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Analog Devices Inc. AD7675ASTZ
- Part No.:
- AD7675ASTZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
AD7675ASTZ.pdf
- Description:
- IC ADC 16BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,994
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Product details
Overview
AD7675ASTZ 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 ±2.5 V differential input range, 1.5 LSB max INL, 94 dB typical SNR at 45 kHz, and no pipeline delay-enabling high-precision data acquisition in medical CT scanners and battery-powered instrumentation.
For engineers reviewing the AD7675ASTZ datasheet, AD7675ASTZ pinout, AD7675ASTZ application, or AD7675ASTZ equivalent, this page provides verified technical context, interface timing constraints, real-world AC/DC accuracy trade-offs, and validated drop-in alternatives for industrial and medical signal chain design.
Technical Context
The AD7675ASTZ implements a charge redistribution SAR architecture with on-chip track-and-hold, internal conversion clock, and factory-calibrated error correction circuitry. Its differential input stage achieves 79 dB CMRR at 10 kHz and supports true bipolar operation via external ±2.5 V reference.
It offers dual interface modes: 16-bit parallel (8-bit nibble-swappable) or SPI/QSPI/MICROWIRE-compatible 2-wire serial, with configurable SYNC polarity, SCLK inversion, and internal/external clock selection-all operating across 3 V or 5 V logic levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits with no missing codes-guarantees monotonicity and full-scale fidelity for precision measurement systems. |
| Throughput Rate | 100 kSPS maximum-supports real-time spectrum analysis and fast transient capture without latency. |
| Differential Input Range | ±2.5 V-enables direct connection to industrial sensor bridges and medical front-ends without gain scaling. |
| INL | ±1.5 LSB max-limits integral nonlinearity error to <0.0023% of full scale, critical for calibration-grade instrumentation. |
| SNR @ 45 kHz | 94 dB typical-translates to ~15.4 effective number of bits (ENOB), sufficient for 16-bit dynamic range preservation. |
| Power Dissipation | 17 mW at 100 kSPS; 15 µW at 100 SPS-enables ultra-low-power operation in portable diagnostic devices. |
| Aperture Jitter | 5 ps rms-minimizes sampling uncertainty for high-frequency signal reconstruction up to 3.9 MHz bandwidth. |
Pinout & Package
AD7675ASTZ is housed in a 48-lead LQFP (ST-48) package with exposed pad thermal enhancement. Pin assignments are validated per Analog Devices' official pin configuration diagram (Rev. A, p.7).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN– | Differential analog inputs | Accept true differential ±2.5 V signals; reject common-mode noise up to 79 dB at 10 kHz. |
| REF, REFGND | External reference interface | Supports 2.3–2.5 V external reference; 35 µA max current draw enables low-noise ADR421 use. |
| CNVST | Conversion start trigger | Falling-edge–initiated sampling with 2 ns aperture delay-critical for low-jitter synchronized acquisition. |
| BUSY | Conversion status indicator | Active-HIGH pulse (1.25 µs min width) signals ongoing conversion; falling edge serves as data-ready strobe. |
| SER/PAR | Interface mode select | LOW = parallel (16-bit D[15:0]); HIGH = serial (SDOUT/SCLK/SYNC)-enables flexible host integration. |
| OB/2C | Output coding control | HIGH = straight binary; LOW = two's complement-simplifies signed math in DSP-based processing chains. |
| PD | Power-down enable | Logic HIGH reduces current to ≤7 µW-essential for duty-cycled battery operation in portable analyzers. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after BUSY deassertion-enables deterministic real-time control loops in closed-loop process systems. |
| Single 5 V supply operation | Eliminates dual-rail power design complexity while maintaining 16-bit linearity-reduces BOM count and PCB area in space-constrained modules. |
| Pin-to-pin compatibility with AD7660 | Enables seamless upgrade path from 16-bit/500 kSPS AD7660 without layout changes-accelerates design iteration in legacy instrumentation platforms. |
| AC/DC comprehensive testing | Factory-tested for SNR, THD, SFDR, gain, offset, and INL-reduces system-level validation burden for FDA-cleared medical devices. |
| Low power at reduced throughput | 15 µW at 100 SPS-extends battery life >1 year in handheld ECG monitors using intermittent sampling strategy. |
Applications
| CT Scanners | Data Acquisition Systems |
|---|---|
Use Scenario: High-speed digitization of X-ray detector outputs during rotational gantry sweep. IC Role / Device Role / Timing Role: Primary ADC capturing 100 kSPS differential sensor data with <5 ps jitter to preserve spatial resolution. Use Value: 94 dB SNR ensures accurate Hounsfield unit calculation; no missing codes prevents artifact generation in reconstructed images. |
Use Scenario: Modular rack-mounted DAQ unit acquiring multi-channel analog sensor data in industrial test benches. IC Role / Device Role / Timing Role: Channel-isolated 16-bit ADC with parallel interface for FPGA-based real-time buffering and timestamping. Use Value: 1.5 LSB INL guarantees traceable metrology compliance; SER/PAR flexibility allows reuse across 3V/5V controller generations. |
| Portable Medical Instruments | Process Control Transmitters |
Use Scenario: Battery-powered ultrasound probe digitizing RF echo signals with minimal self-heating. IC Role / Device Role / Timing Role: Low-power SAR ADC operating at 100 SPS in sleep mode, waking on trigger for burst acquisition. Use Value: 15 µW standby power extends Li-ion runtime; differential input rejects EMI from adjacent RF circuits. |
Use Scenario: 4–20 mA loop-powered transmitter digitizing temperature/pressure sensor outputs in hazardous areas. IC Role / Device Role / Timing Role: Isolated ADC interfacing to sigma-delta modulator front-end with precise 2.5 V reference tracking. Use Value: ±2.5 V input range matches industrial sensor output spans; 79 dB CMRR 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, same 48-lead LQFP package and pinout; 2.5 LSB INL vs. AD7675ASTZ's 1.5 LSB. | Higher speed but lower DC precision-suitable where throughput > accuracy (e.g., vibration monitoring). | Select AD7660ASTZ only when ≥500 kSPS is required and ±2.5 LSB INL is acceptable for system calibration. |
| AD7676ASTZ | 250 kSPS, identical architecture and pinout; improved 1.0 LSB INL and 95 dB SNR; requires same ±2.5 V reference. | Higher performance grade-used in next-gen CT scanners requiring tighter linearity specs. | Choose AD7676ASTZ when upgrading for enhanced ENOB (>15.5 bits) without changing PCB layout or firmware interface logic. |
Compared with AD7675ASTZ, AD7660ASTZ trades 4× speed for relaxed linearity, while AD7676ASTZ delivers 2.5× speed and tighter INL within identical footprint-making AD7675ASTZ the optimal balance of cost, precision, and power for mid-tier medical and industrial DAQ.
Availability
AD7675ASTZ is available at Aetrix Electronics and suitable for CT scanners, portable medical instruments, industrial data acquisition systems, and process control transmitters requiring stable component supply across extended product lifecycles.
Supply support for AD7675ASTZ 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, founded in 1965 and headquartered in Wilmington, MA.
The AD7675ASTZ belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered specifically for high-fidelity, low-latency data acquisition in medical imaging, test equipment, and industrial automation.
FAQ
What is the maximum sampling rate supported by the AD7675ASTZ?
The AD7675ASTZ supports a maximum throughput rate of 100 kSPS, corresponding to a minimum conversion time of 10 µs per sample. This is confirmed in the "Throughput Rate" specification table (Rev. A, p.2), where 100 kSPS is listed as the guaranteed maximum under all operating conditions including –40°C to +85°C and AVDD = DVDD = 5 V.
Does the AD7675ASTZ require an external reference voltage?
Yes, the AD7675ASTZ requires an external reference voltage applied to the REF pin, with a specified range of 2.3 V to 2.5 V. The device draws up to 35 µA from the reference source at 100 kSPS, and REFGND must be connected to a clean analog ground plane. No internal reference is provided.
Is the AD7675ASTZ pin-compatible with other devices in the PulSAR family?
Yes, the AD7675ASTZ is explicitly stated as pin-to-pin compatible with the AD7660ASTZ in the "Features" section (Rev. A, p.1). Both share identical 48-lead LQFP (ST-48) packaging and matching pin functions-including CNVST, BUSY, SER/PAR, and parallel DATA bus assignments-enabling direct replacement without PCB modification.
What power supply configurations does the AD7675ASTZ support?
The AD7675ASTZ operates from three independent supplies: AVDD (4.75–5.25 V, analog), DVDD (4.75–5.25 V, digital core), and OVDD (2.7–5.25 V, I/O interface). OVDD may be set to 3.3 V or 5 V to match host logic levels, enabling interoperability with both 3 V and 5 V microcontrollers and FPGAs.
How does the AD7675ASTZ handle differential input signals?
The AD7675ASTZ accepts true differential analog inputs at IN+ and IN–, supporting a ±2.5 V range referenced to REFGND. Its input structure provides 79 dB CMRR at 10 kHz and high input impedance, allowing direct connection to precision op-amp drivers like the AD8021 without gain error or external attenuation networks.
AD7675ASTZ 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):
- 100k
- 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
- 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:
- -
AD7675ASTZ FAQ
1.How can I place an order for AD7675ASTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7675ASTZ 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 AD7675ASTZ reliable?
The price and inventory of AD7675ASTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7675ASTZ is usually 5 days.
3.What payment methods are accepted for AD7675ASTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7675ASTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7675ASTZ?
AD7675ASTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7675ASTZ 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 AD7675ASTZ?
For technical support, including AD7675ASTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7675ASTZ requirements.
6.How does Aetrix verify that AD7675ASTZ is sourced from the original manufacturer or authorized distributors?
All AD7675ASTZ 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 AD7675ASTZ meets industry standards.
7.What is the process for return or replacement of AD7675ASTZ?
All AD7675ASTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7675ASTZ, 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 AD7675ASTZ part is unused and in its original packaging.
Return procedure for AD7675ASTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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