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Analog Devices Inc. AD7675AST
- Part No.:
- AD7675AST
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
AD7675AST.pdf
- Description:
- IC ADC 16BIT DIFF INP 48-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,166
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Product details
Overview
AD7675AST from Analog Devices is a 16-bit, 100 kSPS, fully differential successive approximation register (SAR) analog-to-digital converter operating from a single 5 V supply. It delivers ±1.5 LSB INL, 94 dB SNR at 45 kHz, and no missing codes over its ±2.5 V differential input range. It serves as the precision front-end digitizer in medical CT scanners and high-fidelity data acquisition systems.
For engineers reviewing the AD7675AST datasheet, AD7675AST pinout, AD7675AST application, or AD7675AST equivalent, this page provides verified functional identity, LQFP-48 package mapping, confirmed serial/parallel interface behavior, real-world timing constraints (e.g., 10 µs conversion cycle), and two validated alternative ADCs with documented parameter trade-offs.
Technical Context
The AD7675AST implements a charge redistribution SAR architecture with on-chip track-and-hold, eliminating pipeline delay and enabling true multiplexed-channel sampling. Its internal error correction circuitry ensures monotonic 16-bit transfer characteristics and guarantees no missing codes across temperature.
It supports dual-mode digital interfacing: 16-bit parallel (with BYTESWAP and OB/2C configuration) or 2-wire SPI/QSPI/MICROWIRE-compatible serial (with programmable SCLK division via DIVSCLK[1:0]). All digital I/O operates at either 3 V or 5 V logic levels, referenced to OVDD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits - guarantees full-scale quantization step of 76.3 µV over ±2.5 V range |
| Throughput Rate | 100 kSPS - fixed 10 µs conversion cycle enables deterministic sampling for real-time control loops |
| INL | ±1.5 LSB max - ensures linearity error ≤0.0015% FS, critical for calibration-sensitive instrumentation |
| S/(N+D) | 94 dB typ @ 45 kHz - supports high-fidelity spectrum analysis up to Nyquist frequency of 50 kHz |
| Power Dissipation | 17 mW @ 100 kSPS - scales down to 15 µW @ 100 SPS, enabling battery-powered portable diagnostics |
| Analog Input Range | Differential ±2.5 V - rejects common-mode noise while accepting bipolar industrial sensor outputs |
| Reference Voltage | External 2.3–2.5 V - decouples accuracy from AVDD drift; REFGND pin enables Kelvin sensing |
Pinout & Package
AD7675AST is housed in a 48-lead LQFP (ST-48) package with exposed thermal pad. Pin 1 identifier located at top-left corner; pins numbered counterclockwise. Analog and digital grounds are segregated (AGND, DGND, OGND) and must be connected per layout guidelines to maintain 94 dB AC performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN– | Differential analog inputs | Accept true differential signal; CMRR ≥79 dB @ 10 kHz enables rejection of EMI-coupled noise |
| REF, REFGND | External reference interface | REFGND is dedicated Kelvin return-separate from AGND-to eliminate ground bounce errors |
| CNVST | Conversion start trigger | Falling-edge sensitive; aperture jitter = 5 ps rms-supports low-jitter sampling for phase-coherent measurements |
| BUSY | Conversion status indicator | Active-HIGH pulse signals conversion progress; falling edge serves as precise data-ready strobe |
| SER/PAR, OB/2C, BYTESWAP | Interface mode controls | Configure serial vs. parallel output, straight binary vs. two's complement, and byte ordering without firmware change |
| SDOUT, SCLK, SYNC | Serial port outputs | Master-read capable; SDOUT valid on both SCLK edges when EXT/INT = LOW-reduces timing margin pressure |
| PD, RESET | Power and initialization controls | PD reduces current to 7 µW max; RESET aborts ongoing conversion-essential for fault-recovery sequences |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Enables immediate post-conversion processing-critical for closed-loop feedback in motor control |
| Hardware factory calibration | Eliminates need for user-performed gain/offset trim; dc specs (±22 LSB full-scale error) hold over –40°C to +85°C |
| Single 5 V supply operation | Reduces BOM count by removing separate analog/digital rail regulators; AVDD/DVDD/OVDD all accept 4.75–5.25 V |
| Pin-to-pin compatible with AD7660 | Allows drop-in upgrade path from 16-bit/500 kSPS AD7660-preserves PCB layout while improving linearity (1.5 vs. 3 LSB INL) |
| 3.9 MHz –3 dB input bandwidth | Provides inherent anti-aliasing for baseband signals up to 20 kHz-reduces external filter complexity |
Applications
| CT Scanners | Data Acquisition Systems |
|---|---|
Use Scenario: Digitizing X-ray detector analog outputs in multi-slice computed tomography units. IC Role / Device Role / Timing Role: Precision front-end ADC capturing low-noise, wide-dynamic-range detector signals at synchronized intervals. Use Value: 94 dB SNR and ±1.5 LSB INL ensure accurate Hounsfield unit calculation; no missing codes prevent image artifacts in bone/soft-tissue boundaries. | Use Scenario: High-accuracy voltage/current monitoring in automated test equipment (ATE) racks. IC Role / Device Role / Timing Role: Simultaneous sampling node in multi-channel DAQ cards with deterministic 10 µs conversion latency. Use Value: Differential input rejects ground loop noise; BUSY falling edge provides jitter-free data latch timing for FPGA capture logic. |
| Medical Instrumentation | Process Control |
Use Scenario: Vital sign monitoring in portable ECG/EEG devices requiring long battery life. IC Role / Device Role / Timing Role: Low-power ADC converting amplified biopotential signals with minimal quiescent current. Use Value: 15 µW power at 100 SPS extends battery runtime; 16-bit resolution captures microvolt-level ST-segment shifts. | Use Scenario: Closed-loop control of industrial actuators using feedback from strain gauges and RTDs. IC Role / Device Role / Timing Role: High-linearity ADC in PLC analog input modules interfacing with 4–20 mA transmitters. Use Value: ±2.5 V differential range accommodates bipolar bridge outputs; CMRR ≥79 dB suppresses 50/60 Hz mains interference. |
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 |
|---|---|---|---|
| AD7660ASTZ | 500 kSPS throughput, ±3 LSB INL, same LQFP-48 package, no hardware calibration | Higher speed but lower linearity; requires external calibration for metrology-grade use | Select AD7660ASTZ only when throughput >100 kSPS is mandatory and INL <±2 LSB is not required |
| ADS8860IDRCT | 16-bit, 100 kSPS, SPI-only interface, 1.8 V supply, 0.65 mW @ 100 kSPS | Ultra-low power and smaller WSON-10 package; lacks parallel interface and differential input | Choose ADS8860IDRCT for space-constrained, battery-operated IoT sensors where differential input is unnecessary |
Compared with AD7675AST, AD7660ASTZ trades linearity for speed and lacks factory calibration, while ADS8860IDRCT sacrifices interface flexibility and analog input architecture for extreme power efficiency and footprint reduction-neither is pin-compatible, and both require PCB redesign.
Availability
AD7675AST is available at Aetrix Electronics and suitable for CT scanners, portable medical instruments, industrial process controllers, and high-precision data acquisition systems requiring stable component supply across extended temperature ranges.
Supply support for AD7675AST 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.
The AD7675AST belongs to the PulSAR® family of precision SAR ADCs designed specifically for applications demanding high resolution, excellent linearity, and low power-especially in medical imaging and industrial measurement.
FAQ
What is the absolute maximum input voltage rating for the AD7675AST analog inputs?
The AD7675AST analog inputs (IN+, IN–, REF, REFGND) tolerate voltages from AGND – 0.3 V to AVDD + 0.3 V. Exceeding this range risks forward-biasing internal ESD diodes, potentially causing latch-up or permanent damage. Always limit input transients using external clamping or series resistance per Figure 6 in the AD7675AST datasheet.
Does the AD7675AST require an external reference voltage source?
Yes, the AD7675AST requires an external precision reference voltage applied to the REF pin, with REFGND as its dedicated return. The specified range is 2.3 V to 2.5 V. Using the internal reference of another device is not supported-the AD7675AST has no internal reference generator and relies entirely on this external source for full-scale accuracy.
Can the AD7675AST operate with a 3 V digital interface while using a 5 V analog supply?
Yes, the AD7675AST supports mixed-voltage operation: AVDD = 5 V for analog circuitry, while OVDD can be set to 3 V to interface directly with 3 V logic families. DVDD may also be 3 V if digital core timing permits. This is explicitly validated in the datasheet under "Digital Inputs" and "Digital Outputs" sections with VIH/VIL thresholds defined for both 3 V and 5 V operation.
What is the purpose of the BYTESWAP pin on the AD7675AST?
The BYTESWAP pin configures byte ordering in parallel interface mode: when LOW, D[7:0] carries the LSB and D[15:8] carries the MSB; when HIGH, D[7:0] carries the MSB and D[15:8] carries the LSB. This eliminates need for software byte-swapping in host processors like ARM Cortex-M or x86, simplifying driver development for the AD7675AST.
How does the power-down mode function on the AD7675AST?
The AD7675AST enters power-down mode when the PD pin is driven HIGH, reducing total supply current to ≤7 µW. Conversions are inhibited after completion of the current cycle. Recovery time is negligible-conversion resumes on next CNVST edge. This mode is essential for duty-cycled applications such as battery-powered handheld meters using the AD7675AST.
AD7675AST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 48-LQFP
- Packaging:
- Bag
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7675AST FAQ
1.How can I place an order for AD7675AST through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7675AST 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 AD7675AST reliable?
The price and inventory of AD7675AST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7675AST is usually 5 days.
3.What payment methods are accepted for AD7675AST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7675AST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7675AST?
AD7675AST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7675AST 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 AD7675AST?
For technical support, including AD7675AST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7675AST requirements.
6.How does Aetrix verify that AD7675AST is sourced from the original manufacturer or authorized distributors?
All AD7675AST 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 AD7675AST meets industry standards.
7.What is the process for return or replacement of AD7675AST?
All AD7675AST units undergo pre-shipment inspection (PSI). If there is an issue with AD7675AST, 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 AD7675AST part is unused and in its original packaging.
Return procedure for AD7675AST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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