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Analog Devices Inc. AD7687BRMZRL7
- Part No.:
- AD7687BRMZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7687BRMZRL7.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,937
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Product details
Overview
AD7687BRMZRL7 from Analog Devices is a 16-bit, successive-approximation analog-to-digital converter (ADC) with true differential input, ±VREF range, 250 kSPS throughput, ±1.5 LSB max INL, and no missing codes. It operates from a single 2.3 V to 5.5 V supply, supports 1.8 V–5 V logic via separate VIO, and targets precision data acquisition in space-constrained, low-power systems.
For engineers reviewing the AD7687BRMZRL7 datasheet, AD7687BRMZRL7 pinout, AD7687BRMZRL7 application, or AD7687BRMZRL7 equivalent, this page delivers verified specifications, MSOP-10 pin mapping, real-world use cases in medical instrumentation and battery-powered sensors, and validated alternative options for design continuity.
Technical Context
The AD7687BRMZRL7 employs a charge redistribution SAR architecture with integrated track-and-hold, delivering zero pipeline delay and 1.8 µs transient response to full-scale steps. Its differential input accepts ±VREF (up to VDD) with 65 dB CMRR at 250 kHz and 2 MHz −3 dB bandwidth.
It features a SPI/QSPI/MICROWIRE/DSP-compatible serial interface supporting both CS-mode (3-/4-wire) and daisy-chain mode, with optional BUSY indication via SDI. Power scales linearly with throughput: 1.35 mW at 2.5 V/100 kSPS and only 1.4 µW at 2.5 V/100 SPS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage across temperature. |
| Throughput | 250 kSPS at VDD = 4.5–5.5 V - enables high-speed sampling for dynamic signal capture without latency. |
| INL | ±1.5 LSB max (±23 ppm of FSR) - ensures high absolute accuracy for calibrated measurement systems. |
| SNR | 95.5 dB at 20 kHz, VREF = 5 V - supports >15.7 ENOB for clean digitization of low-noise analog signals. |
| Supply Range | VDD = 2.3 V to 5.5 V; VIO = 1.8 V to VDD + 0.3 V - allows direct interfacing with 1.8 V, 2.5 V, 3 V, or 5 V microcontrollers. |
| Power @ 100 kSPS | 1.35 mW at 2.5 V - enables multi-year battery life in portable instrumentation with minimal thermal impact. |
| Standby Current | 1 nA - facilitates ultra-low-power sleep states in energy-harvesting or wake-on-event designs. |
Pinout & Package
AD7687BRMZRL7 is packaged in a 10-lead MSOP (3 mm × 3 mm), RoHS-compliant, surface-mount package with exposed pad not connected (MSOP variant). Pin functions are electrically identical to the LFCSP version but lack EPAD grounding requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REF | Analog Input | External reference voltage input (0.5 V to VDD); requires 10 µF decoupling capacitor for noise immunity. |
| 2 VDD | Power Supply | Main analog/digital supply (2.3 V–5.5 V); powers internal circuitry and reference buffer. |
| 3 IN+ | Analog Input | Differential positive input; accepts voltage from −VREF to +VREF relative to IN−. |
| 4 IN− | Analog Input | Differential negative input; common-mode range is 0 V to VREF/2 + 0.1 V. |
| 5 GND | Power Ground | Analog and digital ground reference; must be low-impedance and star-connected to minimize noise coupling. |
| 6 CNV | Digital Input | Convert trigger and interface mode selector; rising edge initiates conversion and determines CS vs. chain mode. |
| 7 SDO | Digital Output | 16-bit two's complement serial output; doubles as BUSY indicator when enabled in chain mode. |
| 8 SCK | Digital Input | Serial clock input; controls data shift timing and enables BUSY feature based on level at CNV edge. |
| 9 SDI | Digital Input | Mode-select input (CS vs. chain) and daisy-chain data input; sets interface configuration on CNV rising edge. |
| 10 VIO | Power Supply | Independent I/O voltage rail (1.8 V–VDD+0.3 V); isolates logic interface from analog supply noise. |
Key Features
| Feature | Design Value |
|---|---|
| True differential input | Supports ±VREF range with 65 dB CMRR at 250 kHz - rejects common-mode noise in noisy industrial environments. |
| No pipeline delay | Zero-latency conversion result available immediately after tCONV (≤2.2 µs) - essential for real-time closed-loop control. |
| Daisy-chain capability | Enables synchronous readout of multiple AD7687BRMZRL7 devices on one 3-wire bus - reduces MCU GPIO count and PCB routing complexity. |
| Ultra-low standby current | 1 nA at 5 V - extends battery life in intermittent-sampling applications like environmental sensor nodes. |
| Pin-for-pin compatibility | Interchangeable with AD7685, AD7686, and AD7688 - simplifies design reuse and performance scaling across 100–500 kSPS variants. |
Applications
| Portable ECG Monitor | Industrial Process Sensor Node |
|---|---|
Use Scenario: Continuous acquisition of low-amplitude, high-impedance biopotential signals from dry electrodes under motion artifacts. IC Role / Device Role / Timing Role: Primary ADC capturing differential lead-II ECG waveforms at 250 kSPS with 95.5 dB SNR and <1.5 LSB INL for diagnostic-grade fidelity. Use Value: Enables accurate R-wave detection and ST-segment analysis without external amplification or calibration drift compensation. |
Use Scenario: Multi-channel temperature/pressure monitoring in distributed PLC I/O modules with strict power budgets. IC Role / Device Role / Timing Role: High-precision front-end ADC for isolated sensor interfaces, operating at 100 kSPS with 1.35 mW dissipation and 1.8 µs settling. Use Value: Reduces thermal load in sealed enclosures while maintaining 16-bit resolution across −40°C to +85°C ambient range. |
| Battery-Powered Data Logger | Medical Infusion Pump Feedback Loop |
Use Scenario: Long-duration environmental logging (temperature, humidity, gas concentration) powered by coin-cell or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Low-power SAR ADC sampling at 100 SPS with 1.4 µW consumption and 1 nA standby current between measurements. Use Value: Achieves >10-year operational life on a single CR2032 cell while preserving 16-bit resolution for calibration traceability. |
Use Scenario: Real-time pressure and flow sensing in closed-loop motor control for precise drug delivery accuracy. IC Role / Device Role / Timing Role: Zero-latency ADC feeding PID controller with immediate conversion results post-CNV edge, eliminating pipeline-induced phase lag. Use Value: Ensures sub-millisecond response to occlusion events and maintains ±0.5% volumetric accuracy over lifetime. |
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 | 100 kSPS max, same 10-lead MSOP package and pinout; lower power (0.7 mW @ 100 kSPS) but reduced speed and SNR (92 dB). | Suitable for cost-sensitive, lower-bandwidth systems where 250 kSPS is unnecessary. | Select AD7685BRMZ if throughput ≤100 kSPS suffices and board layout reuse is critical. |
| AD7688BCPZ-RL7 | 500 kSPS, 10-lead LFCSP only; higher power (22 mW @ 5 V/500 kSPS), improved THD (−120 dB), but no MSOP option. | Required for high-speed multiplexed channel systems needing >250 kSPS per channel. | Choose AD7688BCPZ-RL7 only when speed >250 kSPS is mandatory and LFCSP assembly is supported. |
Compared with AD7687BRMZRL7, AD7685BRMZ trades speed for lower power and cost in static-sensing roles, while AD7688BCPZ-RL7 delivers double the throughput at the expense of higher dissipation and incompatible packaging-making AD7687BRMZRL7 the optimal balance for portable, precision, medium-speed data acquisition.
Availability
AD7687BRMZRL7 is available at Aetrix Electronics and suitable for battery-powered equipment, medical instruments, and process controls requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for AD7687BRMZRL7 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 Norwood, MA.
The AD7687BRMZRL7 belongs to the PulSAR® family of precision SAR ADCs, designed specifically for high-resolution, low-power, single-supply data acquisition in portable, industrial, and medical instrumentation.
FAQ
What is the maximum recommended reference voltage for AD7687BRMZRL7?
The AD7687BRMZRL7 supports an external reference voltage (REF) from 0.5 V up to VDD. When VDD = 5.5 V, REF may be set to 5.5 V; however, typical operation uses 2.5 V or 5 V references to maximize SNR (95.5 dB at 5 V) and maintain stability. Exceeding VDD risks damage per Absolute Maximum Ratings.
Does AD7687BRMZRL7 require an external driver amplifier for its differential inputs?
The AD7687BRMZRL7 includes an integrated track-and-hold with 2 MHz −3 dB input bandwidth and 1 nA input leakage, enabling direct connection to low-impedance sources (<1 kΩ). For high-impedance or noisy sensors, a low-noise, low-distortion amplifier (e.g., ADA4898-1) is recommended to preserve SNR and THD performance.
Can AD7687BRMZRL7 operate with a 1.8 V logic interface while using a 5 V analog supply?
Yes. AD7687BRMZRL7 separates analog (VDD) and digital I/O (VIO) supplies. With VDD = 5 V and VIO = 1.8 V, it fully complies with 1.8 V logic levels (VIH = 1.26 V min, VIL = 0.54 V max) and drives SDO to VOH ≥ 1.5 V, ensuring robust communication with 1.8 V microcontrollers without level shifters.
Is AD7687BRMZRL7 pin-compatible with AD7686BRMZ?
Yes. AD7687BRMZRL7 is explicitly specified as pin-for-pin compatible with AD7685, AD7686, and AD7688 in the datasheet. All share identical 10-lead MSOP/LFCSP pinouts, register maps, and interface protocols-enabling drop-in replacement for throughput scaling (100 → 250 → 500 kSPS) without PCB redesign.
What is the aperture delay specification for AD7687BRMZRL7?
The AD7687BRMZRL7 has a typical aperture delay of 2.5 ns at VDD = 5 V, defined as the time between the CNV rising edge and the instant the input signal is held for conversion. This ultra-low value minimizes sampling uncertainty in high-frequency signal acquisition and supports accurate time-domain analysis.
AD7687BRMZRL7 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):
- 250k
- Number of Inputs:
- 1
- Input Type:
- 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:
- 2.3V ~ 5.5V
- Voltage - Supply, Digital:
- 2.3V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7687BRMZRL7 FAQ
1.How can I place an order for AD7687BRMZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7687BRMZRL7 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 AD7687BRMZRL7 reliable?
The price and inventory of AD7687BRMZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7687BRMZRL7 is usually 5 days.
3.What payment methods are accepted for AD7687BRMZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7687BRMZRL7 transactions.
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4.How is shipping managed for AD7687BRMZRL7?
AD7687BRMZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7687BRMZRL7 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 AD7687BRMZRL7?
For technical support, including AD7687BRMZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7687BRMZRL7 requirements.
6.How does Aetrix verify that AD7687BRMZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7687BRMZRL7 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 AD7687BRMZRL7 meets industry standards.
7.What is the process for return or replacement of AD7687BRMZRL7?
All AD7687BRMZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7687BRMZRL7, 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 AD7687BRMZRL7 part is unused and in its original packaging.
Return procedure for AD7687BRMZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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