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Analog Devices Inc. AD7661ACPZRL
- Part No.:
- AD7661ACPZRL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-VFQFN Exposed Pad, CSP
- Datasheet:
-
AD7661ACPZRL.pdf
- Description:
- IC ADC 16BIT SAR 48LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,173
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Product details
Overview
AD7661ACPZRL from Analog Devices is a 16-bit, 100 kSPS unipolar PulSAR® successive-approximation register (SAR) analog-to-digital converter with integrated 2.5 V reference, ±2.5 LSB INL, and parallel/serial 3 V/5 V interface. It operates from a single 5 V supply, delivers 88 dB S/(N+D) at 20 kHz, and targets precision data acquisition in medical instruments and battery-powered instrumentation.
For engineers reviewing the AD7661ACPZRL datasheet, AD7661ACPZRL pinout, AD7661ACPZRL application, or AD7661ACPZRL equivalent, this page provides verified specifications, functional pin mapping, real-world use scenarios, and validated alternative options for high-accuracy DC/AC signal digitization in embedded industrial and portable systems.
Technical Context
The AD7661ACPZRL implements a charge redistribution SAR architecture with factory-calibrated error correction, eliminating pipeline delay and ensuring no missing codes across its 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 external reference configurations via PDREF and PDBUF control pins.
It supports dual digital interfaces: an 16-bit parallel port with BYTEWAP and OB/2C configuration, and a flexible SPI-/QSPI-/MICROWIRE-compatible serial port with master/slave modes, programmable clock division (DIVSCLK), and active-low/high SYNC polarity selection via INVSYNC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with guaranteed no missing codes - ensures full dynamic range utilization without code gaps. |
| Throughput Rate | 100 kSPS maximum - enables real-time capture of signals up to ~40 kHz Nyquist bandwidth. |
| INL | ±2.5 LSB max (±0.0038% FS) - supports high-precision DC measurements and low-distortion AC analysis. |
| S/(N+D) | 88 dB min at 20 kHz - delivers >14.5 ENOB for clean spectral representation in spectrum analysis. |
| Reference Voltage | 2.5 V internal, ±3 ppm/°C typical drift - reduces system BOM count and improves temperature stability vs. external references. |
| Power Dissipation | 16 mW typ at 100 kSPS without REF; 40 mW typ with REF - enables low-power operation in battery-powered systems. |
| Analog Input Range | 0 V to 2.5 V unipolar - simplifies front-end design for grounded-signal sources like sensors and transducers. |
Pinout & Package
AD7661ACPZRL is housed in a 48-lead LFCSP (Lead Frame Chip Scale Package) with exposed thermal pad, rated for –40°C to +85°C operation. The package supports fine-pitch PCB layout and enhanced thermal performance versus LQFP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Analog input | Primary unipolar input node (0 V to 2.5 V); requires dedicated AGND return (INGND) for optimal CMRR. |
| REF / REFGND | Reference output / reference ground | Provides 2.5 V reference voltage; REFGND must be isolated from AGND/DGND to minimize noise coupling. |
| CNVST | Conversion start trigger | Falling-edge–sensitive control; determines aperture timing and sampling jitter-critical for coherent sampling. |
| BUSY | Conversion status indicator | Active-HIGH signal indicates conversion in progress; falling edge marks data readiness for readout. |
| SER/PAR | Interface mode select | HIGH = serial mode (D8–D11 repurposed as SDOUT/SCLK/SYNC/RDERROR); LOW = parallel mode. |
| PDREF / PDBUF | Reference power control | PDREF LOW enables internal reference; PDBUF LOW enables internal buffer-both required for buffered 2.5 V output. |
| D[0:15] | Data bus | 16-bit parallel output in SER/PAR = LOW mode; D8–D11 become serial I/O when SER/PAR = HIGH. |
| CS / RD | Chip select / read strobe | Both must be LOW to enable data output; supports standard microprocessor bus timing with minimal glue logic. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after BUSY goes LOW-enables deterministic latency-critical control loops. |
| Internal 2.5 V reference | 3 ppm/°C typical drift and 15 ppm/°C max over –40°C to +85°C-reduces calibration burden in field-deployed equipment. |
| Parallel + serial interface | Single device supports both 16-bit parallel (8/16-bit byte order configurable) and SPI-compatible serial-simplifies migration between MCU platforms. |
| Temperature sensor output | TEMP pin provides 300 mV @ 25°C with 1 mV/°C slope-enables on-chip thermal monitoring without external components. |
| Low-power scaling | 160 µW consumption at 1 kSPS-supports ultra-low-duty-cycle wake-up sampling in energy-harvesting applications. |
Applications
| Medical Instrumentation | Digital Signal Processing |
|---|---|
Use Scenario: High-fidelity acquisition of ECG, EEG, or pressure transducer signals in portable diagnostic devices. IC Role / Device Role / Timing Role: Primary ADC capturing low-amplitude, low-frequency biomedical waveforms with <1 µV offset stability and minimal harmonic distortion. Use Value: ±2.5 LSB INL and 88 dB S/(N+D) ensure accurate amplitude and phase reconstruction for clinical-grade analysis. | Use Scenario: Real-time spectral analysis of vibration or acoustic signals in predictive maintenance edge nodes. IC Role / Device Role / Timing Role: Front-end digitizer feeding FPGA or DSP with synchronized 100 kSPS samples and no pipeline latency. Use Value: 820 kHz –3 dB input bandwidth and 5 ps rms aperture jitter preserve signal integrity for FFT-based feature extraction. |
| Battery-Powered Data Loggers | Process Control Monitoring |
Use Scenario: Long-duration environmental sensing (temperature, humidity, gas concentration) powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Low-power ADC operating in burst mode with automatic power-down between conversions. Use Value: 160 µW at 1 kSPS and integrated temperature sensor (TEMP) reduce system-level power and component count. | Use Scenario: Precision measurement of 4–20 mA loop outputs or RTD bridge voltages in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Isolated, calibrated ADC stage interfacing with precision op-amp signal conditioning circuitry. Use Value: 0 V to 2.5 V input range matches common DAC/reference rails; ±0.08% FSR full-scale error ensures traceable metrology-grade accuracy. |
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 |
|---|---|---|---|
| AD7660ACPZRL | Same 48-lead LFCSP package and pinout; lower 50 kSPS throughput; 2.5 V reference only (no external REFBUFIN option). | Targeted at cost-sensitive, lower-speed applications where 100 kSPS is not required. | Select AD7660ACPZRL if throughput ≤50 kSPS suffices and external reference flexibility is unnecessary. |
| AD7664BCPZRL | 18-bit resolution, 250 kSPS, same PulSAR family; requires 5 V AVDD/DVDD but adds OVDD-independent serial interface. | Used where higher resolution or faster sampling is needed, e.g., high-end test equipment or wideband communications. | Choose AD7664BCPZRL when >16-bit ENOB or >100 kSPS is mandatory-accepts larger PCB footprint and higher power. |
Compared with AD7661ACPZRL, AD7660ACPZRL trades speed for cost and simplicity, while AD7664BCPZRL extends resolution and rate at increased complexity and power-making AD7661ACPZRL the optimal balance for 16-bit, 100 kSPS, reference-integrated precision acquisition.
Availability
AD7661ACPZRL is available at Aetrix Electronics and suitable for medical instrumentation, battery-powered data loggers, and process control monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7661ACPZRL 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.
The AD7661ACPZRL belongs to the PulSAR® family of precision SAR ADCs designed for high-accuracy, low-latency, single-supply data acquisition in portable, industrial, and medical systems.
FAQ
What is the maximum sampling rate supported by the AD7661ACPZRL?
The AD7661ACPZRL supports a maximum throughput rate of 100 kSPS, corresponding to a minimum conversion cycle time of 10 µs. This is achievable in both parallel and serial interface modes, with no pipeline delay-ensuring deterministic timing for real-time control applications. The AD7661ACPZRL maintains full 16-bit accuracy and specified AC performance (e.g., 88 dB S/(N+D)) at this rate.
Does the AD7661ACPZRL require an external reference voltage?
No, the AD7661ACPZRL includes a factory-trimmed 2.5 V internal reference with ±3 ppm/°C typical temperature drift. External reference operation is optional and enabled by pulling PDREF HIGH and applying 2.3 V to AVDD – 1.85 V at REFBUFIN. The AD7661ACPZRL's internal reference eliminates BOM cost and board space in most precision applications.
How does the AD7661ACPZRL handle power management in low-duty-cycle systems?
The AD7661ACPZRL supports two dedicated power-down controls: PDREF and PDBUF for reference section, and PD pin for full device shutdown. At 1 kSPS, power dissipation drops to 160 µW without reference-ideal for battery-powered systems. The AD7661ACPZRL exits power-down in <5 ms and retains calibration, enabling rapid wake-up sampling without recalibration overhead.
Can the AD7661ACPZRL interface directly with 3 V microcontrollers?
Yes, the AD7661ACPZRL's OVDD supply accepts 2.7 V to 5.25 V and powers the digital I/O interface independently. When OVDD = 3 V, all digital inputs (CS, RD, CNVST, etc.) accept 3 V logic levels, and outputs (D[0:15], BUSY, SYNC, etc.) swing rail-to-rail within 3 V margins-enabling seamless interoperability with 3 V MCUs without level shifters.
What is the function of the TEMP pin on the AD7661ACPZRL?
TEMP is an analog output pin providing a voltage proportional to die temperature: 300 mV at 25°C with 1 mV/°C sensitivity. It is internally buffered and requires no external components. This allows the AD7661ACPZRL to serve as a local thermal monitor-useful for compensating gain/offset drift or triggering thermal throttling in compact systems.
AD7661ACPZRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 48-VFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI, Parallel, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-LFCSP-VQ (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7661ACPZRL FAQ
1.How can I place an order for AD7661ACPZRL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7661ACPZRL 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 AD7661ACPZRL reliable?
The price and inventory of AD7661ACPZRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7661ACPZRL is usually 5 days.
3.What payment methods are accepted for AD7661ACPZRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7661ACPZRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7661ACPZRL?
AD7661ACPZRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7661ACPZRL 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 AD7661ACPZRL?
For technical support, including AD7661ACPZRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7661ACPZRL requirements.
6.How does Aetrix verify that AD7661ACPZRL is sourced from the original manufacturer or authorized distributors?
All AD7661ACPZRL 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 AD7661ACPZRL meets industry standards.
7.What is the process for return or replacement of AD7661ACPZRL?
All AD7661ACPZRL units undergo pre-shipment inspection (PSI). If there is an issue with AD7661ACPZRL, 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 AD7661ACPZRL part is unused and in its original packaging.
Return procedure for AD7661ACPZRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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