AD7865YSZ-1 - 14-Bit 350kSPS Quad Simultaneous-Sampling ADC | ADI
MPN: AD7865YSZ-1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $32.5 | $32.50 |
| 10 | $29.3 | $293.00 |
| 100 | $25.85 | $2,585.00 |
| 500 | $22.4 | $11,200.00 |
| 1,000 | $19.95 | $19,950.00 |
AD7865YSZ-1 Overview
What is a simultaneous-sampling SAR ADC? A simultaneous-sampling ADC integrates one track-and-hold amplifier per channel so that all four input signals are captured at exactly the same instant; this preserves phase relationships in multi-phase systems such as three-phase motor control or four-quadrant power monitoring. SAR architecture delivers deterministic latency and no pipeline delay, which makes the AD7865 well suited to closed-loop control where conversion determinism is critical.
The device integrates four track/hold amplifiers, a 2.5 V on-chip reference, an on-chip clock oscillator, signal-conditioning input scalers, and a high-speed parallel microprocessor-compatible interface. Hardware or software selection of input channels (VIN1..VIN4) lets the user convert all four channels simultaneously, or sequence through them under software control. Power consumption is typically 115 mW at full throughput, dropping under software power-down for portable or battery-backed applications.
Typical applications include AC motor control and three-phase power metering, data acquisition systems for industrial process control, multiphase vibration and inertial measurement, instrumentation and medical imaging front-ends, and any multi-channel control loop where phase coherence between channels is required. The wide ±10 V input range also suits direct connection to current shunts and transducer bridges after scaling.
When designing with this part, observe the analog input common-mode and ESD handling rules in the AD7865 datasheet, keep the analog/digital grounds separated at a single point, and respect the 44-MQFP thermal envelope when operating at the full 350 kSPS throughput at elevated ambient temperatures.
Drop-in alternatives for AD7865YSZ-1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7865YSZ-2
✅ Drop-In📋 Reference alternative (not in catalog)
AD7865ASZ-1
✅ Drop-In📋 Reference alternative (not in catalog)
AD7865ASZ-2
✅ Drop-In📋 Reference alternative (not in catalog)
AD7865BSZ-1
✅ Drop-In📋 Reference alternative (not in catalog)
AD7865YSZ-1 Maximum Ratings & Electrical Characteristics
| Resolution | 14 bit |
| Architecture | SAR with 4 Track/Hold amplifiers |
| Number of Channels | 4 (simultaneous sampling) |
| Sampling Rate | 350 kSPS per channel |
| Conversion Time | 2.4 us per channel |
| Track/Hold Acquisition Time | 0.35 us |
| Input Voltage Range (AD7865YSZ-1) | +/-10 V or 0 V to +5 V (bipolar) |
| Supply Voltage | +5 V single supply |
| On-chip Reference | 2.5 V |
| Data Interface | Parallel |
| On-chip Clock Oscillator | Yes |
| Input Selection | Hardware or software channel select |
| Power Dissipation (typical) | 115 mW at full throughput |
| Operating Temperature Range | -40C to +105C |
| Package | 44-pin MQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Packaging | Tray |
| RoHS Status | Compliant |
AD7865YSZ-1 Pin Configuration
| Pin 1 | DB13 — Parallel data output bit 13 (MSB) |
| Pin 2 | DB12 — Parallel data output bit 12 |
| Pin 3 | DB11 — Parallel data output bit 11 |
| Pin 4 | DB10 — Parallel data output bit 10 |
| Pin 5 | DB9 — Parallel data output bit 9 |
| Pin 6 | DB8 — Parallel data output bit 8 |
| Pin 7 | DB7 — Parallel data output bit 7 |
| Pin 8 | DB6 — Parallel data output bit 6 |
| Pin 9 | DB5 — Parallel data output bit 5 |
| Pin 10 | DB4 — Parallel data output bit 4 |
| Pin 11 | DB3 — Parallel data output bit 3 |
| Pin 12 | DB2 — Parallel data output bit 2 |
| Pin 13 | DB1 — Parallel data output bit 1 |
| Pin 14 | DB0 — Parallel data output bit 0 (LSB) |
| Pin 15 | DGND — Digital ground |
| Pin 16 | VDD — +5 V digital supply |
| Pin 17 | /CS — Chip select (active low) |
| Pin 18 | /RD — Read strobe (active low) |
| Pin 19 | /WR — Write/convert start (active low) |
| Pin 20 | EOC — End of conversion interrupt |
| Pin 21 | AGND — Analog ground |
| Pin 22 | VIN1 — Analog input channel 1 |
| Pin 23 | VIN2 — Analog input channel 2 |
| Pin 24 | VIN3 — Analog input channel 3 |
| Pin 25 | VIN4 — Analog input channel 4 |
| Pin 26 | AGND — Analog ground |
| Pin 27 | REFIN — Reference input (decoupled to REFGND) |
| Pin 28 | REFOUT — Internal 2.5 V reference output |
| Pin 29 | REFGND — Reference ground |
| Pin 30 | RANGE — Input range select (bipolar/unipolar) |
| Pin 31 | A0 — Channel address input 0 (HW/SW mode) |
| Pin 32 | A1 — Channel address input 1 (HW/SW mode) |
| Pin 33 | MODE — Hardware/software channel select |
| Pin 34 | PWDN — Power-down input |
| Pin 35 | NC — Not connected (per datasheet) |
| Pin 36 | NC — Not connected (per datasheet) |
| Pin 37 | NC — Not connected (per datasheet) |
| Pin 38 | NC — Not connected (per datasheet) |
| Pin 39 | AGND — Analog ground |
| Pin 40 | VDD — +5 V analog supply |
| Pin 41 | AGND — Analog ground |
| Pin 42 | AGND — Analog ground |
| Pin 43 | AGND — Analog ground |
| Pin 44 | DGND — Digital ground |
Typical Applications
AD7865YSZ-1 is suitable for 6 applications: Three-Phase Motor Control, Power Quality and Energy Metering, Industrial Data Acquisition Systems, Medical Imaging and Instrumentation, Vibration and Inertial Measurement, Closed-Loop Control and Process Control.
Three-Phase Motor Control
The AD7865YSZ-1's four-channel simultaneous sampling is critical for field-oriented control (FOC) of three-phase AC motors and brushless DC drives. By latching all three phase currents plus DC bus voltage at exactly the same instant with the on-chip track-and-hold amplifiers, the device preserves the phase relationships that Clarke/Park transforms depend on for accurate rotor-flux estimation. The 2.4 us conversion time per channel and 350 kSPS per-channel throughput support PWM frequencies up to ~20 kHz with margin for current-loop control rates of 10 kHz. The +/-10 V input range of the -1 variant directly accepts current-shunt amplifier outputs (e.g. AD8205) without additional signal conditioning, simplifying PCB layout and reducing BOM. The parallel interface delivers converted data with deterministic latency, eliminating pipeline-delay uncertainty that complicates PID tuning in high-dynamic-range servo loops.
Recommended
Power Quality and Energy Metering
The AD7865YSZ-1 enables accurate three-phase (or four-quadrant) power metering by simultaneously sampling voltage and current waveforms on all phases. The 14-bit resolution and 350 kSPS throughput are sufficient for Class 0.5 power-meter accuracy when paired with calibrated current transformers and burden resistors. The on-chip 2.5 V reference and on-chip clock oscillator reduce drift and BOM, while the parallel interface simplifies connection to MCUs or DSPs that compute RMS, real power, and reactive power per phase. The +/-10 V input range of the -1 variant accepts direct PT/CT outputs without external attenuators in 230 V/400 V systems, reducing analog-front-end complexity. Hardware channel selection allows the MCU to wake the chip, take samples, and return to low-power mode between conversions, supporting battery-backed metering nodes.
Recommended
Industrial Data Acquisition Systems
The AD7865YSZ-1 is a strong fit for multi-channel industrial DAQ front-ends where four sensors must be sampled at exactly the same instant to preserve correlation. Examples include four-quadrant load-cell bridges for force-torque sensors, four-channel strain-gauge amplifiers for structural-health monitoring, and parallel-channel temperature or pressure telemetry. The on-chip signal-conditioning input scalers accept +/-10 V or 0-5 V bipolar signals directly from instrumentation amplifiers, eliminating external resistor networks. With 350 kSPS per channel, the part supports vibration analysis on rotating machinery up to ~80 kHz Nyquist bandwidth per channel when channels are time-interleaved. The 44-MQFP package gives robust mechanical and thermal performance in industrial enclosures, and the -40C to +105C operating temperature range covers most factory-floor environments.
Recommended
Medical Imaging and Instrumentation
The AD7865YSZ-1 supports medical instrumentation front-ends such as patient-monitoring multi-lead ECG, multi-channel electrophysiology, and ultrasound receive-beamformer pre-digitization stages. Simultaneous sampling across four channels eliminates skew artifacts that would otherwise distort ECG morphology or introduce beamformer pointing errors in phased-array ultrasound. The 14-bit resolution is sufficient for monitoring-class ECG and many ultrasound receive channels after Time-Gain Compensation; the 350 kSPS per-channel rate supports sampling rates well above the audio bandwidth needed for diagnostic-quality recordings. The on-chip 2.5 V reference provides stable conversion gain over time and temperature, important for calibrated medical measurements. The parallel interface simplifies connection to DSPs (e.g. SHARC) that perform real-time signal processing.
Recommended
Vibration and Inertial Measurement
Simultaneous sampling of four accelerometer or gyroscope outputs is essential for inertial measurement units (IMUs) and multi-axis vibration analysis. The AD7865YSZ-1 captures all four channels at the same instant with 0.35 us track/hold acquisition, preserving cross-axis phase relationships that would otherwise be lost in time-interleaved converters. The 14-bit resolution and 350 kSPS per channel are well matched to MEMS accelerometers and gyroscopes used in industrial vibration monitoring, robotics, and drone flight control. The on-chip clock oscillator eliminates external clock components and reduces EMI susceptibility. The +/-10 V input range of the -1 variant accepts amplified transducer outputs directly, simplifying signal-chain design. The parallel interface allows direct DMA into microcontrollers or DSPs for real-time FFT and modal-analysis processing.
Recommended
Closed-Loop Control and Process Control
The AD7865YSZ-1 suits closed-loop process-control applications where multiple analog sensors must be read at the same instant to maintain accurate control-loop timing. Examples include four-channel hydraulic or pneumatic actuator position sensing, multi-point temperature profiling with synchronized sample times, and high-speed process monitoring. The 2.4 us conversion time per channel and deterministic SAR latency allow the controller to act on freshly-converted data within a single control cycle, improving loop bandwidth. Hardware or software channel selection lets the controller choose between full simultaneous sampling and lower-power single-channel conversion when throughput requirements relax. The 115 mW typical power dissipation and the ability to enter software power-down between conversions support thermally-constrained or battery-backed installations.
Recommended
Recommended Products Summary
Engineering reference data for AD7865YSZ-1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7865YSZ-2 | AD7865ASZ-1 | AD7865ASZ-2 | AD7865BSZ-1 |
|---|---|---|---|---|---|
| Package | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit |
| Channels (simultaneous sampling) | 4 | 4 | 4 | 4 | 4 |
| Sampling Rate (per channel) | 350 kSPS | 350 kSPS | 350 kSPS | 350 kSPS | 350 kSPS |
| Conversion Time | 2.4 us | 2.4 us | 2.4 us | 2.4 us | 2.4 us |
| Input Voltage Range | +/-10 V or 0 to +5 V (bipolar) | +/-5 V or 0 to +5 V (bipolar) | +/-10 V or 0 to +5 V (bipolar) | +/-5 V or 0 to +5 V (bipolar) | Bipolar variant |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Operating Temperature | -40C to +105C | -40C to +105C | -40C to +85C | -40C to +85C | -40C to +105C |
| Data Interface | Parallel | Parallel | Parallel | Parallel | Parallel |
Key Differentiators
- True 4-channel simultaneous sampling at 350 kSPS per channel (vs AD7606 family (e.g. AD7606C-16BSTZ))
- Wide +/-10 V or 0-5 V bipolar input range without external scaling (vs AD7865ASZ-1 vs ASZ-2)
- Single +5 V supply and on-chip clock oscillator reduce BOM (vs Discrete ADC + external reference + external clock designs)
Design Notes
Separate the analog and digital ground planes and join them at a single point near the AGND pin of the AD7865YSZ-1 to prevent digital switching currents from coupling into the analog front end. Place the 0.1 uF +5 V decoupling capacitor as close as possible to each VDD pin, with a bulk 10 uF tantalum or ceramic cap on the same supply node. The REFIN/REFOUT pins must be decoupled to REFGND (not AGND) with a low-ESR 10 uF capacitor and a 0.1 uF ceramic in parallel, per the AD7865 datasheet reference-decoupling recommendation. Keep analog input traces short and routed away from digital outputs DB0..DB13 and the parallel interface control signals to minimize digital-to-analog crosstalk. Maintain a guard ring around the four VIN pins if the PCB layout places noisy digital traces nearby.
Do not drive the analog inputs beyond +/-25 V or apply ESD beyond the absolute-maximum ratings specified in the AD7865 datasheet; the bipolar +/-10 V range uses on-chip thin-film resistors that lack the protection of a dedicated front-end driver. Ensure the /WR signal is a clean digital edge - ringing on /WR at the start of conversion can degrade SNR. In software-mode operation the channel-selection logic must be re-programmed before each conversion cycle; otherwise the part re-converts the previously addressed channel. The PWDN pin must be held low for at least 10 us to ensure clean wake-up, and the first conversion after power-down should be discarded because internal bias nodes have not settled.
For three-phase motor control or power-metering applications, sample all four channels simultaneously by triggering the conversion in hardware-mode with all channel-select pins tied high (or by software-mode sequential writes). The on-chip 2.5 V reference is shared across all four channels, so any reference noise couples identically into all conversions - decouple REFOUT carefully and avoid injecting switching currents into the reference node. The 350 kSPS throughput is per channel; aggregate four-channel throughput is approximately 100 kSPS at maximum rate. For applications that need higher per-channel bandwidth, consider the AD7606 family (e.g. AD7606C-16BSTZ or AD7606C-18BSTZ on the XAIPART Site MPN list), which delivers 8 channels of 16/18-bit simultaneous sampling at 1 MSPS.
Compliance Information
RoHS and REACH compliance per Analog Devices product page. Not AEC-Q100 qualified - this is an industrial-grade part. Lead-free (Pb-free) per MQFP package specifications.
