AD7690BRMZ-RL7 - 18-Bit 400kSPS PulSAR ADC | Analog Devices
MPN: AD7690BRMZ-RL7 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 AD7690BRMZ-RL7 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:
AD7690BRMZ
β Drop-Inπ Reference alternative (not in catalog)
AD7691BRMZ
β Drop-Inπ Reference alternative (not in catalog)
AD7984BRMZ-RL7
β Drop-Inπ Reference alternative (not in catalog)
AD7690BCPZ
β Drop-Inπ Reference alternative (not in catalog)
MAX11166
β Drop-Inπ Reference alternative (not in catalog)
LTC1867
β Drop-Inπ Reference alternative (not in catalog)
AD7690BRMZ-RL7 Maximum Ratings & Electrical Characteristics
| Resolution | 18 bits |
| Number of Inputs | 1 |
| Input Type | Differential |
| Sampling Rate | 400 kSPS |
| Architecture | SAR |
| INL (Max) | Β±1.5 LSB (Β±6 ppm of FSR) |
| Dynamic Range | 102 dB typical @ 400 kSPS |
| Supply Voltage | 2.3V to 5.5V |
| Reference Voltage | External, up to VDD |
| Interface | SPI-compatible, daisy-chain capable |
| Package | 10-MSOP |
| Operating Temperature | -40Β°C to +125Β°C |
| Power Dissipation | [DATA_NEEDED: Power dissipation] |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount |
AD7690BRMZ-RL7 Pin Configuration
| Pin 1 | IN+ β Positive differential input |
| Pin 2 | IN- β Negative differential input |
| Pin 3 | GND β Ground |
| Pin 4 | VDD β Power supply |
| Pin 5 | REF β Reference voltage input |
| Pin 6 | SDI β Serial data input (for daisy-chain) |
| Pin 7 | SDO β Serial data output |
| Pin 8 | SCK β Serial clock input |
| Pin 9 | CNV β Convert input (start conversion) |
| Pin 10 | BUSY β Busy indicator output |
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
AD7690BRMZ-RL7 is suitable for 6 applications: Precision Data Acquisition Systems, Medical Instrumentation, Industrial Process Control, Battery-Powered Portable Devices, Vibration Analysis, Audio Test and Measurement.
Precision Data Acquisition Systems
The AD7690BRMZ-RL7's 18-bit resolution and 400 kSPS sampling rate make it ideal for high-precision data acquisition systems. Its differential input reduces common-mode noise, ensuring accurate measurement of low-level signals. The SPI interface allows easy integration with microcontrollers and DSPs, and the daisy-chain capability simplifies multi-channel systems. With a dynamic range of 102 dB, it can capture both small and large signals without saturation, making it suitable for applications like vibration analysis, weigh scales, and industrial process control. The low power consumption, scaling with throughput, is beneficial for portable and battery-powered data loggers.
Recommended
Medical Instrumentation
In medical devices such as patient monitors and diagnostic equipment, the AD7690BRMZ-RL7 provides the high resolution and accuracy needed for precise signal measurement. Its 18-bit resolution ensures fine detail in biological signals like ECG and EEG, while the low power consumption extends battery life in portable devices. The differential input helps reject interference from other medical equipment, and the small MSOP package fits compact designs. The industrial temperature range ensures reliable operation in clinical environments. The SPI interface simplifies connection to medical-grade microcontrollers, and the daisy-chain feature allows multiple channels for multi-parameter monitoring.
Recommended
Industrial Process Control
The AD7690BRMZ-RL7 is well-suited for industrial process control systems that require high-resolution analog-to-digital conversion. Its 18-bit resolution and low INL (Β±1.5 LSB) ensure accurate monitoring of process variables such as temperature, pressure, and flow. The differential input rejects common-mode noise from industrial environments, and the wide supply voltage range (2.3V to 5.5V) accommodates various power rails. The SPI interface with daisy-chain capability enables efficient multi-channel data acquisition in distributed control systems. The industrial temperature range (-40Β°C to +125Β°C) guarantees reliable operation in harsh factory conditions.
Recommended
Battery-Powered Portable Devices
For portable instruments and battery-powered devices, the AD7690BRMZ-RL7 offers an excellent balance of performance and power efficiency. Its power consumption scales linearly with throughput, allowing designers to optimize for battery life by reducing the sampling rate when full speed is not required. The 18-bit resolution provides high accuracy for measurements in field instruments, while the small MSOP package saves board space. The SPI interface is compatible with low-power microcontrollers, and the differential input helps reject noise from the device's own digital circuitry. The wide supply voltage range supports direct battery operation without additional regulation.
Recommended
Vibration Analysis
The AD7690BRMZ-RL7's high dynamic range (102 dB) and 400 kSPS sampling rate make it ideal for vibration analysis applications. It can capture both high-frequency vibrations and low-level signals with high fidelity, enabling accurate condition monitoring of rotating machinery. The differential input reduces noise pickup from the sensor and cabling, while the 18-bit resolution provides fine amplitude resolution for detecting subtle changes in vibration patterns. The SPI interface allows direct connection to DSPs for real-time processing, and the daisy-chain feature supports multi-axis vibration monitoring. The industrial temperature range ensures reliable operation in machine rooms and outdoor environments.
Recommended
Audio Test and Measurement
In audio test equipment, the AD7690BRMZ-RL7 provides the high resolution and low distortion needed for accurate audio analysis. Its 18-bit resolution and 102 dB dynamic range allow measurement of audio signals with high precision, capturing both quiet and loud passages without distortion. The differential input reduces common-mode noise, and the SPI interface enables easy integration with audio test systems. The 400 kSPS sampling rate is sufficient for audio bandwidths, and the low power consumption is beneficial for portable audio analyzers. The small MSOP package fits compact test instruments, and the industrial temperature range ensures stable performance in lab environments.
Recommended
Recommended Products Summary
Engineering reference data for AD7690BRMZ-RL7 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7690BRMZ | AD7691BRMZ | AD7984BRMZ-RL7 | AD7690BCPZ | MAX11166 | LTC1867 |
|---|---|---|---|---|---|---|---|
| Package | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Maxim Integrated | Analog Devices |
| Resolution | 18 bits | 18 bits | 18 bits | 18 bits | 18 bits | 16 bits | 16 bits |
| Sampling Rate | 400 kSPS | 400 kSPS | 400 kSPS | 1.33 MSPS | 400 kSPS | 500 kSPS | 200 kSPS |
| Input Type | Differential | Differential | 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 LSB | Β±2 LSB |
| Supply Voltage | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V | 2.35V to 3.6V | 2.7V to 5.5V |
| Interface | SPI | SPI | SPI | SPI | SPI | SPI | SPI |
Key Differentiators
- 18-bit resolution with no missing codes (vs MAX11166)
- Higher sampling rate than LTC1867 (vs LTC1867)
- Lower INL than LTC1867 (vs LTC1867)
Design Notes
The AD7690BRMZ-RL7 operates from a single 2.3V to 5.5V supply. Use a low-noise LDO to supply VDD and place a 10uF and 0.1uF decoupling capacitor close to the VDD pin. The reference voltage (REF) should be driven by a low-noise reference, such as the ADR4550, and decoupled with a 10uF capacitor to ensure stable conversion results.
For optimal performance, keep the analog input traces short and shielded from digital signals. Use a solid ground plane and separate analog and digital ground areas, connecting them at a single point. Place the ADC close to the signal source to minimize noise pickup. The SPI lines (SCK, SDO, SDI, CNV) should be routed away from analog inputs to avoid crosstalk.
Ensure the reference voltage is stable and within the specified range (up to VDD). An unstable reference will directly degrade the ADC's accuracy. Also, avoid driving the analog inputs beyond the supply rails, as this can cause latch-up or damage. Use series resistors to limit input current if overvoltage is possible.
Compliance Information
RoHS compliance confirmed from distributor data. Other compliance details not specified in provided data.
