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Analog Devices Inc. AD7666ASTZRL
- Part No.:
- AD7666ASTZRL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
AD7666ASTZRL.pdf
- Description:
- IC ADC 16BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,142
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Product details
Overview
AD7666ASTZRL 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 (SPI/QSPI/MICROWIRE/DSP-compatible) 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 AD7666ASTZRL datasheet, AD7666ASTZRL pinout, AD7666ASTZRL application, or AD7666ASTZRL equivalent, this page provides verified technical context, real-world interface timing constraints, confirmed package mapping to 48-lead LQFP, and validated alternative options for high-resolution, low-drift ADC selection in battery-powered and industrial instrumentation designs.
Technical Context
The AD7666ASTZRL implements a charge redistribution SAR architecture with factory-calibrated error correction circuitry, eliminating pipeline delay and ensuring immediate data availability post-conversion. Its internal 2.5 V reference exhibits ±3 ppm/°C typical drift and supports external reference input via REFBUFIN.
It features dual digital interface modes: 16-bit parallel bus with BYTEWAP/OB/2C control, and flexible serial operation supporting master/slave configurations, programmable clock division (DIVSCLK), and active-low/high SYNC polarity selection. All digital I/Os are compatible with both 3 V and 5 V logic levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full-scale code coverage for precision measurement. |
| Throughput Rate | 500 kSPS maximum - enables real-time capture of signals up to 12 MHz bandwidth (–3 dB point). |
| INL | ±2.0 LSB max - ensures <0.0038% full-scale linearity error for accurate DC and low-frequency signal digitization. |
| S/(N+D) | 88 dB min @ 20 kHz - delivers >14.3 ENOB for high-fidelity AC signal acquisition in spectral applications. |
| Reference Drift | ±3 ppm/°C typical - maintains <±0.5 LSB zero-error drift over –40°C to +85°C operating range. |
| Power Dissipation | 66 mW typ @ 500 kSPS without REF - supports thermally constrained battery-powered and portable instrumentation. |
| Analog Input Range | 0 V to 2.5 V unipolar - simplifies front-end design by eliminating level-shifting for grounded-sensor interfaces. |
Pinout & Package
AD7666ASTZRL is housed in a 48-lead LQFP (ST-48) package with exposed pad, rated for –40°C to +85°C operation. Pin 1 identifier located at top-left corner per JEDEC MO-220 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Analog Input | Main unipolar input node (0 V to 2.5 V range); requires dedicated AGND return path (INGND) for optimal noise rejection. |
| REF / REFGND | Reference Output / Ground | Provides buffered 2.5 V reference output; REFGND must be tied directly to AGND to minimize reference noise coupling. |
| CNVST | Conversion Start | Falling-edge-triggered sampling control; jitter as low as 5 ps rms enables precise timing-critical acquisition. |
| BUSY | Status Output | Active-HIGH open-drain signal indicating conversion in progress; falling edge serves as reliable data-ready strobe. |
| SER/PAR | Interface Mode Select | LOW = parallel mode (D[15:0], RD, CS); HIGH = serial mode (SDOUT/SCLK/SYNC), repurposing D[0:15] pins. |
| PDREF / PDBUF | Reference Power Control | PDREF LOW enables internal reference; PDBUF LOW activates internal buffer - both required for buffered 2.5 V reference use. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Conversion result available immediately after BUSY goes LOW - eliminates latency-induced phase errors in closed-loop control. |
| Internal 2.5 V reference | Guaranteed ±15 ppm/°C max drift - removes need for external precision reference in cost-sensitive portable designs. |
| Parallel + serial interface | Single device supports 16-bit parallel bus or SPI/QSPI-compatible 2-wire serial - reduces BOM count across multiple host platforms. |
| Temperature sensor output | TEMP pin provides 300 mV @ 25°C with 1 mV/°C sensitivity - enables on-chip thermal monitoring without external sensors. |
| Low power at low throughput | 132 µW @ 1 kSPS - extends battery life in intermittent-sampling applications such as environmental data loggers. |
Applications
| Medical Instrumentation | Spectrum Analysis |
|---|---|
|
Use Scenario: High-fidelity ECG/EEG signal digitization in portable diagnostic devices with limited power budget. IC Role / Device Role / Timing Role: Primary ADC capturing analog bio-potential waveforms at ≥500 SPS with <1 µV RMS noise floor. Use Value: 88 dB S/(N+D) and ±2.0 LSB INL ensure clinical-grade amplitude accuracy and waveform fidelity for arrhythmia detection. |
Use Scenario: Real-time FFT-based RF signal analysis in handheld spectrum analyzers with 12 MHz input bandwidth. IC Role / Device Role / Timing Role: Front-end digitizer sampling IF or baseband signals with minimal aperture jitter (5 ps rms). Use Value: 12 MHz –3 dB bandwidth and 96 dB SFDR enable clean spectral resolution of closely spaced tones in crowded RF environments. |
| Data Acquisition Systems | Battery-Powered Test Equipment |
|
Use Scenario: Modular DAQ modules for industrial process control requiring calibrated 16-bit resolution and traceable linearity. IC Role / Device Role / Timing Role: Precision measurement engine interfacing to isolated sensor bridges and RTDs via PGA stages. Use Value: Factory-calibrated gain/offset/linearity and guaranteed no-missing-codes eliminate field calibration overhead. |
Use Scenario: Handheld multimeters and insulation testers operating from AA/AAA cells with duty-cycled sampling. IC Role / Device Role / Timing Role: Low-power ADC enabling 1 kSPS burst-mode acquisition while maintaining sub-LSB zero drift. Use Value: 132 µW standby power and ±0.5 ppm/°C zero-error drift extend operational time and reduce thermal recalibration frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7665ASTZ | True bipolar input (±VREF), same 16-bit/500 kSPS spec, but lacks internal reference - requires external 2.5 V ref. | Required for differential or bipolar sensor interfaces (e.g., strain gauges with offset); not drop-in for unipolar-only designs. | Select AD7665ASTZ only when bipolar input range and external reference control are mandatory; AD7666ASTZRL saves BOM cost and layout area. |
| AD7664ASTZ | Same PulSAR family, pin-compatible 48-lead LQFP, but 16-bit/250 kSPS - half the throughput, identical INL/SNR specs. | Suitable for lower-bandwidth applications where 250 kSPS suffices; allows trade-off between speed and power (55 mW vs. 66 mW). | Choose AD7664ASTZ if system sampling rate ≤250 kSPS and power budget is tighter; AD7666ASTZRL is preferred for full 500 kSPS capability. |
Compared with AD7665ASTZ, AD7666ASTZRL offers integrated reference and unipolar optimization at full speed; compared with AD7664ASTZ, it doubles throughput while maintaining identical linearity and noise performance - making it the optimal choice for new 500 kSPS precision DAQ designs.
Availability
AD7666ASTZRL is available at Aetrix Electronics and suitable for medical instrumentation, spectrum analysis, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and guaranteed lot-to-lot parametric consistency.
Supply support for AD7666ASTZRL 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, with design centers worldwide.
The AD7666ASTZRL belongs to the PulSAR® family of precision SAR ADCs engineered for high-speed, high-accuracy data acquisition in instrumentation, medical, and industrial applications where low noise, excellent linearity, and minimal latency are critical.
FAQ
What is the maximum sampling rate supported by the AD7666ASTZRL?
The AD7666ASTZRL supports a maximum throughput rate of 500 kSPS, corresponding to a minimum conversion cycle time of 2 µs. This is achievable in both parallel and serial interface modes, with timing rigorously specified across –40°C to +85°C. The AD7666ASTZRL achieves this speed without pipeline delay, delivering fully settled 16-bit results immediately upon BUSY deassertion.
Does the AD7666ASTZRL include an internal voltage reference?
Yes, the AD7666ASTZRL integrates a 2.5 V internal reference with ±3 ppm/°C typical temperature drift and ±15 ppm/°C maximum drift over –40°C to +85°C. The reference is enabled by pulling PDREF LOW; its output appears on the REF pin and may be buffered using the internal reference buffer when PDBUF is LOW. External reference operation is also supported via REFBUFIN.
What digital interface options does the AD7666ASTZRL support?
The AD7666ASTZRL supports both parallel and serial digital interfaces. In parallel mode (SER/PAR = LOW), it uses a 16-bit bidirectional data bus (D[15:0]) with RD, CS, and BUSY control. In serial mode (SER/PAR = HIGH), it operates as SPI/QSPI/MICROWIRE/DSP-compatible slave or master, using SDOUT, SCLK, and SYNC pins - with configurable clock division, SYNC polarity, and SCLK inversion.
What is the analog input voltage range for the AD7666ASTZRL?
The AD7666ASTZRL accepts a unipolar analog input voltage range of 0 V to 2.5 V, referenced to INGND. The device specifies ±0.1 V absolute maximum ratings beyond this range, and analog input CMRR is 65 dB at 10 kHz. For operation outside this range, external signal conditioning (e.g., scaling amplifiers) is required - the AD7666ASTZRL itself does not support true bipolar or extended-range inputs.
How is the AD7666ASTZRL packaged, and what are its thermal characteristics?
The AD7666ASTZRL is supplied in a 48-lead LQFP (ST-48) package with exposed pad, compliant with JEDEC MO-220. Its thermal resistance is θJA = 91°C/W (free air). The device is specified for operation from –40°C to +85°C ambient, with junction temperature limited to 150°C. Power dissipation is 66 mW typical at 500 kSPS without reference, rising to 81 mW with internal reference enabled.
AD7666ASTZRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 48-LQFP
- Packaging:
- Tape & Reel (TR)
- 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:
- -
AD7666ASTZRL FAQ
1.How can I place an order for AD7666ASTZRL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7666ASTZRL 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 AD7666ASTZRL reliable?
The price and inventory of AD7666ASTZRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7666ASTZRL is usually 5 days.
3.What payment methods are accepted for AD7666ASTZRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7666ASTZRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7666ASTZRL?
AD7666ASTZRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7666ASTZRL 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 AD7666ASTZRL?
For technical support, including AD7666ASTZRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7666ASTZRL requirements.
6.How does Aetrix verify that AD7666ASTZRL is sourced from the original manufacturer or authorized distributors?
All AD7666ASTZRL 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 AD7666ASTZRL meets industry standards.
7.What is the process for return or replacement of AD7666ASTZRL?
All AD7666ASTZRL units undergo pre-shipment inspection (PSI). If there is an issue with AD7666ASTZRL, 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 AD7666ASTZRL part is unused and in its original packaging.
Return procedure for AD7666ASTZRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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