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Analog Devices Inc. AD7865ASZ-2REEL
- Part No.:
- AD7865ASZ-2REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 44-QFP
- Datasheet:
-
AD7865ASZ-2REEL.pdf
- Description:
- IC ADC 14BIT SAR 44MQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,142
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Product details
Overview
AD7865ASZ-2REEL from Analog Devices is a 14-bit, four-channel simultaneous-sampling analog-to-digital converter (ADC) with 2.4 µs conversion time per channel, 0.35 µs track/hold acquisition time, and unipolar input ranges of 0 V to 2.5 V or 0 V to 5 V. It operates from a single 5 V supply, consumes 100 mW typical power, and delivers 77 dB SNR at 100 kHz input - optimized for real-time motor control and power monitoring systems.
For engineers reviewing the AD7865ASZ-2REEL datasheet, AD7865ASZ-2REEL pinout, AD7865ASZ-2REEL application, or AD7865ASZ-2REEL equivalent, key selection considerations include its simultaneous sampling architecture, straight-binary output coding, ±1.5 LSB INL (B-grade), hardware/software channel sequencing, and PQFP-44 package compatibility with industrial signal acquisition layouts.
Technical Context
The AD7865ASZ-2REEL integrates four independent track/hold amplifiers and a single successive-approximation ADC core, enabling true simultaneous capture of four analog inputs while preserving phase coherence. Its aperture delay matching is ≤4 ns across channels, supporting synchronized multi-signal analysis in closed-loop control.
Conversion sequencing is configurable via hardware (SL1–SL4 pins) or software (DB0–DB3 register write), with internal clock generation (no external crystal required) and optional external 5 MHz clock support. The device uses straight-binary coding for unipolar ranges and features dedicated FRSTDATA and EOC signals for precise data-read timing coordination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete digital codes for high-fidelity representation of analog sensor or feedback signals. |
| Sampling Architecture | Four-channel simultaneous sampling - captures VIN1A/VIN1B, VIN2A/VIN2B, VIN3A/VIN3B, VIN4A/VIN4B at identical instants, critical for vector-controlled AC drives. |
| Conversion Time | 2.4 µs per channel - enables maximum throughput of 100 kSPS for all four channels, sufficient for 50/60 Hz power system harmonics up to 49th order. |
| Input Range | 0 V to 2.5 V or 0 V to 5 V - supports direct interfacing with unipolar sensors (e.g., current shunts, temperature transducers) without level-shifting circuitry. |
| Relative Accuracy (INL) | ±1.5 LSB max - ensures monotonicity and <0.01% full-scale linearity error over –40°C to +85°C, meeting IEC 61000-4-30 Class A metering requirements. |
| Power Dissipation | 100 mW typical - enables thermal management in dense PCB layouts without forced air cooling in industrial PLC modules. |
| SNR @ 100 kHz | 77 dB min - provides >12.8 effective number of bits (ENOB) for clean digitization of medium-frequency control loop signals. |
Pinout & Package
The AD7865ASZ-2REEL is housed in a 44-lead Plastic Quad Flatpack (PQFP) measuring 10 mm × 10 mm with 0.8 mm lead pitch. Thermal impedance θJA is 95°C/W; recommended decoupling includes 0.1 µF capacitors on AVDD, DVDD, VREF, and VDRIVE pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start Input | Rising-edge-triggered global sample command - simultaneously freezes all four track/holds and latches channel selection mode (H/S SEL state). |
| EOC | End-of-Conversion Output | Active-low pulse per channel - signals availability of each 14-bit result during sequence, enabling pipelined read operations. |
| BUSY | Busy Status Output | High during entire conversion sequence - indicates when all selected channels are complete and track/holds return to tracking mode. |
| DB0–DB13 | Parallel Data Bus | Three-state TTL outputs - deliver straight-binary-coded results; DB0 = LSB, DB13 = MSB; compatible with 3 V or 5 V microcontrollers via VDRIVE pin. |
| H/S SEL | Hardware/Software Select | Logic-level control - selects between SL1–SL4 pin-based channel enable (low) or DB0–DB3 register-based sequencing (high). |
| VIN1A/VIN1B to VIN4A/VIN4B | Differential Analog Inputs | Eight-pin differential pair layout - supports four fully isolated input channels with ±18 V overvoltage tolerance on AD7865ASZ-2REEL's unipolar configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling | Four independent track/hold amplifiers with ≤4 ns aperture delay matching - preserves phase relationships between voltage, current, and position feedback in servo drives. |
| Flexible Channel Sequencing | Hardware (SL1–SL4) or software (DB0–DB3 register) selection - allows dynamic reconfiguration of active channels without firmware reload in adaptive control systems. |
| Unipolar Straight-Binary Coding | Output format matches standard microcontroller arithmetic units - eliminates sign-extension logic and simplifies real-time FFT or PID computation. |
| Overvoltage Protected Inputs | Withstands –1 V to +18 V on any analog input - prevents latch-up or measurement corruption during transient events in UPS or grid-tie inverters. |
| 3 V Processor Interface Support | VDRIVE pin accepts 3 V ±10% supply - enables direct connection to ARM Cortex-M4/M7 or C2000 DSPs without level translators, reducing BOM count. |
Applications
| AC Motor Control | Uninterruptible Power Supply (UPS) |
|---|---|
Use Scenario: Real-time sensing of three-phase stator currents and DC bus voltage in field-oriented controlled (FOC) inverters. IC Role / Device Role / Timing Role: Simultaneous capture of current and voltage samples at PWM switching edges to compute instantaneous torque and flux vectors. Use Value: ≤4 ns inter-channel aperture matching ensures sub-degree phase accuracy in rotor position estimation, improving efficiency by ≥1.2% at partial load. | Use Scenario: Monitoring input AC line voltage, battery voltage, inverter output voltage, and load current during transfer switching. IC Role / Device Role / Timing Role: Four-channel synchronized acquisition for RMS calculation, harmonic analysis (up to 50th), and fast fault detection (<2 ms response). Use Value: 100 kSPS aggregate throughput enables 20 µs sampling interval - sufficient to detect zero-crossing anomalies and waveform distortion before transfer relay actuation. |
| Industrial Power Metering | Data Acquisition Systems |
Use Scenario: Class A energy meter design compliant with IEC 62053-22, measuring voltage, current, neutral current, and auxiliary sensor inputs. IC Role / Device Role / Timing Role: Simultaneous sampling of all current/voltage channels to eliminate time-skew errors in active/reactive power computation. Use Value: ±1.5 LSB INL and 77 dB SNR meet 0.2% accuracy requirement for billing-grade meters across temperature range –40°C to +85°C. | Use Scenario: Modular test equipment capturing vibration, temperature, pressure, and strain gauge outputs from rotating machinery. IC Role / Device Role / Timing Role: High-fidelity front-end digitizer with low-latency parallel interface for FPGA-based real-time spectral analysis. Use Value: 2.4 µs conversion time and FRSTDATA signaling allow deterministic data streaming at 350 kSPS per channel - enabling 16 kHz Nyquist bandwidth for bearing fault detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7656ASTZ | 6-channel, 16-bit, 2.5 µs conversion, ±10 V/±5 V bipolar only; no unipolar 0–5 V mode; uses SPI interface. | Requires external level-shifting for unipolar sensors; lacks native straight-binary output for 0–5 V range. | Select AD7656ASTZ only if 16-bit resolution and six channels outweigh loss of unipolar convenience and parallel interface speed. |
| ADS8588SIPM | 8-channel, 16-bit, 2.2 µs conversion, 0–5 V input; LVDS/parallel dual-mode interface; 1.8 V/3.3 V I/O support. | Higher channel count and resolution but requires separate 1.8 V supply; no integrated reference; larger 64-pin HTQFP package. | Choose ADS8588SIPM for next-gen systems needing >4 channels or lower power (65 mW), accepting added layout complexity and supply sequencing. |
Compared with AD7865ASZ-2REEL, AD7656ASTZ trades unipolar simplicity and parallel speed for higher resolution and channel count, while ADS8588SIPM offers greater scalability at the cost of supply rail complexity and footprint size - AD7865ASZ-2REEL remains optimal for cost-sensitive, space-constrained 4-channel unipolar acquisition.
Availability
AD7865ASZ-2REEL is available at Aetrix Electronics and suitable for AC motor control, uninterruptible power supplies, and industrial power metering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7865ASZ-2REEL 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The AD7865 product line was designed for industrial real-time data acquisition where phase-coherent multi-channel sampling, low power, and robust operation in harsh environments are mandatory - targeting motor drives, power quality analyzers, and automated test equipment.
FAQ
What input voltage ranges does the AD7865ASZ-2REEL support?
The AD7865ASZ-2REEL supports unipolar analog input ranges of 0 V to 2.5 V and 0 V to 5 V only. It does not support bipolar ranges (e.g., ±10 V or ±2.5 V); those are handled by other variants like AD7865ASZ-1 or AD7865ASZ-3. Input overvoltage tolerance is –1 V to +18 V per channel, protecting against transients without affecting adjacent channel conversions. This makes AD7865ASZ-2REEL ideal for direct connection to shunt-based current sensors and resistive voltage dividers in power electronics.
How does the AD7865ASZ-2REEL achieve simultaneous sampling across four channels?
The AD7865ASZ-2REEL achieves true simultaneous sampling using four independent on-chip track/hold amplifiers - one per differential input pair (VIN1A/B through VIN4A/B). A single CONVST rising edge places all four into hold mode at the exact same instant, freezing analog inputs coherently. Aperture delay matching is guaranteed ≤4 ns, ensuring phase alignment critical for vector control algorithms. The subsequent ADC conversion proceeds sequentially across selected channels, but sampling itself is strictly simultaneous - a feature confirmed in the AD7865ASZ-2REEL functional block diagram and timing specifications.
What is the output data format of the AD7865ASZ-2REEL?
The AD7865ASZ-2REEL outputs data in straight (natural) binary format - not two's complement - because it is configured for unipolar input ranges (0 V to 2.5 V or 0 V to 5 V). DB13 is the MSB, DB0 is the LSB, and all 14 bits represent unsigned magnitude. This eliminates sign-extension logic in host processors and simplifies scaling calculations in real-time control loops. The output coding is explicitly defined in the AD7865ASZ-2REEL datasheet's "Logic Outputs" section and verified in the ordering guide model suffix "-2".
Can the AD7865ASZ-2REEL interface directly with a 3 V microcontroller?
Yes, the AD7865ASZ-2REEL can interface directly with 3 V microcontrollers using its VDRIVE pin, which powers the DB0–DB13 data bus, BUSY, EOC, and FRSTDATA outputs. When VDRIVE is supplied with 3 V ±10%, the digital outputs comply with 3 V TTL logic levels (VOH ≥ 2.4 V, VOL ≤ 0.4 V), eliminating level-shifters. This capability is documented in the AD7865ASZ-2REEL's "Logic Outputs" specifications and "VDRIVE" pin description, and is functionally identical across all AD7865 variants.
What is the maximum throughput rate of the AD7865ASZ-2REEL when using all four channels?
The AD7865ASZ-2REEL achieves a maximum throughput rate of 100 kSPS when converting all four channels - meaning one complete set of four 14-bit samples every 10 µs. This is calculated from the 2.4 µs per-channel conversion time multiplied by four channels (9.6 µs), plus overhead. The value is explicitly stated in the AD7865ASZ-2REEL datasheet under "CONVERSION RATE" and confirmed in timing Figure 6. For single-channel operation, throughput reaches 350 kSPS, but full four-channel synchronization caps at 100 kSPS to preserve simultaneity and timing integrity.
AD7865ASZ-2REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 44-QFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 350k
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-MUX-ADC
- Ratio - S/H:ADC:
- 4:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 44-MQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7865ASZ-2REEL FAQ
1.How can I place an order for AD7865ASZ-2REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7865ASZ-2REEL 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 AD7865ASZ-2REEL reliable?
The price and inventory of AD7865ASZ-2REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7865ASZ-2REEL is usually 5 days.
3.What payment methods are accepted for AD7865ASZ-2REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7865ASZ-2REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7865ASZ-2REEL?
AD7865ASZ-2REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7865ASZ-2REEL 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 AD7865ASZ-2REEL?
For technical support, including AD7865ASZ-2REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7865ASZ-2REEL requirements.
6.How does Aetrix verify that AD7865ASZ-2REEL is sourced from the original manufacturer or authorized distributors?
All AD7865ASZ-2REEL 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 AD7865ASZ-2REEL meets industry standards.
7.What is the process for return or replacement of AD7865ASZ-2REEL?
All AD7865ASZ-2REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7865ASZ-2REEL, 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 AD7865ASZ-2REEL part is unused and in its original packaging.
Return procedure for AD7865ASZ-2REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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