AD7984BCPZ - 18-Bit 1.33 MSPS SAR ADC | Analog Devices
MPN: AD7984BCPZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $24.1 | $24.10 |
| 10 | $22.5 | $225.00 |
| 100 | $20.8 | $2,080.00 |
| 500 | $19.2 | $9,600.00 |
| 1,000 | $17.6 | $17,600.00 |
Drop-in alternatives for AD7984BCPZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesAD7984BCPZ Maximum Ratings & Electrical Characteristics
| Resolution | 18 bits |
| Sampling Rate | 1.33 MSPS |
| Number of Inputs | 1 |
| Input Type | Differential |
| Data Interface | SPI |
| Architecture | SAR |
| Reference Type | External |
| Voltage - Supply, Analog | 2.5 V |
| Voltage - Supply, Digital | 1.8 V to 5 V |
| INL (Max) | ±2.25 LSB |
| Dynamic Range | 99.7 dB typical |
| SNR (Typical) | 99 dB |
| Power Dissipation | 10.5 mW at 1.33 MSPS |
| Operating Temperature | -40°C to +125°C |
| Package | 10-LFCSP-WD (3x3 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
AD7984BCPZ Pin Configuration
| Pin 1 | IN+ — Positive analog input |
| Pin 2 | IN- — Negative analog input |
| Pin 3 | GND — Ground |
| Pin 4 | VDD — Power supply (2.5V) |
| Pin 5 | REF — Reference voltage input |
| Pin 6 | SDI — Serial data input (for daisy-chain) |
| Pin 7 | SDO — Serial data output |
| Pin 8 | SCK — Serial clock input |
| Pin 9 | CNV — Convert input (start conversion) |
| Pin 10 | VIO — Digital interface supply |
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
AD7984BCPZ is suitable for 6 applications: High-Speed Data Acquisition, Medical Imaging, Spectroscopy, Vibration Analysis, Portable Instrumentation, Industrial Process Control.
High-Speed Data Acquisition
The AD7984BCPZ's 1.33 MSPS sampling rate and 18-bit resolution make it ideal for high-speed data acquisition systems. Its low power dissipation of 10.5 mW allows dense multi-channel designs without excessive heat. The SPI interface simplifies connection to microcontrollers and DSPs, enabling rapid data transfer. The true differential input rejects common-mode noise, ensuring accurate capture of small signals in noisy industrial environments.
Recommended
Medical Imaging
In medical imaging systems such as X-ray and ultrasound, the AD7984BCPZ provides the high resolution and dynamic range needed to capture fine anatomical details. Its 99.7 dB dynamic range ensures weak echoes are distinguished from noise. The low power consumption is beneficial for portable devices. The small LFCSP package allows compact probe designs. The SPI interface enables easy integration with imaging processors.
Recommended
Spectroscopy
The AD7984BCPZ is well-suited for spectroscopy applications where precise measurement of light intensity is required. Its 18-bit resolution and low INL (±2.25 LSB) ensure accurate representation of spectral peaks. The high SNR (99 dB) minimizes noise, allowing detection of weak spectral lines. The external reference allows calibration to the specific sensor output. The SPI interface supports high-speed data streaming to analysis software.
Recommended
Vibration Analysis
For vibration monitoring in industrial machinery, the AD7984BCPZ captures high-frequency vibration signals with 18-bit precision. Its 1.33 MSPS sampling rate allows analysis of frequencies up to 600 kHz, covering most mechanical vibrations. The low power dissipation enables deployment in wireless sensor nodes. The differential input reduces electromagnetic interference from motors. The SPI interface allows daisy-chaining multiple ADCs for multi-axis monitoring.
Recommended
Portable Instrumentation
The AD7984BCPZ's low power consumption (10.5 mW) and small package make it ideal for portable instruments like handheld multimeters and data loggers. Its 18-bit resolution ensures accurate measurements in field applications. The wide operating temperature range (-40°C to +125°C) allows use in harsh environments. The SPI interface simplifies connection to low-power microcontrollers. The external reference enables calibration for different measurement ranges.
Recommended
Industrial Process Control
In industrial process control, the AD7984BCPZ provides accurate conversion of sensor signals for monitoring and control loops. Its 18-bit resolution and low INL ensure precise measurement of temperature, pressure, and flow. The true differential input rejects common-mode noise from long cable runs. The SPI interface supports daisy-chaining multiple ADCs for multi-channel systems. The wide temperature range and low power make it suitable for field-mounted transmitters.
Recommended
Recommended Products Summary
Engineering reference data for AD7984BCPZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7984-1BCPZ-RL7 | AD7984-5BCPZ-R2 | AD7982BCPZ | AD7980BCPZ-RL7 |
|---|---|---|---|---|---|
| Package | 10-LFCSP-WD (3x3 mm) | 10-LFCSP-WD (3x3 mm) | 10-LFCSP-WD (3x3 mm) | 10-LFCSP-WD (3x3 mm) | 10-LFCSP-WD (3x3 mm) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 18 bits | 18 bits | 16 bits | 18 bits | 16 bits |
| Sampling Rate | 1.33 MSPS | 1.33 MSPS | 1.33 MSPS | 1 MSPS | 1 MSPS |
| Power Dissipation | 10.5 mW | 10.5 mW | 10.5 mW | 10.5 mW | 7 mW |
| INL (Max) | ±2.25 LSB | ±2.25 LSB | ±2.25 LSB | ±2.25 LSB | ±1.5 LSB |
| Dynamic Range | 99.7 dB | 99.7 dB | 99.7 dB | 99.7 dB | 93.5 dB |
| SNR (Typical) | 99 dB | 99 dB | 99 dB | 99 dB | 91.5 dB |
Key Differentiators
- Higher sampling rate than AD7982 (vs AD7982BCPZ)
- Lower power than AD7980 at same speed (vs AD7980BCPZ-RL7)
- Pin-compatible with AD7982 (vs AD7982BCPZ)
Design Notes
The AD7984BCPZ requires a clean 2.5V analog supply (VDD) and a separate digital interface supply (VIO) that can range from 1.8V to 5V. Use low-ESR ceramic capacitors (e.g., 10uF and 0.1uF) placed close to the VDD and VIO pins to decouple high-frequency noise. The reference voltage (REF) should be driven by a low-impedance source, such as a precision reference buffer, to ensure accurate conversions.
For optimal performance, place the AD7984BCPZ on a solid ground plane and minimize trace lengths for the analog input and reference. Use a star-ground topology to separate analog and digital grounds, connecting them at a single point. Keep the SPI lines (SCK, SDO, SDI, CNV) short and avoid routing them near high-speed digital signals to prevent crosstalk. Consider adding a series resistor (e.g., 33 ohm) on the SCK line to reduce ringing.
A common pitfall is driving the analog input with a high-impedance source, which can cause sampling errors due to the ADC's input capacitance. Use a low-impedance driver, such as an op-amp buffer, to ensure the input settles within the acquisition time. Also, ensure the reference voltage is stable and noise-free; any noise on REF directly affects the conversion accuracy. Finally, avoid exceeding the absolute maximum ratings on VDD and VIO to prevent damage.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
