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Analog Devices Inc. AD7666ASTZ
- Part No.:
- AD7666ASTZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
AD7666ASTZ.pdf
- Description:
- IC ADC 16BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,498
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Product details
Overview
AD7666ASTZ from Analog Devices is a 16-bit, 500 kSPS unipolar successive approximation register (SAR) analog-to-digital converter with integrated 2.5 V reference, ±2.0 LSB INL, and parallel/serial 3 V/5 V interface. It operates from a single 5 V supply, delivers 88 dB SNR at 20 kHz, and targets precision data acquisition in medical instruments and spectrum analysis systems.
For engineers reviewing the AD7666ASTZ datasheet, AD7666ASTZ pinout, AD7666ASTZ application, or AD7666ASTZ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated package mapping to LQFP-48, confirmed pin functions, and two field-tested alternative options for unipolar 16-bit SAR ADC migration paths.
Technical Context
The AD7666ASTZ implements a charge redistribution SAR architecture with factory-calibrated error correction, eliminating pipeline delay and supporting both AC and DC accuracy over –40°C to +85°C. Its internal 2.5 V reference exhibits ±3 ppm/°C typical drift and 500 kSPS throughput with 2 µs conversion cycle time.
It features dual interface modes: 16-bit parallel bus with BYTEWAP/OB/2C control, and SPI/QSPI/MICROWIRE-compatible serial port with configurable SYNC polarity, SCLK inversion, and master/slave timing-both operating across 2.7 V to 5.25 V OVDD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full-scale code coverage for high-fidelity signal capture. |
| Throughput Rate | 500 kSPS - enables real-time sampling of baseband signals up to 12 MHz bandwidth without aliasing. |
| INL | ±2.0 LSB max - ensures <0.0038% full-scale linearity error for accurate amplitude measurement in instrumentation. |
| S/(N+D) | 88 dB min @ 20 kHz - supports >14.3 ENOB for clean spectral analysis in digital signal processing applications. |
| Reference Voltage | 2.5 V ±7 mV @ 25°C - stable internal reference eliminates external component count and layout sensitivity. |
| Power Dissipation | 81 mW typ with REF - balances performance and thermal load in compact battery-powered or embedded systems. |
| Aperture Jitter | 5 ps rms - minimizes sampling uncertainty for high-frequency input signals requiring precise timing alignment. |
Pinout & Package
AD7666ASTZ is packaged in a 48-lead LQFP (ST-48) with exposed pad, pin-compatible with other PulSAR® ADCs. Thermal resistance θJA = 91°C/W supports operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN / INGND | Analog input pair | Unipolar 0 V to 2.5 V differential input path with 65 dB CMRR at 10 kHz - requires matched PCB routing for optimal noise rejection. |
| REF / REFGND | Reference output | 2.5 V buffered reference source with ±15 ppm/°C max drift - used directly for ADC conversion or as system reference for external circuitry. |
| CNVST | Conversion start trigger | Falling-edge–sensitive control that initiates hold-and-convert sequence - critical for low-jitter sampling in synchronized acquisition systems. |
| BUSY | Conversion status indicator | Active-HIGH open-drain output signaling conversion progress - falling edge serves as hardware-ready strobe for data latching. |
| SER/PAR | Interface mode select | Logic HIGH enables serial mode (SDOUT/SCLK/SYNC), LOW enables 16-bit parallel read - determines pin multiplexing and firmware driver complexity. |
| PDREF / PDBUF | Reference power control | PDREF LOW enables internal reference; PDBUF LOW enables internal buffer - allows dynamic power gating during idle periods to reduce quiescent current. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after BUSY goes LOW - eliminates latency-induced phase errors in closed-loop control or real-time feedback systems. |
| Internal 2.5 V reference | 3 ppm/°C typical drift - reduces calibration overhead and improves long-term stability in portable medical devices without external reference ICs. |
| Parallel + serial interface | Single 5 V supply supports both 3 V and 5 V logic levels - simplifies host MCU interfacing across legacy and modern microcontroller families. |
| Factory-calibrated ac/dc parameters | Guaranteed SNR, THD, gain, offset, and linearity - removes need for system-level trimming and accelerates time-to-test in production test environments. |
| Temperature sensor output | 300 mV @ 25°C, 1 mV/°C slope - enables on-chip thermal monitoring for derating or compensation algorithms without external sensors. |
Applications
| Data Acquisition Systems | Medical Instrumentation |
|---|---|
Use Scenario: High-channel-count industrial DAQ capturing vibration, pressure, and temperature signals at ≤500 kSPS per channel. IC Role / Device Role / Timing Role: Primary SAR ADC performing simultaneous sample-and-hold conversion with internal clock and reference - eliminates external timing synchronization components. Use Value: 16-bit resolution and 88 dB SNR enable detection of sub-millivolt transducer signals amid noisy plant-floor EMI. |
Use Scenario: Portable ECG monitor digitizing lead-II analog waveforms with baseline stability and low-power operation. IC Role / Device Role / Timing Role: Unipolar ADC converting conditioned biopotential signals using internal 2.5 V reference - avoids drift-prone external references in battery-constrained designs. Use Value: 500 kSPS throughput and 2 µs conversion cycle support oversampling for noise reduction while maintaining real-time display update rates. |
| Digital Signal Processing Front-End | Spectrum Analysis Equipment |
Use Scenario: FPGA-based real-time FFT engine analyzing audio or RF IF signals with minimal latency and deterministic timing. IC Role / Device Role / Timing Role: Low-jitter SAR ADC feeding parallel data bus directly to FPGA fabric - BUSY falling edge triggers synchronous data capture without software polling. Use Value: No pipeline delay and 5 ps aperture jitter preserve phase coherence across frequency bins in high-resolution spectral estimation. |
Use Scenario: Benchtop spectrum analyzer digitizing 0–12 MHz input bandwidth with calibrated amplitude accuracy. IC Role / Device Role / Timing Role: Precision ADC providing reference-grade linearity and SFDR >96 dB - forms the core of calibrated measurement chain traceable to NIST standards. Use Value: ±2.0 LSB INL and 88 dB S/(N+D) ensure amplitude fidelity within 0.004% full scale for pass/fail compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unipolar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7664ASTZ | Same 16-bit SAR architecture but 250 kSPS max throughput and 86 dB SNR - lower speed, slightly reduced dynamic range. | Preferred for cost-sensitive, lower-bandwidth applications like process control where 500 kSPS is unnecessary. | Select when system sampling rate ≤250 kSPS and board space allows same LQFP-48 footprint. |
| AD7656ASTZ | 6-channel simultaneous-sampling 16-bit SAR with 250 kSPS per channel - higher channel density but lower per-channel speed and no integrated reference. | Used in multi-sensor systems (e.g., motor drive current/voltage sensing) requiring phase-aligned acquisition across channels. | Choose when synchronized multi-channel acquisition is required and external reference design is acceptable. |
Compared with AD7666ASTZ, AD7664ASTZ trades 250 kSPS throughput and marginally lower SNR for lower power and cost, while AD7656ASTZ sacrifices per-channel speed and adds channel count and external reference dependency - making AD7666ASTZ optimal for single-channel, high-fidelity, self-contained 500 kSPS applications.
Availability
AD7666ASTZ is available at Aetrix Electronics and suitable for data acquisition, medical instrumentation, digital signal processing, and spectrum analysis requiring stable component supply, long-lifecycle assurance, and guaranteed parametric compliance.
Supply support for AD7666ASTZ 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 AD7666ASTZ belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for applications demanding high resolution, excellent ac/dc accuracy, and integrated reference stability without sacrificing speed or interface flexibility.
FAQ
What is the maximum sampling rate supported by the AD7666ASTZ?
The AD7666ASTZ supports a maximum throughput rate of 500 kSPS with a complete conversion cycle time of 2 µs. This is achievable across its full operating temperature range of –40°C to +85°C when powered from AVDD = DVDD = 5 V and OVDD = 2.7 V to 5.25 V. The AD7666ASTZ maintains specified INL, SNR, and THD performance at this rate, enabling real-time digitization of signals up to 12 MHz bandwidth.
Does the AD7666ASTZ require an external reference voltage?
No, the AD7666ASTZ includes a factory-trimmed 2.5 V internal reference with ±3 ppm/°C typical temperature drift and ±15 ppm/°C maximum drift. When PDREF is driven LOW, the internal reference is enabled and can be used directly for conversion. An external reference may be applied via REFBUFIN only if PDREF is held HIGH, but it is not required for standard operation of the AD7666ASTZ.
Which digital interfaces does the AD7666ASTZ support?
The AD7666ASTZ supports both parallel and serial digital interfaces. In parallel mode (SER/PAR = LOW), it outputs 16-bit data on D[0:15] with RD/CS handshaking. In serial mode (SER/PAR = HIGH), it operates as SPI/QSPI/MICROWIRE-compatible slave or master with SDOUT, SCLK, and SYNC signals - fully compatible with 3 V and 5 V logic families without level shifters.
What is the purpose of the TEMP pin on the AD7666ASTZ?
Pin 45 (TEMP) on the AD7666ASTZ provides an analog voltage output proportional to die temperature: 300 mV at 25°C with a sensitivity of 1 mV/°C. This output is internally generated and requires no external excitation. It enables real-time thermal monitoring for system-level compensation or safety shutdown logic without adding discrete temperature sensors - a feature unique to the AD7666ASTZ among its PulSAR® peers.
How does the AD7666ASTZ handle power-down functionality?
The AD7666ASTZ implements two independent power-down controls: PDREF and PDBUF. Driving PDREF HIGH disables the internal reference, reducing AVDD current by ~3 mA. Driving PDBUF HIGH disables the reference buffer amplifier. Both pins must be HIGH to achieve minimum 132 µW power dissipation at 1 kSPS. The PD pin provides global power-down, halting conversions and reducing total supply current to standby levels while preserving register state.
AD7666ASTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- 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-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7666ASTZ FAQ
1.How can I place an order for AD7666ASTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7666ASTZ 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 AD7666ASTZ reliable?
The price and inventory of AD7666ASTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7666ASTZ is usually 5 days.
3.What payment methods are accepted for AD7666ASTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7666ASTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7666ASTZ?
AD7666ASTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7666ASTZ 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 AD7666ASTZ?
For technical support, including AD7666ASTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7666ASTZ requirements.
6.How does Aetrix verify that AD7666ASTZ is sourced from the original manufacturer or authorized distributors?
All AD7666ASTZ 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 AD7666ASTZ meets industry standards.
7.What is the process for return or replacement of AD7666ASTZ?
All AD7666ASTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7666ASTZ, 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 AD7666ASTZ part is unused and in its original packaging.
Return procedure for AD7666ASTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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