Overview
The ADS7818EB/2K5G4, produced by Texas Instruments, is a 12-bit sampling analog-to-digital converter (A/D) that features a sample/hold circuit, an internal 2.5V reference, and a synchronous serial interface. This device is designed for high-speed, low-power applications and is particularly suited for battery-operated systems such as wireless communication devices, portable multi-channel data loggers, and spectrum analyzers. The ADS7818EB/2K5G4 operates over a temperature range of –40°C to +85°C and is available in MSOP-8 and mini-DIP-8 packages.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Resolution | 12 | 12 | 12 | Bits |
| Integral Linearity Error | ±0.5 | ±1 | ±2 | LSB |
| Differential Linearity Error | ±0.5 | ±0.8 | ±1 | LSB |
| Offset Error | ±1 | ±2 | ±5 | LSB |
| Gain Error (25°C) | ±7 | ±12 | ±15 | LSB |
| Conversion Time | 1.625 | µs | ||
| Acquisition Time | 0.350 | µs | ||
| Throughput Rate | 500 | kHz | ||
| Power Supply Voltage | 4.75 | 5.0 | 5.25 | V |
| Power Dissipation (fSAMPLE = 500kHz) | 11 | 20 | 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
- High-speed conversion rate up to 500kHz
- Low power consumption: 11mW at 500kHz throughput and 2.5mW in power-down mode
- Synchronous serial interface for data transfer
- CMOS logic levels for digital inputs and outputs
- Small package options: MSOP-8 and mini-DIP-8
- Wide operating temperature range: –40°C to +85°C
- Low noise and high signal-to-noise ratio (SNR) and signal-to-noise and distortion (SINAD) ratios
Applications
- Battery-operated systems such as wireless communication devices
- Portable multi-channel data loggers
- Spectrum analyzers
- Remote data acquisition systems where low-cost isolation is required
Q & A
- What is the resolution of the ADS7818EB/2K5G4? The resolution is 12 bits.
- What is the typical power dissipation of the ADS7818EB/2K5G4 at 500kHz throughput? The typical power dissipation is 11mW.
- Can the internal reference voltage be overdriven by an external voltage? Yes, the internal reference can be overdriven by an external voltage in the range of 2.0V to 2.55V.
- What is the operating temperature range of the ADS7818EB/2K5G4? The operating temperature range is –40°C to +85°C.
- What are the package options for the ADS7818EB/2K5G4? The device is available in MSOP-8 and mini-DIP-8 packages.
- How does the power-down mode affect power consumption? In power-down mode, the power dissipation is reduced to 2.5mW.
- What is the maximum throughput rate of the ADS7818EB/2K5G4? The maximum throughput rate is 500kHz.
- What type of logic levels does the ADS7818EB/2K5G4 use for digital inputs and outputs? The device uses CMOS logic levels.
- What are some typical applications for the ADS7818EB/2K5G4? Typical applications include battery-operated systems, portable data loggers, spectrum analyzers, and remote data acquisition systems.
- How is the serial data output formatted? The serial data output is in straight binary format, transmitted most significant bit first, but can also be configured to transmit least significant bit first.
