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Analog Devices Inc. AD7674ASTZRL
- Part No.:
- AD7674ASTZRL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
AD7674ASTZRL.pdf
- Description:
- IC ADC 18BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,171
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Product details
Overview
AD7674ASTZRL from Analog Devices is an 18-bit, charge redistribution successive approximation register (SAR) analog-to-digital converter with ±2.5 LSB INL, 800 kSPS maximum throughput in warp mode, differential ±VREF input range up to ±5 V, and single 5 V supply operation - deployed in high-precision CT scanner front-ends and geophone data acquisition systems.
For engineers reviewing the AD7674ASTZRL datasheet, AD7674ASTZRL pinout, AD7674ASTZRL application, or AD7674ASTZRL equivalent, this page delivers verified specifications, interface mode behavior, real-world timing constraints, reference buffer configuration options, and validated alternative ADCs for medical imaging and seismic sensor signal chains.
Technical Context
The AD7674ASTZRL implements a fully differential SAR architecture with no pipeline delay, on-chip conversion clock, and integrated reference buffer - enabling immediate result availability after conversion completion. It supports three distinct conversion modes (warp, normal, impulse) with deterministic timing: 1.25 µs conversion cycle in warp mode, 1.5 µs in normal mode, and 1.75 µs in impulse mode.
Its dual-interface capability includes parallel (18-/16-/8-bit bus) and serial (SPI/QSPI/MICROWIRE/DSP-compatible) ports, with OVDD supporting 2.7 V to 5.25 V logic levels. The internal reference buffer accepts 2.5 V at REFBUFIN to deliver 4.096 V at REF, while PDBUF enables buffer enable/disable control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with no missing codes - guarantees monotonicity and full-scale code coverage across −40°C to +85°C. |
| INL | ±2.5 LSB max (±9.5 ppm of full scale) - ensures <0.001% absolute linearity error for precision instrumentation calibration. |
| Throughput | 800 kSPS in warp mode - enables real-time sampling of 390 kHz Nyquist-band signals without aliasing in spectrum analysis. |
| Differential Input Range | ±VREF, VREF up to 5 V - supports direct connection to ±4.096 V transducer outputs without external gain/level shift. |
| Dynamic Range | 103 dB typ at VREF = 5 V - provides >17 effective bits for low-noise geophone/hydrophone sensor digitization. |
| Power Dissipation | 98 mW typ at 800 kSPS - balances speed and thermal load in densely packed medical PCBs. |
| Reference Buffer | Internal buffer with 2.5 V REFBUFIN → 4.096 V REF output - eliminates need for external reference IC in space-constrained designs. |
Pinout & Package
AD7674ASTZRL is housed in a 48-lead LQFP package (ASTZ suffix), with exposed pad internally connected to AGND. Pin functions are validated per Analog Devices Rev. B datasheet Figures 4 and Table 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN− | Differential analog inputs | Accept true differential signal up to ±5 V; CMRR ≥65 dB at 100 kHz enables noise rejection in EMI-prone environments. |
| REF, REFGND | Reference voltage terminals | REF accepts external reference or buffered 4.096 V output; REFGND must be star-connected to AGND for <1 LSB noise coupling. |
| CNVST | Conversion start trigger | Falling-edge–initiated hold-and-convert; aperture jitter only 5 ps rms ensures <0.001° phase error at 100 kHz. |
| BUSY | Conversion status indicator | Active-high pulse signals conversion progress; falling edge serves as precise data-ready strobe for FPGA capture logic. |
| D[17:0], RD, CS | Parallel data interface | Configurable 18-/16-/8-bit bus with MODE0/MODE1 selection - supports legacy microprocessor interfacing without glue logic. |
| SDOUT, SCLK, SYNC | Serial interface outputs | SPI/QSPI-compatible master-mode serial port with programmable clock division (DIVSCLK[1:0]) for flexible host MCU synchronization. |
| PDBUF | Reference buffer control | Low = buffer enabled (4.096 V REF); high = buffer disabled (REF used directly) - allows trade-off between accuracy and power in battery-powered impulse mode. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline latency | SAR architecture delivers conversion result immediately upon BUSY deassertion - eliminates FIFO buffering in real-time control loops. |
| Three-speed conversion modes | Warp (800 kSPS), Normal (666 kSPS), Impulse (570 kSPS) - enables dynamic power/performance scaling in portable diagnostic equipment. |
| On-board reference buffer | Converts 2.5 V REFBUFIN to stable 4.096 V REF with ±0.05% output tolerance - removes external reference IC and reduces BOM count by one component. |
| Flexible digital interface | Single device supports 18-bit parallel, byte-wide parallel, and SPI serial readout - simplifies migration from legacy 16-bit systems to 18-bit resolution. |
| Low zero-error drift | ±0.5 ppm/°C temperature coefficient - maintains <1 LSB offset shift over full industrial temperature range without recalibration. |
Applications
| CT Scanner Signal Chain | Geophone Array Digitization |
|---|---|
Use Scenario: High-speed acquisition of X-ray detector analog outputs in multi-slice computed tomography systems. IC Role / Device Role / Timing Role: Primary SAR ADC capturing 18-bit projection data at ≥600 kSPS with sub-microsecond timing determinism. Use Value: 103 dB dynamic range resolves low-contrast tissue boundaries; ±2.5 LSB INL ensures quantitative Hounsfield unit accuracy across scan volumes. |
Use Scenario: Simultaneous digitization of low-amplitude seismic signals from multi-channel geophone strings in oil exploration. IC Role / Device Role / Timing Role: Precision ADC front-end with differential input rejecting common-mode ground noise in field-deployed sensor nodes. Use Value: 5 ps rms aperture jitter preserves phase coherence across channels; 160 µW power in impulse mode extends battery life in remote deployments. |
| Spectrum Analyzer Front-End | Medical Ultrasound Beamformer |
Use Scenario: Wideband RF signal capture in benchtop and portable spectrum analyzers requiring >100 dB SFDR. IC Role / Device Role / Timing Role: High-linearity ADC sampling IF signals at 2nd Nyquist zone with minimal harmonic distortion. Use Value: 120 dB spurious-free dynamic range at 2 kHz suppresses intermodulation artifacts; −115 dB THD enables clean spectral visualization. |
Use Scenario: Digitizing echo return signals from phased-array ultrasound transducers in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-latency ADC synchronizing with beam-steering timing engines for real-time image reconstruction. Use Value: No pipeline delay enables immediate post-processing; 1.25 µs warp-mode conversion supports >750 fps frame rates in high-resolution B-mode imaging. |
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 |
|---|---|---|---|
| AD7679ASTZ | 18-bit, 570 kSPS max, LFCSP-48 package, no internal reference buffer | Lacks on-chip REF buffer; requires external 4.096 V reference; lower power in impulse mode (120 µW) | Select when board space permits external reference and ultra-low standby power is critical. |
| AD7676ASTZ | 18-bit, 666 kSPS max, LQFP-48, identical pinout and buffer architecture | Lower throughput than AD7674ASTZRL but same INL (±2.5 LSB) and interface compatibility | Choose for cost-sensitive designs where 666 kSPS meets system bandwidth requirements. |
Compared with AD7674ASTZRL, AD7676ASTZ offers identical pinout and feature set at reduced speed, while AD7679ASTZ trades buffer integration for lower quiescent power - both require validation of timing margins and reference path stability in target signal chains.
Availability
AD7674ASTZRL is available at Aetrix Electronics and suitable for CT scanner subsystems, geophysical sensor arrays, and portable spectrum analyzers requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for AD7674ASTZRL 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 AD7674ASTZRL belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered specifically for high-dynamic-range data acquisition in medical imaging, seismic sensing, and test equipment where latency, linearity, and noise performance are non-negotiable.
FAQ
What is the maximum sampling rate of the AD7674ASTZRL and under what conditions is it achieved?
The AD7674ASTZRL achieves 800 kSPS maximum throughput in warp mode, which requires WARP = high and IMPULSE = low. This mode mandates minimum conversion rate enforcement to maintain full specified accuracy; timing is validated per Table 3 of the Rev. B datasheet with t2 = 1.25 µs between conversions.
Does the AD7674ASTZRL include an internal voltage reference, and how is it configured?
The AD7674ASTZRL does not include a standalone internal reference but integrates a reference buffer that converts 2.5 V applied to REFBUFIN into a precise 4.096 V output at REF. Configuration is controlled by PDBUF: low enables the buffer, high disables it - allowing use of either buffered or external reference sources.
Can the AD7674ASTZRL operate with a 3 V digital interface while using a 5 V analog supply?
Yes, the AD7674ASTZRL supports mixed-voltage operation: AVDD and DVDD are 5 V, while OVDD can be set to 3 V (within 2.7 V to 5.25 V range) to interface directly with 3 V logic families. Digital I/O levels are compliant with 3 V systems when OVDD = 3 V, per Table 2 VIH/VIL specifications.
What are the key timing differences between warp, normal, and impulse modes in the AD7674ASTZRL?
Warp mode has 1.25 µs conversion time and 1 ms max inter-conversion interval; normal mode uses 1.5 µs conversion time with no upper interval limit; impulse mode requires 1.75 µs conversion time and scales power linearly with throughput. All modes define distinct BUSY pulse widths per Table 4.
Is the AD7674ASTZRL pin-compatible with other PulSAR ADCs, and which ones?
Yes, the AD7674ASTZRL is pin-to-pin compatible with AD7676ASTZ and AD7679ASTZ per datasheet Product Highlights. All three share identical 48-lead LQFP footprints, matching pin functions for CNVST, BUSY, D[17:0], REF, IN+, IN−, and power/ground connections - enabling drop-in upgrades within the same PCB layout.
AD7674ASTZRL 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:
- 18
- Sampling Rate (Per Second):
- 800k
- 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:
- -
AD7674ASTZRL FAQ
1.How can I place an order for AD7674ASTZRL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7674ASTZRL 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 AD7674ASTZRL reliable?
The price and inventory of AD7674ASTZRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7674ASTZRL is usually 5 days.
3.What payment methods are accepted for AD7674ASTZRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7674ASTZRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7674ASTZRL?
AD7674ASTZRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7674ASTZRL 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 AD7674ASTZRL?
For technical support, including AD7674ASTZRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7674ASTZRL requirements.
6.How does Aetrix verify that AD7674ASTZRL is sourced from the original manufacturer or authorized distributors?
All AD7674ASTZRL 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 AD7674ASTZRL meets industry standards.
7.What is the process for return or replacement of AD7674ASTZRL?
All AD7674ASTZRL units undergo pre-shipment inspection (PSI). If there is an issue with AD7674ASTZRL, 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 AD7674ASTZRL part is unused and in its original packaging.
Return procedure for AD7674ASTZRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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