Overview
The ADS7822EB/2K5 from Texas Instruments is a 12-bit, microPower sampling analog-to-digital (A/D) converter designed for low-power and high-speed applications. This device operates over a supply range of 2.7V to 5.25V and is capable of sampling at rates up to 200kHz while consuming very little power, making it ideal for battery-operated systems and remote data acquisition modules.
The ADS7822 features a pseudo-differential input, a synchronous serial interface, and the ability to operate in power-down mode, reducing power dissipation to less than 60μW at lower conversion rates. It is available in mini-DIP-8, SO-8, and MSOP-8 packages.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 12 | 12 | 12 | Bits |
| Sampling Rate | - | 200 | - | kHz |
| Power Consumption at 200kHz | - | 1.6 | - | mW |
| Power Consumption at 75kHz | - | 0.54 | - | mW |
| Power Consumption at 7.5kHz | - | 0.06 | - | mW |
| Power Down Current | - | - | 3 | μA |
| Integral Linearity Error | -2 | - | +2 | LSB |
| Differential Linearity Error | -1 | - | +1 | LSB |
| Offset Error | -3 | - | +3 | LSB |
| Gain Error | -3 | - | +3 | LSB |
| Noise | - | 33 | - | μVrms |
| Power-Supply Rejection | - | 82 | - | dB |
| Operating Temperature Range | -40 | - | +85 | °C |
Key Features
- High-Speed Conversion: Up to 200kHz sampling rate.
- Low Power Consumption: MicroPower operation with as low as 0.06mW at 7.5kHz.
- Pseudo-Differential Input: Allows for differential input signals.
- Synchronous Serial Interface: Data is clocked out serially, most significant bit first.
- Power Down Mode: Reduces power dissipation to less than 60μW at lower conversion rates.
- Flexible Reference Voltage: Can be set to any level within the range of 50mV to VCC.
- Compact Packages: Available in mini-DIP-8, SO-8, and MSOP-8 packages.
Applications
- Battery-Operated Systems: Ideal for systems where low power consumption is critical.
- Remote Data Acquisition: Suitable for remote data-acquisition modules due to its low power and high speed.
- Simultaneous Sampling, Multichannel Systems: Can be used in systems requiring simultaneous sampling of multiple channels.
- Isolated Data Acquisition: Appropriate for isolated data acquisition applications.
Q & A
- What is the maximum sampling rate of the ADS7822?
The ADS7822 can sample at rates up to 200kHz.
- What is the power consumption of the ADS7822 at 200kHz?
The power consumption is approximately 1.6mW at 200kHz.
- What is the power-down current of the ADS7822?
The power-down current is less than 3μA.
- What is the resolution of the ADS7822?
The resolution is 12 bits.
- What is the operating temperature range of the ADS7822?
The operating temperature range is from -40°C to +85°C.
- What types of packages is the ADS7822 available in?
The ADS7822 is available in mini-DIP-8, SO-8, and MSOP-8 packages.
- Can the ADS7822 operate with different reference voltages?
Yes, the reference voltage can be set to any level within the range of 50mV to VCC.
- How does the ADS7822 handle differential input signals?
The ADS7822 features a pseudo-differential input, allowing for differential input signals.
- What is the typical noise level of the ADS7822?
The typical noise level is 33μVrms.
- What is the power-supply rejection ratio of the ADS7822?
The power-supply rejection ratio is 82dB.
