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Analog Devices Inc. AD7686CCPZRL7
- Part No.:
- AD7686CCPZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
AD7686CCPZRL7.pdf
- Description:
- IC ADC 16BIT SAR 10LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:990
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Product details
Overview
AD7686CCPZRL7 from Analog Devices is a 16-bit, pseudo-differential, successive approximation register (SAR) analog-to-digital converter (ADC) operating at 500 kSPS with no missing codes, ±0.6 LSB typical INL, and 92.5 dB SINAD at 20 kHz. It features single-supply 5 V operation, 1.8 V–5 V logic interface via dedicated VIO pin, and zero pipeline delay-enabling precise timing-critical sampling in portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the AD7686CCPZRL7 datasheet, AD7686CCPZRL7 pinout, AD7686CCPZRL7 application, or AD7686CCPZRL7 equivalent, key selection considerations include its 10-lead MSOP/LFCSP package compatibility, daisy-chain-capable SPI/QSPI/MICROWIRE interface, low 1 nA standby current, and true 16-bit linearity over −40°C to +85°C without external calibration.
Technical Context
The AD7686CCPZRL7 employs a charge redistribution SAR architecture with on-chip track-and-hold, eliminating pipeline latency and enabling immediate result availability after conversion. Its pseudo-differential input accepts 0 V to VREF (up to VDD) with respect to IN−, supporting remote ground sensing and rejecting common-mode noise up to 70 dB at 100 kHz.
Conversion is initiated by the CNV rising edge, triggering a 1.6 µs max conversion time and 400 ns acquisition window. The proprietary serial interface supports CS mode (3- or 4-wire) and Chain mode, with optional busy indicator and SDI-driven daisy-chaining of multiple ADCs on one SDO line.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage for precision measurement applications. |
| Throughput | 500 kSPS maximum - enables high-speed transient capture in oscilloscope-like data loggers and real-time control loops. |
| INL | ±0.6 LSB typical (±2 LSB max) - ensures <0.003% FSR absolute accuracy without post-calibration in sensor front-ends. |
| SINAD | 92.5 dB at 20 kHz (VREF = 5 V) - delivers >15.3 ENOB for high-fidelity signal reconstruction in medical and audio-grade acquisition. |
| Power @ 100 kSPS | 3.75 mW at 5 V - supports energy-constrained designs such as handheld meters and wireless sensor nodes. |
| Standby Current | 1 nA at 25°C - enables multi-year battery life in intermittent-sampling applications like environmental monitoring. |
| Analog Input Range | 0 V to VREF (0.5 V to VDD), pseudo-differential - simplifies sensor interfacing with single-ended sources while maintaining CMRR >65 dB. |
| Digital Interface | SPI-/QSPI-/MICROWIRE-/DSP-compatible, 3- or 4-wire, daisy-chain capable - reduces host GPIO count and PCB routing complexity in multi-channel systems. |
Pinout & Package
AD7686CCPZRL7 is housed in a 10-lead LFCSP (3 mm × 3 mm, SOT-23 size) with exposed pad (EPAD) requiring connection to GND for thermal performance. Pinout matches the 10-lead MSOP variant and is pin-for-pin compatible with AD7685/AD7687/AD7688.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference Input Voltage | Accepts 0.5 V to VDD; must be decoupled with 10 µF ceramic capacitor-sets full-scale range and directly impacts gain error and SNR. |
| 2 - VDD | Analog Power Supply | 4.5 V to 5.5 V supply; powers core ADC and internal track-and-hold-requires local 100 nF bypassing. |
| 3 - IN+ | Pseudo-Differential Analog Input | Input voltage measured relative to IN−; 0 V to VREF range-supports direct connection to transducer outputs or op-amp buffers. |
| 4 - IN− | Analog Ground Sense | Reference node for IN+; connects to remote sensor ground or local AGND-enables rejection of ground loop noise. |
| 5 - GND | Power Supply Ground | Common return for VDD, REF, and digital supplies-must be low-impedance and separated from noisy digital planes. |
| 6 - CNV | Convert Input / Interface Mode Select | Rising edge initiates conversion; logic level at CNV edge selects CS or Chain mode-critical for synchronous multi-ADC sampling. |
| 7 - SDO | Serial Data Output | 16-bit straight-binary output synchronized to SCK; tri-state when CNV/SDI high in CS mode-enables shared bus architectures. |
| 8 - SCK | Serial Clock Input | Drives data shift-out; timing varies with VIO (17–20 ns min period)-supports interoperability with 1.8 V–5 V controllers. |
| 9 - SDI | Serial Data Input / Mode Control | Low at CNV edge enables Chain mode (daisy-chain); high enables CS mode-eliminates need for separate mode pins. |
| 10 - VIO | Digital I/O Power Supply | 1.8 V to VDD + 0.3 V; sets logic thresholds for all digital pins-allows seamless integration with mixed-voltage SoCs and FPGAs. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Conversion results available immediately after completion-enables deterministic latency for closed-loop control and trigger-based acquisition. |
| Proprietary SPI-compatible interface | Supports CS and Chain modes with optional busy indicator-reduces firmware overhead and eliminates polling in resource-constrained microcontrollers. |
| Ultra-low standby current | 1 nA at 25°C-permits aggressive power gating between samples without sacrificing wake-up time or accuracy. |
| Wide reference voltage range | 0.5 V to VDD (up to 5.5 V)-enables flexible scaling from low-noise 2.5 V references to full-supply rail references for maximum dynamic range. |
| Pseudo-differential input architecture | IN+ referenced to IN− with >65 dB CMRR at 100 kHz-rejects ground bounce and EMI in industrial environments without differential driver cost. |
| Pin-for-pin compatibility | With AD7685/AD7687/AD7688-allows design reuse and migration across 16-bit PulSAR family variants without layout changes. |
Applications
| Portable Data Logger | Medical Patient Monitor |
|---|---|
Use Scenario: Battery-powered field recorder capturing temperature, pressure, and ECG waveforms at ≤100 kSPS with 16-bit fidelity over 10+ hours. IC Role / Device Role / Timing Role: Primary high-accuracy ADC acquiring conditioned analog sensor outputs; zero-latency conversion enables real-time waveform display and alarm triggering. Use Value: 1 nA standby current extends battery life; 92.5 dB SINAD ensures diagnostic-grade signal integrity; 500 kSPS headroom supports burst-mode acquisition. |
Use Scenario: Multi-parameter bedside monitor digitizing biopotential signals (ECG, EEG) and vital signs (SpO₂, NIBP) with isolated front-end and low EMI. IC Role / Device Role / Timing Role: Isolated-side ADC converting amplified, filtered analog inputs; pseudo-differential input rejects common-mode interference from switching power supplies. Use Value: ±0.6 LSB INL maintains clinical accuracy across temperature; 1.6 µs conversion time enables tight synchronization with isolation gate drivers. |
| Industrial Process Controller | Test & Measurement Equipment |
Use Scenario: PLC analog input module acquiring 4–20 mA sensor signals and thermocouple outputs across 8 channels with cold-junction compensation. IC Role / Device Role / Timing Role: Channelized ADC in multiplexed configuration; daisy-chained interface reduces digital routing and controller pin count. Use Value: Pin compatibility with AD7685 allows scalable channel density; 70 dB CMRR suppresses 50/60 Hz mains noise in factory-floor environments. |
Use Scenario: Benchtop multimeter or oscilloscope digitizer requiring 16-bit resolution, fast settling, and minimal dead time between samples. IC Role / Device Role / Timing Role: High-speed acquisition engine with immediate result availability; no pipeline delay enables gap-free sampling at full 500 kSPS rate. Use Value: 92.5 dB SINAD meets Class A DMM specifications; 3.75 mW power at 100 kSPS permits fanless thermal design in compact enclosures. |
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 16-bit SAR architecture, 250 kSPS throughput, 10-lead MSOP only, no LFCSP option; 91 dB SINAD at 20 kHz. | Limited to lower-speed applications where 500 kSPS headroom is unnecessary; lacks AD7686CCPZRL7's 1 nA standby current. | Select AD7685BRMZ for cost-sensitive, space-tolerant designs needing proven reliability at ≤250 kSPS. |
| AD7980BRMZ | 16-bit SAR, 1 MSPS throughput, wider 2.3–5.5 V VDD range, but higher 7 mW power at 500 kSPS and no 1 nA standby mode. | Better suited for high-throughput systems with ample power budget; lacks AD7686CCPZRL7's ultra-low-power sleep state. | Choose AD7980BRMZ when sampling speed >500 kSPS is required and standby current is not critical. |
Compared with AD7685BRMZ and AD7980BRMZ, AD7686CCPZRL7 uniquely balances 500 kSPS speed, 16-bit linearity, and nanoamp-level standby-making it optimal for battery longevity without sacrificing acquisition fidelity or interface flexibility.
Availability
AD7686CCPZRL7 is available at Aetrix Electronics and suitable for portable instrumentation, medical patient monitors, and industrial process controllers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7686CCPZRL7 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, with R&D and manufacturing facilities worldwide.
The AD7686CCPZRL7 belongs to the PulSAR® family of precision SAR ADCs, designed specifically for high-resolution, low-power, and low-latency data acquisition in battery-operated and space-constrained systems.
FAQ
What is the maximum recommended reference voltage for AD7686CCPZRL7?
The AD7686CCPZRL7 supports an external reference voltage (REF) from 0.5 V up to VDD, with VDD rated from 4.5 V to 5.5 V. Therefore, the maximum recommended REF is 5.5 V. However, for optimal performance-including 92.5 dB SINAD and minimal THD-the datasheet specifies testing at VREF = VDD = 5 V. Using REF > VDD may violate absolute maximum ratings and is not supported.
Does AD7686CCPZRL7 require an external clock source for conversion?
No, AD7686CCPZRL7 does not require an external clock for the conversion process. It contains an on-board conversion clock, so the SCK signal is used solely for serial data readout-not for controlling the ADC core. Conversion is triggered by the CNV rising edge, and the result becomes available within 1.6 µs regardless of SCK activity.
Can AD7686CCPZRL7 operate with a 1.8 V digital interface while using 5 V analog supplies?
Yes, AD7686CCPZRL7 supports independent digital and analog supplies: VDD = 5 V (analog core) and VIO = 1.8 V (digital I/O). All digital pins (CNV, SDI, SCK, SDO) conform to 1.8 V logic levels when VIO = 1.8 V, enabling direct interfacing with low-voltage microcontrollers and FPGAs without level-shifting circuitry.
What is the purpose of the IN− pin on AD7686CCPZRL7?
The IN− pin on AD7686CCPZRL7 serves as the pseudo-differential ground sense reference for the IN+ input. It is not a true differential input pair but enables rejection of common-mode noise-especially ground potential differences-when connected to a remote sensor ground or quiet analog ground plane. This improves CMRR to >65 dB at 100 kHz without requiring a differential driver amplifier.
Is AD7686CCPZRL7 pin-compatible with other PulSAR ADCs?
Yes, AD7686CCPZRL7 is explicitly pin-for-pin compatible with AD7685, AD7687, and AD7688 in both 10-lead MSOP and 10-lead LFCSP packages. This allows drop-in replacement across the 16-bit PulSAR family for throughput or feature upgrades-such as moving from 250 kSPS (AD7685) to 500 kSPS (AD7686CCPZRL7)-without PCB redesign.
AD7686CCPZRL7 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:
- -
AD7686CCPZRL7 FAQ
1.How can I place an order for AD7686CCPZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7686CCPZRL7 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 AD7686CCPZRL7 reliable?
The price and inventory of AD7686CCPZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7686CCPZRL7 is usually 5 days.
3.What payment methods are accepted for AD7686CCPZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7686CCPZRL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7686CCPZRL7?
AD7686CCPZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7686CCPZRL7 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 AD7686CCPZRL7?
For technical support, including AD7686CCPZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7686CCPZRL7 requirements.
6.How does Aetrix verify that AD7686CCPZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7686CCPZRL7 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 AD7686CCPZRL7 meets industry standards.
7.What is the process for return or replacement of AD7686CCPZRL7?
All AD7686CCPZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7686CCPZRL7, 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 AD7686CCPZRL7 part is unused and in its original packaging.
Return procedure for AD7686CCPZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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