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:
AD7691BRMZ
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AD7690BRMZ
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View Datasheet βAD7984BRMZ-RL7
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AD7980BRMZ
β Drop-Inβ In Stock
$16.8636 / Unit
View Datasheet βMAX11166
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AD7690BRMZ-RL7 Maximum Ratings & Electrical Characteristics
| Resolution | 18 bits |
| Sampling Rate | 400 kSPS |
| Input Type | Differential |
| Number of Inputs | 1 |
| 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 supply voltage |
| Interface | SPI-compatible, daisy-chain capable |
| Package | 10-lead MSOP |
| Operating Temperature | -40Β°C to +125Β°C |
| Power Consumption | Scales linearly with throughput |
| No Missing Codes | Yes |
| Busy Indicator | Yes |
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 (daisy-chain) |
| Pin 7 | SDO β Serial data output |
| Pin 8 | SCK β Serial clock input |
| Pin 9 | CNV β Conversion start input |
| 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, Industrial Process Control, Medical Instrumentation, Battery-Powered Portable Devices, Vibration Analysis, Weigh Scales.
Precision Data Acquisition Systems
The AD7690BRMZ-RL7'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, ensuring clean signal capture from sensors. The SPI interface simplifies connection to microcontrollers, and the low power consumption allows continuous operation in portable systems. With a dynamic range of 102 dB, it can resolve small signals in noisy environments, making it suitable for industrial and laboratory equipment.
Recommended
Industrial Process Control
In industrial process control, the AD7690BRMZ-RL7 provides precise measurement of analog signals from sensors like pressure, temperature, and flow. Its wide operating temperature range (-40Β°C to +125Β°C) ensures reliability in harsh environments. The 18-bit resolution and low INL (Β±1.5 LSB) guarantee accurate control loops. The SPI interface allows easy integration with PLCs and microcontrollers, and the daisy-chain capability enables multi-channel monitoring without additional GPIO pins.
Recommended
Medical Instrumentation
The AD7690BRMZ-RL7 is well-suited for medical devices such as patient monitors and diagnostic equipment. Its high resolution (18-bit) and low power consumption are critical for battery-operated portable monitors. The differential input reduces interference from electrical noise, ensuring accurate readings of bio-signals. The small MSOP package saves board space in compact devices. The SPI interface enables seamless data transfer to processing units, and the wide temperature range supports various clinical environments.
Recommended
Battery-Powered Portable Devices
For battery-powered devices, the AD7690BRMZ-RL7 offers power scaling with throughput, allowing significant power savings at lower sampling rates. Its 2.3V to 5.5V supply range is compatible with common battery voltages. The 18-bit resolution provides high accuracy for applications like portable gas detectors and handheld multimeters. The compact MSOP package and SPI interface make it easy to integrate into space-constrained designs, and the low power consumption extends battery life.
Recommended
Vibration Analysis
The AD7690BRMZ-RL7's high dynamic range (102 dB) and 400 kSPS sampling rate make it ideal for vibration analysis. It can capture high-frequency vibration signals with excellent resolution, enabling early detection of mechanical faults. The differential input reduces noise from the sensor interface, and the SPI interface allows high-speed data transfer to a DSP or FPGA for real-time processing. The wide temperature range ensures reliable operation in industrial environments.
Recommended
Weigh Scales
In weigh scale applications, the AD7690BRMZ-RL7 provides the high resolution and low noise required for accurate weight measurement. Its 18-bit resolution and low INL ensure precise readings, while the differential input interfaces directly with bridge sensors. The SPI interface simplifies connection to microcontrollers, and the low power consumption is beneficial for battery-operated scales. The compact MSOP package fits well in portable designs.
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 | AD7691BRMZ | AD7984BRMZ-RL7 | AD7980BRMZ |
|---|---|---|---|---|
| Package | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 18 bits | 18 bits | 18 bits | 16 bits |
| Sampling Rate | 400 kSPS | 1 MSPS | 1.33 MSPS | 1 MSPS |
| INL (Max) | Β±1.5 LSB | Β±1.5 LSB | Β±1.5 LSB | Β±1.5 LSB |
| Supply Voltage | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V |
| Interface | SPI | SPI | SPI | SPI |
| Price (1ku) | $27.50 | $[DATA_NEEDED] | $[DATA_NEEDED] | $[DATA_NEEDED] |
Key Differentiators
- Higher resolution than AD7980BRMZ (vs AD7980BRMZ)
- Lower sampling rate than AD7984BRMZ-RL7 (vs AD7984BRMZ-RL7)
- Pin-compatible with AD7691BRMZ (vs AD7691BRMZ)
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 10Β΅F ceramic capacitor close to the VDD pin. The reference voltage (REF) should be driven by a low-impedance source, such as a precision reference like the ADR4525, with a 10Β΅F decoupling capacitor to ensure stable conversion accuracy.
For optimal performance, keep the analog input traces short and shielded from digital noise. Use a solid ground plane and separate analog and digital ground areas, connecting them at a single point. Place decoupling capacitors (0.1Β΅F and 10Β΅F) close to the VDD and REF pins. The SPI lines (SCK, SDO, SDI, CNV) should be kept short and properly terminated to avoid signal integrity issues at 400 kSPS.
Ensure the reference voltage is stable and well-decoupled, as it directly affects conversion accuracy. Avoid driving the analog inputs beyond the REF range to prevent damage. The CNV pin must be pulsed to start a conversion; ensure it is not left floating. Also, verify that the SPI timing meets the datasheet requirements, especially at high throughput rates.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
