Overview
The ADS7822EC/2K5, produced by Texas Instruments, is a 12-bit sampling analog-to-digital (A/D) converter designed for high-speed and low-power applications. This microPower converter operates within a supply range of 2.7V to 5.25V and is capable of sampling at rates up to 200kHz. It features a pseudo-differential input and a synchronous serial interface, making it ideal for battery-operated systems, remote data acquisition, and simultaneous multichannel systems.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Resolution | 12 | 12 | 12 | Bits | |
| Sampling Rate | 200kHz | ||||
| Power Consumption | fSAMPLE = 200kHz | 320 | 550 | 550 | μA |
| Power Consumption | fSAMPLE = 75kHz | 200 | 325 | 325 | μA |
| Power Down Current | CS = VCC | 3 | 3 | 3 | μA |
| Temperature Range | –40 | +85 | °C | ||
| Full-Scale Input Span | +In – (–In) | 0 | VREF | V | |
| Integral Linearity Error | –2 | +2 | LSB | ||
| Differential Linearity Error | ±0.8 | ±0.8 | LSB |
Key Features
- High-Speed Sampling: Up to 200kHz sampling rate.
- Low Power Consumption: MicroPower design with power consumption as low as 1.6mW at 200kHz and 0.06mW at 7.5kHz.
- Pseudo-Differential Input: Allows for differential input signals.
- Synchronous Serial Interface: Data clocked out serially, most significant bit first, on the DOUT pin.
- Flexible Reference Voltage: Reference voltage can be set to any level within the range of 50mV to VCC.
- Multiple Package Options: Available in mini-DIP-8, SO-8, and MSOP-8 packages.
- Power Down Mode: Low power dissipation in shutdown mode, less than 60μW at 7.5kHz.
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 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 sampling rate?
The power consumption is approximately 1.6mW at 200kHz.
- What is the reference voltage range for the ADS7822?
The reference voltage can be set to any level within the range of 50mV to VCC.
- What types of packages is the ADS7822 available in?
The ADS7822 is available in mini-DIP-8, SO-8, and MSOP-8 packages.
- How does the ADS7822 handle power-down mode?
In power-down mode, the ADS7822 has a low power dissipation of less than 60μW at 7.5kHz.
- What is the resolution of the ADS7822?
The ADS7822 has a resolution of 12 bits.
- What is the temperature range for the ADS7822?
The specified temperature range is –40°C to +85°C.
- Does the ADS7822 support differential input signals?
Yes, the ADS7822 supports pseudo-differential input signals.
- How is the data output from the ADS7822?
The data is clocked out serially, most significant bit first, on the DOUT pin.
- What are some typical applications of the ADS7822?
Typical applications include battery-operated systems, remote data acquisition, simultaneous multichannel systems, and isolated data acquisition.
