Overview
The ADS8900BRGER, produced by Texas Instruments, is a high-speed, single-channel, 20-bit successive-approximation-register (SAR) analog-to-digital converter (ADC). This device is part of the ADS890xB family, which includes pin-to-pin compatible variants with different sample rates. The ADS8900B is specifically designed for high-performance data acquisition, featuring an integrated reference buffer and a low-dropout regulator (LDO), enabling low-power, single-supply operation.
The device boasts excellent AC and DC performance, including a signal-to-noise ratio (SNR) of 104.5 dB and a total harmonic distortion (THD) of –125 dB. It supports unipolar and fully differential analog input signals and operates over an extended temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 20 bits |
| Sample Rate | 1 MSPS |
| Input Range | Unipolar Differential: ±VREF |
| VREF Input Range | 2.5 V to 5 V |
| SNR | 104.5 dB |
| THD | –125 dB |
| DNL | ±0.2 ppm |
| INL | ±1 ppm |
| Power Consumption | 21 mW at 1 MSPS |
| Temperature Range | –40°C to +125°C |
| Package | 4-mm × 4-mm VQFN (24 pins) |
| Digital Interface | Enhanced-SPI, compatible with standard SPI |
| SCLK Frequency | Up to 22 MHz at 1 MSPS |
Key Features
- Integrated LDO and Reference Buffer: Enables low-power, single-supply operation and supports burst mode of data acquisition.
- Enhanced-SPI Digital Interface: Achieves high throughput at lower clock speeds, simplifying board layout and lowering system cost. Compatible with standard SPI interface.
- High Performance: Excellent AC and DC performance with SNR of 104.5 dB and THD of –125 dB.
- Low Power Consumption: Consumes only 21 mW at 1 MSPS with internal reference buffer and LDO enabled.
- Configurable Data Parity Output: Improves system reliability by validating ADC data using parity bits.
- Small Footprint: 4-mm × 4-mm VQFN package.
Applications
- Test and Measurement: Ideal for applications requiring fast, low-noise, and low-distortion data acquisition.
- Medical Devices: Suitable for medical applications due to its high precision and low power consumption.
- Industrial Automation: Used in industrial settings for high-speed data acquisition with minimal system cost.
- FPGA and DSP Applications: Enhanced-SPI feature makes it ideal for applications involving FPGAs and DSPs.
Q & A
- What is the resolution of the ADS8900BRGER?
The ADS8900BRGER has a resolution of 20 bits.
- What is the maximum sample rate of the ADS8900BRGER?
The maximum sample rate of the ADS8900BRGER is 1 MSPS.
- What is the input range of the ADS8900BRGER?
The input range is unipolar differential, ±VREF, where VREF ranges from 2.5 V to 5 V.
- What is the SNR of the ADS8900BRGER?
The signal-to-noise ratio (SNR) is 104.5 dB.
- Does the ADS8900BRGER have an integrated LDO and reference buffer?
Yes, it has an integrated LDO and reference buffer, enabling low-power, single-supply operation.
- What is the power consumption of the ADS8900BRGER at 1 MSPS?
The power consumption is 21 mW at 1 MSPS with the internal reference buffer and LDO enabled.
- What digital interface does the ADS8900BRGER use?
The device uses an Enhanced-SPI digital interface, which is compatible with standard SPI.
- What is the maximum SCLK frequency for the ADS8900BRGER?
The maximum SCLK frequency is up to 22 MHz at 1 MSPS.
- Does the ADS8900BRGER support data parity output?
Yes, it supports configurable data parity output to improve system reliability.
- What are the typical applications of the ADS8900BRGER?
Typical applications include test and measurement, medical devices, industrial automation, and applications involving FPGAs and DSPs.
