Overview
The ADS7822E/250G4 is a 12-bit sampling analog-to-digital (A/D) converter produced by Texas Instruments. This microPower device is designed for low power consumption and high performance, making it ideal for battery-operated systems and remote data acquisition modules. The ADS7822E operates over a supply range of 2.7V to 5.25V and features a pseudo-differential input, a synchronous serial interface, and a power-down mode to minimize power dissipation.
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 |
| Conversion Time | - | 12 | - | Clk Cycles |
| Acquisition Time | - | 1.5 | - | Clk Cycles |
| Throughput Rate | - | 200 | - | kHz |
| Operating Temperature Range | -40 | - | +85 | °C |
| Package Types | Mini-DIP-8, SO-8, MSOP-8 | - | - | - |
Key Features
- Low Power Consumption: The ADS7822E consumes very little power, with 1.6mW at 200kHz, 0.54mW at 75kHz, and 0.06mW at 7.5kHz, making it suitable for battery-operated systems.
- 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, synchronized by the DCLOCK input.
- Power Down Mode: Reduces power dissipation to less than 60μW at 7.5kHz and a maximum of 3μA when in shutdown mode.
- Flexible Reference Voltage: The reference voltage can be set to any level within the range of 50mV to VCC.
- High Accuracy: Features low integral and differential linearity errors, ensuring high accuracy in conversions.
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 small size.
- Simultaneous Sampling, Multichannel Systems: Can be used in systems requiring simultaneous sampling of multiple channels.
- Isolated Data Acquisition: Appropriate for isolated data acquisition applications where signal integrity is important.
Q & A
- What is the resolution of the ADS7822E?
The ADS7822E has a resolution of 12 bits.
- What is the maximum sampling rate of the ADS7822E?
The maximum sampling rate is 200kHz.
- How much power does the ADS7822E consume at 200kHz?
The power consumption at 200kHz is approximately 1.6mW.
- What are the package types available for the ADS7822E?
The ADS7822E is available in Mini-DIP-8, SO-8, and MSOP-8 packages.
- What is the operating temperature range of the ADS7822E?
The operating temperature range is from –40°C to +85°C.
- Can the reference voltage be adjusted?
Yes, the reference voltage can be set to any level within the range of 50mV to VCC.
- How does the power-down mode affect power consumption?
In power-down mode, the power dissipation is reduced to less than 60μW at 7.5kHz and a maximum of 3μA.
- What type of input does the ADS7822E support?
The ADS7822E supports a pseudo-differential input.
- How is the data output formatted?
The data is clocked out serially, most significant bit first, on the DOUT pin, synchronized by the DCLOCK input.
- What are some typical applications of the ADS7822E?
Typical applications include battery-operated systems, remote data acquisition, simultaneous sampling in multichannel systems, and isolated data acquisition.
