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Analog Devices Inc. AD7685CRMZRL7
- Part No.:
- AD7685CRMZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7685CRMZRL7.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,693
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Product details
Overview
AD7685CRMZRL7 from Analog Devices is a 16-bit, pseudo-differential, successive-approximation ADC with 250 kSPS throughput, ±2 LSB max INL, 93.5 dB SINAD at 20 kHz, and single-supply operation from 2.3 V to 5.5 V. It features no pipeline delay, SPI-/QSPI™-/MICROWIRE™-/DSP-compatible serial interface, and operates in MSOP-10 package for precision data acquisition in space-constrained systems.
For engineers reviewing the AD7685CRMZRL7 datasheet, AD7685CRMZRL7 pinout, AD7685CRMZRL7 application, or AD7685CRMZRL7 equivalent, key selection considerations include its 10-lead MSOP footprint, 1.8 V–5 V logic interface via VIO, daisy-chain capability, 1 nA standby current, and compatibility with battery-powered medical and instrumentation systems requiring true 16-bit resolution without missing codes.
Technical Context
The AD7685CRMZRL7 employs a charge redistribution SAR architecture with integrated track-and-hold, enabling acquisition in 1.8 µs and conversion in ≤2.2 µs (VDD ≥4.5 V). Its pseudo-differential input accepts 0 V to VREF differential range referenced to IN−, supporting external reference voltages from 0.5 V to VDD.
Digital interface modes include CS-based 3-/4-wire and chain mode with BUSY indicator; all support 1.8 V–5 V logic levels via dedicated VIO supply. Power dissipation scales linearly with throughput-1.35 mW at 100 kSPS/2.5 V and 10 mW at 250 kSPS/5 V-enabling low-power and high-speed operation within the same device.
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 | 250 kSPS maximum (VDD ≥4.5 V)-supports real-time sampling of signals up to ~100 kHz Nyquist bandwidth. |
| INL | ±2 LSB maximum (±0.003% FSR)-ensures high absolute accuracy for calibrated measurement systems. |
| SINAD | 93.5 dB at 20 kHz (VREF = 5 V)-delivers >15.5 ENOB for high-fidelity signal capture in instrumentation. |
| Supply Range | VDD: 2.3 V–5.5 V; VIO: 1.8 V–VDD + 0.3 V-enables direct interfacing with 1.8 V, 2.5 V, 3.3 V, or 5 V host controllers. |
| Standby Current | 1 nA at 5 V/25°C-minimizes quiescent power in wake-on-event or duty-cycled battery applications. |
| Package | 10-lead MSOP (3 mm × 3 mm)-provides compact, surface-mountable footprint compatible with automated assembly. |
Pinout & Package
AD7685CRMZRL7 is housed in a 10-lead MSOP package (3 mm × 3 mm), RoHS-compliant, with exposed pad connected to GND (not required for electrical performance).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REF | Analog reference input | Accepts 0.5 V–VDD external reference; requires local 10 µF decoupling for stable conversion accuracy. |
| 2 VDD | Analog power supply | 2.3 V–5.5 V main supply; powers internal analog circuitry including track-and-hold and DAC array. |
| 3 IN+ | Pseudo-differential analog input (+) | Input voltage range: 0 V to VREF relative to IN−; high-impedance node during acquisition (1 nA leakage). |
| 4 IN− | Analog ground sense input | Reference point for IN+; connects to system analog ground or remote sense plane to reject common-mode noise. |
| 5 GND | Power ground | Common return for VDD and analog circuitry; must be low-impedance and separated from digital ground where possible. |
| 6 CNV | Convert control input | Rising edge initiates conversion and selects interface mode (CS vs. chain); doubles as chip select in CS mode. |
| 7 SDO | Serial data output | 16-bit straight-binary output synchronized to SCK; high-impedance when not selected or after tDIS (25 ns). |
| 8 SCK | Serial clock input | Drives data shift-out; minimum period 15 ns (VDD ≥4.5 V); timing varies with VIO voltage level. |
| 9 SDI | Serial data input | Configures interface mode on CNV rising edge (low = chain, high = CS); enables daisy-chaining in chain mode. |
| 10 VIO | Digital I/O power supply | 1.8 V–VDD + 0.3 V supply sets logic thresholds for SDI/SCK/SDO; isolates digital noise from analog section. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate availability of conversion result after tCONV (≤2.2 µs), eliminating latency in closed-loop control or multiplexed channel sequencing. |
| Proprietary SPI-compatible interface | Supports 3-wire CS mode, 4-wire CS mode, and daisy-chain mode with optional BUSY indicator-reduces GPIO count and simplifies multi-ADC synchronization. |
| Ultra-low standby current | 1 nA at 5 V/25°C enables multi-year battery life in intermittent-sampling applications such as portable diagnostics or environmental sensors. |
| Pseudo-differential input architecture | Rejects common-mode noise on IN− while accepting 0 V–VREF swing on IN+, simplifying front-end design versus fully differential ADCs. |
| Pin-for-pin compatibility | Direct replacement for AD7686/AD7687/AD7688 in same MSOP-10 footprint-enables scalable resolution/performance upgrades without PCB redesign. |
Applications
| Battery-Powered Medical Sensors | Portable Data Acquisition Systems |
|---|---|
|
Use Scenario: Continuous ECG or blood glucose monitoring in handheld diagnostic devices powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Primary analog-to-digital converter capturing conditioned biopotential signals at ≤250 kSPS with minimal power overhead. Use Value: 1 nA standby current and 1.35 mW active power at 100 kSPS extend operational life; 16-bit resolution supports clinical-grade dynamic range (>90 dB SNR). |
Use Scenario: Field-deployable vibration or temperature logging units with microcontroller-based control and flash storage. IC Role / Device Role / Timing Role: High-accuracy front-end ADC interfacing with op-amp sensor conditioning circuits and SPI-connected MCU. Use Value: No missing codes and ±2 LSB INL ensure reliable calibration traceability; daisy-chain mode allows multi-channel expansion using single SPI bus. |
| Industrial Process Monitoring | Mobile Communications Test Equipment |
|
Use Scenario: Loop-powered 4–20 mA transmitters or PLC analog input modules operating in harsh industrial environments. IC Role / Device Role / Timing Role: Precision digitizer for DC-coupled process variables (pressure, flow, level) with cold-junction compensation or RTD excitation. Use Value: −40°C to +85°C operating range and 65 dB analog input CMRR at 250 kHz suppress thermal drift and EMI in factory settings. |
Use Scenario: Portable RF signal analyzers or base station maintenance tools requiring fast, accurate IF or baseband sampling. IC Role / Device Role / Timing Role: Digitizer for intermediate frequency stages prior to digital downconversion in software-defined radio architectures. Use Value: 93.5 dB SINAD at 20 kHz and −110 dB THD enable clean spectral analysis; 2.5 ns aperture delay minimizes sampling jitter-induced noise floor degradation. |
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 |
|---|---|---|---|
| AD7687BRMZ | Same 10-lead MSOP package, 250 kSPS, but with true differential input (IN+/IN−) and higher 95.5 dB SINAD at 20 kHz. | Requires fully differential driver stage; better suited for high-EMI environments or bipolar input ranges. | Select AD7687BRMZ when true differential signaling and improved AC performance outweigh added front-end complexity. |
| ADS8860IDRCT | Texas Instruments 16-bit SAR ADC in 10-pin VSSOP; 1 MSPS throughput, 92 dB SINAD, 1.8 V–3.6 V supply only. | Higher speed but narrower supply range; lacks daisy-chain mode and has no BUSY indicator. | Choose ADS8860IDRCT for ultra-low-voltage, high-throughput applications where TI's ecosystem and 1 MSPS rate are prioritized over multi-ADC synchronization features. |
Compared with AD7685CRMZRL7, AD7687BRMZ offers superior AC specs and differential input at the cost of increased analog front-end design effort, while ADS8860IDRCT delivers higher sample rate in a pin-compatible VSSOP package but sacrifices flexibility in logic interface and power supply range.
Availability
AD7685CRMZRL7 is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable data acquisition systems, and industrial process monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7685CRMZRL7 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 operations worldwide.
The AD7685CRMZRL7 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for applications demanding high resolution, low power, and ease of digital interface integration in space- and energy-constrained systems.
FAQ
What is the maximum sampling rate of the AD7685CRMZRL7?
The AD7685CRMZRL7 achieves a maximum throughput of 250 kSPS when operated with VDD ≥4.5 V. At lower supplies (2.3 V–4.5 V), the rated maximum drops to 200 kSPS. This specification is guaranteed across the full −40°C to +85°C temperature range and reflects the time between consecutive CNV rising edges (tCYC = 4 µs minimum at VDD ≥4.5 V). The AD7685CRMZRL7 completes each conversion in ≤2.2 µs, enabling tight timing margins in deterministic real-time systems.
Does the AD7685CRMZRL7 require an external reference voltage?
Yes, the AD7685CRMZRL7 requires an external reference voltage applied to the REF pin. The REF input accepts voltages from 0.5 V up to VDD, and the analog input range is defined as 0 V to VREF differential between IN+ and IN−. The device does not include an internal reference; therefore, a stable, low-noise external reference (e.g., ADR45xx series) with appropriate decoupling (10 µF ceramic + 100 nF ceramic) is mandatory for specified INL and gain error performance. Reference load current is ≤50 µA at 250 kSPS.
Can the AD7685CRMZRL7 interface directly with a 1.8 V microcontroller?
Yes, the AD7685CRMZRL7 supports direct 1.8 V logic interfacing via its dedicated VIO supply pin. When VIO = 1.8 V, digital inputs (CNV, SDI, SCK) recognize VIH ≥1.26 V and VIL ≤0.54 V, and the SDO output drives VOH ≥1.5 V and VOL ≤0.4 V under 500 µA load. This independent I/O supply eliminates level-shifting components and ensures robust communication with low-voltage MCUs while maintaining analog section integrity through separate VDD and GND paths.
What package type is used for the AD7685CRMZRL7?
The AD7685CRMZRL7 is packaged in a 10-lead MSOP (Mini Small Outline Package) measuring 3 mm × 3 mm, with an exposed pad connected to GND. This package is RoHS-compliant, surface-mountable, and pin-for-pin compatible with other PulSAR® ADCs including AD7686, AD7687, and AD7688. The MSOP-10 footprint enables high-density PCB layouts while maintaining manufacturability in standard reflow processes.
How does the daisy-chain mode work on the AD7685CRMZRL7?
Daisy-chain mode on the AD7685CRMZRL7 is activated when SDI is held low during the CNV rising edge. In this mode, multiple AD7685CRMZRL7 devices share a single SDO line: the first ADC shifts out its 16-bit result, then passes the data from SDI through to SDO after 16 SCK cycles, allowing cascaded readout without additional chip-select lines. The BUSY indicator can be enabled optionally to signal conversion completion. This reduces SPI peripheral pin count and simplifies firmware for multi-channel systems.
AD7685CRMZRL7 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:
- 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:
- 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:
- -
AD7685CRMZRL7 FAQ
1.How can I place an order for AD7685CRMZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7685CRMZRL7 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 AD7685CRMZRL7 reliable?
The price and inventory of AD7685CRMZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7685CRMZRL7 is usually 5 days.
3.What payment methods are accepted for AD7685CRMZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7685CRMZRL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7685CRMZRL7?
AD7685CRMZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7685CRMZRL7 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 AD7685CRMZRL7?
For technical support, including AD7685CRMZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7685CRMZRL7 requirements.
6.How does Aetrix verify that AD7685CRMZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7685CRMZRL7 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 AD7685CRMZRL7 meets industry standards.
7.What is the process for return or replacement of AD7685CRMZRL7?
All AD7685CRMZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7685CRMZRL7, 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 AD7685CRMZRL7 part is unused and in its original packaging.
Return procedure for AD7685CRMZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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