Overview
The ADS8861IDRCR is a 16-bit, 1-MSPS (mega-samples per second), true-differential analog-to-digital converter (ADC) produced by Texas Instruments. This device is designed for high-performance applications requiring low power consumption and excellent AC and DC performance. It operates with a 2.5-V to 5-V external reference voltage, offering a wide range of signal inputs without additional scaling. The ADS8861 features an SPI-compatible serial interface that supports daisy-chain operation, making it suitable for cascading multiple devices.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Resolution | 16 | - | - | Bits |
| Sample Rate | - | 1 | - | MSPS |
| Analog Supply Voltage (AVDD) | 2.7 | 3 | 3.6 | V |
| Digital Supply Voltage (DVDD) | 2.7 | 3 | 3.6 | V |
| Reference Voltage (VREF) | 2.5 | - | 5 | V |
| Operating Temperature Range | -40 | - | 85 | °C |
| Power Dissipation at 1 MSPS | - | 5.5 | - | mW |
| Power-Down Current | - | - | 50 | nA |
| Integral Linearity (INL) | -1 | - | 1 | LSB |
| Differential Linearity (DNL) | -0.99 | - | 1 | LSB |
| Common-Mode Rejection Ratio (CMRR) | 90 | - | - | dB |
Key Features
- True-Differential Input: Supports unipolar, true-differential analog input signals with a differential input swing of –VREF to +VREF.
- Low Power Consumption: Operates at 5.5 mW at 1 MSPS, 0.55 mW at 100 kSPS, and 55 µW at 10 kSPS.
- SPI-Compatible Serial Interface: Supports daisy-chain operation for cascading multiple devices.
- Wide Common-Mode Voltage Range: Common-mode voltage can be any value in the range of 0 V to +VREF.
- Excellent AC and DC Performance: Features SNR of 96 dB, THD of –115 dB, and INL/DNL of ±1.0 LSB.
- Low Latency Output: No latency output and fast conversion time of 500 ns.
- Power-Down Mode: Automatically enters power-down state at the end of every conversion, reducing power consumption to 50 nA.
Applications
- Automatic Test Equipment (ATE): Suitable for high-speed data acquisition and testing.
- Instrumentation and Process Controls: Ideal for precision measurement and control systems.
- Precision Medical Equipment: Used in medical devices requiring high accuracy and low noise.
- Low-Power, Battery-Operated Instruments: Optimized for low-power operation, making it suitable for battery-powered devices.
Q & A
- What is the resolution of the ADS8861 ADC?
The ADS8861 has a resolution of 16 bits.
- What is the maximum sample rate of the ADS8861?
The maximum sample rate is 1 MSPS.
- What is the operating temperature range of the ADS8861?
The operating temperature range is –40°C to +85°C.
- What is the power consumption of the ADS8861 at 1 MSPS?
The power consumption at 1 MSPS is 5.5 mW.
- Does the ADS8861 support daisy-chain operation?
Yes, the ADS8861 supports daisy-chain operation through its SPI-compatible serial interface.
- What is the common-mode rejection ratio (CMRR) of the ADS8861?
The CMRR is 90 dB.
- How does the ADS8861 handle power-down mode?
The device automatically enters a power-down state at the end of every conversion, reducing power consumption to 50 nA.
- What are the typical integral and differential linearity specifications of the ADS8861?
The typical integral linearity (INL) and differential linearity (DNL) are both ±1.0 LSB.
- What is the reference voltage range for the ADS8861?
The reference voltage range is 2.5 V to 5 V.
- What are some common applications of the ADS8861?
Common applications include automatic test equipment, instrumentation and process controls, precision medical equipment, and low-power, battery-operated instruments.
