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Analog Devices Inc. AD7685ACPZRL7
- Part No.:
- AD7685ACPZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
AD7685ACPZRL7.pdf
- Description:
- IC ADC 16BIT SAR 10LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:801
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Product details
Overview
AD7685ACPZRL7 from Analog Devices is a 16-bit, pseudo-differential, successive-approximation analog-to-digital converter (ADC) with 250 kSPS throughput, ±2 LSB max INL, 93.5 dB SINAD at 20 kHz, and no pipeline delay - designed for precision data acquisition in battery-powered medical instruments and portable instrumentation.
For engineers reviewing the AD7685ACPZRL7 datasheet, AD7685ACPZRL7 pinout, AD7685ACPZRL7 application, or AD7685ACPZRL7 equivalent, this page delivers verified electrical specs, MSOP-10 pin mapping, real-world use cases, and two validated alternative parts - all grounded in Analog Devices' Rev. D datasheet and official ordering guide.
Technical Context
The AD7685ACPZRL7 implements a charge redistribution SAR architecture with integrated track-and-hold, enabling true 16-bit resolution without missing codes and zero latency conversion. Its pseudo-differential input accepts 0 V to VREF on IN+ referenced to IN−, supporting external reference voltages up to VDD.
It features a proprietary SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface with daisy-chain capability and optional BUSY indicator, powered by dual supplies: VDD (2.3 V–5.5 V) and VIO (1.8 V–VDD + 0.3 V), allowing seamless interfacing with 1.8 V, 2.5 V, 3 V, or 5 V logic systems.
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 at VDD = 4.5–5.5 V - supports high-speed sampling in portable data loggers and real-time control loops. |
| INL | ±2 LSB maximum - ensures ≤0.003% FSR absolute linearity error for calibrated sensor signal chains. |
| SINAD | 93.5 dB at 20 kHz, VREF = 5 V - enables >15.5 ENOB for high-fidelity audio and vibration monitoring. |
| Power @ 100 kSPS | 1.35 mW at 2.5 V - allows continuous operation for >1 year on a single CR2032 coin cell in low-duty-cycle sensing. |
| Standby Current | 1 nA - facilitates ultra-low-power wake-on-event architectures in IoT edge nodes. |
| Analog Input Range | 0 V to VREF, VREF up to VDD - simplifies supply rail sharing and eliminates need for dedicated reference ICs. |
| Digital Interface | SPI/QSPI/MICROWIRE/DSP-compatible 3- or 4-wire serial - interoperates with ARM Cortex-M, TI C2000, and FPGA soft peripherals without level-shifting. |
Pinout & Package
AD7685ACPZRL7 is housed in a 10-lead MSOP package (3 mm × 3 mm, 0.5 mm pitch) with exposed pad connected to GND. Pinout matches industry-standard PulSAR® 10-lead footprint and is pin-for-pin compatible with AD7686/AD7687/AD7688.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Analog reference input | Accepts 0.5 V–VDD; must be decoupled with 10 µF capacitor for stable 16-bit accuracy. |
| 2 - VDD | Analog power supply | 2.3 V–5.5 V single supply powers core ADC and internal track-and-hold. |
| 3 - IN+ | Pseudo-differential analog input | Voltage measured relative to IN−; range = 0 V to VREF. |
| 4 - IN− | Analog ground sense | Provides remote sensing point for analog ground return; minimizes common-mode error. |
| 5 - GND | Power ground | Common return for VDD, REF, and digital I/O; exposed pad tied here for thermal and noise performance. |
| 6 - CNV | Convert trigger / interface mode select | Rising edge initiates conversion; SDI state at CNV edge selects CS or Chain mode. |
| 7 - SDO | Serial data output | 16-bit straight-binary result synchronized to SCK; high-impedance when not selected. |
| 8 - SCK | Serial clock input | Drives data shift-out; timing varies with VIO (17–20 ns min period at VIO ≥ 2.3 V). |
| 9 - SDI | Serial data input / mode control | Low at CNV edge enables daisy-chain; high enables CS-mode with optional BUSY indicator. |
| 10 - VIO | Digital I/O supply | 1.8 V–VDD + 0.3 V; sets logic thresholds independently of VDD for mixed-voltage systems. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after conversion completes - eliminates latency-induced phase errors in closed-loop control. |
| Single-supply operation | VDD = 2.3 V–5.5 V with independent VIO = 1.8 V–5 V - enables direct integration into 3.3 V or 1.8 V microcontroller subsystems. |
| Daisy-chain capability | SDI-driven multi-ADC chaining on one SDO line - reduces PCB routing complexity and GPIO count in multi-channel DAQ systems. |
| Ultra-low standby current | 1 nA at 5 V - extends battery life in always-on condition monitoring nodes without sacrificing wake-up responsiveness. |
| Wide reference voltage range | REF = 0.5 V–VDD - permits use of internal LDO outputs or low-noise bandgap references without external scaling. |
| −40°C to +85°C operation | Specified performance over industrial temperature range - suitable for deployment in field-deployable test equipment and process sensors. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG waveform digitization in handheld patient monitors with 24-hour battery life. IC Role / Device Role / Timing Role: Primary 16-bit ADC capturing differential lead signals at 250 kSPS with no missing codes and minimal power draw. Use Value: Achieves clinical-grade SNR (93.5 dB) while consuming only 1.35 mW at 2.5 V - enabling compact form factor and extended runtime without thermal derating. |
Use Scenario: Environmental parameter logging (temperature, humidity, pressure) in remote field stations powered by solar-charged Li-ion batteries. IC Role / Device Role / Timing Role: High-accuracy analog front-end ADC interfaced to low-power MCU via SPI, entering 1 nA standby between samples. Use Value: Delivers ±2 LSB INL and 90+ dB SINAD across −40°C to +85°C - ensuring traceable measurement integrity without calibration drift compensation. |
| Industrial Process Transmitters | Test & Measurement Front Ends |
Use Scenario: 4–20 mA loop-powered smart transmitters measuring flow, level, or valve position in hazardous-area instrumentation. IC Role / Device Role / Timing Role: Precision SAR ADC converting conditioned sensor outputs with pseudo-differential inputs rejecting common-mode noise on long cables. Use Value: 65 dB analog input CMRR at 250 kHz suppresses EMI from nearby VFDs or RF sources - maintaining signal fidelity in electrically noisy plants. |
Use Scenario: Modular benchtop oscilloscopes and spectrum analyzers requiring flexible sampling rates and high dynamic range. IC Role / Device Role / Timing Role: Core ADC in multi-channel acquisition modules, leveraging daisy-chain mode to synchronize sampling across 4–8 channels. Use Value: Supports 250 kSPS throughput with <2.2 µs conversion time and 1.8 µs acquisition - enabling real-time waveform reconstruction without interpolation artifacts. |
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 16-bit SAR architecture, 250 kSPS, but in MSOP-10 with different grade spec (B-grade INL ±1 LSB max); requires separate VREF source. | Optimized for lower-cost industrial DAQ where ±1 LSB INL suffices and external reference is already present. | Select AD7687BRMZ if system-level calibration budget allows tighter INL tolerance and reference sourcing is centralized. |
| AD7686BCPZ-RL7 | Pin-compatible 16-bit SAR ADC with identical MSOP-10 package and 250 kSPS, but higher power (2.5 mW @ 2.5 V/100 kSPS) and no 1 nA standby mode. | Suited for mains-powered instrumentation where power efficiency is secondary to robustness against fast transient interference. | Choose AD7686BCPZ-RL7 when operating in high-EMI environments requiring enhanced immunity and layout simplicity outweighs battery-life constraints. |
Compared with AD7685ACPZRL7, AD7687BRMZ offers better linearity at lower cost but lacks ultra-low standby current, while AD7686BCPZ-RL7 provides identical pinout and speed with higher noise immunity - making AD7685ACPZRL7 optimal for battery-constrained, high-accuracy portable systems.
Availability
AD7685ACPZRL7 is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable data loggers, and industrial process transmitters requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7685ACPZRL7 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.
The AD7685ACPZRL7 belongs to Analog Devices' PulSAR® family of precision SAR ADCs - engineered for high-resolution, low-power, and low-latency data acquisition in portable, medical, and industrial instrumentation.
FAQ
What is the maximum reference voltage supported by the AD7685ACPZRL7?
The AD7685ACPZRL7 supports an external reference voltage (REF) from 0.5 V up to VDD. When VDD = 5.5 V, REF may be as high as 5.5 V - enabling full-scale input ranges up to 5.5 V without external scaling resistors or level shifters. This simplifies design in systems where the ADC shares the main supply rail with other analog circuitry.
Does the AD7685ACPZRL7 require an external clock source?
No, the AD7685ACPZRL7 contains an internal conversion clock and requires only the external serial clock (SCK) for data readout. The CNV rising edge initiates conversion autonomously, and the internal timing ensures consistent 250 kSPS throughput without dependency on master clock stability - reducing system-level jitter sensitivity in the AD7685ACPZRL7 signal chain.
Can the AD7685ACPZRL7 operate with a 1.8 V digital interface while using a 5 V analog supply?
Yes. The AD7685ACPZRL7 separates analog (VDD) and digital I/O (VIO) supplies. With VDD = 5 V and VIO = 1.8 V, it fully complies with 1.8 V logic thresholds (VIL ≤ 0.3 × VIO, VIH ≥ 0.7 × VIO) while maintaining 16-bit analog performance - enabling direct interfacing to ultra-low-voltage MCUs without level translators in the AD7685ACPZRL7 design.
What is the aperture delay specification for the AD7685ACPZRL7?
The AD7685ACPZRL7 has a typical aperture delay of 2.5 ns at VDD = 5 V, defined as the time between the CNV rising edge and when the input signal is held for conversion. This sub-3 ns aperture uncertainty supports accurate sampling of signals up to ~100 MHz bandwidth - critical for preserving phase coherence in multi-channel synchronized acquisition using the AD7685ACPZRL7.
Is the AD7685ACPZRL7 pin-compatible with other PulSAR® ADCs?
Yes, the AD7685ACPZRL7 is pin-for-pin compatible with the AD7686, AD7687, and AD7688 in the 10-lead MSOP package. This allows drop-in replacement within the same footprint for design flexibility - for example, upgrading to AD7686BCPZ-RL7 for higher noise immunity or downgrading to AD7687BRMZ for cost-sensitive variants - all while retaining the same PCB layout for the AD7685ACPZRL7.
AD7685ACPZRL7 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):
- 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-LFCSP-WD (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7685ACPZRL7 FAQ
1.How can I place an order for AD7685ACPZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7685ACPZRL7 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 AD7685ACPZRL7 reliable?
The price and inventory of AD7685ACPZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7685ACPZRL7 is usually 5 days.
3.What payment methods are accepted for AD7685ACPZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7685ACPZRL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7685ACPZRL7?
AD7685ACPZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7685ACPZRL7 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 AD7685ACPZRL7?
For technical support, including AD7685ACPZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7685ACPZRL7 requirements.
6.How does Aetrix verify that AD7685ACPZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7685ACPZRL7 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 AD7685ACPZRL7 meets industry standards.
7.What is the process for return or replacement of AD7685ACPZRL7?
All AD7685ACPZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7685ACPZRL7, 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 AD7685ACPZRL7 part is unused and in its original packaging.
Return procedure for AD7685ACPZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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