AD7690BCPZRL7 - 18-Bit 400kSPS PulSAR ADC | Analog Devices
MPN: AD7690BCPZRL7 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $27.5 | $27.50 |
| 10 | $25.3 | $253.00 |
| 100 | $22 | $2,200.00 |
| 500 | $19.8 | $9,900.00 |
| 1,000 | $17.6 | $17,600.00 |
Drop-in alternatives for AD7690BCPZRL7 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:
AD7690BCPZ
β Drop-Inπ Reference alternative (not in catalog)
AD7691BCPZRL7
β Drop-Inπ Reference alternative (not in catalog)
AD7982BCPZRL7
β Drop-Inπ Reference alternative (not in catalog)
AD7687BCPZRL7
β Drop-Inπ Reference alternative (not in catalog)
AD7688BCPZRL7
β Drop-Inπ Reference alternative (not in catalog)
AD7693BCPZRL7
β Drop-Inπ Reference alternative (not in catalog)
AD7690BCPZRL7 Maximum Ratings & Electrical Characteristics
| Resolution | 18 bits |
| Sampling Rate | 400 kSPS |
| Number of Inputs | 1 |
| Input Type | Differential |
| Data Interface | SPI, DSP, MICROWIRE, QSPI |
| Architecture | SAR |
| INL (Integral Nonlinearity) | Β±0.75 LSB typ, Β±1.5 LSB max (Β±6 ppm of FSR) |
| Supply Voltage (VDD) | 4.75 V to 5.25 V |
| Logic Supply (VIO) | 1.8 V to 5 V |
| Package | 10-LFCSP-WD (3x3 mm) |
| Operating Temperature | -40Β°C to +85Β°C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Number of Bits | 18 |
| Reference Type | External |
AD7690BCPZRL7 Pin Configuration
| Pin 1 | IN+ β Positive analog input |
| Pin 2 | IN- β Negative analog input |
| Pin 3 | GND β Ground |
| Pin 4 | VREF β Reference input |
| Pin 5 | VDD β Power supply |
| Pin 6 | VIO β Logic supply |
| Pin 7 | SDI β Serial data input (daisy-chain) |
| Pin 8 | SDO β Serial data output |
| Pin 9 | SCK β Serial clock |
| 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
AD7690BCPZRL7 is suitable for 6 applications: Precision Data Acquisition, Medical Instrumentation, Industrial Process Control, Vibration Analysis, Battery-Powered Instruments, Audio Test Equipment.
Precision Data Acquisition
The AD7690BCPZRL7's 18-bit resolution and 400 kSPS sampling rate make it ideal for high-accuracy data acquisition systems. Its differential input rejects common-mode noise, and the SPI interface simplifies connection to microcontrollers. In a typical DAQ system, the ADC converts sensor signals with minimal distortion, ensuring precise measurement of physical phenomena. The low power consumption scales with throughput, enabling efficient operation in portable instruments.
Recommended
Medical Instrumentation
In medical devices such as patient monitors and diagnostic equipment, the AD7690BCPZRL7 provides the high resolution and low noise required for accurate biosignal acquisition. Its small LFCSP package saves space in compact devices, and the SPI interface allows easy integration with medical-grade microcontrollers. The device's linearity (Β±1.5 LSB max) ensures reliable measurements, critical for patient safety.
Recommended
Industrial Process Control
The AD7690BCPZRL7 excels in industrial process control, where precise monitoring of temperature, pressure, and flow is essential. Its 18-bit resolution provides fine granularity, and the differential input rejects interference from motors and other industrial equipment. The device operates from a 5V supply, common in industrial systems, and its SPI interface supports daisy-chaining for multi-channel control loops.
Recommended
Vibration Analysis
For vibration monitoring in machinery and structural health, the AD7690BCPZRL7's 400 kSPS sampling rate captures high-frequency vibrations with 18-bit resolution. The differential input connects directly to accelerometers, and the low power consumption allows battery-powered wireless sensors. The device's dynamic range and linearity ensure accurate spectral analysis, enabling early detection of mechanical faults.
Recommended
Battery-Powered Instruments
The AD7690BCPZRL7's power consumption scales linearly with throughput, making it ideal for battery-powered instruments like handheld multimeters and portable data loggers. At lower sampling rates, power drops significantly, extending battery life. The 3x3 mm LFCSP package minimizes board space, and the SPI interface supports low-power microcontrollers. The device's 18-bit resolution ensures accurate readings in field applications.
Recommended
Audio Test Equipment
In audio test and measurement, the AD7690BCPZRL7 provides high-resolution conversion for analyzing audio signals. Its 18-bit resolution and low distortion enable accurate measurement of THD and frequency response. The differential input reduces noise, and the SPI interface allows integration with DSPs for real-time analysis. The device's linearity ensures reliable test results for audio equipment calibration.
Recommended
Recommended Products Summary
Engineering reference data for AD7690BCPZRL7 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7690BCPZ | AD7691BCPZRL7 | AD7982BCPZRL7 | AD7687BCPZRL7 | AD7688BCPZRL7 | AD7693BCPZRL7 |
|---|---|---|---|---|---|---|---|
| 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) | 10-LFCSP-WD (3x3 mm) | 10-LFCSP-WD (3x3 mm) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 18 bits | 18 bits | 18 bits | 18 bits | 16 bits | 16 bits | 16 bits |
| Sampling Rate | 400 kSPS | 400 kSPS | 400 kSPS | 1 MSPS | 250 kSPS | 500 kSPS | 500 kSPS |
| Input Type | Differential | Differential | Pseudo-differential | Differential | Differential | Differential | Differential |
| INL (max) | Β±1.5 LSB | Β±1.5 LSB | Β±1.5 LSB | Β±1.5 LSB | Β±1.5 LSB | Β±1.5 LSB | Β±1.5 LSB |
| Supply Voltage | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V | 2.3V to 5.25V | 2.3V to 5.25V | 2.3V to 5.25V | 2.3V to 5.25V |
| Power Consumption (typ) | 12.5 mW @ 400 kSPS | 12.5 mW @ 400 kSPS | 12.5 mW @ 400 kSPS | 7.5 mW @ 1 MSPS | 3.5 mW @ 250 kSPS | 7.5 mW @ 500 kSPS | 7.5 mW @ 500 kSPS |
Key Differentiators
- 18-bit resolution with no missing codes (vs AD7687BCPZRL7 (16-bit))
- 400 kSPS sampling rate (vs AD7687BCPZRL7 (250 kSPS))
- Differential input (vs AD7691BCPZRL7 (pseudo-differential))
Design Notes
The AD7690BCPZRL7 requires a clean 5V analog supply (VDD) and a separate logic supply (VIO) for the digital interface. Decouple VDD with a 10uF and 0.1uF capacitor close to the pin, and VIO with a 0.1uF capacitor. The reference input (VREF) should be driven by a low-impedance source, such as an op-amp buffer, to maintain accuracy.
For optimal performance, place the ADC close to the signal source and use a solid ground plane. Keep analog and digital grounds separate and connect them at a single point. Minimize trace length on the analog inputs (IN+ and IN-) to reduce parasitic capacitance and noise pickup. Use a ground guard ring around the analog input traces.
Avoid driving the analog inputs beyond the supply rails (GND to VDD) to prevent latch-up. Ensure the reference voltage is stable and noise-free; a noisy reference directly degrades ADC accuracy. When daisy-chaining, ensure proper timing of the CNV and SCK signals to avoid data corruption. Always consult the datasheet's layout guidelines.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified; for automotive, consider AD7690BCPZRL7 is not specified.
