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Analog Devices Inc. AD7685ARMZRL7
- Part No.:
- AD7685ARMZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7685ARMZRL7.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,555
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Product details
Overview
AD7685ARMZRL7 from Analog Devices is a 16-bit, 250 kSPS pseudo-differential successive approximation ADC in a 10-lead MSOP package. It operates from a single 2.3 V to 5.5 V supply with 1.8 V to 5 V logic interface, delivers ±2 LSB max INL and 93.5 dB SINAD at 20 kHz, and targets precision data acquisition in battery-powered medical instruments and portable instrumentation.
For engineers reviewing the AD7685ARMZRL7 datasheet, AD7685ARMZRL7 pinout, AD7685ARMZRL7 application, or AD7685ARMZRL7 equivalent, this page provides verified specifications, validated pin functions, confirmed packaging (MSOP-10), real-world use scenarios, and two technically documented alternative parts for design flexibility and supply continuity.
Technical Context
The AD7685ARMZRL7 uses a charge redistribution SAR architecture with integrated track-and-hold, delivering no pipeline delay and immediate conversion result availability. Its pseudo-differential input accepts 0 V to VREF across IN+ and IN−, where VREF is externally applied up to VDD, and supports reference voltages from 0.5 V to VDD + 0.3 V.
The serial interface is SPI-/QSPI™-/MICROWIRE™-/DSP-compatible with three operational modes: CS-mode (3- or 4-wire), chain-mode for daisy-chaining, and optional BUSY indicator. Power dissipation scales linearly with throughput-1.35 mW at 2.5 V/100 kSPS and 10 mW at 5 V/250 kSPS-with standby current as low as 1 nA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes-guarantees monotonicity and full code coverage over temperature. |
| Throughput | 250 kSPS at VDD = 4.5–5.5 V; 200 kSPS at VDD = 2.3–4.5 V-supports high-speed sampling without decimation. |
| INL | ±2 LSB maximum (±0.003% FSR)-enables accurate DC measurement and calibration-critical systems. |
| SINAD | 93.5 dB at 20 kHz, VREF = 5 V-supports >15.2 ENOB for high-fidelity signal capture in instrumentation. |
| Supply Range | VDD: 2.3 V to 5.5 V; VIO: 1.8 V to VDD + 0.3 V-allows direct interfacing with 1.8 V, 2.5 V, 3.3 V, or 5 V microcontrollers. |
| Power @ 100 kSPS | 1.35 mW at 2.5 V; 4 mW at 5 V-enables ultra-low-power operation in energy-constrained designs. |
| Aperture Delay | 2.5 ns at VDD = 5 V-minimizes sampling uncertainty for wideband analog inputs. |
Pinout & Package
AD7685ARMZRL7 is housed in a 10-lead MSOP (Mini Small Outline Package) with 0.5 mm pitch, 3 mm × 3 mm body, and exposed pad connected to GND (not required for electrical performance). Pin numbering follows standard MSOP top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Analog reference input | Accepts external 0.5 V to VDD reference; requires local 10 µF decoupling for stability. |
| 2 - VDD | Analog power supply | 2.3 V to 5.5 V single supply; powers internal circuitry and reference buffer. |
| 3 - IN+ | Pseudo-differential analog input (+) | Input range: 0 V to VREF relative to IN−; supports rail-to-rail input with respect to ground sense. |
| 4 - IN− | Analog input ground sense | Provides remote sensing point; connects to analog ground plane or sensor return path. |
| 5 - GND | Power ground | Common return for VDD, REF, and analog circuitry; must be low-impedance. |
| 6 - CNV | Convert control input | Rising edge initiates conversion and selects interface mode (CS or chain); doubles as chip select in CS mode. |
| 7 - SDO | Serial data output | 16-bit straight-binary output synchronized to SCK; tri-state when CNV/SDI high in CS mode. |
| 8 - SCK | Serial clock input | Drives data shift-out; timing varies by VIO level (15–40 ns period depending on voltage and mode). |
| 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. |
| 10 - VIO | Digital I/O power supply | Independent 1.8 V to 5 V supply sets logic thresholds; isolates digital noise from analog section. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Conversion result available immediately after tCONV (≤2.2 µs), enabling deterministic timing in multiplexed systems. |
| Daisy-chain capability | Supports multi-ADC configurations on single SDO line using SDI-driven chain mode-reduces PCB routing and host GPIO count. |
| Ultra-low standby current | 1 nA at 5 V/25°C-extends battery life in sleep-mode intervals between conversions. |
| Wide VIO compatibility | 1.8 V to 5 V logic interface allows direct connection to modern low-voltage MCUs without level-shifting. |
| Pin-for-pin compatibility | Interchangeable with AD7686, AD7687, and AD7688-enables scalable resolution/performance upgrades within same layout. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG or blood pressure waveform digitization in handheld diagnostic devices with 24-hour battery life. IC Role / Device Role / Timing Role: Primary analog front-end ADC capturing 16-bit biomedical signals at ≤250 kSPS with minimal latency and no missing codes. Use Value: Enables clinical-grade accuracy (±2 LSB INL) while consuming only 1.35 mW at 2.5 V/100 kSPS-extending runtime without compromising resolution. |
Use Scenario: Environmental monitoring node logging temperature, humidity, and gas concentration over weeks on coin-cell power. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated periodically via MCU wake-up; samples sensors then returns to 1 nA standby. Use Value: Achieves sub-µW average power via programmable throughput scaling and deep sleep-critical for unattended field deployments. |
| Industrial Process Transmitters | High-Accuracy Portable Test Equipment |
Use Scenario: 4–20 mA loop-powered field transmitter measuring pressure or flow with HART communication overlay. IC Role / Device Role / Timing Role: Precision ADC referenced to stable internal or external VREF, rejecting supply ripple and common-mode noise. Use Value: Delivers 93.5 dB SINAD and 65 dB analog CMRR at 250 kHz-ensuring metrology-grade readings despite harsh EMI environments. |
Use Scenario: Handheld oscilloscope or multimeter requiring fast, clean waveform capture with true 16-bit fidelity. IC Role / Device Role / Timing Role: High-speed sampling ADC with no pipeline delay, supporting real-time display and FFT-based analysis. Use Value: Provides 2.5 ns aperture delay and 2 MHz input bandwidth-preserving signal integrity for time-domain measurements up to ~300 kHz. |
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 16-bit true differential input (vs. pseudo-differential); higher THD (−106 dB vs. −110 dB). | Requires fully differential driver stage; better suited for noisy industrial transducers with balanced outputs. | Select AD7687BRMZ when true differential signaling is needed for improved CMRR and noise rejection. |
| AD7686BCPZ-RL7 | Same pinout, 400 kSPS throughput, 16-bit resolution, but higher power (6.5 mW at 5 V/400 kSPS) and wider VDD range (2.7–5.5 V). | Targets higher-speed acquisition with identical footprint-ideal for upgrade paths where sample rate is limiting. | Choose AD7686BCPZ-RL7 when system requires >250 kSPS without layout change or BOM revision. |
Compared with AD7685ARMZRL7, AD7687BRMZ adds true differential input capability at the cost of increased analog front-end complexity, while AD7686BCPZ-RL7 trades higher power for 60% greater throughput-both retain mechanical and logical compatibility for rapid evaluation and migration.
Availability
AD7685ARMZRL7 is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable test equipment, and industrial process transmitters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AD7685ARMZRL7 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 Wilmington, MA.
The AD7685ARMZRL7 belongs to the PulSAR® family of precision SAR ADCs designed for applications demanding high resolution, low power, and single-supply operation in space-constrained, battery-sensitive systems.
FAQ
What is the maximum recommended reference voltage for AD7685ARMZRL7?
The AD7685ARMZRL7 supports an external reference voltage (REF) from 0.5 V up to VDD + 0.3 V. When VDD = 5.5 V, REF may be as high as 5.8 V-but for optimal performance and to avoid exceeding absolute maximum ratings, REF should not exceed VDD. The datasheet specifies guaranteed operation with REF = VDD across the full temperature range.
Does AD1685ARMZRL7 support true differential input mode?
No, the AD7685ARMZRL7 implements a pseudo-differential input architecture: IN+ is sampled relative to IN−, which serves as a ground sense reference-not a complementary input. True differential operation (e.g., ±VREF swing) is not supported. For true differential input, consider the pin-compatible AD7687BRMZ.
Can AD7685ARMZRL7 operate with a 1.8 V digital interface while powered from 5 V analog supply?
Yes. AD7685ARMZRL7 features separate VIO and VDD supplies. With VDD = 5 V and VIO = 1.8 V, the digital interface meets 1.8 V logic thresholds (VIH ≥ 1.26 V, VIL ≤ 0.54 V), enabling direct connection to low-voltage FPGAs or microcontrollers without level shifters.
What is the minimum acquisition time required before conversion starts in AD7685ARMZRL7?
The AD7685ARMZRL7 requires a minimum acquisition time (tACQ) of 1.8 µs, as specified in Tables 4 and 5 of the datasheet. This value is constant across all VDD and VIO conditions and must be satisfied between the end of one conversion and the next CNV rising edge to ensure full 16-bit accuracy.
Is the exposed pad on the AD7685ARMZRL7 MSOP package required for thermal or electrical performance?
No. The exposed pad on the AD7685ARMZRL7 MSOP package is internally connected to GND but is explicitly noted in the datasheet as "not required to meet the electrical performances." While connecting it to PCB ground improves thermal dissipation and EMI immunity, electrical functionality-including INL, SINAD, and timing-is fully guaranteed without it.
AD7685ARMZRL7 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:
- -
AD7685ARMZRL7 FAQ
1.How can I place an order for AD7685ARMZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7685ARMZRL7 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 AD7685ARMZRL7 reliable?
The price and inventory of AD7685ARMZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7685ARMZRL7 is usually 5 days.
3.What payment methods are accepted for AD7685ARMZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7685ARMZRL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7685ARMZRL7?
AD7685ARMZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7685ARMZRL7 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 AD7685ARMZRL7?
For technical support, including AD7685ARMZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7685ARMZRL7 requirements.
6.How does Aetrix verify that AD7685ARMZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7685ARMZRL7 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 AD7685ARMZRL7 meets industry standards.
7.What is the process for return or replacement of AD7685ARMZRL7?
All AD7685ARMZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7685ARMZRL7, 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 AD7685ARMZRL7 part is unused and in its original packaging.
Return procedure for AD7685ARMZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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