Overview
The ADS7844E/2K5, 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, 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, allowing for either single-ended or differential input configurations. The ADS7844E/2K5 is suitable for various applications, including data acquisition, test and measurement, industrial process control, and personal digital assistants.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Analog Input Full-Scale Input Span | VREF | 0 | VREF | V | |
| Conversion Rate | fSAMPLE | 200kHz | Hz | ||
| Integral Non-Linearity (INL) | ±1 | LSB | |||
| Differential Non-Linearity (DNL) | ±1 | LSB | |||
| Signal-to-Noise and Distortion Ratio (SINAD) | 72 | dB | |||
| Power Supply Voltage | +VCC | 2.7 | 5.25 | V | |
| Quiescent Current | fSAMPLE = 12.5kHz | 300 | 550 | 900 | µA |
| Power Dissipation | fSAMPLE = 200kHz, +VCC = 5V | 3 | mW | ||
| Operating Temperature Range | –40 | +85 | °C |
Key Features
- 8-channel single-ended or 4-channel differential input configuration
- Up to 200kHz conversion rate
- No missing codes
- Low power dissipation: 3mW at 200kHz throughput rate and +5V supply
- Shutdown mode reducing power dissipation to under 1µW
- Synchronous serial interface
- Available in 20-lead QSOP and 20-lead SSOP packages
- Operating temperature range: –40°C to +85°C
Applications
- Data acquisition
- Test and measurement
- Industrial process control
- Personal digital assistants
- Battery-powered systems
- Portable multichannel data loggers and measurement equipment
Q & A
- What is the conversion rate of the ADS7844E/2K5? The conversion rate of the ADS7844E/2K5 can be up to 200kHz.
- What are the possible input configurations for the ADS7844E/2K5? The device can be configured for either 8-channel single-ended or 4-channel differential inputs.
- What is the power dissipation of the ADS7844E/2K5 at 200kHz throughput rate and +5V supply? The power dissipation is typically 3mW.
- How does the shutdown mode affect power dissipation? The shutdown mode reduces power dissipation to under 1µW.
- What is the operating temperature range of the ADS7844E/2K5? The operating temperature range is –40°C to +85°C.
- What types of packages are available for the ADS7844E/2K5? The device is available in 20-lead QSOP and 20-lead SSOP packages.
- What is the signal-to-noise and distortion ratio (SINAD) of the ADS7844E/2K5? The SINAD is typically 72dB.
- Can the ADS7844E/2K5 operate with different reference voltages? Yes, the reference voltage (VREF) can be varied between 0.1V and VCC.
- How many clock cycles are required for a complete conversion? A complete conversion requires 24 clock cycles on the DCLK input, spread over three serial communications.
- What is the typical quiescent current of the ADS7844E/2K5 at fSAMPLE = 12.5kHz? The typical quiescent current is 300µA.
