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Analog Devices Inc. AD7865ASZ-2
- Part No.:
- AD7865ASZ-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 44-QFP
- Datasheet:
-
AD7865ASZ-2.pdf
- Description:
- IC ADC 14BIT SAR 44MQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,554
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Product details
Overview
AD7865ASZ-2 from Analog Devices is a four-channel, simultaneous-sampling, 14-bit 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 in normal mode, and delivers 77 dB SNR at 100 kHz input - optimized for real-time motor control and industrial power monitoring.
For engineers reviewing the AD7865ASZ-2 datasheet, AD7865ASZ-2 pinout, AD7865ASZ-2 application, or AD7865ASZ-2 equivalent, this page provides verified technical context, exact pin functions, confirmed unipolar-range performance specs, and two validated alternative parts for systems requiring simultaneous 4-channel sampling with sub-100 ns aperture delay matching.
Technical Context
The AD7865ASZ-2 integrates four matched track/hold amplifiers and a successive approximation ADC core, enabling true simultaneous sampling across all four analog inputs to preserve phase coherence. Its internal 2.5 V reference, on-chip clock oscillator, and hardware/software channel selection logic support deterministic timing control via CONVST-triggered latching.
It supports dual read modes: sequential reads during conversion (using EOC strobes) or batch reads after full sequence completion (using BUSY deassertion). The parallel 14-bit interface operates with 3 V or 5 V logic levels via VDRIVE pin configuration, and aperture delay matching is specified at ≤4 ns max between channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete output codes for high-fidelity signal digitization. |
| Conversion Time | 2.4 µs max per channel - enables up to 350 kSPS single-channel throughput or 100 kSPS full 4-channel simultaneous rate. |
| Input Range | 0 V to 2.5 V or 0 V to 5 V - unipolar operation compatible with sensor outputs and DAC-driven signal chains. |
| SNR | 77 dB min at fIN = 100 kHz - ensures ≥12.5 effective bits for precision measurement applications. |
| Aperture Delay Matching | ≤4 ns max - preserves inter-channel phase integrity critical for vector-controlled AC drives and multi-phase power analysis. |
| Power Dissipation | 100 mW typical (normal mode), 15 µW typical (standby) - suitable for thermally constrained embedded systems. |
| Reference | Internal 2.5 V ±20 mV - eliminates external reference component count while supporting overdrive via VREF pin. |
Pinout & Package
AD7865ASZ-2 is housed in a 44-lead Plastic Lead Quad Flatpack (PQFP), 10 mm × 10 mm body, 0.8 mm lead pitch, JEDEC MO-152AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BUSY (Pin 1) | Conversion status indicator | Active-high signal remains asserted until all selected channels complete conversion - used for synchronous data capture coordination. |
| CONVST (Pin 3) | Start-of-conversion trigger | Rising-edge–sensitive input that simultaneously freezes all four track/holds and latches channel selection - defines absolute timing origin for sampling. |
| EOC (Pin 44) | Per-channel conversion flag | Active-low pulse marks completion of each individual channel's conversion - enables pipelined read operations without waiting for full sequence. |
| DB0–DB13 (Pins 38–43, 27–34) | Parallel data bus | 14-bit straight binary output (AD7865ASZ-2) - MSB-first, three-state TTL-compatible, supports 3 V or 5 V interfacing via VDRIVE pin. |
| H/S SEL (Pin 11) | Control mode selector | Logic-high enables software-configured channel sequencing via DB0–DB3; logic-low enables hardware-selectable channels via SL1–SL4 pins. |
| VREF (Pin 24) | Reference I/O | Provides access to internal 2.5 V reference; accepts external 2.5 V ±5% source - enables system-level reference calibration or noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 4-channel sampling | Preserves phase relationships across inputs - essential for vector control, power quality analysis, and multi-sensor synchronization. |
| Hardware/software channel selection | Enables fixed-sequence operation (SL1–SL4) or dynamic reconfiguration (channel select register) - reduces firmware overhead in adaptive systems. |
| Sub-100 ns aperture delay matching | ≤4 ns max mismatch ensures <0.02° phase error at 100 kHz - meets IEC 61000-4-30 Class A requirements for power metering. |
| Overvoltage-tolerant analog inputs | Withstands –1 V to +18 V on VINx pins - protects against transients in industrial motor drive feedback paths without external clamping. |
| 3 V/5 V flexible I/O interface | VDRIVE pin allows independent 3 V supply to digital outputs - simplifies integration with low-voltage microcontrollers and DSPs. |
Applications
| AC Motor Control | Industrial Power Monitoring |
|---|---|
|
Use Scenario: Real-time acquisition of three-phase current and DC bus voltage in servo drives. IC Role / Device Role / Timing Role: Simultaneous sampling ADC capturing synchronized waveforms to compute torque vector and detect fault conditions. Use Value: 4 ns aperture delay matching enables <0.02° phase accuracy at 1 kHz - critical for field-oriented control loop stability. |
Use Scenario: Multi-point voltage/current measurement in DIN-rail power meters for energy billing compliance. IC Role / Device Role / Timing Role: Four-channel front-end digitizer acquiring line-to-line voltages and neutral current with coherent timing. Use Value: 77 dB SNR at 100 kHz supports Class A accuracy per IEC 62053-22, eliminating need for external averaging or filtering. |
| Uninterruptible Power Supply (UPS) | Data Acquisition Systems |
|
Use Scenario: Input/output waveform capture during transfer switching and battery discharge events. IC Role / Device Role / Timing Role: Simultaneous sampling of AC input, inverter output, and battery voltage to detect zero-crossing misalignment. Use Value: 2.4 µs conversion time enables 100 kSPS full 4-channel throughput - sufficient for 50/60 Hz harmonic analysis up to 40th order. |
Use Scenario: Modular test equipment capturing transient signals from vibration sensors, temperature arrays, and strain gauges. IC Role / Device Role / Timing Role: High-speed, low-power ADC serving as universal analog front-end with configurable unipolar input scaling. Use Value: 0.35 µs track/hold acquisition time allows clean step-response capture after channel switching - improves dynamic range in multiplexed systems. |
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. | Requires external level-shifting for unipolar sensor interfaces; higher resolution but incompatible input range. | Select when 16-bit resolution and 6-channel count outweigh input range mismatch and higher power (140 mW). |
| ADS8588HIPM | 8-channel, 16-bit, 2.8 µs conversion, 0–5 V unipolar support; SPI interface only, no parallel bus. | Eliminates parallel bus routing but increases CPU overhead; lacks EOC/BUSY handshaking signals. | Select for space-constrained designs needing >4 channels and SPI compatibility, accepting firmware-driven timing control. |
Compared with AD7865ASZ-2, AD7656ASTZ offers higher resolution and channel count but lacks native 0–5 V support, while ADS8588HIPM provides greater channel density and unipolar compatibility at the cost of parallel interface removal and increased software complexity.
Availability
AD7865ASZ-2 is available at Aetrix Electronics and suitable for AC motor control, industrial power monitoring, and uninterruptible power supply applications requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for AD7865ASZ-2 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 AD7865 product line was designed specifically for industrial automation and power electronics systems demanding simultaneous multi-channel sampling, tight aperture matching, and robust operation in electrically noisy environments.
FAQ
What input voltage ranges does the AD7865ASZ-2 support?
The AD7865ASZ-2 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 like ±10 V or ±2.5 V - those are handled by the AD7865ASZ-1 and AD7865ASZ-3 variants. Input current is ≤10 µA at 2.5 V range and ≤1 mA at 5 V range, ensuring minimal loading on signal sources.
How does the AD7865ASZ-2 achieve simultaneous sampling across four channels?
The AD7865ASZ-2 achieves true simultaneous sampling using four independent, tightly matched track/hold amplifiers - one per analog input pair (VIN1A/VIN1B through VIN4A/VIN4B). All four track/holds enter hold mode on the same rising edge of the CONVST signal, freezing input voltages at identical instants with ≤4 ns aperture delay mismatch - preserving phase coherence for multi-signal analysis.
What is the role of the VDRIVE pin on the AD7865ASZ-2?
The VDRIVE pin on the AD7865ASZ-2 supplies power to the digital output drivers (DB0–DB13, BUSY, EOC, FRSTDATA), allowing independent biasing from DVDD. It enables direct interfacing with 3 V processors by applying 3 V ±10% to VDRIVE while maintaining 5 V on DVDD/AVDD - no level shifters required. A 0.1 µF decoupling capacitor is mandatory between VDRIVE and DGND.
Does the AD7865ASZ-2 include an internal voltage reference?
Yes, the AD7865ASZ-2 includes an internal 2.5 V reference with ±20 mV error over temperature, accessible at the VREF pin. This reference can be overdriven by an external 2.5 V ±5% source for improved accuracy or noise performance. A 0.1 µF decoupling capacitor must be placed between VREF and AGND to ensure stability and low-noise operation.
What is the maximum throughput rate when using all four channels of the AD7865ASZ-2?
The AD7865ASZ-2 achieves a maximum throughput rate of 100 kSPS when converting all four channels simultaneously - calculated as 1 / (4 × 2.4 µs) = 104.2 kSPS, derated to 100 kSPS in datasheet specifications to guarantee timing margins. For single-channel operation, throughput reaches 350 kSPS, limited by the 2.4 µs conversion time and 0.35 µs acquisition time.
AD7865ASZ-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 44-QFP
- Packaging:
- Tray
- 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-2 FAQ
1.How can I place an order for AD7865ASZ-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7865ASZ-2 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-2 reliable?
The price and inventory of AD7865ASZ-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7865ASZ-2 is usually 5 days.
3.What payment methods are accepted for AD7865ASZ-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7865ASZ-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7865ASZ-2?
AD7865ASZ-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7865ASZ-2 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-2?
For technical support, including AD7865ASZ-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7865ASZ-2 requirements.
6.How does Aetrix verify that AD7865ASZ-2 is sourced from the original manufacturer or authorized distributors?
All AD7865ASZ-2 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-2 meets industry standards.
7.What is the process for return or replacement of AD7865ASZ-2?
All AD7865ASZ-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7865ASZ-2, 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-2 part is unused and in its original packaging.
Return procedure for AD7865ASZ-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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