for the AD7705BRZ-REEL?
The device operates from a single 2.7 V to 3.3 V or 4.75 V to 5.25 V supply.
- What type of conversion technique does the AD7705BRZ-REEL use?
The AD7705BRZ-REEL employs a Σ-Δ (Sigma-Delta) conversion technique.
- What is the maximum power dissipation of the AD7705BRZ-REEL?
The maximum power dissipation is 1 mW at 3 V supply.
- Does the AD7705BRZ-REEL support self-calibration?
Yes, the AD7705BRZ-REEL supports self-calibration and system calibration options.
- What type of data interface does the AD7705BRZ-REEL use?
The device features a serial interface that can be configured for 3-wire operation, compatible with SPI, QSPI, MICROWIRE, and DSP interfaces.
- What is the operating temperature range of the AD7705BRZ-REEL?
The operating temperature range is -40°C to 85°C.
- Is the AD7705BRZ-REEL RoHS compliant?
Yes, the AD7705BRZ-REEL is lead-free and RoHS compliant.
- What is the sampling rate of the AD7705BRZ-REEL?
The sampling rate is 500 samples per second..
