My Inquiry
My Account
Analog Devices Inc. AD7686CRMZ
- Part No.:
- AD7686CRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7686CRMZ.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:173
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7686CRMZ from Analog Devices is a 16-bit, 500 kSPS pseudo-differential successive approximation ADC operating from a single 5 V supply with ±2 LSB INL, 92.5 dB SINAD at 20 kHz, and no pipeline delay-designed for high-precision data acquisition in battery-powered instrumentation and medical instruments.
For engineers reviewing the AD7686CRMZ datasheet, AD7686CRMZ pinout, AD7686CRMZ application, or AD7686CRMZ equivalent, this page delivers 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 interface differences.
Technical Context
The AD7686CRMZ employs a charge redistribution SAR architecture with on-chip track-and-hold, enabling true 16-bit accuracy without missing codes and eliminating latency in multiplexed channel systems. Its conversion is initiated by the CNV rising edge, sampling IN+ relative to IN− across 0 V to VREF (up to 5 V), with reference decoupling via a mandatory 10 µF capacitor at the REF pin.
It supports SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interfaces in CS or daisy-chain modes, with programmable busy indication and 1.8 V–5 V logic compatibility via dedicated VIO supply. Power dissipation scales linearly with throughput: 3.75 µW at 100 SPS, 15–21.5 mW at 500 kSPS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes-guarantees monotonicity and full code coverage over temperature. |
| Throughput | 500 kSPS maximum-supports real-time sampling of signals up to 9 MHz input bandwidth. |
| INL | ±2 LSB max (±0.003% FSR)-ensures accurate end-point linearity for calibration-critical applications. |
| SINAD | 92.5 dB at 20 kHz (5 V ref)-enables >15.3 ENOB for high-fidelity sensor signal digitization. |
| Supply | Single 4.5–5.5 V VDD + independent 1.8–5 V VIO-allows interfacing with low-voltage microcontrollers without level shifters. |
| Power @ 500 kSPS | 15–21.5 mW-balances speed and efficiency for portable, thermally constrained designs. |
| Standby Current | 1 nA typical-extends battery life in sleep-mode data loggers and wireless sensors. |
Pinout & Package
AD7686CRMZ is housed in a 10-lead MSOP package (3 mm × 3 mm, 0.85 mm height) with exposed pad connected to GND for thermal stability. 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 (max 5.5 V); requires local 10 µF ceramic decoupling for noise immunity and stability. |
| 2 VDD | Analog power supply | 4.5–5.5 V single supply powering core ADC and internal track-and-hold; shares ground with GND (Pin 5). |
| 3 IN+ | Pseudo-differential analog input (+) | Input voltage range: 0 V to VREF referenced to IN−; supports unipolar signals with remote ground sensing. |
| 4 IN− | Analog input ground sense (−) | Connects to remote analog ground plane to reject common-mode noise and eliminate ground loop errors. |
| 5 GND | Power supply ground | Common return for VDD, REF, and digital supplies; must be tied to exposed pad for thermal performance. |
| 6 CNV | Convert trigger / interface mode select | Rising edge initiates conversion; logic level at CNV rising edge selects CS or daisy-chain mode. |
| 7 SDO | Serial data output | 16-bit straight-binary output synchronized to SCK falling edge; tri-stated 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; high enables CS mode; also used for busy indicator enable. |
| 10 VIO | Digital I/O power supply | 1.8–5 V supply setting logic thresholds; isolates digital interface from analog supply noise. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate availability of conversion result after tCONV (≤1.6 µs), enabling deterministic timing in closed-loop control. |
| Daisy-chain capability | Multiple AD7686CRMZ devices share one SDO line using SDI as data-in, reducing PCB routing and host GPIO count. |
| 1.8 V–5 V logic interface | VIO pin allows direct connection to modern low-voltage MCUs (e.g., ARM Cortex-M0+) without external level translators. |
| Ultra-low standby current | 1 nA typical shutdown current enables multi-year battery operation in intermittent-sampling IoT nodes. |
| Pseudo-differential input | IN+/IN− architecture rejects common-mode noise up to 70 dB at 100 kHz, improving SNR in noisy industrial environments. |
Applications
| Portable Medical Diagnostics | Industrial Process Monitoring |
|---|---|
Use Scenario: Battery-powered ECG front-end acquiring low-amplitude biopotential signals in handheld patient monitors. IC Role / Device Role / Timing Role: Primary ADC capturing differential electrode inputs with 16-bit resolution and <1.6 µs conversion time per sample. Use Value: 92.5 dB SINAD preserves diagnostic fidelity; 1 nA standby current extends single-battery operation to >3 years in sleep-wake cycles. |
Use Scenario: PLC analog input module measuring 4–20 mA current loops and thermocouple outputs in factory automation. IC Role / Device Role / Timing Role: High-accuracy SAR ADC with remote IN− sensing to eliminate ground potential errors across distributed I/O racks. Use Value: ±2 LSB INL ensures traceable calibration; 500 kSPS throughput supports oversampling for noise reduction in harsh EMI environments. |
| High-Channel-Count DAQ Systems | Test & Measurement Equipment |
Use Scenario: 16-channel benchtop data logger multiplexing multiple sensors (strain gauges, RTDs) into a single ADC. IC Role / Device Role / Timing Role: Pin-compatible SAR ADC enabling compact layout with daisy-chained serial interface to reduce FPGA resource usage. Use Value: No pipeline delay allows immediate post-conversion processing; MSOP-10 footprint minimizes board area vs. larger alternatives. |
Use Scenario: Portable oscilloscope or spectrum analyzer requiring high dynamic range for low-level RF signal analysis. IC Role / Device Role / Timing Role: Precision ADC digitizing conditioned IF signals with minimal harmonic distortion and 92.5 dB SINAD at 20 kHz. Use Value: −110 dB THD prevents spurious artifacts in FFT-based measurements; 9 MHz input bandwidth supports wideband capture. |
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 |
|---|---|---|---|
| AD7685CRMZ | Same 10-lead MSOP package and pinout; lower throughput (250 kSPS) and reduced AC performance (89 dB SINAD). | Better suited for cost-sensitive, lower-speed applications where 500 kSPS is unnecessary. | Select AD7685CRMZ only if system sampling rate ≤250 kSPS and SINAD ≥89 dB suffices. |
| AD7687BRMZ | Pin-compatible 10-lead MSOP; higher throughput (500 kSPS) but wider INL (±3 LSB max) and no guaranteed no-missing-codes spec. | Acceptable for non-critical measurement where absolute linearity is secondary to speed. | Choose AD7687BRMZ only when prioritizing raw speed over guaranteed monotonicity and ±2 LSB INL. |
Compared with AD7685CRMZ and AD7687BRMZ, the AD7686CRMZ uniquely delivers 500 kSPS throughput *with* ±2 LSB INL and no missing codes-making it the only option among the three that satisfies both high-speed and metrology-grade linearity requirements simultaneously.
Availability
AD7686CRMZ is available at Aetrix Electronics and suitable for battery-powered equipment, medical instruments, industrial process controls, and portable instrumentation requiring stable component supply across extended product lifecycles.
Supply support for AD7686CRMZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide.
The AD7686CRMZ belongs to the PulSAR® family of precision SAR ADCs-engineered specifically for applications demanding high resolution, low power, and zero-latency conversion in space-constrained, battery-operated, or thermally sensitive systems.
FAQ
What is the maximum recommended reference voltage for AD7686CRMZ?
The AD7686CRMZ supports an external reference voltage from 0.5 V to VDD, with VDD rated 4.5–5.5 V. Therefore, the maximum recommended reference voltage is 5.5 V. However, Analog Devices specifies optimal AC performance (e.g., 92.5 dB SINAD) at VREF = 5 V with VDD = 5 V. Exceeding 5 V on REF may degrade noise performance and is not characterized in the datasheet.
Does AD7686CRMZ require an external driver amplifier for all applications?
No-the AD7686CRMZ integrates a low-noise, wide-bandwidth track-and-hold circuit and can be driven directly by low-impedance sources (<100 Ω). However, for high-impedance sensors (e.g., piezoelectric transducers) or when driving long traces, an external amplifier like the ADA4941 is recommended to maintain THD and settling performance, as specified in the "Driver Amplifier Choice" section of the AD7686CRMZ datasheet.
Can AD7686CRMZ operate with VIO = 1.8 V while VDD = 5 V?
Yes-AD7686CRMZ explicitly supports independent VIO supply from 1.8 V to VDD + 0.3 V. With VDD = 5 V, VIO = 1.8 V is fully compliant and enables direct interfacing with 1.8 V logic families. Digital input thresholds scale accordingly (VIH = 0.7 × VIO ≈ 1.26 V), and timing parameters adjust (e.g., minimum SCK period increases to 20 ns).
Is the exposed pad on AD7686CRMZ electrically required to be grounded?
Yes-the exposed pad on the AD7686CRMZ MSOP package must be connected to GND per the datasheet (Figure 6, Note 1). While electrical performance is maintained without this connection, grounding the pad is mandatory for thermal reliability and to meet the specified θJA = 200°C/W. Failure to connect it risks junction temperature exceedance under sustained 500 kSPS operation.
How does the daisy-chain mode function on AD7686CRMZ?
In daisy-chain mode (enabled by pulling SDI low at the CNV rising edge), multiple AD7686CRMZ devices share one SDO line. Each device shifts its 16-bit result onto SDO with a 16-SCK-cycle delay relative to the previous device. The host reads all results sequentially on a single data line, reducing interconnect complexity and FPGA pin count-ideal for high-channel-count systems.
AD7686CRMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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:
- -
AD7686CRMZ FAQ
1.How can I place an order for AD7686CRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7686CRMZ 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 AD7686CRMZ reliable?
The price and inventory of AD7686CRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7686CRMZ is usually 5 days.
3.What payment methods are accepted for AD7686CRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7686CRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7686CRMZ?
AD7686CRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7686CRMZ 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 AD7686CRMZ?
For technical support, including AD7686CRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7686CRMZ requirements.
6.How does Aetrix verify that AD7686CRMZ is sourced from the original manufacturer or authorized distributors?
All AD7686CRMZ 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 AD7686CRMZ meets industry standards.
7.What is the process for return or replacement of AD7686CRMZ?
All AD7686CRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7686CRMZ, 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 AD7686CRMZ part is unused and in its original packaging.
Return procedure for AD7686CRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7686CRMZ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
