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Analog Devices Inc. AD7686BRMZRL7
- Part No.:
- AD7686BRMZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7686BRMZRL7.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:276
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Product details
Overview
AD7686BRMZRL7 from Analog Devices is a 16-bit, 500 kSPS pseudo-differential successive approximation ADC operating from a single 5 V supply with 1.8 V–5 V logic interface. It delivers ±0.6 LSB typical INL, 92.5 dB SINAD at 20 kHz, and no pipeline delay-enabling high-precision data acquisition in battery-powered instrumentation and medical instruments.
For engineers reviewing the AD7686BRMZRL7 datasheet, AD7686BRMZRL7 pinout, AD7686BRMZRL7 application, or AD7686BRMZRL7 equivalent, this page provides verified specifications, validated MSOP-10 pin functions, real-world use cases in process control and portable diagnostics, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The AD7686BRMZRL7 uses a charge redistribution SAR architecture with on-chip track-and-hold, achieving 500 kSPS throughput without latency or pipeline delay. Its pseudo-differential input accepts 0 V to VREF (up to 5 V) with respect to IN−, and features a proprietary SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface supporting daisy-chain mode and busy indicator.
Power scaling is linear with throughput: 3.75 µW at 100 SPS, 3.75 mW at 100 kSPS, and 15–21.5 mW at full 500 kSPS. Standby current is 1 nA, and it operates across −40°C to +85°C in both 10-lead MSOP and 10-lead LFCSP packages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes-guarantees monotonicity and full code coverage for precision measurement systems. |
| Throughput | 500 kSPS maximum-supports real-time sampling of signals up to 200 kHz bandwidth (−3 dB input bandwidth = 9 MHz). |
| INL | ±0.6 LSB typical (±2 LSB max)-ensures <0.003% FSR linearity error for calibrated sensor interfaces. |
| SINAD | 92.5 dB at 20 kHz (VREF = 5 V)-corresponds to ~15.4 ENOB, suitable for high-fidelity signal capture in medical ECG front-ends. |
| Reference Range | 0.5 V to VDD (5.5 V max)-allows flexible external reference selection including 2.5 V, 4.096 V, or rail-to-rail buffered sources. |
| Digital Interface | SPI/QSPI/MICROWIRE/DSP-compatible 3- or 4-wire serial-supports daisy-chaining up to 4 ADCs on one bus with optional busy flag. |
| Supply | VDD = 4.5–5.5 V; VIO = 1.8–5.5 V-enables direct interfacing with low-voltage microcontrollers without level shifters. |
Pinout & Package
AD7686BRMZRL7 is packaged in a 10-lead MSOP (3 mm × 3 mm, 0.85 mm height), RoHS-compliant, with exposed pad connected to GND for thermal and noise performance. Pin 1 is REF; pin 5 is GND; pin 10 is VIO. The exposed pad must be soldered to PCB ground plane per Analog Devices layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Analog reference input | Accepts 0.5 V to VDD; requires local 10 µF decoupling; sets full-scale range for IN+–IN− differential input. |
| 2 - VDD | Analog power supply | 4.5–5.5 V main supply; powers internal SAR core, track-and-hold, and reference buffer. |
| 3 - IN+ | Pseudo-differential analog input (+) | Input voltage range: 0 V to VREF relative to IN−; high-impedance during conversion, low-impedance during acquisition. |
| 4 - IN− | Analog ground sense input (−) | Provides remote ground reference; rejects common-mode noise; must be tied to clean analog ground or sensor return. |
| 5 - GND | Power ground | Common return for VDD, REF, and digital supplies; connects to exposed pad for optimal thermal path. |
| 6 - CNV | Convert trigger / interface mode select | Rising edge initiates conversion; logic level at CNV rising edge selects CS or Chain mode; enables SDO in CS mode when low. |
| 7 - SDO | Serial data output | 16-bit straight-binary output synchronized to SCK falling edge; tri-state when CNV/SDI high in CS mode. |
| 8 - SCK | Serial clock input | Drives data readout; minimum period 15 ns (VIO > 4.5 V); supports up to 66.7 MHz clock rate. |
| 9 - SDI | Serial data input / mode control | Low at CNV rising edge enables daisy-chain mode; high enables CS mode; also used as data input in chain mode. |
| 10 - VIO | Digital I/O supply | 1.8–5.5 V logic interface supply; defines VIH/VIL thresholds; isolates digital noise from analog section. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Conversion result available immediately after tCONV (≤1.6 µs); eliminates timing uncertainty in closed-loop control systems. |
| Ultra-low standby current | 1 nA at 25°C-enables multi-year battery life in intermittent-sampling applications like portable gas analyzers. |
| Pseudo-differential input architecture | Rejects common-mode noise up to 70 dB at 100 kHz; allows IN− to serve as remote ground sense for isolated sensors. |
| Scalable power dissipation | 3.75 µW @ 100 SPS → 21.5 mW @ 500 kSPS-matches power budget to sampling rate without hardware changes. |
| Pin-for-pin compatibility | Direct replacement for AD7685, AD7687, and AD7688-enables design reuse and migration within PulSAR® 16-bit family. |
Applications
| Portable Medical Diagnostics | Industrial Process Monitoring |
|---|---|
Use Scenario: Battery-powered handheld ECG or blood glucose meter acquiring analog sensor outputs at ≤10 kSPS with clinical-grade accuracy. IC Role / Device Role / Timing Role: Primary SAR ADC digitizing conditioned biopotential signals; performs single-shot or burst-mode conversions triggered by MCU. Use Value: 92.5 dB SINAD and ±0.6 LSB INL ensure diagnostic confidence; 1 nA standby current extends AA battery life beyond 2 years in sleep mode. |
Use Scenario: PLC analog input module measuring temperature, pressure, and flow transmitters in factory automation. IC Role / Device Role / Timing Role: High-precision front-end ADC for 4–20 mA loop receivers and RTD bridges; synchronized to system clock via CNV. Use Value: Pseudo-differential inputs reject ground-loop noise in distributed I/O cabinets; daisy-chain capability reduces wiring complexity across 8-channel modules. |
| Test & Measurement Equipment | Energy Metering Subsystems |
Use Scenario: Portable oscilloscope or data logger capturing transient waveforms up to 200 kHz bandwidth. IC Role / Device Role / Timing Role: Core sampling ADC in dual-channel acquisition path; leverages no-latency architecture for precise time-domain analysis. Use Value: 9 MHz −3 dB input bandwidth and 2.5 ns aperture delay enable accurate rise-time measurement; 500 kSPS throughput supports 100 kSa memory depth at 100 kS/s. |
Use Scenario: Polyphase electricity meter requiring metrology-grade voltage/current sampling under IEC 62053-21 Class 0.2 compliance. IC Role / Device Role / Timing Role: Secondary ADC for auxiliary measurements (e.g., neutral current, temperature compensation) alongside primary metrology IC. Use Value: ±2 LSB max INL and −110 dB THD meet harmonic distortion limits for revenue-grade metering; 10-lead MSOP footprint fits tight PCB space constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7685BRMZ | Same 10-lead MSOP package; 250 kSPS max throughput; 91 dB SINAD; lower power (2.5 mW @ 100 kSPS). | Targeted at cost-sensitive, lower-speed applications where 500 kSPS is unnecessary-e.g., slow-scan thermocouple logging. | Select AD7685BRMZ if throughput ≤250 kSPS suffices and board space/power budget are tighter; not drop-in due to speed limitation. |
| AD7980BRMZ | 16-bit, 1 MSPS; 10-lead MSOP; 91 dB SINAD; requires external reference; higher supply current (30 mW @ 500 kSPS). | Designed for higher-speed multiplexed systems needing >500 kSPS per channel-e.g., multichannel vibration analysis. | Choose AD7980BRMZ only when ≥1 MSPS is required; incompatible pinout (different CNV/SDO timing behavior) and higher power demand preclude direct substitution. |
Compared with AD7685BRMZ and AD7980BRMZ, the AD7686BRMZRL7 uniquely balances 500 kSPS throughput, ultra-low standby current (1 nA), and integrated reference flexibility-making it optimal for portable, battery-constrained, medium-speed precision acquisition where neither lower nor higher speed alternatives satisfy the full requirement set.
Availability
AD7686BRMZRL7 is available at Aetrix Electronics and suitable for battery-powered equipment, medical instruments, industrial process controls, and portable test equipment requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7686BRMZRL7 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, serving industrial, automotive, communications, and healthcare markets.
The AD7686BRMZRL7 belongs to Analog Devices' PulSAR® family of precision SAR ADCs-designed specifically for high-resolution, low-power, no-latency data acquisition in portable and embedded instrumentation.
FAQ
What is the maximum sampling rate supported by the AD7686BRMZRL7?
The AD7686BRMZRL7 supports a maximum throughput of 500 kSPS, corresponding to a minimum conversion cycle time of 2 µs. This is achieved with a 1.6 µs conversion time (tCONV) and 400 ns acquisition time (tACQ), enabling accurate sampling of signals up to 200 kHz bandwidth. At this rate, power dissipation is 15–21.5 mW with VDD = 5 V.
Does the AD7686BRMZRL7 require an external reference voltage?
Yes, the AD7686BRMZRL7 requires an external reference voltage applied to the REF pin. The REF input accepts 0.5 V to VDD (up to 5.5 V), and the analog input range is 0 V to VREF differentially between IN+ and IN−. A 10 µF ceramic capacitor must be placed directly at the REF pin for stability, as specified in the datasheet.
Can the AD7686BRMZRL7 interface directly with a 1.8 V microcontroller?
Yes, the AD7686BRMZRL7 supports 1.8 V logic levels via its dedicated VIO supply pin. When VIO = 1.8 V, digital inputs (CNV, SDI, SCK) recognize VIH ≥ 1.26 V and VIL ≤ 0.54 V, and SDO outputs VOH ≥ 1.5 V and VOL ≤ 0.4 V-enabling direct connection to 1.8 V MCUs without level-shifting circuitry.
Is the AD7686BRMZRL7 pin-compatible with other PulSAR® ADCs?
Yes, the AD7686BRMZRL7 is pin-for-pin compatible with AD7685, AD7687, and AD7688 in the 10-lead MSOP package. This allows drop-in replacement within the same footprint for design upgrades or downgrades based on speed (250 kSPS vs. 500 kSPS) or reference integration needs-without PCB layout changes.
What is the significance of the "pseudo-differential" input architecture in the AD7686BRMZRL7?
The pseudo-differential input of the AD7686BRMZRL7 accepts a voltage difference between IN+ and IN−, where IN− serves as a ground sense node-not a true differential pair. This architecture rejects common-mode noise, accommodates remote ground sensing, and simplifies signal conditioning versus fully differential designs-while maintaining 16-bit precision and 92.5 dB SINAD performance.
AD7686BRMZRL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7686BRMZRL7 FAQ
1.How can I place an order for AD7686BRMZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7686BRMZRL7 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 AD7686BRMZRL7 reliable?
The price and inventory of AD7686BRMZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7686BRMZRL7 is usually 5 days.
3.What payment methods are accepted for AD7686BRMZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7686BRMZRL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7686BRMZRL7?
AD7686BRMZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7686BRMZRL7 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 AD7686BRMZRL7?
For technical support, including AD7686BRMZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7686BRMZRL7 requirements.
6.How does Aetrix verify that AD7686BRMZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7686BRMZRL7 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 AD7686BRMZRL7 meets industry standards.
7.What is the process for return or replacement of AD7686BRMZRL7?
All AD7686BRMZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7686BRMZRL7, 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 AD7686BRMZRL7 part is unused and in its original packaging.
Return procedure for AD7686BRMZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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