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Analog Devices Inc. AD7661ACPRL
- Part No.:
- AD7661ACPRL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-VFQFN Exposed Pad, CSP
- Datasheet:
-
AD7661ACPRL.pdf
- Description:
- IC ADC 16BIT W/REF 48-LFCSP T/R
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
AD7661ACPRL from Analog Devices is a 16-bit, 100 kSPS unipolar PulSAR® successive approximation register (SAR) ADC with integrated 2.5 V reference, ±2.5 LSB INL, 88 dB SNR at 20 kHz, and parallel/serial (SPI/QSPI/MICROWIRE/DSP-compatible) interface - used in precision data acquisition for medical instruments and spectrum analysis.
For engineers reviewing the AD7661ACPRL datasheet, AD7661ACPRL pinout, AD7661ACPRL application, or AD7661ACPRL equivalent, this page delivers verified technical context, real-world interface timing constraints, thermal drift behavior of its internal reference, and validated alternatives for high-accuracy DC/AC signal digitization in battery-powered and industrial instrumentation systems.
Technical Context
The AD7661ACPRL employs charge redistribution SAR architecture with factory-calibrated error correction, enabling no missing codes and no pipeline delay across its full 0 V to 2.5 V unipolar input range. Its internal 2.5 V reference exhibits ±3 ppm/°C typical drift and supports both buffered and unbuffered operation via PDREF/PDBUF control.
It operates from a single 5 V supply (AVDD = DVDD = 5 V), with separate OVDD (2.7–5.25 V) for I/O logic compatibility with 3 V or 5 V hosts. Conversion is initiated by CNVST edge-triggering, and BUSY output signals completion without latency - critical for deterministic sampling in real-time DSP and process control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full-scale code coverage for calibration-critical applications. |
| Throughput Rate | 100 kSPS maximum - enables sub-10 µs conversion cycle time (t7 = 1.25 µs) for high-speed transient capture. |
| INL | ±2.5 LSB max - corresponds to ±0.0038% FSR error, supporting <12-bit effective linearity in closed-loop feedback systems. |
| S/(N+D) | 88 dB min @ 20 kHz - delivers 14.3-bit ENOB for clean spectral analysis up to Nyquist (50 kHz). |
| Reference Drift | ±3 ppm/°C typical - ensures <±0.5 mV reference shift over –40°C to +85°C, reducing system-level recalibration frequency. |
| Power Dissipation | 16 mW typ @ 100 kSPS without REF; 40 mW typ with REF - supports low-power operation in portable medical devices. |
| Analog Input Range | 0 V to 2.5 V unipolar - simplifies front-end design by eliminating level-shifting for sensor outputs referenced to ground. |
Pinout & Package
AD7661ACPRL is packaged in a 48-lead LQFP (ST-48) with exposed pad, rated for –40°C to +85°C operation. Pinout matches AD7661 family specifications and supports both parallel (16-bit D[15:0]) and serial (SDOUT/SCLK/SYNC) configurations via SER/PAR selection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN / INGND | Analog input differential pair | Accepts 0 V to 2.5 V unipolar signal; INGND must be tied to AGND for accurate common-mode rejection. |
| REF / REFGND | Internal reference output | Provides 2.5 V ±0.02 V reference; REFGND is dedicated analog ground return for reference stability. |
| CNVST | Conversion start trigger | Falling-edge sensitive; initiates sample-to-hold transition with 2 ns aperture delay for low-jitter sampling. |
| BUSY | Conversion status indicator | Active-HIGH pulse lasting 1.25 µs - usable as hardware-ready signal for DMA or interrupt-driven readout. |
| SER/PAR | Interface mode select | LOW = parallel (D[15:0], RD, CS); HIGH = serial (SDOUT/SCLK/SYNC) - enables flexible host integration. |
| PDREF / PDBUF | Reference power control | PDREF LOW enables internal reference; PDBUF LOW enables internal buffer - allows external reference bypass or low-noise buffered mode. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after BUSY deassertion - eliminates latency-induced phase errors in real-time control loops. |
| Single 5 V supply operation | Eliminates dual-rail power design complexity while maintaining 88 dB AC performance - reduces BOM count and layout area. |
| Parallel and serial interface | Hardware-selectable mode supports legacy microprocessor buses (8/16-bit) and modern SPI-based controllers without glue logic. |
| Factory-calibrated ac/dc parameters | Guaranteed SNR, THD, INL, and DNL tested across temperature - removes need for system-level trimming in production test. |
| Temperature sensor output | TEMP pin provides 300 mV @ 25°C with 1 mV/°C slope - enables on-chip thermal monitoring for drift compensation algorithms. |
Applications
| Medical Instrumentation | Spectrum Analysis |
|---|---|
Use Scenario: Digitizing low-noise ECG/EEG front-end outputs in portable diagnostic devices. IC Role / Device Role / Timing Role: Precision unipolar ADC capturing 0–2.5 V biopotential signals at 100 kSPS with minimal harmonic distortion. Use Value: 88 dB S/(N+D) and –96 dB THD preserve waveform fidelity for arrhythmia detection algorithms. |
Use Scenario: High-resolution FFT-based spectral analysis in handheld RF analyzers. IC Role / Device Role / Timing Role: Low-jitter SAR ADC feeding FPGA-based DFT engines with deterministic BUSY-synchronized readout. Use Value: 14.3-bit ENOB and 820 kHz input bandwidth support accurate amplitude and phase measurement up to 400 kHz. |
| Data Acquisition Systems | Battery-Powered Test Equipment |
Use Scenario: Modular DAQ modules for industrial process monitoring with multi-sensor inputs. IC Role / Device Role / Timing Role: Central 16-bit converter interfacing to isolated analog front-ends via parallel bus under microcontroller control. Use Value: Pin-to-pin compatibility with AD7660 simplifies variant design; ±2.5 LSB INL ensures traceable calibration across channel banks. |
Use Scenario: Handheld multimeters and portable oscilloscopes requiring long battery life. IC Role / Device Role / Timing Role: Low-power ADC operating at 1 kSPS (160 µW) during standby, scaling to 100 kSPS only during active capture. Use Value: Dynamic power scaling and internal reference reduce external component count and quiescent current in compact enclosures. |
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 |
|---|---|---|---|
| AD7660ACPZ-REEL | Same 16-bit/100 kSPS PulSAR architecture but lacks internal reference - requires external 2.5 V reference source. | Used where reference flexibility or lower cost justifies added external components and board space. | Select when system already provides high-stability reference or when reference voltage must be programmable. |
| ADS8860IDRCT | 16-bit, 1 MSPS SAR ADC with 92 dB SNR, SPI-only interface, and no internal reference - higher speed but no parallel option. | Preferred in high-throughput embedded systems using modern MCUs with fast SPI peripherals and no legacy parallel bus. | Choose for >100 kSPS throughput needs and when PCB layout favors compact QFN over LQFP. |
Compared with AD7661ACPRL, AD7660ACPZ-REEL trades integrated reference for lower cost and design flexibility, while ADS8860IDRCT offers 10× faster sampling at the expense of parallel interface support and higher power - making AD7661ACPRL optimal for balanced precision, interface versatility, and thermal stability in mid-speed instrumentation.
Availability
AD7661ACPRL is available at Aetrix Electronics and suitable for medical instrumentation, spectrum analysis, and battery-powered test equipment requiring stable component supply, long-term lifecycle assurance, and guaranteed parametric compliance across –40°C to +85°C.
Supply support for AD7661ACPRL 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 R&D and manufacturing infrastructure spanning North America, Europe, and Asia.
The AD7661ACPRL belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered for high-resolution data acquisition in applications demanding low noise, excellent linearity, and robust thermal performance without external calibration.
FAQ
What is the operating temperature range for the AD7661ACPRL?
The AD7661ACPRL is specified for operation from –40°C to +85°C ambient temperature. All key parameters - including INL (±2.5 LSB), S/(N+D) (88 dB), and reference drift (±3 ppm/°C typical) - are guaranteed across this full industrial temperature range. The device uses a thermally optimized 48-lead LQFP package with exposed pad to maintain junction temperature within safe limits under continuous 100 kSPS operation.
Does the AD7661ACPRL require an external reference?
No, the AD7661ACPRL includes a factory-trimmed 2.5 V internal reference with ±3 ppm/°C typical temperature drift and 50 ppm hysteresis. External reference is optional: when PDREF is HIGH, the internal reference is disabled and REFBUFIN accepts 2.3 V to (AVDD – 1.85 V). This allows use of ultra-low-noise external references in metrology-grade systems while retaining pin compatibility.
How does the AD7661ACPRL handle power-down modes?
The AD7661ACPRL supports two independent power-down controls: PDREF disables the internal reference circuitry, reducing AVDD current by ~3 mA; PDBUF disables the reference buffer, saving additional current. When both are HIGH and no conversion is active, total power drops to 160 µW at 1 kSPS - ideal for battery-powered DAQ systems requiring periodic wake-up sampling.
Can the AD7661ACPRL interface directly with a 3 V microcontroller?
Yes. The AD7661ACPRL's OVDD pin accepts 2.7 V to 5.25 V, allowing direct connection to 3 V logic families. Its digital outputs (D[15:0], BUSY, RD, etc.) are OVDD-referenced and fully compatible with 3 V CMOS levels when OVDD = 3 V. SER/PAR, OB/2C, and BYTESWAP inputs accept 0.8 V/2.0 V thresholds, ensuring reliable operation with 3 V host I/O.
What is the significance of the TEMP pin on the AD7661ACPRL?
The TEMP pin on the AD7661ACPRL provides a calibrated analog voltage output (300 mV at 25°C, 1 mV/°C slope) proportional to die temperature. It enables real-time thermal monitoring for drift compensation in high-accuracy applications - for example, adjusting gain/offset coefficients in software based on measured junction temperature, improving system-level INL stability beyond datasheet limits.
AD7661ACPRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- 48-VFQFN Exposed Pad, CSP
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- 48-LFCSP-VQ (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7661ACPRL FAQ
1.How can I place an order for AD7661ACPRL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7661ACPRL 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 AD7661ACPRL reliable?
The price and inventory of AD7661ACPRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7661ACPRL is usually 5 days.
3.What payment methods are accepted for AD7661ACPRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7661ACPRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7661ACPRL?
AD7661ACPRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7661ACPRL 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 AD7661ACPRL?
For technical support, including AD7661ACPRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7661ACPRL requirements.
6.How does Aetrix verify that AD7661ACPRL is sourced from the original manufacturer or authorized distributors?
All AD7661ACPRL 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 AD7661ACPRL meets industry standards.
7.What is the process for return or replacement of AD7661ACPRL?
All AD7661ACPRL units undergo pre-shipment inspection (PSI). If there is an issue with AD7661ACPRL, 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 AD7661ACPRL part is unused and in its original packaging.
Return procedure for AD7661ACPRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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