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Analog Devices Inc. AD7685BCPZRL7
- Part No.:
- AD7685BCPZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
AD7685BCPZRL7.pdf
- Description:
- IC ADC 16BIT SAR 10LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,091
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Product details
Overview
AD7685BCPZRL7 from Analog Devices is a 16-bit, pseudo-differential, successive-approximation analog-to-digital converter (ADC) with 250 kSPS throughput, ±2 LSB integral nonlinearity, 93.5 dB SINAD at 20 kHz, and no pipeline delay-designed for high-precision data acquisition in battery-powered medical instruments and portable instrumentation.
For engineers reviewing the AD7685BCPZRL7 datasheet, AD7685BCPZRL7 pinout, AD7685BCPZRL7 application, or AD7685BCPZRL7 equivalent, this page delivers verified electrical specifications, MSOP-10 pin mapping, real-world timing behavior across 2.3–5.5 V supply, and validated alternatives for low-power 16-bit SAR ADC selection.
Technical Context
The AD7685BCPZRL7 employs a charge redistribution capacitive DAC architecture with integrated track-and-hold, enabling true 16-bit resolution without missing codes and zero latency conversion. Its CNV-triggered sampling captures IN+ relative to IN− over 0 V to VREF, supporting external reference voltages up to VDD.
It features a SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface with daisy-chain capability and optional BUSY indicator, powered by dual supplies: VDD (2.3–5.5 V) for analog core and VIO (1.8–VDD+0.3 V) for logic compatibility with 1.8 V/2.5 V/3 V/5 V hosts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes-guarantees monotonicity and full code coverage for precision measurement systems. |
| Throughput | 250 kSPS at VDD = 4.5–5.5 V-supports real-time signal capture in portable oscilloscopes and sensor interfaces. |
| INL | ±2 LSB max (±0.003% FSR)-enables accurate DC calibration and multi-channel system linearity matching. |
| SINAD | 93.5 dB at 20 kHz, VREF = 5 V-delivers >15.5 ENOB for high-fidelity audio and vibration analysis. |
| Power @ 100 kSPS | 1.35 mW at 2.5 V-enables >10-year battery life in 100-SPS sleep-wake cycles for remote monitoring nodes. |
| Aperture Delay | 2.5 ns at VDD = 5 V-minimizes sampling uncertainty in wideband signal reconstruction. |
| Reference Range | 0.5 V to VDD-allows flexible scaling from low-voltage sensors to full-supply-rail inputs without external buffers. |
Pinout & Package
AD7685BCPZRL7 is housed in a 10-lead MSOP package (3 mm × 3 mm, 0.5 mm pitch), RoHS-compliant, with exposed pad connected to GND (not required for electrical performance).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF | Analog reference input | Accepts 0.5 V to VDD; must be decoupled with 10 µF capacitor-sets full-scale range and directly impacts gain accuracy. |
| VDD | Analog power supply | 2.3–5.5 V single supply powers internal DAC, comparator, and track-and-hold-determines dynamic range and noise floor. |
| IN+ | Pseudo-differential analog input | Input voltage measured relative to IN−; supports 0 V to VREF range-ideal for single-ended sources with ground-referenced sensing. |
| IN− | Analog ground sense | Provides remote ground reference point; connects to analog ground plane-rejects common-mode noise in noisy environments. |
| GND | Power ground | Common return for VDD and analog circuitry-requires low-impedance connection to minimize offset drift. |
| CNV | Convert control input | Rising edge initiates conversion and selects interface mode (CS or chain); doubles as chip select in CS mode-defines timing critical path. |
| SDO | Serial data output | 16-bit straight-binary result synchronized to SCK falling edge-drives 50 pF load with 5 ns hold time at 2.3 V VIO. |
| SCK | Serial clock input | Drives data shift-out; minimum period 15 ns at VIO > 4.5 V-enables >66 MHz interface clock for fast readout. |
| SDI | Serial data input | Selects CS vs. chain mode on CNV rising edge; enables daisy-chaining or BUSY signaling-eliminates need for additional GPIOs. |
| VIO | Digital I/O supply | 1.8–VDD+0.3 V independent rail-ensures logic compatibility with mixed-voltage microcontrollers and FPGAs. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Conversion result available immediately after tCONV (≤2.2 µs), enabling deterministic timing in closed-loop control. |
| Ultra-low standby current | 1 nA at 25°C-reduces quiescent drain in always-on sensor nodes and extends shelf life of sealed devices. |
| Wide VIO range | Supports 1.8 V, 2.5 V, 3 V, and 5 V logic families without level shifters-simplifies integration with modern low-voltage SoCs. |
| Daisy-chain capability | Multiple AD7685BCPZRL7 units share one SDO line using SDI as data-in-cuts PCB routing complexity and reduces host SPI peripheral count. |
| Pin-for-pin compatibility | Interchangeable with AD7686, AD7687, and AD7688-enables scalable design reuse across 16-bit PulSAR® family variants. |
Applications
| Portable Medical Monitoring | 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 zero-latency conversion for real-time arrhythmia detection. Use Value: 93.5 dB SINAD ensures clean baseline separation; 1.35 mW power at 100 kSPS extends runtime without thermal derating. |
Use Scenario: Environmental sensor node logging temperature, humidity, and pressure every 10 seconds in remote field deployments. IC Role / Device Role / Timing Role: Low-power SAR ADC triggered by microcontroller wake-up interrupt, acquiring 16-bit samples before returning to 1 nA standby. Use Value: Standby current <1 nA eliminates battery self-discharge concerns; MSOP-10 footprint minimizes board area in compact enclosures. |
| Industrial Process Control Sensors | Handheld Test Equipment |
Use Scenario: 4–20 mA loop-powered transmitter measuring flow or pressure with HART digital overlay. IC Role / Device Role / Timing Role: High-linearity ADC converting conditioned sensor output with ±2 LSB INL to maintain 0.1% system accuracy over temperature. Use Value: ±0.3 ppm/°C gain drift and ±0.3 ppm/°C offset drift ensure calibration stability across −40°C to +85°C industrial operating range. |
Use Scenario: Portable multimeter or oscilloscope probe interface requiring high-resolution DC and AC measurements. IC Role / Device Role / Timing Role: Precision front-end ADC supporting both DC voltage measurement (low-noise, high-INL accuracy) and AC spectral analysis (93.5 dB SINAD). Use Value: Pseudo-differential input rejects common-mode noise from switching power supplies; 2.5 ns aperture delay enables accurate time-domain sampling. |
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 PulSAR® architecture, but rated for 500 kSPS and uses LFCSP-10 package-higher speed, smaller footprint, identical pinout. | Preferred where higher throughput or space-constrained layouts are required; not drop-in due to different thermal pad requirements. | Select AD7687BRMZ when >250 kSPS sampling or tighter board area budgets drive design-verify thermal management for LFCSP. |
| ADS8860IDRCT | Texas Instruments 16-bit SAR ADC with 1 MSPS throughput, SPI interface, and 1.8 V–3.6 V supply-lower power at high speed but narrower VREF range (0.5–3.6 V). | Better suited for ultra-low-voltage embedded systems; lacks daisy-chain support and has lower INL (±3.5 LSB max). | Choose ADS8860IDRCT for battery-operated IoT endpoints needing 1 MSPS with 1.8 V logic-accept trade-off in linearity and interface flexibility. |
Compared with AD7685BCPZRL7, AD7687BRMZ offers higher speed in same form factor while ADS8860IDRCT provides superior energy efficiency per sample at the cost of reduced DC accuracy and missing daisy-chain capability-selection depends on whether throughput, power, or system-level interface simplicity is dominant.
Availability
AD7685BCPZRL7 is available at Aetrix Electronics and suitable for portable medical monitoring, battery-powered data loggers, and industrial process control sensors requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AD7685BCPZRL7 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, serving industrial, automotive, communications, and healthcare markets.
The AD7685BCPZRL7 belongs to the PulSAR® family of precision SAR ADCs-designed specifically for applications demanding high resolution, low power, and zero-latency conversion in space- and energy-constrained systems.
FAQ
What is the maximum recommended reference voltage for AD7685BCPZRL7?
The AD7685BCPZRL7 supports an external reference voltage (REF) from 0.5 V up to VDD. When VDD = 5.5 V, REF may be set to 5.5 V; however, typical operation uses VREF = VDD = 5 V or 2.5 V. Exceeding VDD on REF violates absolute maximum ratings and risks permanent damage. The AD7685BCPZRL7 datasheet specifies REF ≤ VDD under all conditions.
Does AD7685BCPZRL7 support true differential input mode?
No, AD7685BCPZRL7 implements pseudo-differential input architecture: IN+ is sampled relative to IN−, but IN− serves only as a ground sense reference-not an active complementary input. It does not accept inverted differential signals like true differential ADCs (e.g., AD7689). The AD7685BCPZRL7 input range is defined as 0 V to VREF between IN+ and IN−, with IN− tied to analog ground or remote sense point.
Can AD7685BCPZRL7 operate with a 1.8 V digital interface while using a 5 V analog supply?
Yes, AD7685BCPZRL7 supports independent supplies: VDD = 5 V powers the analog core, while VIO = 1.8 V powers the digital interface. This configuration is explicitly validated in the datasheet's timing tables (Table 4 and Table 5) and allows seamless interfacing with 1.8 V microcontrollers without level shifters. The AD7685BCPZRL7 maintains full 250 kSPS throughput and 93.5 dB SINAD under this mixed-supply condition.
What is the minimum acquisition time required for full 16-bit accuracy in AD7685BCPZRL7?
The AD7685BCPZRL7 requires a minimum acquisition time (tACQ) of 1.8 µs, as specified in Tables 4 and 5 across all supply and temperature conditions. This value is fixed and independent of throughput-it ensures the internal sampling capacitor fully settles to within ½ LSB of final value. Shorter acquisition times risk DNL degradation and missing codes; the AD7685BCPZRL7 does not support programmable acquisition windows.
Is AD7685BCPZRL7 pin-compatible with other PulSAR® ADCs in MSOP-10 packages?
Yes, AD7685BCPZRL7 is pin-for-pin compatible with AD7686, AD7687, and AD7688 in the MSOP-10 package, as confirmed in the General Description and Pin Configuration sections of the AD7685 datasheet. This allows direct substitution within the same footprint for design scalability-though users must verify timing, power, and reference requirements match the target variant's specifications before replacement.
AD7685BCPZRL7 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:
- -
AD7685BCPZRL7 FAQ
1.How can I place an order for AD7685BCPZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7685BCPZRL7 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 AD7685BCPZRL7 reliable?
The price and inventory of AD7685BCPZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7685BCPZRL7 is usually 5 days.
3.What payment methods are accepted for AD7685BCPZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7685BCPZRL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7685BCPZRL7?
AD7685BCPZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7685BCPZRL7 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 AD7685BCPZRL7?
For technical support, including AD7685BCPZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7685BCPZRL7 requirements.
6.How does Aetrix verify that AD7685BCPZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7685BCPZRL7 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 AD7685BCPZRL7 meets industry standards.
7.What is the process for return or replacement of AD7685BCPZRL7?
All AD7685BCPZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7685BCPZRL7, 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 AD7685BCPZRL7 part is unused and in its original packaging.
Return procedure for AD7685BCPZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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