Overview
The ADS8881IDGS is an 18-bit, 1-MSPS (mega-samples per second), true-differential input analog-to-digital converter (ADC) manufactured by Texas Instruments. This device is designed to operate with a wide range of signal inputs and offers high precision and low power consumption, making it suitable for various applications requiring accurate and efficient data acquisition.
The ADS8881 supports unipolar, true-differential analog input signals with a differential input swing of –VREF to +VREF, and it features a wide common-mode voltage range of 0 V to VREF with a minimum common-mode rejection ratio (CMRR) of 90 dB. The device also includes an SPI-compatible serial interface with daisy-chain option, facilitating easy integration and synchronization with digital hosts.
Key Specifications
| Specification | Value |
|---|---|
| Resolution | 18 Bits |
| Sample Rate | 1 MHz |
| Input Range | –VREF to +VREF |
| Common-Mode Voltage Range | 0 V to VREF |
| CMRR (min) | 90 dB |
| Integral Linearity (INL) | ADS8881C: ±1 LSB (typ), ±2.0 LSB (max) ADS8881I: ±1.5 LSB (typ), ±3.0 LSB (max) |
| Differential Linearity (DNL) | ADS8881C: ±1.0 LSB (max) ADS8881I: +1.5 and –1 LSB (max) |
| Signal-to-Noise Ratio (SNR) | 100 dB |
| Total Harmonic Distortion (THD) | –115 dB |
| Analog Supply Voltage (AVDD) | 2.7 V to 3.6 V |
| Digital Supply Voltage (DVDD) | 2.7 V to 3.6 V |
| Reference Voltage (REF) | 2.5 V to 5 V |
| Operating Temperature | ADS8881C: 0°C to +70°C ADS8881I: –40°C to +85°C |
| Power Consumption at 1 MSPS | 5.5 mW |
| Power-Down Current (AVDD) | 50 nA |
| Conversion Time | 500 ns to 710 ns |
| Acquisition Time | 290 ns |
| Package Types | MSOP-10 and VSON-10 |
Key Features
- True-Differential Input: Supports unipolar, true-differential analog input signals with a differential input swing of –VREF to +VREF.
- Wide Common-Mode Voltage Range: 0 V to VREF with a minimum CMRR of 90 dB.
- SPI-Compatible Serial Interface: Includes daisy-chain option for cascading multiple devices.
- Excellent AC and DC Performance: High SNR, low THD, and precise INL and DNL specifications.
- Low-Power Operation: Power consumption scales with speed, making it suitable for lower-speed applications.
- No Latency Output: Ensures real-time data conversion without delays.
- Optional Busy-Indicator Bit: Facilitates easy synchronization with the digital host.
Applications
- Automatic Test Equipment (ATE): Ideal for high-precision testing and measurement.
- Instrumentation and Process Controls: Suitable for industrial automation and process monitoring.
- Precision Medical Equipment: Used in medical devices requiring high accuracy and reliability.
- Low-Power, Battery-Operated Instruments: Optimized for devices that require minimal power consumption.
Q & A
- What is the resolution of the ADS8881 ADC?
The ADS8881 has an 18-bit resolution.
- What is the maximum sample rate of the ADS8881?
The maximum sample rate is 1 MHz.
- What is the input range of the ADS8881?
The input range is –VREF to +VREF.
- What is the common-mode voltage range of the ADS8881?
The common-mode voltage range is 0 V to VREF.
- What is the power consumption of the ADS8881 at 1 MSPS?
The power consumption at 1 MSPS is 5.5 mW.
- What are the package types available for the ADS8881?
The available package types are MSOP-10 and VSON-10.
- Does the ADS8881 support daisy-chain operation?
Yes, the ADS8881 supports daisy-chain operation through its SPI-compatible serial interface.
- What is the operating temperature range for the ADS8881I?
The operating temperature range for the ADS8881I is –40°C to +85°C.
- What is the typical integral linearity (INL) of the ADS8881C?
The typical INL for the ADS8881C is ±1 LSB.
- What is the signal-to-noise ratio (SNR) of the ADS8881?
The SNR of the ADS8881 is 100 dB.
