Overview
The ADS7822EC/2K5G4, produced by Texas Instruments, is a 12-bit sampling analog-to-digital (A/D) converter known for its high speed and ultra-low power consumption. This converter operates within a supply range of 2.7V to 5.25V and is designed to be highly efficient, consuming as little as 1.6mW at a 200kHz sampling rate. The device features a synchronous serial interface and a pseudo-differential input, making it suitable for a variety of applications, including battery-operated systems, remote data acquisition modules, and isolated data acquisition systems.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Resolution | 12 | 12 | 12 | Bits | |
| No Missing Codes | 11 | 12 | 12 | Bits | |
| Full-Scale Input Span | +In - (-In) | 0 | VREF | VREF | V |
| Absolute Input Range (+In) | -0.2 VCC | VCC + 0.2 | V | ||
| Absolute Input Range (-In) | -0.2 | +1.0 | V | ||
| Capacitance | 25 | 25 | 25 | pF | |
| Leakage Current | ±1 | ±1 | ±1 | μA | |
| Integral Linearity Error | -2 | +2 | LSB | ||
| Differential Linearity Error | ±0.8 | ±0.8 | LSB | ||
| Power Consumption at 200kHz | 320 | 550 | 550 | μA | |
| Power Down Current | CS = VCC | 3 | 3 | 3 | μA |
| Temperature Range | -40 | +85 | °C |
Key Features
- High-Speed Conversion: The ADS7822 can perform up to 200,000 conversions per second.
- Ultra-Low Power Consumption: Consumes as little as 1.6mW at 200kHz and less than 60μW at 7.5kHz.
- Pseudo-Differential Input: Allows for differential input signals with the –In input not resampled later in the conversion cycle.
- Synchronous Serial Interface: Data is clocked out serially, most significant bit first, on the DOUT pin.
- External Reference Voltage: Can be set to any level between 50mV and VCC, directly setting the range of the analog input.
- Power Down Mode: Enables the device to spend most of its time in power-down mode, reducing power dissipation.
- Compact Packaging: Available in mini-DIP-8, SO-8, and MSOP-8 packages.
Applications
- Battery-Operated Systems: Ideal due to its ultra-low power consumption and small size.
- Remote Data Acquisition Modules: Suitable for remote data acquisition due to its low power and compact design.
- Simultaneous Multichannel Systems: Can be used in systems requiring simultaneous sampling of multiple channels.
- Isolated Data Acquisition: Perfect for isolated data acquisition applications where low power and high accuracy are required.
Q & A
- What is the resolution of the ADS7822?
The ADS7822 has a resolution of 12 bits.
- What is the 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 3μA maximum when CS = VCC.
- What is the temperature range for the ADS7822?
The specified temperature range is –40°C to +85°C.
- What types of packages are available for the ADS7822?
The ADS7822 is available in mini-DIP-8, SO-8, and MSOP-8 packages.
- Can the ADS7822 be used in battery-operated systems?
Yes, it is ideal for battery-operated systems due to its ultra-low power consumption.
- What is the range for the external reference voltage?
The external reference voltage can be set to any level between 50mV and VCC.
- How does the ADS7822 handle differential input signals?
The ADS7822 features a pseudo-differential input, allowing for differential input signals without resampling the –In input later in the conversion cycle.
- What is the significance of the synchronous serial interface in the ADS7822?
The synchronous serial interface allows data to be clocked out serially, most significant bit first, on the DOUT pin, synchronized by the DCLOCK input.
