Overview
The ADS8865IDGSR is a 16-bit, 400-kSPS (kilosamples per second), true-differential input, analog-to-digital converter (ADC) produced by Texas Instruments. This device is part of a high-speed, successive approximation register (SAR) ADC family and is known for its high performance and low power consumption. The ADS8865 operates with a 2.5-V to 5-V external reference voltage, allowing for a wide selection of signal ranges without additional input signal scaling. The reference voltage setting is independent of, and can exceed, the analog supply voltage (AVDD). The device features an SPI-compatible serial interface with daisy-chain option, making it suitable for cascading multiple devices and easy synchronization with digital hosts.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 16 | Bits |
| Sample Rate | 400 | kSPS |
| Input Type | True-Differential | |
| Input Range | –VREF to +VREF | |
| Common-Mode Voltage Range | 0 V to VREF | |
| CMRR (min) | 90 dB | |
| SNR | 96 dB | |
| THD | –115 dB | |
| INL (max) | ±1.0 LSB | |
| DNL (max) | ±1.0 LSB | |
| AVDD | 2.7 V to 3.6 V | |
| DVDD | 1.65 V to 3.6 V | |
| REF | 2.5 V to 5 V | |
| Operating Temperature | –40°C to +85°C | |
| Power Consumption at 400 kSPS | 2.6 mW | |
| Power-Down Current (AVDD) | 50 nA | |
| Full-Scale Step Settling Time | 1200 ns | |
| Packages | MSOP-10, SON-10 |
Key Features
- No Latency Output
- SPI™-Compatible Serial Interface with Daisy-Chain Option
- Unipolar, True-Differential Input Range: –VREF to +VREF
- Wide Common-Mode Voltage Range: 0 V to VREF with 90-dB CMRR (min)
- Excellent AC and DC Performance: SNR: 96 dB, THD: –115 dB, INL: ±1.0 LSB (max), DNL: ±1.0 LSB (max)
- Wide Operating Range: AVDD: 2.7 V to 3.6 V, DVDD: 1.65 V to 3.6 V, REF: 2.5 V to 5 V
- Low-Power Dissipation: 2.6 mW at 400 kSPS, 0.65 mW at 100 kSPS, 65 µW at 10 kSPS
- Power-Down Current (AVDD): 50 nA
- Full-Scale Step Settling to 16 Bits: 1200 ns
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 ADS8865 ADC?
The ADS8865 has a resolution of 16 bits. - What is the maximum sample rate of the ADS8865?
The maximum sample rate is 400 kSPS. - What type of input does the ADS8865 support?
The ADS8865 supports true-differential analog input signals. - What is the common-mode voltage range of the ADS8865?
The common-mode voltage range is 0 V to VREF with a minimum CMRR of 90 dB. - What are the power consumption levels at different sample rates?
The power consumption is 2.6 mW at 400 kSPS, 0.65 mW at 100 kSPS, and 65 µW at 10 kSPS. - What is the power-down current of the ADS8865?
The power-down current is 50 nA. - What is the full-scale step settling time of the ADS8865?
The full-scale step settling time is 1200 ns. - What are the available packages for the ADS8865?
The ADS8865 is available in MSOP-10 and SON-10 packages. - What is the operating temperature range of the ADS8865?
The operating temperature range is –40°C to +85°C. - Does the ADS8865 support daisy-chain operation?
Yes, the ADS8865 supports daisy-chain operation through its SPI-compatible serial interface.
