Overview
The ADS8881CDGSR is an 18-bit, 1-MSPS (mega-samples per second), true-differential input, analog-to-digital converter (ADC) produced by Texas Instruments. This device is designed for high-precision and low-power applications, offering a wide range of signal processing capabilities. The ADS8881 operates with a 2.5-V to 5-V external reference voltage, which is independent of the analog supply voltage (AVDD), allowing for flexible signal range selection without additional input scaling. The device features an SPI-compatible serial interface with daisy-chain support, enabling easy synchronization with digital hosts and cascading of multiple devices.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 18 Bits |
| Sample Rate | 1 MSPS |
| Input Type | True-Differential |
| Input Range | –VREF to +VREF |
| Common-Mode Voltage Range | 0 V to VREF with 90-dB CMRR (min) |
| Analog Supply Voltage (AVDD) | 2.7 V to 3.6 V |
| Digital Supply Voltage (DVDD) | 2.7 V to 3.6 V (Independent of AVDD) |
| Reference Voltage (REF) | 2.5 V to 5 V (Independent of AVDD) |
| 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 |
| Full-Scale Step Settling Time | 290 ns |
| Package Type | VSSOP-10, MSOP-10, VSON-10 |
Key Features
- No Latency Output
- SPI-compatible serial interface with daisy-chain option
- Excellent AC and DC performance:
- INL: ±1 LSB (typ), ±2.0 LSB (max) for ADS8881C
- DNL: ±1.0 LSB (max) for ADS8881C
- SNR: 100 dB, THD: –115 dB
- Wide operating range for AVDD, DVDD, and REF
- Low-power dissipation: 5.5 mW at 1 MSPS, 0.55 mW at 100 kSPS, 55 µW at 10 kSPS
- Optional busy-indicator bit for easy synchronization with digital hosts
Applications
- Automatic Test Equipment (ATE)
- Instrumentation and Process Controls
- Precision Medical Equipment
- Low-Power, Battery-Operated Instruments
Q & A
- What is the resolution of the ADS8881CDGSR?
The ADS8881CDGSR has a resolution of 18 bits.
- What is the sample rate of the ADS8881CDGSR?
The sample rate of the ADS8881CDGSR is 1 MSPS.
- What type of input does the ADS8881CDGSR support?
The ADS8881CDGSR supports true-differential input signals.
- What is the operating temperature range for the ADS8881C and ADS8881I models?
The operating temperature range for the ADS8881C is 0°C to +70°C, and for the ADS8881I, it is –40°C to +85°C.
- How much power does the ADS8881CDGSR consume at 1 MSPS?
The power consumption at 1 MSPS is 5.5 mW.
- What is the power-down current for the AVDD supply?
The power-down current for the AVDD supply is 50 nA.
- What is the full-scale step settling time for the ADS8881CDGSR?
The full-scale step settling time is 290 ns.
- What types of packages are available for the ADS8881CDGSR?
The ADS8881CDGSR is available in VSSOP-10, MSOP-10, and VSON-10 packages.
- Does the ADS8881CDGSR support daisy-chain operation?
- What are some common applications for the ADS8881CDGSR?
