Overview
The ADS7818EB/2K5 from Texas Instruments is a 12-bit sampling analog-to-digital converter (A/D) that includes a sample/hold circuit, an internal 2.5V reference, and a synchronous serial interface. This device is designed for low power consumption and high-speed operation, making it ideal for battery-operated systems such as wireless communication devices, portable multi-channel data loggers, and spectrum analyzers. The ADS7818EB/2K5 is available in MSOP-8 and mini-DIP-8 packages and operates over a temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Resolution | 12 | 12 | 12 | Bits |
| Integral Linearity Error | ±1 | ±2 | ±0.5 | LSB |
| Differential Linearity Error | ±0.8 | ±0.5 | ±1 | LSB |
| Offset Error | ±2 | ±5 | ±1 | LSB |
| Gain Error (25°C) | ±12 | ±30 | ±7 | LSB |
| Conversion Time | 1.625 | µs | ||
| Acquisition Time | 0.350 | µs | ||
| Throughput Rate | 500 | kHz | ||
| Power Dissipation (fSAMPLE = 500kHz) | 11 | mW | ||
| Power Dissipation (Power Down) | 2.5 | mW | ||
| Operating Temperature Range | –40 | +85 | °C |
Key Features
- 12-bit resolution with no missing codes.
- Internal 2.5V reference voltage, which can be overdriven by an external reference voltage.
- Synchronous serial interface for low-cost isolation in remote data acquisition.
- Low power consumption: 11mW at 500kHz throughput rate and 2.5mW in power-down mode.
- High-speed operation with a conversion time of 1.625µs and an acquisition time of 0.350µs.
- CMOS logic family with straight binary data format.
- Operating temperature range of –40°C to +85°C.
- Available in MSOP-8 and mini-DIP-8 packages.
Applications
- Battery-operated systems such as wireless communication devices.
- Portable multi-channel data loggers.
- Spectrum analyzers.
- Remote data acquisition systems requiring low-cost isolation.
Q & A
- What is the resolution of the ADS7818EB/2K5?
The ADS7818EB/2K5 has a 12-bit resolution.
- What is the typical power dissipation of the ADS7818EB/2K5 at 500kHz throughput rate?
The typical power dissipation is 11mW at a 500kHz throughput rate.
- Can the internal reference voltage be overdriven by an external voltage?
- What is the operating temperature range of the ADS7818EB/2K5?
The operating temperature range is –40°C to +85°C.
- What are the available package types for the ADS7818EB/2K5?
The device is available in MSOP-8 and mini-DIP-8 packages.
- How does the device enter power-down mode?
The device enters power-down mode if the CONV input is kept LOW during the conversion and is LOW at the start of the 13th clock cycle.
- What is the format of the output data from the ADS7818EB/2K5?
The output data is in straight binary format.
- What is the typical acquisition time of the ADS7818EB/2K5?
The typical acquisition time is 0.350µs.
- Can the ADS7818EB/2K5 operate with an external reference voltage?
- What is the signal-to-noise ratio (SNR) of the ADS7818EB/2K5 at 100kHz input frequency?
The SNR is typically 72dB at a 100kHz input frequency.
