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Analog Devices Inc. AD7661ACPZ
- Part No.:
- AD7661ACPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-VFQFN Exposed Pad, CSP
- Datasheet:
-
AD7661ACPZ.pdf
- Description:
- IC ADC 16BIT SAR 48LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,671
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Product details
Overview
AD7661ACPZ from Analog Devices is a 16-bit, 100 kSPS unipolar successive approximation register (SAR) analog-to-digital converter with integrated 2.5 V reference, ±2.5 LSB INL, and parallel/serial (SPI/MICROWIRE/DSP-compatible) 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 AD7661ACPZ datasheet, AD7661ACPZ pinout, AD7661ACPZ application, or AD7661ACPZ equivalent, key selection considerations include its guaranteed no-missing-codes performance, internal reference drift (±15 ppm/°C max), 10 µs conversion time, dual 48-lead LQFP/LFCSP package options, and hardware factory calibration for ac/dc parameters.
Technical Context
The AD7661ACPZ implements a charge redistribution SAR architecture with on-chip error correction circuitry, eliminating pipeline delay and enabling immediate data availability post-conversion. Its internal 2.5 V reference features typical 3 ppm/°C drift and supports external reference input via REFBUFIN.
It supports both parallel (16-bit, 5 V/3 V tolerant) and serial (master/slave SPI-compatible) interfaces, with configurable clocking (internal/external SCLK), SYNC polarity (INVSYNC), and data format (straight binary/twos complement via OB/2C). Power-down modes reduce consumption to 160 µW at 1 kSPS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - ensures full dynamic range utilization without code gaps in precision measurement systems. |
| Throughput Rate | 100 kSPS - enables real-time sampling of signals up to ~40 kHz Nyquist bandwidth for spectrum analysis and DSP applications. |
| INL | ±2.5 LSB max - corresponds to ±0.0038% of full scale (0–2.5 V range), critical for high-fidelity medical waveform digitization. |
| S/(N+D) | 88 dB min @ 20 kHz - provides >14.5 ENOB, supporting accurate low-noise signal capture in instrumentation front-ends. |
| Reference Drift | ±15 ppm/°C max - guarantees stable 2.5 V reference over –40°C to +85°C, minimizing gain error drift in portable equipment. |
| Aperture Jitter | 5 ps rms - limits sampling uncertainty, preserving SNR in high-frequency AC-coupled measurements. |
| Power Dissipation | 40 mW typ with REF - balances precision and efficiency for battery-powered systems requiring long runtime and stable accuracy. |
Pinout & Package
The AD7661ACPZ is available in a 48-lead LFCSP (Lead Frame Chip Scale Package) with exposed pad, optimized for thermal performance and compact PCB layout in space-constrained instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Analog Input | Unipolar 0 V to 2.5 V input node; requires clean analog ground (INGND) and decoupling for optimal THD/SNR. |
| REF / REFGND | Reference Output / Reference Ground | Provides buffered 2.5 V reference; REFGND must be isolated from AGND/DGND to prevent noise coupling into ADC core. |
| CNVST | Conversion Start | Falling-edge-triggered control; determines sampling instant-critical for low-jitter timing in synchronized acquisition systems. |
| BUSY | Conversion Status | Active-HIGH open-drain output signaling conversion progress; falling edge indicates valid data ready for read. |
| SER/PAR | Interface Mode Select | HIGH = serial mode (SDOUT/SCLK/SYNC); LOW = parallel mode (D[15:0]); configures pin multiplexing at power-up. |
| PDREF / PDBUF | Reference Power Control | PDREF LOW enables internal reference; PDBUF LOW enables internal buffer-both required for buffered 2.5 V operation. |
| D[15:0] | Data Output Bus | 16-bit parallel output; BYTEWAP controls MSB/LSB byte ordering to match host processor endianness requirements. |
| CS / RD | Chip Select / Read Strobe | Active-LOW enable pair-must both be asserted to drive D[15:0] or SDOUT; supports standard microprocessor bus interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after BUSY goes LOW-enables deterministic latency in closed-loop control and real-time DSP. |
| Hardware factory calibration | Guarantees ac specs (SNR, THD) and dc specs (gain, offset, linearity) across temperature without user calibration overhead. |
| Single 5 V supply operation | Eliminates need for dual ±5 V rails-reduces BOM count and simplifies power design in portable and embedded systems. |
| Both AC and DC specifications | Validated performance across frequency domain (20 kHz SFDR = 96 dB) and static domain (INL = ±2.5 LSB)-supports mixed-signal test equipment. |
| Temperature sensor output | TEMP pin provides 300 mV @ 25°C with 1 mV/°C sensitivity-enables on-chip thermal monitoring without external sensors. |
Applications
| Medical Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Digitizing ECG, EEG, or pressure transducer outputs in portable patient monitors. IC Role / Device Role / Timing Role: Precision front-end ADC capturing low-amplitude, low-frequency biopotentials with minimal quantization and harmonic distortion. Use Value: ±2.5 LSB INL and 88 dB S/(N+D) ensure diagnostic-grade fidelity; 160 µW standby power extends battery life in handheld units. | Use Scenario: High-channel-count industrial DAQ modules acquiring sensor data from strain gauges, RTDs, and thermocouples. IC Role / Device Role / Timing Role: Standalone 16-bit sampling node with internal reference, reducing system-level calibration complexity. Use Value: Hardware-calibrated dc accuracy eliminates per-unit trim; 100 kSPS throughput supports multi-channel interleaved sampling at >10 kSPS/channel. |
| Spectrum Analysis Equipment | Battery-Powered Test Instruments |
Use Scenario: Real-time FFT-based spectral monitoring in handheld RF analyzers or audio analyzers. IC Role / Device Role / Timing Role: High-SFDR ADC feeding FPGA-based digital downconverters with deterministic 10 µs conversion latency. Use Value: 96 dB SFDR at 20 kHz and 5 ps aperture jitter preserve signal integrity for accurate harmonic and intermodulation analysis. | Use Scenario: Field-deployable multimeters and oscilloscope probes requiring precision, low power, and wide temperature operation. IC Role / Device Role / Timing Role: Core digitizer with integrated reference and temperature sensing for self-compensating measurements. Use Value: Internal 2.5 V reference (±15 ppm/°C) and TEMP pin enable auto-calibration routines-improving accuracy stability across –40°C to +85°C operating range. |
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 | Same 48-lead LFCSP package, identical pinout, but 16-bit resolution with 100 kSPS and no internal reference (requires external 2.5 V source). | Requires external reference design and calibration; lower cost where reference stability is managed externally. | Select AD7660ACPZ when system already provides a high-precision external reference and board space allows separate reference IC placement. |
| ADS8325IPW | 16-bit, 100 kSPS SAR ADC in 28-pin TSSOP; includes internal 2.4 V reference (±25 ppm/°C), SPI-only interface, no parallel port. | Lacks parallel interface and temperature sensor; higher reference drift reduces accuracy over temperature vs. AD7661ACPZ. | Choose ADS8325IPW for space-constrained designs prioritizing minimal footprint and SPI simplicity over multi-interface flexibility and thermal monitoring. |
Compared with AD7660ACPZ, the AD7661ACPZ adds integrated reference and temperature sensing-reducing component count and improving system-level accuracy stability. Against ADS8325IPW, it offers parallel interface support, lower reference drift, and on-chip thermal diagnostics-making it preferable for high-reliability instrumentation where design margin and feature completeness matter.
Availability
AD7661ACPZ is available at Aetrix Electronics and suitable for medical instrumentation, industrial data acquisition, spectrum analysis equipment, and battery-powered test instruments requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7661ACPZ 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, serving precision instrumentation, industrial automation, and healthcare markets.
The AD7661ACPZ belongs to the PulSAR® family of precision SAR ADCs, designed specifically for applications demanding high resolution, excellent ac/dc accuracy, and flexible digital interfacing without pipeline latency.
FAQ
What is the maximum operating temperature range for the AD7661ACPZ?
The AD7661ACPZ is specified for operation from –40°C to +85°C ambient temperature. This range applies to both the 48-lead LQFP and 48-lead LFCSP packages. The device includes an on-chip temperature sensor (TEMP pin) that outputs 300 mV at 25°C with 1 mV/°C sensitivity, enabling system-level thermal compensation. Full dc and ac performance-including ±2.5 LSB INL and 88 dB S/(N+D)-is guaranteed across this entire range.
Does the AD7661ACPZ require external reference components?
No-the AD7661ACPZ integrates a 2.5 V internal reference with ±15 ppm/°C max temperature drift and supports direct use via the REF and REFGND pins. However, it also accepts external references (2.3 V to AVDD – 1.85 V) through REFBUFIN when PDREF is HIGH. Using the internal reference eliminates external components and simplifies layout; external reference mode is reserved for systems requiring tighter drift specs or different voltage levels.
How does the AD7661ACPZ handle power-down modes?
Two dedicated inputs control power states: PDREF and PDBUF manage reference subsystem power, while the PD pin controls overall ADC core power-down. When PD is HIGH, conversions halt after completion and power drops to 160 µW at 1 kSPS (without reference). With PDREF and PDBUF HIGH, the internal reference and buffer are disabled-reducing total dissipation. All configurations retain register state and require no reinitialization upon wake-up.
Can the AD7661ACPZ interface directly with 3 V microcontrollers?
Yes-the AD7661ACPZ supports mixed-voltage operation: OVDD can be set to 2.7 V–5.25 V, enabling direct connection to 3 V logic families. Its digital I/Os (CS, RD, SER/PAR, etc.) accept 3 V–5 V compatible thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and the parallel bus outputs swing rail-to-rail relative to OVDD. In serial mode, SDOUT, SCLK, and SYNC are fully compatible with 3 V SPI peripherals without level-shifting.
What is the significance of the BYTESWAP pin on the AD7661ACPZ?
The BYTESWAP pin configures byte ordering on the 16-bit parallel interface: when LOW, D[7:0] carries the LSB and D[15:8] the MSB; when HIGH, the mapping reverses. This allows seamless alignment with host processor endianness (little-endian vs. big-endian) without software bit manipulation. It directly affects how firmware reads D[15:0]-critical for deterministic data handling in real-time embedded applications using the AD7661ACPZ.
AD7661ACPZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 48-VFQFN Exposed Pad, CSP
- Packaging:
- Tray
- 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:
- -
AD7661ACPZ FAQ
1.How can I place an order for AD7661ACPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7661ACPZ 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 AD7661ACPZ reliable?
The price and inventory of AD7661ACPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7661ACPZ is usually 5 days.
3.What payment methods are accepted for AD7661ACPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7661ACPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7661ACPZ?
AD7661ACPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7661ACPZ 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 AD7661ACPZ?
For technical support, including AD7661ACPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7661ACPZ requirements.
6.How does Aetrix verify that AD7661ACPZ is sourced from the original manufacturer or authorized distributors?
All AD7661ACPZ 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 AD7661ACPZ meets industry standards.
7.What is the process for return or replacement of AD7661ACPZ?
All AD7661ACPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7661ACPZ, 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 AD7661ACPZ part is unused and in its original packaging.
Return procedure for AD7661ACPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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