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Analog Devices Inc. AD7686CRMZRL7
- Part No.:
- AD7686CRMZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7686CRMZRL7.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,546
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Product details
Overview
AD7686CRMZRL7 from Analog Devices is a 16-bit, 500 kSPS pseudo-differential successive approximation ADC operating from a single 5 V supply with no pipeline delay, ±2 LSB max INL, 92.5 dB SINAD at 20 kHz, and 1 nA standby current - deployed in battery-powered instrumentation and medical data acquisition systems.
For engineers reviewing the AD7686CRMZRL7 datasheet, AD7686CRMZRL7 pinout, AD7686CRMZRL7 application, or AD7686CRMZRL7 equivalent, this page delivers verified specifications, MSOP-10 pin mapping, real-world use cases, and two confirmed alternative parts for precision analog-to-digital conversion in low-power, high-accuracy embedded systems.
Technical Context
The AD7686CRMZRL7 implements a charge redistribution SAR architecture with on-chip track-and-hold, enabling true 16-bit resolution without missing codes and zero latency conversion. Its acquisition phase completes in 400 ns, and aperture delay is fixed at 2.5 ns (VDD = 5 V), ensuring precise timing alignment for multiplexed channel sampling.
It supports flexible digital interfacing via SPI-/QSPI-/MICROWIRE-/DSP-compatible 3- or 4-wire protocols with daisy-chain capability and optional busy indicator, while VIO (1.8 V to 5 V) decouples logic-level compatibility from the 4.5–5.5 V analog supply - critical for mixed-voltage system integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full-scale code coverage for metrology-grade measurements. |
| Throughput | 500 kSPS maximum - enables real-time capture of signals up to ~200 kHz bandwidth (−3 dB input BW = 9 MHz). |
| INL | ±2 LSB max (±0.003% FSR) - ensures linearity error remains under 153 µV over 0–5 V range, critical for calibration-sensitive instruments. |
| SINAD | 92.5 dB at 20 kHz (VREF = 5 V) - corresponds to ~15.4 ENOB, supporting high-fidelity signal reconstruction in audio and sensor front-ends. |
| Power @ 100 kSPS | 3.75 mW (5 V) - scales linearly with throughput, enabling ultra-low power operation down to 3.75 µW at 100 SPS for extended battery life. |
| Standby Current | 1 nA - allows rapid wake-up from deep sleep without external power gating circuitry. |
| Analog Input Range | 0 V to VREF (VREF ≤ VDD) - supports pseudo-differential measurement with IN− as ground sense, rejecting common-mode noise up to 80 dB at 1 kHz. |
Pinout & Package
AD7686CRMZRL7 is housed in a 10-lead MSOP package (3 mm × 3 mm, 0.85 mm height) with exposed pad connected to GND per datasheet Figure 5. Pin numbering follows standard MSOP top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Analog reference input | Accepts 0.5 V to VDD; must be decoupled with 10 µF ceramic capacitor; sets full-scale range for IN+–IN− differential input. |
| 2 - VDD | Analog power supply | 4.5–5.5 V supply powering core ADC, track-and-hold, and internal clock; thermal impedance θJA = 200°C/W. |
| 3 - IN+ | Pseudo-differential analog input (+) | Input voltage referenced to IN−; absolute range −0.1 V to VDD + 0.1 V; 600 Ω series RIN + 30 pF CIN model during acquisition. |
| 4 - IN− | Analog ground sense input | Provides remote ground reference to reject ground loop errors; common-mode voltage limited to ±0.1 V relative to GND. |
| 5 - GND | Power and analog ground | Common return for VDD, REF, and analog inputs; exposed pad must be soldered to PCB ground plane. |
| 6 - CNV | Convert control input | Rising edge initiates conversion and selects interface mode (CS vs. chain); doubles as chip select enable in CS mode. |
| 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 shift-out; minimum period 15 ns (VIO > 4.5 V); supports daisy-chain timing with 16-cycle delay between ADCs. |
| 9 - SDI | Serial data input / mode select | Low at CNV rising edge enables chain mode; high enables CS mode; used for daisy-chain data injection in multi-ADC systems. |
| 10 - VIO | Digital I/O supply | 1.8–5 V logic interface supply; sets VIH/VIL thresholds and VOH/VOL levels; independent of VDD for mixed-voltage designs. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Conversion result available immediately after tCONV (≤1.6 µs); eliminates latency-induced phase errors in closed-loop control. |
| Proprietary SPI-compatible interface | Supports 3-wire CS mode (with optional busy indicator) and 3-wire chain mode - reduces PCB routing complexity in multi-channel systems. |
| Ultra-low standby current | 1 nA at 25°C - enables microcontroller-driven wake-on-event architectures without auxiliary power switches. |
| Pseudo-differential input architecture | IN− serves as dedicated ground sense node - rejects ground potential differences between sensor and ADC, improving CMRR to 80 dB at 1 kHz. |
| Pin-for-pin compatibility | Direct replacement for AD7685, AD7687, and AD7688 - simplifies design reuse and migration across 16-bit PulSAR family variants. |
Applications
| Portable ECG Monitor | Industrial Data Logger |
|---|---|
Use Scenario: Continuous 16-bit sampling of low-amplitude biopotential signals (0.5–5 mV) from dry electrodes in handheld ECG units with 7-day battery life. IC Role / Device Role / Timing Role: Primary analog front-end digitizer with pseudo-differential input rejecting electrode offset drift and 50/60 Hz mains interference. Use Value: 92.5 dB SINAD and ±2 LSB INL ensure diagnostic-grade waveform fidelity; 1 nA standby current extends battery runtime without sacrificing resolution. |
Use Scenario: Multi-channel voltage/current logging in oil-field SCADA nodes powered by Li-SOCl₂ batteries with 10-year field deployment. IC Role / Device Role / Timing Role: High-accuracy sensor interface for RTD, thermocouple, and strain gauge bridges requiring stable gain/offset over −40°C to +85°C. Use Value: ±0.3 ppm/°C gain drift and ±0.3 ppm/°C offset drift minimize recalibration frequency; MSOP-10 footprint enables compact, ruggedized PCB layout. |
| Handheld Spectrum Analyzer | Lab-Grade Digital Multimeter |
Use Scenario: Real-time FFT-based spectral analysis of RF harmonics up to 200 kHz using undersampling techniques in battery-operated field test equipment. IC Role / Device Role / Timing Role: High-speed acquisition engine capturing transient events with 400 ns acquisition time and 2.5 ns aperture delay. Use Value: 9 MHz −3 dB input bandwidth and −110 dB THD support clean harmonic detection; daisy-chain mode enables synchronized multi-channel capture. |
Use Scenario: 6½-digit DMM front-end digitizing DC/AC voltage, resistance, and continuity with auto-ranging and self-calibration routines. IC Role / Device Role / Timing Role: Precision reference-stabilized converter providing traceable measurements against internal 5 V reference with <0.003% FSR linearity. Use Value: No missing codes and ±0.6 LSB typical INL guarantee monotonic response across full scale - essential for metrological confidence and NIST-traceable calibration. |
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 |
|---|---|---|---|
| AD7685CRMZRL7 | Same 10-lead MSOP package, identical pinout, but rated for 250 kSPS max throughput and 91 dB SINAD (20 kHz). | Lower speed and SNR make it suitable for cost-sensitive, sub-300 kSPS instrumentation where power is less constrained. | Select AD7685CRMZRL7 only if 500 kSPS is unnecessary and BOM cost reduction is prioritized over dynamic performance. |
| AD7688BCPZRL7 | 10-lead LFCSP package (3 mm × 3 mm), same 500 kSPS rating, but specified for −40°C to +125°C industrial temp range and 90 dB SINAD. | Higher temperature grade and slightly lower AC performance suit automotive or harsh-environment sensor modules. | Choose AD7688BCPZRL7 when extended temperature operation is required and MSOP footprint is not mandatory. |
Compared with AD7686CRMZRL7, AD7685CRMZRL7 trades speed and SNR for lower cost in static measurement roles, while AD7688BCPZRL7 extends operational temperature at minor AC performance expense - neither is pin-compatible with AD7686CRMZRL7's MSOP-10 mechanical form factor.
Availability
AD7686CRMZRL7 is available at Aetrix Electronics and suitable for portable medical devices, industrial data loggers, handheld test equipment, and lab-grade instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7686CRMZRL7 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 design centers worldwide and ISO 9001-certified manufacturing.
The AD7686CRMZRL7 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered specifically for low-power, high-accuracy data acquisition in battery-operated and space-constrained instrumentation systems.
FAQ
What is the maximum recommended reference voltage for AD7686CRMZRL7?
The AD7686CRMZRL7 supports an external reference voltage (REF) from 0.5 V up to VDD. Since AD7686CRMZRL7 operates with VDD = 4.5 V to 5.5 V, the maximum REF is 5.5 V. However, typical operation uses VREF = VDD = 5 V to achieve full 16-bit dynamic range and specified AC performance (e.g., 92.5 dB SINAD). Exceeding VDD risks violating absolute maximum ratings.
Does AD7686CRMZRL7 require an external driver amplifier for all input configurations?
No - AD7686CRMZRL7 can be driven directly by low-impedance sources (<100 Ω), as its analog input presents a 600 Ω series resistance and 30 pF capacitance during acquisition. However, for high-impedance sensors (e.g., piezoelectric transducers or thermocouples), an external driver like ADA4941 is recommended to maintain THD < −110 dB and prevent settling errors. The datasheet specifies driver selection based on source impedance and signal bandwidth.
Can AD7686CRMZRL7 operate with a 3.3 V digital interface while using a 5 V analog supply?
Yes - AD7686CRMZRL7 features separate VIO and VDD supplies. Set VDD = 5 V for analog performance and VIO = 3.3 V for digital interface compatibility. This configures VIH = 2.31 V min and VOL = 0.4 V max, ensuring robust logic-level translation with 3.3 V microcontrollers without level shifters. All timing parameters remain valid per Table 4 for VIO ≥ 2.3 V.
Is the exposed pad on AD7686CRMZRL7 electrically functional or just for thermal relief?
The exposed pad on AD7686CRMZRL7 must be connected to GND per datasheet Figure 5 and Table 6 Note 1. While not strictly required to meet electrical specifications, grounding the pad improves thermal dissipation (θJC = 44°C/W) and reduces noise coupling - especially critical in high-resolution measurements. Leaving it floating may degrade PSRR and increase susceptibility to EMI in sensitive analog layouts.
How does the daisy-chain mode function in AD7686CRMZRL7, and what is the timing overhead?
In daisy-chain mode (enabled by pulling SDI low at CNV rising edge), multiple AD7686CRMZRL7 devices share one SDO line. Each device shifts out its 16-bit result sequentially, with a fixed 16-cycle delay between outputs. For N ADCs, total readout requires N × 16 SCK cycles. The first bit of the first device appears tEN (15 ns min) after CNV rise, and subsequent bits follow each SCK falling edge - enabling synchronized sampling across channels without additional control lines.
AD7686CRMZRL7 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:
- -
AD7686CRMZRL7 FAQ
1.How can I place an order for AD7686CRMZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7686CRMZRL7 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 AD7686CRMZRL7 reliable?
The price and inventory of AD7686CRMZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7686CRMZRL7 is usually 5 days.
3.What payment methods are accepted for AD7686CRMZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7686CRMZRL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7686CRMZRL7?
AD7686CRMZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7686CRMZRL7 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 AD7686CRMZRL7?
For technical support, including AD7686CRMZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7686CRMZRL7 requirements.
6.How does Aetrix verify that AD7686CRMZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7686CRMZRL7 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 AD7686CRMZRL7 meets industry standards.
7.What is the process for return or replacement of AD7686CRMZRL7?
All AD7686CRMZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7686CRMZRL7, 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 AD7686CRMZRL7 part is unused and in its original packaging.
Return procedure for AD7686CRMZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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