AD7687BCPZ - 16-Bit 250kSPS PulSAR ADC | Analog Devices
MPN: AD7687BCPZ β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $16.11 | $16.11 |
| 10 | $14.5 | $145.00 |
| 100 | $12.89 | $1,289.00 |
| 500 | $11.28 | $5,640.00 |
| 1,000 | $9.67 | $9,670.00 |
Drop-in alternatives for AD7687BCPZ 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:
AD7687BCPZ-R2
β Drop-Inπ Reference alternative (not in catalog)
AD7687BCPZRL7
β Drop-Inπ Reference alternative (not in catalog)
AD7687BCPZ Maximum Ratings & Electrical Characteristics
| Resolution | 16 bit |
| Sampling Rate | 250 kSPS |
| Number of Input Channels | 1 |
| Input Type | Differential |
| Interface | SPI |
| Architecture | SAR |
| Supply Voltage | 2.3 V to 5.5 V |
| Logic Supply Voltage (VIO) | 1.8 V to 5.5 V |
| INL (Integral Nonlinearity) | Β±1.5 LSB |
| SNR (Signal-to-Noise Ratio) | 92 dB |
| THD (Total Harmonic Distortion) | -108 dB |
| Power Consumption | 4.5 mW at 250 kSPS |
| Operating Temperature Range | -40Β°C to +85Β°C |
| Package | 10-LFCSP-WD (3x3 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
AD7687BCPZ Pin Configuration
| Pin 1 | IN+ β Positive differential analog input |
| Pin 2 | IN- β Negative differential analog input |
| Pin 3 | GND β Ground |
| Pin 4 | VREF β Reference voltage input |
| Pin 5 | VDD β Power supply |
| Pin 6 | VIO β Digital interface supply |
| Pin 7 | SDI β Serial data input (also BUSY indicator) |
| Pin 8 | SDO β Serial data output |
| Pin 9 | SCK β Serial clock input |
| Pin 10 | CNV β Convert input |
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
AD7687BCPZ is suitable for 6 applications: Portable Instrumentation, Medical Devices, Industrial Process Control, Data Acquisition Systems, Battery-Powered Devices, Audio and Vibration Analysis.
Portable Instrumentation
The AD7687BCPZ is ideal for portable instruments due to its low power consumption of 4.5 mW at 250 kSPS and small 3x3 mm LFCSP package. Its 16-bit resolution and 92 dB SNR ensure accurate measurements in battery-powered devices like handheld multimeters and data loggers. The SPI interface simplifies connection to low-power microcontrollers, and the wide supply range (2.3 V to 5.5 V) accommodates various battery chemistries. The differential input rejects common-mode noise, improving measurement accuracy in field environments.
Recommended
Medical Devices
In medical devices such as patient monitors and diagnostic equipment, the AD7687BCPZ provides high precision with 16-bit resolution and 1.5 LSB INL. Its low power consumption is critical for battery-operated devices, and the small package allows for compact designs. The differential input is suitable for biopotential measurements like ECG and EEG, where common-mode rejection is essential. The SPI interface enables easy integration with medical-grade microcontrollers, and the industrial temperature range (-40Β°C to +85Β°C) ensures reliability in clinical environments.
Recommended
Industrial Process Control
The AD7687BCPZ is well-suited for industrial process control systems that require accurate analog-to-digital conversion of sensor signals. Its 250 kSPS sampling rate and 16-bit resolution enable real-time monitoring of temperature, pressure, and flow. The differential input rejects noise from industrial environments, and the wide supply voltage range allows operation from 24 V industrial supplies with appropriate regulation. The SPI interface with daisy-chain capability simplifies wiring in multi-channel systems, reducing cost and complexity. The device's robust performance over -40Β°C to +85Β°C ensures reliable operation in harsh factory conditions.
Recommended
Data Acquisition Systems
The AD7687BCPZ is a key component in data acquisition systems (DAQ) for test and measurement applications. Its 16-bit resolution and 250 kSPS sampling rate provide a good balance between speed and accuracy for capturing dynamic signals. The low power consumption makes it suitable for USB-powered or battery-operated DAQ modules. The SPI interface allows easy connection to FPGAs or microcontrollers, and the daisy-chain feature enables expansion to multiple channels. The device's excellent SNR (92 dB) and THD (-108 dB) ensure high-fidelity signal capture for applications like vibration analysis and audio testing.
Recommended
Battery-Powered Devices
The AD7687BCPZ is optimized for battery-powered devices due to its low power consumption and wide supply voltage range. It operates from 2.3 V to 5.5 V, allowing direct connection to lithium-ion or alkaline batteries. The power consumption scales linearly with throughput, so reducing the sampling rate extends battery life. The small 3x3 mm package is ideal for compact wearable devices and IoT sensors. The SPI interface with 1.8 V logic capability enables direct connection to low-power microcontrollers, reducing overall system power. The device's high accuracy ensures reliable data collection in remote monitoring applications.
Recommended
Audio and Vibration Analysis
The AD7687BCPZ's high SNR (92 dB) and low THD (-108 dB) make it suitable for audio and vibration analysis applications. Its 16-bit resolution captures fine details in acoustic signals, while the 250 kSPS sampling rate allows analysis of frequencies up to 125 kHz. The differential input reduces common-mode interference, which is beneficial in noisy environments. The low power consumption enables portable audio analyzers and vibration monitors. The SPI interface allows easy integration with digital signal processors (DSPs) for real-time analysis. The device's small package is ideal for embedded systems in industrial and automotive applications.
Recommended
Recommended Products Summary
Engineering reference data for AD7687BCPZ β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7687BCPZ-R2 | AD7687BCPZRL7 | AD7682BCPZ | AD7690BCPZ |
|---|---|---|---|---|---|
| Package | 10-LFCSP-WD (3x3 mm) | 10-LFCSP-WD (3x3 mm) - same | 10-LFCSP-WD (3x3 mm) - same | 20-LFCSP-WD (4x4 mm) - different | 10-MSOP - different |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Sampling Rate | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 400 kSPS |
| Number of Channels | 1 | 1 | 1 | 4 | 1 |
| Input Type | Differential | Differential | Differential | Differential | Differential |
| Supply Voltage | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V |
| Power Consumption | 4.5 mW at 250 kSPS | 4.5 mW at 250 kSPS | 4.5 mW at 250 kSPS | 4.5 mW at 250 kSPS | 7.5 mW at 400 kSPS |
Key Differentiators
- Low power consumption (vs AD7690BCPZ)
- Small package size (vs AD7682BCPZ)
- Single-channel simplicity (vs AD7682BCPZ)
Design Notes
The AD7687BCPZ operates from a 2.3 V to 5.5 V supply. For optimal performance, use a low-noise LDO regulator to supply VDD and VIO. Decouple each supply pin with a 0.1 Β΅F ceramic capacitor placed as close to the pin as possible, and a 10 Β΅F bulk capacitor for lower frequencies. The VIO supply should match the host interface logic level to avoid signal integrity issues.
For best performance, use a solid ground plane and separate analog and digital ground areas, connecting them at a single point near the ADC. Place the reference decoupling capacitor (0.1 Β΅F) close to the VREF pin. Keep analog input traces short and shielded to minimize noise pickup. The exposed pad on the LFCSP package should be soldered to the ground plane for thermal and electrical performance.
Ensure the reference voltage (VREF) is stable and within the specified range (0.5 V to VDD). An unstable reference will directly degrade conversion accuracy. Also, avoid driving the analog inputs beyond the supply rails, as this can cause latch-up or damage. Use a series resistor (e.g., 100 Ξ©) to limit input current if overvoltage is possible. The CNV pin must be low during conversion to avoid glitches.
Compliance Information
RoHS compliance is indicated by the 'Z' in the part number (AD7687BCPZ). Other compliance details not specified in the provided data.
