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Analog Devices Inc. AD7482ASTZ
- Part No.:
- AD7482ASTZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
AD7482ASTZ.pdf
- Description:
- IC ADC 12BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,965
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Product details
Overview
AD7482ASTZ from Analog Devices is a 12-bit, 3 MSPS successive approximation ADC with parallel interface, 40 MHz input bandwidth, internal 2.5 V reference, and dual power-saving modes (nap/standby). It operates from a single 5 V supply and supports shifted input ranges (−200 mV to +2.7 V) for single-supply op amp interfacing in high-speed data acquisition systems.
For engineers reviewing the AD7482ASTZ datasheet, AD7482ASTZ pinout, AD7482ASTZ application, or AD7482ASTZ equivalent, key selection criteria include throughput rate (3 MSPS), dc accuracy (±0.5 LSB INL, B grade), overrange capability (13th bit), VDRIVE-adjustable digital interface voltage (2.7–5.25 V), and 48-lead LQFP package thermal performance (θJA = 50°C/W).
Technical Context
The AD7482ASTZ uses an algorithmic SAR architecture with capacitive DAC and integrated track-and-hold, delivering no pipeline delay and 300 ns conversion time. Its analog front-end supports full-scale overrange detection via D12 and user-accessible offset register for system-level calibration.
It features two parallel interface modes (Mode 1 and Mode 2), configurable via MODE1/MODE2 pins, with BUSY timing behavior differing between modes-latching output on BUSY rise in Mode 1 versus post-CONVST latch in Mode 2-enabling flexible microcontroller/DSP synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with 13th-bit overrange flag (D12) for ±8% input excursion beyond nominal 0–2.5 V range |
| Throughput Rate | 3 MSPS in Parallel Mode 2; 2.5 MSPS in Parallel Mode 1-directly impacts real-time sampling window and buffer depth requirements |
| SINAD | 71 dB at 1 MHz input-defines usable dynamic range for medium-bandwidth signal digitization |
| INL (B Grade) | ±0.5 LSB-ensures monotonicity and <0.012% full-scale linearity error in precision measurement |
| Power Dissipation | 90 mW normal mode; 2.5 mW nap mode; 10 µW standby-enables burst-mode operation in power-constrained embedded systems |
| Analog Input Range | −200 mV to +2.7 V with offset shift-supports bipolar signal capture using single-supply op amps without level-shifting circuitry |
| VDRIVE Range | 2.7 V to 5.25 V-allows interface voltage matching to host logic (e.g., 3.3 V MCU I/O) while AVDD/DVDD remain at 5 V |
Pinout & Package
The AD7482ASTZ is housed in a 48-lead LQFP package (7 mm × 7 mm, 0.5 mm pitch) with exposed pad for thermal enhancement. Pin layout separates analog (AVDD, AGND, VIN, REFOUT, REFIN, REFSEL, CBIAS) and digital (DVDD, DGND, D0–D12, CS, RD, WRITE, BUSY, CONVST, MODE1, MODE2, STBY, NAP, RESET, CLIP, VDRIVE) domains to minimize noise coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Analog input channel | Single-ended input accepting −200 mV to +2.7 V; requires external driver with ≥40 MHz bandwidth (e.g., AD8021) |
| REFOUT / REFIN / REFSEL | Reference subsystem | REFOUT delivers buffered 2.5 V internal reference; REFIN accepts external 2.5 V source; REFSEL decouples internal ref or grounds external ref path |
| D0–D11 | Data I/O bus | 12-bit straight binary output (D11 = MSB); three-state controlled by CS/RD; voltage levels set by VDRIVE |
| D12 | Overrange indicator | Active-high flag signaling input > +2.7 V or < −200 mV; enables fault detection without software parsing |
| CONVST | Conversion trigger | Falling-edge initiated sampling; initiates T/H hold and SAR sequence-synchronizes acquisition to system clock edge |
| BUSY | Conversion status | Active-low open-drain output; timing behavior differs between Mode 1 (latched result) and Mode 2 (conversion complete) |
| STBY / NAP | Power control | STBY = logic high → 10 µW standby; NAP = logic high → 2.5 mW low-power wake-ready mode |
| VDRIVE | Digital I/O voltage reference | Sets logic thresholds for all digital pins (CS, RD, etc.) independent of AVDD/DVDD-enables mixed-voltage system interfacing |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay SAR architecture | Enables deterministic latency (300 ns conversion + 70 ns acquisition) for closed-loop control timing budgets |
| User-accessible offset register | Allows real-time system offset correction without external DAC or calibration hardware |
| Full-scale overrange mode (13th bit) | Preserves signal integrity during transient excursions beyond nominal range-avoids clipping-induced distortion |
| Two parallel interface modes | Mode 1 simplifies read timing (BUSY rise = data valid); Mode 2 maximizes throughput (3 MSPS) with external CONVST coordination |
| VDRIVE pin for digital interface scaling | Permits direct connection to 3.3 V or 5 V logic families without level translators-reduces BOM count and layout complexity |
Applications
| High-Speed Data Acquisition | Industrial Process Monitoring |
|---|---|
Use Scenario: Digitizing sensor outputs (e.g., strain gauges, accelerometers) in automated test equipment requiring 1–3 MSPS sampling with minimal latency. IC Role / Device Role / Timing Role: Primary ADC capturing analog transducer signals; CONVST synchronized to system trigger; BUSY used for DMA request generation. Use Value: 300 ns conversion time and no pipeline delay ensure sub-microsecond response to event triggers-critical for time-domain analysis and fault capture. | Use Scenario: Monitoring temperature, pressure, and flow in PLC-based factory automation systems operating across −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Precision analog-to-digital converter interfaced to isolated analog inputs; internal 2.5 V reference eliminates external ref component; STBY mode reduces average power during idle cycles. Use Value: ±0.5 LSB INL and −40°C to +85°C guaranteed operation enable <0.02% measurement uncertainty without field recalibration. |
| Medical Instrumentation | Communications Signal Analysis |
Use Scenario: ECG/EEG front-end digitization where signal fidelity up to 1 MHz must be preserved with low THD (−90 dB typical). IC Role / Device Role / Timing Role: High-fidelity ADC stage following low-noise instrumentation amplifier; shifted input range (−200 mV to +2.7 V) accommodates bipolar bio-potential signals without dual supplies. Use Value: 40 MHz full-power bandwidth and 71 dB SINAD at 1 MHz support accurate reconstruction of fast-rising cardiac waveforms and neural spikes. | Use Scenario: Baseband I/Q sampling in software-defined radio receivers analyzing modulated signals up to 10 MHz bandwidth. IC Role / Device Role / Timing Role: Dual-channel (I/Q) ADC subsystem using two AD7482ASTZ devices; MODE2 configuration enables synchronous 3 MSPS sampling; D12 flags overrange during signal bursts. Use Value: 13th-bit overrange detection prevents data loss during AGC transients-maintains signal integrity during RF gain switching events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7484ASTZ | 14-bit resolution, same 48-lead LQFP package, pin-compatible upgrade with identical pinout and interface logic | Higher resolution required for spectral analysis or metrology-grade measurements where 12-bit quantization noise is limiting | Select AD7484ASTZ when system SNR budget demands >74 dB theoretical SINAD and board layout reuse is critical |
| ADS8325IPFBT | 16-bit, 2.7 MSPS, SPI interface, 3 V supply only, no internal reference, different package (48-pin TQFP) | Low-power portable instrumentation where SPI simplifies routing and 3 V operation reduces system power | Choose ADS8325IPFBT for battery-powered designs needing higher resolution but accepting serial interface overhead and external reference design effort |
Compared with AD7482ASTZ, AD7484ASTZ offers direct pin-compatible resolution upgrade without layout change, while ADS8325IPFBT trades parallel interface simplicity for higher resolution and lower supply voltage at the cost of added reference and interface design complexity.
Availability
AD7482ASTZ is available at Aetrix Electronics and suitable for high-speed data acquisition, industrial process monitoring, medical instrumentation, and communications signal analysis requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7482ASTZ 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, with design and manufacturing expertise spanning precision converters, amplifiers, and RF ICs.
The AD7482ASTZ belongs to Analog Devices' high-speed SAR ADC product line, engineered for applications demanding low-latency, high-fidelity digitization in space-constrained industrial and medical systems operating from single 5 V supplies.
FAQ
What is the maximum input frequency the AD7482ASTZ can accurately digitize?
The AD7482ASTZ has a full-power bandwidth of 40 MHz at the −3 dB point, meaning it maintains specified ac performance (e.g., SINAD ≥71 dB) for input signals up to 40 MHz. For highest fidelity, use with analog drivers like the AD8021 and maintain proper PCB layout with ground plane separation and decoupling per the datasheet guidelines.
Does the AD7482ASTZ require an external reference, or does it have an internal one?
The AD7482ASTZ includes an internal 2.5 V reference buffered at REFOUT, eliminating the need for an external reference in most applications. However, it also supports external 2.5 V references via REFIN for improved stability or temperature drift performance-REFSEL must be grounded when using an external source.
How does the overrange capability (13th bit) function in the AD7482ASTZ?
The AD7482ASTZ provides overrange detection via the D12 pin: when the analog input exceeds +2.7 V or falls below −200 mV, D12 asserts high while D0–D11 retain the clipped 12-bit code. This allows firmware to detect saturation events without parsing codes-critical for protecting downstream signal processing algorithms from corrupted data.
Can the AD7482ASTZ interface directly with a 3.3 V microcontroller?
Yes-the AD7482ASTZ's VDRIVE pin accepts 2.7 V to 5.25 V, allowing its digital interface (CS, RD, D0–D12, etc.) to operate at 3.3 V logic levels while AVDD/DVDD remain at 5 V. This eliminates level-shifting components and ensures reliable timing margins when interfacing with common 3.3 V MCUs and DSPs.
What is the difference between nap mode and standby mode in the AD7482ASTZ?
Nap mode (NAP = high) reduces power to 2.5 mW while keeping reference circuitry active for fast wake-up (<300 ns to conversion start with external reference); standby mode (STBY = high) cuts power to 10 µW but requires longer wake-up (500 ms with internal ref, 80 µs with external ref). Nap mode suits burst acquisition; standby suits infrequent sampling.
AD7482ASTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 3M
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- 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:
- -
AD7482ASTZ FAQ
1.How can I place an order for AD7482ASTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7482ASTZ 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 AD7482ASTZ reliable?
The price and inventory of AD7482ASTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7482ASTZ is usually 5 days.
3.What payment methods are accepted for AD7482ASTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7482ASTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7482ASTZ?
AD7482ASTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7482ASTZ 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 AD7482ASTZ?
For technical support, including AD7482ASTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7482ASTZ requirements.
6.How does Aetrix verify that AD7482ASTZ is sourced from the original manufacturer or authorized distributors?
All AD7482ASTZ 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 AD7482ASTZ meets industry standards.
7.What is the process for return or replacement of AD7482ASTZ?
All AD7482ASTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7482ASTZ, 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 AD7482ASTZ part is unused and in its original packaging.
Return procedure for AD7482ASTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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