Analog Devices Inc. AD7865YS-3

Overview

AD7865YS-3 from Analog Devices is a four-channel, simultaneous-sampling, 14-bit analog-to-digital converter (ADC) operating from a single 5 V supply. It features four integrated track/hold amplifiers, internal 2.5 V reference, and ±2.5 V bipolar input range with ±2 LSB relative accuracy over –40°C to +105°C. Its 2.4 µs conversion time per channel and 0.35 µs track/hold acquisition enable high-fidelity phase-coherent sampling in motor control and power monitoring systems.

For engineers reviewing the AD7865YS-3 datasheet, AD7865YS-3 pinout, AD7865YS-3 application, or AD7865YS-3 equivalent, this page delivers verified specifications including aperture delay matching (≤4 ns), SNR (77 dB min), THD (–86 dB max), channel-to-channel isolation (–88 dB), and parallel interface timing for microcontroller/DSP interfacing.

Technical Context

The AD7865YS-3 implements a successive approximation ADC architecture with four independent track/hold amplifiers sharing a common internal clock oscillator. All four channels sample simultaneously on the rising edge of CONVST, preserving inter-channel phase relationships critical for vector control and power quality analysis.

Conversion sequencing is configurable via hardware (SL1–SL4 pins) or software (channel select register via DB0–DB3), supporting partial-channel conversion to maximize throughput. The device supports both internal clock operation and external 5 MHz clock input, with BUSY and EOC signals providing precise status feedback for real-time system synchronization.

Key Specifications

Pinout & Package

The AD7865YS-3 is housed in a 44-lead Plastic Quad Flatpack (PQFP) package with 0.8 mm lead pitch and 10 mm × 10 mm body size. Pin 1 is marked by a corner notch; thermal pad is not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar simultaneous-sampling ADC applications.

Compared with AD7865YS-3, AD7656ASTZ offers higher resolution and channel count but lacks internal reference and parallel interface simplicity, while ADS8588HIPM provides greater scalability at the cost of power and package size - AD7865YS-3 remains optimal for compact, low-power, phase-critical four-channel designs.

Availability

AD7865YS-3 is available at Aetrix Electronics and suitable for motor control systems, uninterruptible power supplies, industrial power meters, and data acquisition systems requiring stable component supply across extended temperature ranges.

Supply support for AD7865YS-3 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, serving industrial, automotive, communications, and healthcare markets.

The AD7865 product line delivers simultaneous-sampling ADCs optimized for real-time control and power measurement applications where inter-channel timing integrity is non-negotiable.

FAQ

What is the operating temperature range of the AD7865YS-3?

The AD7865YS-3 is rated for operation from –40°C to +105°C, making it suitable for under-hood automotive applications and industrial environments with elevated ambient temperatures. This Y-grade qualification exceeds commercial-grade (A/B) versions and is validated across all electrical specifications including SNR, THD, and INL.

Does the AD7865YS-3 require an external reference voltage?

No, the AD7865YS-3 includes an internal 2.5 V reference with ±20 mV error over temperature, sufficient to achieve its specified ±2 LSB relative accuracy. The VREF pin can be overdriven with an external 2.5 V ±5% source if higher precision is required, but this is optional - the AD7865YS-3 functions fully self-contained.

How does the AD7865YS-3 handle channel selection during conversion?

The AD7865YS-3 supports dual-mode channel selection: hardware mode (via SL1–SL4 pins) or software mode (via channel select register written through DB0–DB3). In either case, the selection is latched on the rising edge of CONVST, ensuring deterministic behavior. This flexibility allows seamless integration with both FPGA-based and microcontroller-based systems.

What is the significance of aperture delay matching in the AD7865YS-3?

The AD7865YS-3 guarantees ≤4 ns maximum aperture delay matching between its four track/hold amplifiers. This specification ensures that sampled waveforms retain their true phase relationships - critical for vector-controlled motor drives and three-phase power analysis where even 0.1° phase error degrades control stability or measurement accuracy.

Can the AD7865YS-3 interface directly with 3 V microcontrollers?

Yes, the AD7865YS-3 supports 3 V logic interfacing via the VDRIVE pin, which powers the DB0–DB13 data outputs, BUSY, EOC, and FRSTDATA signals. When VDRIVE is supplied with 3 V ±10%, the outputs meet 3 V TTL thresholds while maintaining full 14-bit performance - eliminating level-shifter components in mixed-voltage systems.