Overview
The ADS7844EG4, produced by Texas Instruments, is a 12-bit, 8-channel sampling analog-to-digital converter (ADC) with a synchronous serial interface. This device is designed for low power consumption and high-speed operation, making it ideal for battery-operated systems. It operates on a single supply voltage ranging from 2.7V to 5V and features an onboard multiplexer, which allows for either 8-channel single-ended or 4-channel differential input configurations. The ADS7844EG4 is available in 20-lead QSOP and 20-lead SSOP packages and is guaranteed to operate over a temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 12 bits |
| Number of Channels | 8 (single-ended) or 4 (differential) |
| Conversion Rate | Up to 200 kHz |
| Supply Voltage | 2.7V to 5V |
| Power Dissipation (typical) | 3 mW at 200 kHz and +5V supply |
| Shutdown Power Dissipation | Under 1 µW |
| Reference Voltage Range | 100 mV to VCC |
| Input Voltage Range | 0 V to VREF |
| Integral Nonlinearity (INL) and Differential Nonlinearity (DNL) | ±1 LSB |
| SINAD | 72 dB |
| Operating Temperature Range | –40°C to +85°C |
| Package Types | 20-lead QSOP and 20-lead SSOP |
Key Features
- Synchronous serial interface for low-cost isolation in remote data acquisition
- Onboard multiplexer for channel selection
- No missing codes
- Low power consumption with auto shutdown mode
- High-speed conversion rate up to 200 kHz
- Flexible reference voltage range (100 mV to VCC)
- Available in 20-lead QSOP and 20-lead SSOP packages
Applications
- Data Acquisition
- Test and Measurement
- Industrial Process Control
- Personal Digital Assistants
- Battery-Powered Systems
- Portable Multichannel Data Loggers
- Measurement Equipment
Q & A
- What is the resolution of the ADS7844EG4? The ADS7844EG4 has a resolution of 12 bits.
- How many channels does the ADS7844EG4 support? The ADS7844EG4 supports 8 single-ended or 4 differential channels.
- What is the maximum conversion rate of the ADS7844EG4? The maximum conversion rate is up to 200 kHz.
- What is the supply voltage range for the ADS7844EG4? The supply voltage range is from 2.7V to 5V.
- What is the typical power dissipation of the ADS7844EG4? The typical power dissipation is 3 mW at a 200 kHz throughput rate and a +5V supply.
- How does the shutdown mode affect power dissipation? The shutdown mode reduces power dissipation to under 1 µW.
- What is the range for the reference voltage (VREF)? The reference voltage can be varied between 100 mV and VCC.
- What is the input voltage range based on VREF? The input voltage range is from 0 V to VREF.
- What are the typical values for INL and DNL? The typical values for INL and DNL are ±1 LSB.
- What is the SINAD of the ADS7844EG4? The SINAD is 72 dB.
