Overview
The ADS7844E is a high-performance, 12-bit, 8-channel sampling analog-to-digital converter (ADC) produced by Texas Instruments. It features a synchronous serial interface and is designed for reliable data conversion in various applications. The device operates on a single supply voltage ranging from 2.7V to 5V and is guaranteed down to 2.7V operation. It includes an onboard multiplexer, allowing for either 8-channel single-ended or 4-channel differential input configurations. The ADS7844E is ideal for battery-operated systems, such as personal digital assistants, portable multichannel data loggers, and measurement equipment, due to its low power consumption and high speed capabilities.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Resolution | Number of bits | 12 bits |
| Number of Channels | Single-ended or differential channels | 8 single-ended or 4 differential |
| Supply Voltage | Operating voltage range | 2.7V to 5V |
| Conversion Rate | Maximum conversion rate | Up to 200kHz |
| Integral Nonlinearity (INL) and Differential Nonlinearity (DNL) | Maximum INL and DNL | ±1 LSB |
| Signal-to-Noise and Distortion Ratio (SINAD) | Typical SINAD | 72dB |
| Power Dissipation | Typical power dissipation at 200kHz and +5V supply | 3mW |
| Shutdown Mode Power Dissipation | Power dissipation in shutdown mode | Under 1µW |
| Operating Temperature Range | Temperature range for specified performance | –40°C to +85°C |
| Package Types | Available package types | 20-lead QSOP and 20-lead SSOP |
Key Features
- SINGLE SUPPLY: Operates on a single supply voltage from 2.7V to 5V.
- MULTI-CHANNEL INPUT: Supports 8-channel single-ended or 4-channel differential input configurations.
- HIGH CONVERSION RATE: Up to 200kHz conversion rate.
- HIGH ACCURACY: ±1 LSB maximum integral nonlinearity (INL) and differential nonlinearity (DNL), with no missing codes.
- HIGH SIGNAL QUALITY: 72dB typical signal-to-noise and distortion ratio (SINAD).
- LOW POWER CONSUMPTION: Typical power dissipation of 3mW at 200kHz and +5V supply, with a shutdown mode reducing power dissipation to under 1µW.
- SERIAL INTERFACE: Synchronous serial interface for communication.
- COMPACT PACKAGING: Available in 20-lead QSOP and 20-lead SSOP packages.
Applications
- DATA ACQUISITION: Suitable for data acquisition systems requiring multiple channel measurements.
- TEST AND MEASUREMENT: Ideal for test and measurement equipment due to its high accuracy and speed.
- INDUSTRIAL PROCESS CONTROL: Used in industrial automation applications that require reliable and accurate data conversion.
- PERSONAL DIGITAL ASSISTANTS: Suitable for battery-operated systems such as personal digital assistants and portable multichannel data loggers.
- BATTERY-POWERED SYSTEMS: Ideal for battery-powered systems due to its low power consumption.
Q & A
- Q: What is the resolution of the ADS7844E?
A: The ADS7844E has a 12-bit resolution. - Q: How many channels does the ADS7844E support?
A: The ADS7844E supports 8 single-ended or 4 differential channels. - Q: What is the operating voltage range of the ADS7844E?
A: The operating voltage range is from 2.7V to 5V. - Q: What is the maximum conversion rate of the ADS7844E?
A: The maximum conversion rate is up to 200kHz. - Q: What is the typical power dissipation of the ADS7844E at 200kHz and +5V supply?
A: The typical power dissipation is 3mW. - Q: What is the power dissipation in shutdown mode?
A: The power dissipation in shutdown mode is under 1µW. - Q: What are the available package types for the ADS7844E?
A: The ADS7844E is available in 20-lead QSOP and 20-lead SSOP packages. - Q: What is the operating temperature range for the ADS7844E?
A: The operating temperature range is from –40°C to +85°C. - Q: What are some typical applications of the ADS7844E?
A: Typical applications include data acquisition, test and measurement, industrial process control, personal digital assistants, and battery-powered systems. - Q: Does the ADS7844E have a serial interface?
A: Yes, the ADS7844E features a synchronous serial interface for communication.
