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Analog Devices Inc. AD7679ASTZRL
- Part No.:
- AD7679ASTZRL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
AD7679ASTZRL.pdf
- Description:
- IC ADC 18BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,482
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Product details
Overview
AD7679ASTZRL from Analog Devices is an 18-bit, 570 kSPS, fully differential SAR analog-to-digital converter operating on a single 5 V supply. It features ±2.5 LSB INL, 103 dB dynamic range (VREF = 5 V), and dual parallel/serial interface support. It serves high-precision data acquisition in CT scanners and geophone sensor systems.
For engineers reviewing the AD7679ASTZRL datasheet, AD7679ASTZRL pinout, AD7679ASTZRL application, or AD7679ASTZRL equivalent, this page delivers verified specifications, package mapping, interface mode behavior, real-world use-value per application, and two confirmed alternative parts with documented functional and layout implications.
Technical Context
The AD7679ASTZRL employs charge redistribution SAR architecture with no pipeline delay, enabling immediate result availability after conversion. Its internal reference buffer accepts 2.5 V input to generate a stable 4.096 V reference, supporting differential input ranges up to ±VREF (±5 V).
It supports four configurable digital interface modes-18-bit, 16-bit, 8-bit byte, and serial-selected via MODE0/MODE1 pins. Serial operation includes master/slave configurations with programmable SCLK division, SYNC polarity inversion, and SDOUT edge alignment controlled by DIVSCLK[1:0], INVSYNC, and INVSCLK pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with no missing codes - guarantees monotonicity and full-scale fidelity for precision measurement. |
| Throughput Rate | 570 kSPS - enables real-time capture of fast transients in medical imaging and seismic sensing. |
| INL | ±2.5 LSB max - corresponds to ±9.5 ppm of full scale, meeting stringent linearity requirements in instrumentation. |
| Differential Input Range | ±VREF (up to ±5 V) - supports true bipolar signal conditioning without external level-shifting circuitry. |
| Dynamic Range | 103 dB typ @ VREF = 5 V - allows detection of low-amplitude signals buried in noise, critical for hydrophone arrays. |
| Power Dissipation | 76 mW @ 500 kSPS; 150 μW @ 1 kSPS - enables scalable power management across burst-mode and continuous acquisition. |
| Reference Buffer | Internal 4.096 V output when 2.5 V applied to REFBUFIN - eliminates need for external reference IC in space-constrained designs. |
Pinout & Package
The AD7679ASTZRL is available in a 48-lead LFCSP (Lead Frame Chip Scale Package) with exposed pad internally connected to AGND. Thermal performance is optimized with θJA = 26°C/W, supporting high-density PCB layouts in industrial and medical equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN– | Differential analog inputs | Accept true differential signals up to ±5 V; CMRR ≥68 dB at 100 kHz ensures noise rejection in noisy environments. |
| REF, REFGND | External reference input pair | Enable use of precision external references; bypassing required for stability when internal buffer is disabled. |
| REFBUFIN, PDBUF | Reference buffer control | REFBUFIN = 2.5 V → 4.096 V REF output; PDBUF = LOW activates buffer, HIGH disables it for external reference use. |
| CNVST | Conversion start trigger | Falling-edge initiated; acquisition time = 250 ns - supports tight timing control in synchronized multi-ADC systems. |
| BUSY | Conversion status indicator | Active-HIGH during conversion; falling edge signals valid data - usable as hardware-ready strobe for DMA or FPGA logic. |
| MODE0, MODE1 | Interface mode select | Selects 18-bit/16-bit/8-bit/serial bus configuration - determines D[0:17] functionality and pin multiplexing behavior. |
| D[0:17], SDOUT, SYNC, SCLK | Data I/O terminals | Parallel outputs active in MODE0/MODE1=00; serial outputs enabled in MODE0/MODE1=11 with full SPI/QSPI/MICROWIRE compatibility. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay (SAR architecture) | Zero-latency conversion enables deterministic timing for closed-loop control and real-time triggering. |
| Dual interface flexibility | Hardware-selectable 18-/16-/8-bit parallel or 3-wire serial mode simplifies integration into legacy microcontroller or modern FPGA platforms. |
| On-board reference buffer | Eliminates external reference IC and associated decoupling complexity while maintaining 4.096 V accuracy and low drift (±0.5 ppm/°C). |
| Single 5 V supply operation | Reduces system BOM count and layout area by removing separate analog/digital rail generation for ADC core and interface logic. |
| Low power scaling | 150 μW standby (1 kSPS) and 76 mW active (500 kSPS) allow adaptive sampling strategies in battery-powered portable instruments. |
Applications
| CT Scanners | Geophone Sensor Arrays |
|---|---|
Use Scenario: High-speed acquisition of X-ray detector signals during rotational gantry movement. IC Role / Device Role / Timing Role: Primary ADC capturing differential current outputs from photodiode arrays with sub-LSB linearity. Use Value: 103 dB dynamic range resolves low-contrast tissue boundaries; 570 kSPS throughput matches mechanical scan speed without undersampling. |
Use Scenario: Seismic vibration monitoring using multi-channel geophone strings deployed in oil exploration. IC Role / Device Role / Timing Role: Precision digitizer for low-noise, high-Z geophone outputs requiring true differential input and excellent CMRR. Use Value: ±2.5 LSB INL ensures accurate amplitude mapping of weak seismic reflections; internal reference buffer reduces channel-to-channel gain mismatch. |
| Medical Instrumentation | Spectrum Analysis Systems |
Use Scenario: Portable EEG/EMG devices acquiring bio-potential signals with high common-mode interference. IC Role / Device Role / Timing Role: Front-end ADC providing differential input, low power, and integrated reference for compact clinical-grade sensors. Use Value: Single 5 V supply and 150 μW idle power extend battery life; 68 dB analog input CMRR suppresses 50/60 Hz mains coupling. |
Use Scenario: Real-time RF spectrum analyzers measuring wideband signals with >100 dB SFDR requirement. IC Role / Device Role / Timing Role: High-resolution digitizer capturing IF or baseband signals with minimal harmonic distortion. Use Value: –115 dB THD and 120 dB SFDR at 2 kHz enable clean spectral analysis of adjacent channel interference and spurious emissions. |
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 |
|---|---|---|---|
| AD7678ASTZ | 18-bit, 400 kSPS, same pinout, no internal reference buffer | Lacks on-chip reference buffer; requires external 4.096 V reference and additional decoupling. | Choose when board space permits external reference and lower throughput suffices. |
| AD7665ASTZ | 16-bit, 500 kSPS, 48-lead LQFP, SPI-compatible serial interface only | Lower resolution (16-bit), no parallel interface, different pin assignment for serial signals. | Choose for cost-sensitive, lower-accuracy applications where serial-only interface is acceptable. |
Compared with AD7679ASTZRL, AD7678ASTZ trades throughput and reference integration for identical footprint and higher temperature grade (–40°C to +105°C), while AD7665ASTZ reduces resolution and interface flexibility to lower unit cost and simplify layout in non-critical measurement paths.
Availability
AD7679ASTZRL is available at Aetrix Electronics and suitable for CT scanners, geophone sensor arrays, and portable medical instrumentation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AD7679ASTZRL 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.
The AD7679ASTZRL belongs to the PulSAR® family of precision SAR ADCs designed for high dynamic range, low-latency data acquisition in medical imaging, test equipment, and industrial sensing applications.
FAQ
What is the maximum supported external reference voltage for AD7679ASTZRL?
The AD7679ASTZRL accepts an external reference voltage from 3 V to AVDD + 0.1 V (i.e., up to 5.35 V). When using the internal reference buffer, apply 2.5 V to REFBUFIN to generate a precise 4.096 V REF output. The REF pin must be decoupled with ≥10 µF ceramic + 100 nF film capacitor regardless of reference source.
Does AD7679ASTZRL support true differential input operation?
Yes, AD7679ASTZRL supports true differential input operation across IN+ and IN– with a full-scale range of ±VREF (up to ±5 V). Its analog input CMRR is 68 dB at 100 kHz, and input impedance remains stable across throughput rates, making it suitable for high-fidelity sensor interfacing without external instrumentation amplifiers.
How does the MODE0/MODE1 pin configuration affect AD7679ASTZRL's data bus behavior?
MODE0 and MODE1 pins configure AD7679ASTZRL's interface mode: 00 = 18-bit parallel, 01 = 16-bit parallel (high/low word selectable), 10 = 8-bit byte mode (four variants), and 11 = serial interface. In serial mode, pins D[4:5], D6–D9, D11–D13 assume serial control functions like SCLK, SYNC, SDOUT, and RDERROR - altering their default parallel roles.
Can AD7679ASTZRL operate with a 3 V digital interface supply?
Yes, AD7679ASTZRL supports 3 V digital interface operation via OVDD (pin 18), which may be set from 2.7 V to 5.25 V independently of DVDD (5 V). All digital outputs (SDOUT, SYNC, SCLK) are level-shifted to OVDD, and inputs (CS, RD, MODE0/1) accept 3 V logic levels - enabling direct connection to 3 V FPGAs or microcontrollers without level translators.
What thermal considerations apply to the AD7679ASTZRL's exposed pad?
The AD7679ASTZRL's exposed pad is internally connected to AGND and must be soldered to the PCB's analog ground plane for optimal thermal dissipation and EMI suppression. With θJA = 26°C/W in the LFCSP package, proper pad thermal vias (≥6 × 0.3 mm) to inner ground layers reduce junction-to-ambient rise by >15°C under full-load conditions, preserving INL and SNR performance.
AD7679ASTZRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 48-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 570k
- 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:
- -
AD7679ASTZRL FAQ
1.How can I place an order for AD7679ASTZRL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7679ASTZRL 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 AD7679ASTZRL reliable?
The price and inventory of AD7679ASTZRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7679ASTZRL is usually 5 days.
3.What payment methods are accepted for AD7679ASTZRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7679ASTZRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7679ASTZRL?
AD7679ASTZRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7679ASTZRL 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 AD7679ASTZRL?
For technical support, including AD7679ASTZRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7679ASTZRL requirements.
6.How does Aetrix verify that AD7679ASTZRL is sourced from the original manufacturer or authorized distributors?
All AD7679ASTZRL 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 AD7679ASTZRL meets industry standards.
7.What is the process for return or replacement of AD7679ASTZRL?
All AD7679ASTZRL units undergo pre-shipment inspection (PSI). If there is an issue with AD7679ASTZRL, 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 AD7679ASTZRL part is unused and in its original packaging.
Return procedure for AD7679ASTZRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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