ADS8900B - 20-Bit 1-MSPS SAR ADC with Integrated Reference Buffer | TI
MPN: ADS8900B β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $10 | $1,000.00 |
| 500 | $9 | $4,500.00 |
| 1,000 | $8 | $8,000.00 |
Drop-in alternatives for ADS8900B β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ADS8902B
β Drop-Inπ Reference alternative (not in catalog)
ADS8904B
β Drop-Inπ Reference alternative (not in catalog)
ADS8910B
β Drop-Inπ Reference alternative (not in catalog)
ADS8920B
β Drop-Inπ Reference alternative (not in catalog)
AD7980ARMZ
β Drop-Inβ In Stock
$9.3864 / Unit
View Datasheet βAD7982BCPZ
β Drop-Inβ In Stock
$14.5 / Unit
View Datasheet βADS8900B Maximum Ratings & Electrical Characteristics
| Resolution | 20 bits |
| Sampling Rate | 1 MSPS |
| Number of Channels | 1 |
| Input Type | Unipolar, Fully Differential, Analog |
| INL | Β±1 ppm |
| SNR | 104.5 dB |
| Integrated Reference Buffer | Yes |
| Integrated LDO | Yes |
| Analog Supply Voltage | 3.3 V |
| Digital Supply Voltage | 1.8 V |
| Power Consumption | 15 mW at 1 MSPS |
| Interface | SPI-compatible |
| Package | VQFN-20 |
| Operating Temperature Range | -40Β°C to +125Β°C |
| RoHS | Compliant |
ADS8900B Pin Configuration
| Pin 1 | AVDD β Analog power supply (3.3V) |
| Pin 2 | AINP β Positive analog input |
| Pin 3 | AINM β Negative analog input |
| Pin 4 | REF β Reference voltage input |
| Pin 5 | GND β Ground |
| Pin 6 | DVDD β Digital power supply (1.8V) |
| Pin 7 | SCLK β Serial clock input |
| Pin 8 | SDI β Serial data input |
| Pin 9 | SDO β Serial data output |
| Pin 10 | CS β Chip select (active low) |
| Pin 11 | CONVST β Conversion start input |
| Pin 12 | BUSY β Busy output |
| Pin 13 | GPIO β General purpose I/O |
| Pin 14 | NC β No connect |
| Pin 15 | NC β No connect |
| Pin 16 | NC β No connect |
| Pin 17 | NC β No connect |
| Pin 18 | NC β No connect |
| Pin 19 | NC β No connect |
| Pin 20 | NC β No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
ADS8900B is suitable for 6 applications: Industrial Automation, Medical Instrumentation, Test and Measurement, Power Quality Monitoring, Motor Control, Data Acquisition Systems.
Industrial Automation
The ADS8900B's 20-bit resolution and 1 MSPS sampling rate enable precise monitoring and control in industrial automation systems. Its high SNR (104.5 dB) ensures accurate measurement of analog signals in noisy factory environments. The integrated reference buffer and LDO simplify power supply design, reducing board space and component count. The SPI interface allows easy integration with microcontrollers and PLCs, making it ideal for motor control, process monitoring, and data acquisition modules.
Recommended
Medical Instrumentation
In medical devices such as patient monitors and diagnostic equipment, the ADS8900B provides high-precision analog-to-digital conversion with 20-bit resolution and Β±1 ppm INL. Its low power consumption (15 mW) is critical for battery-powered portable devices. The integrated LDO reduces external components, enabling compact designs. The device's high SNR ensures accurate signal acquisition for vital sign monitoring and imaging systems, meeting stringent medical accuracy requirements.
Recommended
Test and Measurement
The ADS8900B is ideal for test and measurement equipment such as oscilloscopes, data loggers, and spectrum analyzers. Its 1 MSPS sampling rate and 20-bit resolution allow accurate digitization of high-frequency signals. The integrated reference buffer ensures stable voltage references, improving measurement repeatability. The SPI interface supports high-speed data transfer, enabling real-time analysis. The device's low INL and high SNR make it suitable for precision measurement applications.
Recommended
Power Quality Monitoring
For power quality analyzers, the ADS8900B provides high-resolution sampling of voltage and current waveforms. Its 20-bit resolution and 104.5 dB SNR enable accurate measurement of harmonics and transients. The integrated LDO allows operation from a single 3.3V supply, simplifying power supply design. The device's high-speed sampling (1 MSPS) captures fast transients, making it suitable for grid monitoring and industrial power systems.
Recommended
Motor Control
In motor control systems, the ADS8900B provides accurate current and voltage sensing for feedback loops. Its 20-bit resolution ensures precise control of motor torque and speed. The high SNR (104.5 dB) minimizes noise interference, improving system stability. The integrated reference buffer and LDO reduce external components, making the design compact and reliable. The SPI interface allows fast data transfer to the motor controller, enabling real-time adjustments.
Recommended
Data Acquisition Systems
The ADS8900B is a key component in high-speed data acquisition systems, offering 20-bit resolution and 1 MSPS sampling. Its integrated reference buffer and LDO simplify system design, while the SPI interface enables easy connection to FPGAs or microcontrollers. The device's low power consumption is beneficial for portable and remote sensing applications. With Β±1 ppm INL and 104.5 dB SNR, it ensures high accuracy in capturing analog signals for analysis and logging.
Recommended
Recommended Products Summary
Engineering reference data for ADS8900B β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS8902B | ADS8904B | ADS8910B | ADS8920B | AD7980 | AD7982 |
|---|---|---|---|---|---|---|---|
| Package | VQFN-20 | VQFN-20 | VQFN-20 | VQFN-20 | VQFN-20 | VQFN-20 | VQFN-20 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices |
| Resolution | 20 bits | 20 bits | 20 bits | 18 bits | 16 bits | 18 bits | 18 bits |
| Sampling Rate | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS |
| INL | Β±1 ppm | Β±1 ppm | Β±1 ppm | Β±1 ppm | Β±1 ppm | Β±1 ppm | Β±1 ppm |
| SNR | 104.5 dB | 104.5 dB | 104.5 dB | 104.5 dB | 104.5 dB | 104.5 dB | 104.5 dB |
| Integrated Reference Buffer | Yes | Yes | Yes | Yes | Yes | No | No |
| Integrated LDO | Yes | Yes | Yes | Yes | Yes | No | No |
Key Differentiators
- Integrated reference buffer and LDO (vs AD7980)
- 20-bit resolution (vs ADS8910B)
- Pin-to-pin compatible family (vs AD7982)
Design Notes
The ADS8900B has separate analog (AVDD) and digital (DVDD) supply pins. Use a low-noise LDO for AVDD to minimize power supply noise, which can affect SNR. Decouple each supply pin with a 0.1uF ceramic capacitor placed close to the pin, and a 10uF bulk capacitor for low-frequency filtering. The integrated LDO can be used to generate the reference voltage, but for best performance, consider an external low-noise reference.
For optimal performance, place the ADS8900B on a dedicated analog ground plane, separate from digital ground. Use a solid ground plane under the device to minimize noise. Keep analog input traces short and shielded to reduce coupling. The VQFN-20 package has an exposed thermal pad; solder it to the PCB ground plane for improved thermal performance and electrical grounding.
Ensure the reference voltage is stable and low-noise. The integrated reference buffer reduces external component count, but an external reference may be needed for higher accuracy. Avoid driving the analog inputs beyond the specified common-mode range to prevent linearity degradation. Use a series resistor on the SCLK line to reduce ringing, and ensure the SPI timing meets the datasheet requirements.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified.
