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Analog Devices Inc. AD7686BCPZRL7
- Part No.:
- AD7686BCPZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
AD7686BCPZRL7.pdf
- Description:
- IC ADC 16BIT SAR 10LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,884
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Product details
Overview
AD7686BCPZRL7 from Analog Devices is a 16-bit, charge redistribution successive approximation analog-to-digital converter (ADC) with 500 kSPS throughput, ±0.6 LSB typical INL, 92.5 dB SINAD at 20 kHz, and pseudo-differential input range of 0 V to VREF. It operates from a single 5 V supply with 1.8 V–5 V logic interface and is housed in a 10-lead MSOP package for precision data acquisition in battery-powered instrumentation.
For engineers reviewing the AD7686BCPZRL7 datasheet, AD7686BCPZRL7 pinout, AD7686BCPZRL7 application, or AD7686BCPZRL7 equivalent, key selection criteria include its no-pipeline-delay architecture, daisy-chain SPI-compatible serial interface, 1 nA standby current, 2.5 ns aperture delay, and compatibility with external references up to VDD.
Technical Context
The AD7686BCPZRL7 implements a charge redistribution SAR architecture with on-chip track-and-hold, enabling true 16-bit resolution without missing codes and zero pipeline latency. Its conversion is initiated by the CNV rising edge, sampling the differential voltage between IN+ and IN− referenced to GND.
It supports three interface modes-CS 3-wire, CS 4-wire, and Chain mode-with programmable busy indicator and daisy-chain capability via SDI/SDO. The separate VIO supply (1.8 V–5 V) enables direct interfacing with mixed-voltage digital systems while maintaining full 500 kSPS throughput.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage across full-scale range. |
| Throughput | 500 kSPS maximum - supports real-time sampling of signals up to 200 kHz bandwidth with adequate Nyquist margin. |
| INL | ±0.6 LSB typical (±2 LSB max) - ensures <0.003% FSR linearity error for high-accuracy sensor and metrology applications. |
| SINAD | 92.5 dB at 20 kHz (VREF = 5 V) - delivers ~15.4 ENOB, suitable for precision DC and AC measurements. |
| Aperture Delay | 2.5 ns - minimizes sampling uncertainty for high-frequency signal capture and time-critical synchronization. |
| Standby Current | 1 nA at 25°C - enables ultra-low-power sleep states in portable and energy-harvesting systems. |
| Supply Range | VDD = 4.5 V–5.5 V; VIO = 1.8 V–VDD + 0.3 V - allows flexible host interface voltage scaling without level shifters. |
Pinout & Package
The AD7686BCPZRL7 is packaged in a 10-lead MSOP (3 mm × 3 mm), RoHS-compliant, with exposed pad thermally connected to GND. Pin 1 is REF; pin 5 is GND; pin 6 is CNV; pin 10 is VIO. The exposed pad must be soldered to a GND plane for thermal stability but is not required for electrical performance compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF (Pin 1) | Analog reference input | Accepts 0.5 V–VDD external reference; requires local 10 µF decoupling; sets full-scale range for IN+–IN−. |
| VDD (Pin 2) | Analog power supply | 4.5 V–5.5 V single supply powering core ADC, track-and-hold, and internal clock. |
| IN+ (Pin 3) | Pseudo-differential analog input | High-impedance sampling node; voltage measured relative to IN−; supports 0 V to VREF range. |
| IN− (Pin 4) | Analog ground sense | Reference point for IN+; used for remote ground sensing to reject common-mode noise and ground offsets. |
| GND (Pin 5) | Power ground | Common return for VDD, REF, and analog circuitry; must be low-impedance and separated from digital ground where possible. |
| CNV (Pin 6) | Convert control input | Rising edge initiates conversion and selects interface mode (CS vs. Chain); doubles as chip select in CS mode. |
| SDO (Pin 7) | Serial data output | 16-bit straight-binary result synchronized to SCK; tri-state controlled by CNV/SDI in CS mode. |
| SCK (Pin 8) | Serial clock input | Drives data readout; minimum period 15 ns (VIO > 4.5 V); supports up to ~66 MHz interface clock. |
| SDI (Pin 9) | Serial data input / mode select | Configures interface mode on CNV edge (low = Chain, high = CS); enables daisy-chain data forwarding. |
| VIO (Pin 10) | Digital I/O supply | 1.8 V–5 V logic interface supply; defines VIH/VIL thresholds and drives SDO output levels. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Conversion result available immediately after tCONV (≤1.6 µs); eliminates latency-induced timing errors in closed-loop control. |
| Daisy-chain capability | Multiple AD7686BCPZRL7 units share one SDO line using SDI as data-forwarding input; reduces PCB routing and controller GPIO count. |
| Separate VIO supply | Enables direct connection to 1.8 V, 2.5 V, 3 V, or 5 V logic without level-shifting components or signal integrity degradation. |
| Ultra-low standby current | 1 nA shutdown current allows multi-year battery life in intermittent-sampling applications like wireless sensor nodes. |
| Pin-for-pin compatibility | Direct replacement for AD7685, AD7687, and AD7688 in existing MSOP-10 layouts-no PCB revision required. |
Applications
| Medical Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: High-resolution ECG front-end digitizing low-amplitude biopotential signals with minimal noise and drift. IC Role / Device Role / Timing Role: Primary 16-bit ADC capturing differential lead signals at ≥1 kSPS with precise timing alignment and no latency-induced phase distortion. Use Value: 92.5 dB SINAD and ±0.6 LSB INL ensure accurate R-wave detection and ST-segment analysis under clinical-grade specifications. | Use Scenario: Modular industrial DAQ module acquiring multiple sensor channels (pressure, temperature, strain) with synchronized sampling. IC Role / Device Role / Timing Role: Channel-isolated ADC per sensor input, triggered via shared CNV line; daisy-chained SDO simplifies FPGA or MCU interface. Use Value: 500 kSPS throughput and 2.5 ns aperture delay enable sub-microsecond inter-channel skew control for coherent multi-channel capture. |
| Battery-Powered Test Equipment | Process Control Sensors |
Use Scenario: Handheld multimeter or portable oscilloscope requiring high DC accuracy and low power consumption between measurements. IC Role / Device Role / Timing Role: Precision ADC operating in burst mode-active only during measurement windows, then entering 1 nA standby state. Use Value: 3.75 µW at 100 SPS and ±0.1 mV offset error over temperature support 4½-digit DC voltage measurement accuracy. | Use Scenario: Loop-powered 4–20 mA transmitter digitizing RTD or thermocouple outputs in hazardous environments. IC Role / Device Role / Timing Role: Isolated-side ADC converting conditioned analog inputs; powered from loop-derived 5 V rail with strict current budget. Use Value: Single 5 V supply operation and 3.75 mW at 100 kSPS fit within 3.5 mA loop power envelope while delivering 16-bit resolution. |
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 |
|---|---|---|---|
| AD7685BCPZRL7 | Same 10-lead MSOP package, 250 kSPS max throughput, 91.5 dB SINAD, lower power (2.5 mW @ 100 kSPS). | Lower speed and SNR; suitable for cost-sensitive, lower-bandwidth instrumentation where 500 kSPS is unnecessary. | Select AD7685BCPZRL7 when system sampling rate ≤250 kSPS and board space/power budget are tighter. |
| AD7980BRMZ | 16-bit, 1 MSPS, 91 dB SINAD, 10-lead MSOP, but requires external reference and has higher 12 mW power at full speed. | Higher throughput but reduced AC performance and higher quiescent current; lacks integrated reference buffer and daisy-chain mode. | Select AD7980BRMZ only if >500 kSPS is mandatory and system can accommodate higher power and external reference design complexity. |
Compared with AD7685BCPZRL7 and AD7980BRMZ, the AD7686BCPZRL7 uniquely balances 500 kSPS speed, 92.5 dB SINAD, 1 nA standby, and daisy-chain capability in a drop-in MSOP footprint-making it optimal for portable, multi-channel, battery-constrained precision systems.
Availability
AD7686BCPZRL7 is available at Aetrix Electronics and suitable for medical instrumentation, industrial data acquisition, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7686BCPZRL7 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 AD7686BCPZRL7 belongs to the PulSAR® family of precision SAR ADCs, designed specifically for high-speed, low-power, high-accuracy data acquisition in portable, industrial, and medical systems where latency, linearity, and power efficiency are critical.
FAQ
What is the maximum recommended reference voltage for the AD7686BCPZRL7?
The AD7686BCPZRL7 supports an external reference voltage from 0.5 V up to VDD. With VDD = 5 V, the maximum reference is 5 V. Using VREF = VDD simplifies design by eliminating a separate reference IC, and maintains full 16-bit performance with 92.5 dB SINAD and ±0.6 LSB INL as specified in the datasheet for AD7686BCPZRL7.
Does the AD7686BCPZRL7 require an external driver amplifier for all input configurations?
No-the AD7686BCPZRL7 includes an on-chip track-and-hold and can accept low-impedance sources directly. However, for high-source-impedance sensors or wideband signals (>100 kHz), an external driver (e.g., ADA4941) is recommended to maintain THD and settling performance. The AD7686BCPZRL7's input impedance drops during acquisition, so driver selection must account for RIN ≈ 600 Ω and CIN ≈ 30 pF.
Can the AD7686BCPZRL7 operate with a 3.3 V digital interface while using a 5 V analog supply?
Yes. The AD7686BCPZRL7 features a dedicated VIO pin that accepts 1.8 V–5 V independently of VDD. Setting VIO = 3.3 V configures digital inputs (CNV, SDI, SCK) and output (SDO) to 3.3 V logic levels while VDD remains at 5 V for optimal analog performance-enabling seamless integration with 3.3 V microcontrollers without level shifters.
Is the AD7686BCPZRL7 pin-compatible with other PulSAR ADCs in the same package?
Yes. The AD7686BCPZRL7 is explicitly pin-for-pin compatible with AD7685BCPZRL7, AD7687BCPZRL7, and AD7688BCPZRL7 in the 10-lead MSOP package. This allows direct substitution in existing designs, provided the system's throughput, INL, and SINAD requirements align with the selected variant's specifications.
What is the significance of the exposed pad on the AD7686BCPZRL7 MSOP package?
The exposed pad on the AD7686BCPZRL7 MSOP package must be soldered to a GND plane for thermal dissipation and improved EMI immunity. While not required for basic electrical functionality, grounding the pad reduces junction temperature rise by ~44°C/W (θJC), enhances long-term reliability, and stabilizes reference and analog performance-especially under sustained 500 kSPS operation.
AD7686BCPZRL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 10-VFDFN Exposed Pad, CSP
- 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-LFCSP-WD (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7686BCPZRL7 FAQ
1.How can I place an order for AD7686BCPZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7686BCPZRL7 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 AD7686BCPZRL7 reliable?
The price and inventory of AD7686BCPZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7686BCPZRL7 is usually 5 days.
3.What payment methods are accepted for AD7686BCPZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7686BCPZRL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7686BCPZRL7?
AD7686BCPZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7686BCPZRL7 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 AD7686BCPZRL7?
For technical support, including AD7686BCPZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7686BCPZRL7 requirements.
6.How does Aetrix verify that AD7686BCPZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7686BCPZRL7 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 AD7686BCPZRL7 meets industry standards.
7.What is the process for return or replacement of AD7686BCPZRL7?
All AD7686BCPZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7686BCPZRL7, 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 AD7686BCPZRL7 part is unused and in its original packaging.
Return procedure for AD7686BCPZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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