Overview
The AD7708BR, manufactured by Analog Devices Inc., is a 16-bit, low voltage, low power analog-to-digital converter (ADC) designed for low frequency measurement applications. It serves as a complete analog front-end, offering high resolution and precision. The device is available in 28-lead SOIC and TSSOP packages, making it versatile for various system designs. The AD7708BR is pin-for-pin compatible with its 24-bit counterpart, the AD7718, allowing for easy upgrades without hardware modifications.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| Number of Bits | 16 | - | - |
| Sampling Rate | 1.37 kSPS | - | - |
| Number of Inputs | 4/5 Differential, 8/10 Pseudo-Differential | - | - |
| Input Type | Differential, Pseudo-Differential, Single Ended | - | - |
| Data Interface | SPI, DSP | - | - |
| Configuration | MUX-PGA-ADC | - | - |
| Architecture | Sigma-Delta | - | - |
| Reference Type | External | - | - |
| Voltage - Supply, Analog | 2.7 V to 3.3 V, 5 V | V | - |
| Voltage - Supply, Digital | 2.7 V to 3.3 V, 5 V | V | - |
| Operating Temperature | -40°C to 85°C | °C | - |
| Package / Case | 28-SOIC (0.295", 7.50mm Width) | - | - |
Key Features
- High resolution 16-bit Σ-Δ ADC with programmable gain front end.
- Simultaneous 50 Hz and 60 Hz rejection.
- Factory-calibrated single conversion cycle setting.
- Configurable as 4/5 fully-differential input channels or 8/10 pseudo-differential input channels.
- Input signal ranges from 20 mV to 2.56 V can be directly converted without the need for signal conditioning.
- Operates from a single 3 V or 5 V supply with low power dissipation (3.84 mW typ at 3 V).
- Software programmable output data rate.
- On-board PLL generating the required internal operating frequency from a 32 kHz crystal.
Applications
The AD7708BR is suitable for a variety of low frequency measurement applications, including industrial process control, medical devices, and data acquisition systems. Its high resolution and low noise make it ideal for precision measurement tasks such as monitoring temperature, pressure, and other physical parameters.
Q & A
- What is the resolution of the AD7708BR?
The AD7708BR has a 16-bit resolution. - How many input channels does the AD7708BR support?
The AD7708BR can be configured as 4/5 fully-differential input channels or 8/10 pseudo-differential input channels. - What is the input signal range for the AD7708BR?
The input signal range is from 20 mV to 2.56 V. - What is the power supply requirement for the AD7708BR?
The device operates from a single 3 V or 5 V supply. - What is the typical power dissipation of the AD7708BR at 3 V supply?
The typical power dissipation is 3.84 mW. - Does the AD7708BR support simultaneous 50 Hz and 60 Hz rejection?
Yes, it does support simultaneous 50 Hz and 60 Hz rejection. - What is the data interface of the AD7708BR?
The data interface is SPI and DSP. - What is the operating temperature range of the AD7708BR?
The operating temperature range is -40°C to 85°C. - What package types are available for the AD7708BR?
The device is available in 28-lead SOIC and TSSOP packages. - Is the AD7708BR pin-for-pin compatible with other models?
Yes, it is pin-for-pin compatible with the AD7718, allowing for easy upgrades without hardware modifications.
