Overview
The ADS7844E/2K5G4, produced by Texas Instruments, is a high-performance 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 and various data acquisition applications. The ADS7844 operates from a single supply voltage ranging from 2.7V to 5.25V and features an onboard multiplexer, allowing for both single-ended and differential input configurations. The device is fabricated on a 0.6µm CMOS process and includes a sample/hold function based on capacitive redistribution.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Resolution | - | - | 12 bits | - | - |
| Number of Channels | - | - | 8 | - | - |
| Conversion Rate | fSAMPLE = 200kHz, fCLK = 3.2MHz | - | 200kHz | - | Hz |
| Power Dissipation | +5V, fSAMPLE = 200kHz | - | 3mW | - | mW |
| Supply Voltage | - | 2.7V | - | 5.25V | V |
| Operating Temperature Range | - | -40°C | - | +85°C | °C |
| Integral Linearity Error (INL) | - | - | ±1 LSB | - | LSB |
| Differential Linearity Error (DNL) | - | - | ±1 LSB | - | LSB |
| Signal-to-Noise and Distortion Ratio (SINAD) | - | - | 72 dB | - | dB |
Key Features
- Single supply operation: 2.7V to 5.25V
- 8-channel single-ended or 4-channel differential input
- Up to 200kHz conversion rate
- High accuracy: ±1 LSB INL and DNL, no missing codes
- Low power dissipation: 3mW at 200kHz throughput rate
- Shutdown mode reduces power dissipation to under 1µW
- Synchronous serial interface for low-cost isolation in remote data acquisition
- Available in 20-lead QSOP and SSOP packages
- Operating temperature range: –40°C to +85°C
Applications
- Data acquisition systems
- Test and measurement equipment
- Industrial process control
- Personal digital assistants
- Battery-powered systems
- Portable multichannel data loggers
- Measurement equipment
Q & A
- What is the resolution of the ADS7844E/2K5G4?
The ADS7844E/2K5G4 has a 12-bit resolution.
- How many input channels does the ADS7844E/2K5G4 have?
The device has 8 input channels, which can be configured as single-ended or differential inputs.
- What is the maximum conversion rate of the ADS7844E/2K5G4?
The maximum conversion rate is up to 200kHz.
- What is the power dissipation of the ADS7844E/2K5G4 at 200kHz conversion rate?
The power dissipation is typically 3mW at a 200kHz throughput rate with a +5V supply.
- What are the operating temperature and supply voltage ranges for the ADS7844E/2K5G4?
The operating temperature range is –40°C to +85°C, and the supply voltage range is 2.7V to 5.25V.
- What is the integral linearity error (INL) and differential linearity error (DNL) of the ADS7844E/2K5G4?
The INL and DNL are both ±1 LSB.
- Does the ADS7844E/2K5G4 have a shutdown mode?
Yes, the device has a shutdown mode that reduces power dissipation to under 1µW.
- What types of packages are available for the ADS7844E/2K5G4?
The device is available in 20-lead QSOP and SSOP packages.
- What are some typical applications of the ADS7844E/2K5G4?
Typical applications include data acquisition systems, test and measurement equipment, industrial process control, personal digital assistants, and battery-powered systems.
- How does the ADS7844E/2K5G4 handle analog input configurations?
The device can handle both single-ended and differential analog input configurations via an onboard multiplexer.
