Overview
The ADS7822E/2K5, 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 device 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 ADS7822E/2K5 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 | |
| Integral Linearity Error | -2 | +2 | LSB | ||
| Differential Linearity Error | ±0.8 | ±0.8 | LSB | ||
| Full-Scale Input Span | +In - (-In) | 0 | VREF | V | |
| Absolute Input Range (+In) | -0.2 VCC + 0.2 | -0.2 VCC + 0.2 | V | ||
| Absolute Input Range (-In) | -0.2 + 1.0 | -0.2 + 1.0 | V | ||
| Capacitance | 25 | 25 | 25 | pF | |
| Leakage Current | ±1 | ±1 | ±1 | μA | |
| Power Consumption @ 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 ADS7822E/2K5 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 enter a low-power state, reducing power dissipation to 3μA max.
- 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 high-speed conversion capabilities.
- Simultaneous Multichannel Systems: Can be used in systems requiring simultaneous sampling of multiple channels.
- Isolated Data Acquisition: Perfect for isolated data acquisition systems where low power and high accuracy are required.
Q & A
- What is the resolution of the ADS7822E/2K5?
The ADS7822E/2K5 has a resolution of 12 bits.
- What is the maximum sampling rate of the ADS7822E/2K5?
The maximum sampling rate is 200kHz.
- What is the power consumption at 200kHz sampling rate?
The power consumption is approximately 1.6mW at 200kHz.
- What is the range of the external reference voltage?
The external reference voltage can be set to any level between 50mV and VCC.
- What types of packages are available for the ADS7822E/2K5?
The device is available in mini-DIP-8, SO-8, and MSOP-8 packages.
- How does the device handle power-down mode?
In power-down mode, the device reduces power dissipation to 3μA max.
- What is the temperature range for the ADS7822E/2K5?
The specified temperature range is from -40°C to +85°C.
- Can the ADS7822E/2K5 be used in battery-operated systems?
Yes, it is ideal for battery-operated systems due to its ultra-low power consumption.
- How does the pseudo-differential input work?
The pseudo-differential input allows for differential input signals without resampling the –In input later in the conversion cycle.
- What is the significance of the external clock in the ADS7822E/2K5?
The external clock determines the conversion speed and can vary between 10kHz and 1.2MHz.
