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Analog Devices Inc. AD7150BRMZ
- Part No.:
- AD7150BRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor and Detector Interfaces
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7150BRMZ.pdf
- Description:
- IC CAP CONV 2CH ULT LP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:126
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Product details
Overview
AD7150BRMZ from Analog Devices is an ultralow-power, 2-channel capacitance-to-digital converter (CDC) designed for capacitive proximity sensing in battery-powered and space-constrained systems. It delivers 10 ms response time, 1 fF sensitivity, adaptive environmental compensation, and operates from 2.7 V to 3.6 V at 100 µA typical supply current. It interfaces directly with floating capacitive sensors in contactless switching and position detection applications.
For engineers reviewing the AD7150BRMZ datasheet, AD7150BRMZ pinout, AD7150BRMZ application, or AD7150BRMZ equivalent, key selection criteria include its dual-channel CDC architecture, I²C-compatible serial interface, standalone operation with fixed thresholds, 10-lead MSOP package, and integrated CAPDAC for parasitic capacitance compensation up to 10 pF.
Technical Context
The AD7150BRMZ integrates a second-order sigma-delta charge-balancing modulator and third-order digital filter per channel, enabling direct connection to floating capacitive sensors with no external excitation circuitry. Its excitation source operates at 30.9–32.8 kHz with slew-rate limiting for improved EMC performance.
It supports two independent operational modes: standalone (fixed settings, dual logic outputs OUT1/OUT2) and microcontroller-controlled (via I²C), with programmable threshold modes (adaptive or fixed), hysteresis, timeout, and auto-adjusting CAPDAC. The adaptive threshold engine uses exponential averaging (time constant selectable from 2–65,536 conversions) to reject slow environmental drift while detecting fast proximity events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7 V to 3.6 V - compatible with standard Li-ion and 3.3 V system rails; internal power monitor disables adaptive logic below 2.45 V. |
| Supply Current | 100 µA typical - enables multi-year battery life in always-on proximity sensors; drops to 1–5 µA in power-down mode. |
| Capacitance Range | 0 pF to 13 pF total sensor input - supported by 4 pF nominal conversion range plus 10 pF CAPDAC offset compensation. |
| Resolution | 1.0–2.0 fF - enables sub-micron displacement detection in touchless UIs and precision level sensing. |
| Response Time | 10 ms (5 ms per channel) - suitable for real-time human interaction feedback without perceptible latency. |
| Interface | I²C-compatible 2-wire serial - supports standard 400 kHz bus speed; SDA open-drain, SCL input with pull-up required. |
| Operating Temp | −40°C to +85°C - qualified for industrial and automotive cabin environments without derating. |
Pinout & Package
AD7150BRMZ is housed in a 10-lead MSOP (Mini Small Outline Package) with 0.5 mm lead pitch, optimized for compact PCB layouts and automated assembly. Thermal resistance θJA = 206°C/W supports operation in sealed enclosures without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary return path for all analog and digital currents; must be low-impedance connection to system ground plane. |
| VDD (Pin 2) | Power supply input | Supplies core CDC, logic, and excitation circuits; requires local 0.1 µF X7R ceramic decoupling to GND. |
| CIN2 (Pin 3) | Channel 2 capacitive input | Connects to one plate of floating sensor capacitor; high-impedance node sensitive to PCB parasitics. |
| CIN1 (Pin 4) | Channel 1 capacitive input | Independent high-Z input for first sensor; unused pins may be left open or tied to GND. |
| EXC2 (Pin 5) | Channel 2 excitation output | AC voltage source (±VDD/2 @ 32 kHz) driving second sensor plate; must remain open if unused. |
| EXC1 (Pin 6) | Channel 1 excitation output | Matches EXC2 in amplitude/frequency; forms differential excitation pair with CIN1/CIN2. |
| OUT1 (Pin 7) | Channel 1 proximity flag | Active-high CMOS output indicating CIN1 threshold crossing; drives LEDs or MCU interrupt lines directly. |
| OUT2 (Pin 8) | Channel 2 proximity flag | Independent logic output for second channel; no internal pull-up; requires external pull-up for open-collector use. |
| SCL (Pin 9) | I²C clock input | Asynchronous master clock; requires external pull-up resistor (typically 4.7 kΩ) to VDD. |
| SDA (Pin 10) | I²C bidirectional data | Open-drain interface line; shares pull-up with SCL; supports read/write register access and status polling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent CDC channels | Enables simultaneous monitoring of two separate proximity zones (e.g., front/rear panel or left/right hand detection) without multiplexing delay or crosstalk. |
| Adaptive threshold algorithm | Automatically tracks slow environmental capacitance drift (humidity, temperature, dielectric aging) while preserving fast response to user proximity events. |
| Programmable CAPDAC (10–12.5 pF full scale) | Compensates for fixed parasitic capacitance up to 10 pF, extending effective sensor range and improving signal-to-noise ratio in noisy layouts. |
| Standalone + MCU-configurable modes | Reduces BOM count in simple applications (no host processor needed); adds flexibility for dynamic recalibration or multi-sensitivity profiles when connected to a controller. |
| EMC-optimized excitation | Slew-rate limited 32 kHz excitation minimizes harmonic emissions, simplifying CE/FCC compliance for consumer electronics and medical devices. |
Applications
| Smartphone Proximity Sensing | Industrial Level Detection |
|---|---|
|
Use Scenario: Detecting hand presence near display during call to disable touchscreen and backlight. IC Role / Device Role / Timing Role: Capacitance-to-digital converter measuring minute capacitance shift caused by hand approaching glass surface. Use Value: 10 ms response ensures immediate screen blanking; 1 fF resolution enables reliable detection through 3 mm cover glass; ultralow 100 µA current extends standby battery life. |
Use Scenario: Monitoring liquid level in non-metallic tanks using external capacitive electrodes. IC Role / Device Role / Timing Role: Dual-channel CDC converting electrode capacitance change into digital level indication, rejecting tank-wall humidity effects. Use Value: Adaptive threshold compensates for condensation-induced baseline drift; CAPDAC nulls mounting fixture parasitics; −40°C to +85°C rating supports outdoor deployment. |
| Touchless Appliance Controls | Medical Patient Position Monitoring |
|
Use Scenario: Replacing mechanical buttons on oven/microwave control panels with gesture-sensitive overlays. IC Role / Device Role / Timing Role: Proximity detector interpreting finger hover as button press, immune to grease, moisture, or cleaning agents. Use Value: Standalone mode eliminates need for MCU firmware; I²C interface allows sensitivity tuning post-production; EMC-hardened design meets IEC 61000-4-3 immunity requirements. |
Use Scenario: Detecting patient movement or bed exit in hospital beds using embedded textile-based capacitive sensors. IC Role / Device Role / Timing Role: Low-power CDC continuously sampling sensor capacitance to trigger alarms upon sustained position change. Use Value: 1–5 µA power-down current enables multi-week operation on coin-cell batteries; 2.7 V minimum supply supports aging battery operation; medical-grade ESD protection (4 kV HBM). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar capacitance-to-digital conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7151BRMZ | Single-channel version with lower 50 µA typical supply current; identical architecture, registers, and pinout except missing CIN2/EXC2/OUT2. | Best suited for cost- and power-sensitive single-zone sensing where dual channels are unnecessary. | Select AD7151BRMZ when only one proximity zone is required and board area or quiescent current is critical. |
| TI FDC1004DSCR | 4-channel CDC with 16-bit resolution, 100 ksps sampling, and integrated oscillator; requires external MCU for all configuration and processing. | Targets higher-precision applications like material thickness measurement or multi-electrode touchscreens requiring raw data streaming. | Choose FDC1004DSCR when >2 channels, higher resolution, or faster update rates are needed-accepting increased software overhead and power. |
Compared with AD7150BRMZ, AD7151BRMZ reduces channel count and current but retains identical feature set per channel, while FDC1004DSCR trades integrated intelligence and low power for greater channel density and raw data fidelity-making AD7150BRMZ optimal for balanced dual-zone proximity sensing with minimal system integration effort.
Availability
AD7150BRMZ is available at Aetrix Electronics and suitable for industrial level detection, touchless appliance controls, and medical patient position monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7150BRMZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The AD7150BRMZ belongs to Analog Devices' precision capacitance sensing product line, engineered specifically for robust, low-power proximity detection in consumer, industrial, and medical systems where reliability under environmental stress is critical.
FAQ
What is the maximum sensor capacitance the AD7150BRMZ can measure?
The AD7150BRMZ supports a total sensor capacitance of up to 13 pF: 4 pF is the base conversion range, and an additional 10 pF is compensated via the integrated 6-bit CAPDAC (10–12.5 pF full scale). This allows accurate measurement of sensors with significant parasitic ground capacitance. The AD7150BRMZ achieves this without external components, maintaining 1 fF resolution across the extended range.
Does the AD7150BRMZ require an external microcontroller to operate?
No-the AD7150BRMZ operates in standalone mode using factory-default settings, generating active-high proximity flags on OUT1 and OUT2 without any host intervention. An external microcontroller is optional and only needed to reconfigure thresholds, sensitivity, averaging time, or enable advanced features like auto-CAPDAC adjustment. The AD7150BRMZ remains fully functional as a self-contained proximity detector.
How does the AD7150BRMZ handle environmental changes like humidity or temperature drift?
The AD7150BRMZ employs an integrated adaptive threshold algorithm that continuously calculates an exponential average of recent CDC conversion results. This average serves as the dynamic baseline, allowing the device to ignore slow capacitance shifts caused by humidity, temperature, or dielectric aging while still triggering instantly on rapid proximity events. The AD7150BRMZ implements this entirely on-chip with no firmware dependency.
What package type and dimensions does the AD7150BRMZ use?
The AD7150BRMZ is supplied in a 10-lead MSOP (Mini Small Outline Package) with 0.5 mm lead pitch and body dimensions of 3.0 mm × 3.0 mm × 1.0 mm. It features exposed pad thermal enhancement and is RoHS-compliant. This compact, surface-mount package supports high-density PCB layouts and is compatible with standard reflow soldering profiles, including Pb-free peak temperatures up to 260°C.
Can the AD7150BRMZ detect both increasing and decreasing capacitance trends?
Yes-the AD7150BRMZ comparators support positive-threshold, negative-threshold, and window modes in both adaptive and fixed configurations. In positive-threshold mode, OUT1/OUT2 assert on rising capacitance (e.g., object approaching); in negative-threshold mode, they assert on falling capacitance (e.g., object receding). Window mode detects when capacitance moves outside a defined band-enabling bidirectional event detection within a single AD7150BRMZ device.
AD7150BRMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Capacitance-to-Digital Converter
- Input Type:
- Voltage
- Output Type:
- Digital
- Current - Supply:
- 120 µA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
AD7150BRMZ FAQ
1.How can I place an order for AD7150BRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7150BRMZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD7150BRMZ reliable?
The price and inventory of AD7150BRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7150BRMZ is usually 5 days.
3.What payment methods are accepted for AD7150BRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7150BRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7150BRMZ?
AD7150BRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7150BRMZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD7150BRMZ?
For technical support, including AD7150BRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7150BRMZ requirements.
6.How does Aetrix verify that AD7150BRMZ is sourced from the original manufacturer or authorized distributors?
All AD7150BRMZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD7150BRMZ meets industry standards.
7.What is the process for return or replacement of AD7150BRMZ?
All AD7150BRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7150BRMZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD7150BRMZ part is unused and in its original packaging.
Return procedure for AD7150BRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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