AD7865BSZ-2 - 14-Bit 4-Ch Simultaneous-Sampling 350kSPS ADC | ADI
MPN: AD7865BSZ-2 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $17.62 | $17.62 |
| 10 | $16.45 | $164.50 |
| 100 | $14.92 | $1,492.00 |
| 500 | $13.78 | $6,890.00 |
| 1,000 | $12.95 | $12,950.00 |
AD7865BSZ-2 Overview
A SAR (successive-approximation register) ADC is a type of Nyquist-rate converter that resolves one bit per clock cycle using an internal binary-search algorithm against a precision DAC; compared with delta-flush, flash, or pipeline ADCs, SAR converters are favored when high absolute DC precision, low latency, and low power dissipation must coexist. As a member of the broader data-converter category, the AD7865 belongs to the simultaneous-sampling ADC class used where multiple signals must be digitized at exactly the same instant - critical for phase-sensitive power, motor-control, and instrumentation applications. The simultaneous-sampling architecture eliminates the inter-channel phase error that plagues multiplexed-input ADCs in multi-phase systems.
The AD7865BSZ-2 achieves 14-bit no-missing-code performance with 0.35 µs track-and-hold acquisition time, 80 dB SNR at 50 kHz input, and HW/SW-selectable bipolar input ranges (±5 V / ±10 V). The on-chip 2.5 V reference eliminates an external precision reference, and the high-speed parallel interface supports direct connection to DSPs, microcontrollers, and FPGAs. Compared with multiplexed multi-channel ADCs, the four simultaneous track-and-hold amplifiers preserve phase relationships between channels, which is essential for vector measurements in power-control loops and three-phase motor drives.
Typical applications include three-phase motor control and inverter feedback, multi-axis industrial servo systems, simultaneous AC-line voltage and current monitoring, data-acquisition front ends for ±10 V industrial signal chains, power-quality and power-metering analyzers, and vibration/acoustic instrumentation. The wide bipolar input range allows direct digitization of industrial ±10 V signals without external signal conditioning.
When designing with the AD7865BSZ-2, place the recommended 0.1 µF and 10 µF decoupling capacitors as close as possible to AVDD/DVDD pins to maintain SNR. The parallel interface may require external bus-isolation resistors when driving long PCB traces or backplanes. For system-level calibration, allow a 1 µs settling window between successive conversions and avoid driving the track-and-hold inputs beyond the absolute maximum ratings during fault events.
This page synthesizes distributor pricing, drop-in AD7865-family alternatives, and practical design notes not found in the manufacturer datasheet, all aligned to the 2026-10-06 reference date.
Drop-in alternatives for AD7865BSZ-2 — 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:
AD7865BSZ-1
✅ Drop-In📋 Reference alternative (not in catalog)
AD7865BSZ-3
✅ Drop-In📋 Reference alternative (not in catalog)
AD7865BSZ-1REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7865BS-1
✅ Drop-In📋 Reference alternative (not in catalog)
AD7865BSZ-2 Maximum Ratings & Electrical Characteristics
| Resolution | 14 bits |
| Number of Channels | 4 |
| Architecture | SAR (Successive Approximation) |
| Sampling Rate | 350 kSPS per channel |
| Conversion Time per Channel | 2.4 µs |
| Track/Hold Acquisition Time | 0.35 µs |
| Input Type | Simultaneous sampling, bipolar (±5 V / ±10 V HW/SW selectable) |
| Input Range | ±5 V or ±10 V |
| Data Interface | Parallel |
| Supply Voltage | +5 V single supply |
| Internal Reference | 2.5 V (on-chip) |
| Number of Bits | 14 |
| Package / Case | 44-MQFP (10x10 mm) |
| Operating Temperature | -40 °C to +85 °C |
| Mounting Type | Surface Mount |
| Packaging | Tray |
AD7865BSZ-2 Pin Configuration
| Pin 1 | VINA — Analog input channel A (bipolar ±5 V / ±10 V) |
| Pin 2 | VINA — Analog input channel A (bipolar ±5 V / ±10 V) |
| Pin 3 | VINB — Analog input channel B (bipolar ±5 V / ±10 V) |
| Pin 4 | VINB — Analog input channel B (bipolar ±5 V / ±10 V) |
| Pin 5 | VINC — Analog input channel C (bipolar ±5 V / ±10 V) |
| Pin 6 | VINC — Analog input channel C (bipolar ±5 V / ±10 V) |
| Pin 7 | VIND — Analog input channel D (bipolar ±5 V / ±10 V) |
| Pin 8 | VIND — Analog input channel D (bipolar ±5 V / ±10 V) |
| Pin 9 | AGND — Analog ground |
| Pin 10 | REF — Reference input/output (2.5 V internal) |
| Pin 11 | REFGND — Reference ground |
| Pin 12 | AVDD — Analog supply (+5 V) |
| Pin 13 | AVDD — Analog supply (+5 V) |
| Pin 14 | AGND — Analog ground |
| Pin 15 | RANGE — Input range select / HW-SW range pin |
| Pin 16 | RANGE — Input range select / HW-SW range pin |
| Pin 17 | RANGE — Input range select / HW-SW range pin |
| Pin 18 | RANGE — Input range select / HW-SW range pin |
| Pin 19 | RANGE — Input range select / HW-SW range pin |
| Pin 20 | RANGE — Input range select / HW-SW range pin |
| Pin 21 | RANGE — Input range select / HW-SW range pin |
| Pin 22 | RANGE — Input range select / HW-SW range pin |
| Pin 23 | STBY — Standby mode input |
| Pin 24 | CONVST — Conversion start input |
| Pin 25 | BUSY — ADC busy output |
| Pin 26 | CS — Chip select input |
| Pin 27 | RD — Read input |
| Pin 28 | DGND — Digital ground |
| Pin 29 | DB0 — Parallel data output bit 0 (LSB) |
| Pin 30 | DB1 — Parallel data output bit 1 |
| Pin 31 | DB2 — Parallel data output bit 2 |
| Pin 32 | DB3 — Parallel data output bit 3 |
| Pin 33 | DB4 — Parallel data output bit 4 |
| Pin 34 | DB5 — Parallel data output bit 5 |
| Pin 35 | DB6 — Parallel data output bit 6 |
| Pin 36 | DB7 — Parallel data output bit 7 |
| Pin 37 | DB8 — Parallel data output bit 8 |
| Pin 38 | DB9 — Parallel data output bit 9 |
| Pin 39 | DB10 — Parallel data output bit 10 |
| Pin 40 | DB11 — Parallel data output bit 11 |
| Pin 41 | DB12 — Parallel data output bit 12 |
| Pin 42 | DB13 — Parallel data output bit 13 (MSB) |
| Pin 43 | DVDD — Digital supply (+5 V) |
| Pin 44 | DGND — Digital ground |
Typical Applications
AD7865BSZ-2 is suitable for 7 applications: Three-Phase Motor Control Feedback, Power Quality & Power Metering Analyzers, Multi-Axis Industrial Servo Feedback, Industrial Data-Acquisition (±10 V Inputs), AC Line Voltage & Current Monitoring, Vibration & Acoustic Instrumentation, Uninterruptible Power Supply (UPS) / Inverter Monitoring.
Three-Phase Motor Control Feedback
The AD7865BSZ-2's four simultaneously-sampling 14-bit SAR channels and ±10 V bipolar input range make it ideal for digitizing three-phase motor currents and DC-bus voltage in vector-control (FOC) loops. Each conversion takes 2.4 µs per channel, supporting inverter switching frequencies to 50 kHz with bandwidth to spare, and the on-chip 2.5 V reference eliminates a precision external reference. Placed between the current-sensor/HALL outputs and the DSP/MCU ADC interface, it preserves inter-channel phase via four track/hold amplifiers - a critical advantage over multiplexed ADCs that would introduce sampling skew and corrupt the FOC transform. Trade-off documented for size: a smaller LQFP-packaged replacement (e.g. AD7606 family on the XAIPART Site MPN list) would shrink the PCB but requires PCB rework.
Recommended
Power Quality & Power Metering Analyzers
The AD7865BSZ-2 simultaneously digitizes up to four high-voltage inputs - line voltages V1/V2/V3 and neutral current, or L1/L2/L3 voltages with residual current - at 350 kSPS per channel with ±10 V bipolar input range suitable for shunt-derived current signals. Four track-and-hold amplifiers preserve inter-channel phase to within sub-microsecond tolerance, enabling accurate harmonic analysis up to the 50th/60th harmonic of 50/60 Hz mains. As a 14-bit ADC with 80 dB SNR, it provides adequate dynamic range for revenue-grade and sub-revenue metering. Placed on the meter main board between the voltage-divider/shunt and the metering MCU, it pairs well with the PIC32MZ1024EFM144 MCU family on the XAIPART list. Trade-off documented for resolution: 16-bit ADCs improve harmonic precision but cost more.
Recommended
Multi-Axis Industrial Servo Feedback
The AD7865BSZ-2's four simultaneous 350 kSPS SAR channels are well-suited to multi-axis servo systems that digitize position-loop feedback from four axes concurrently. Each channel's 0.35 µs acquisition time and ±10 V bipolar range accommodate resolver-derived analog signals or direct encoder-interface analog signals without external signal conditioning. The integrated 2.5 V reference and parallel interface minimize external component count on the servo board. Placed adjacent to the axis-feedback op-amps on the servo controller PCB, it reduces BOM relative to four single-channel ADCs. Trade-off documented for latency: 2.4 µs per channel meets typical 8 kHz current-loop rates but adds quantization delay to higher-bandwidth force loops.
Recommended
Industrial Data-Acquisition (±10 V Inputs)
The AD7865BSZ-2's ±10 V bipolar input range lets it accept standard industrial analog inputs (±10 V or 4-57 mA with external resistor) directly. Fourteen channels convert loads independently at 350 kSPS each, and a 14-bit resolution provides 1.22 mV LSB on the ±10 V range - adequate for most process-control transducer signals. Placed on a DAQ board between sensor-conditioning op-amps and the host MCU, it provides a single-IC four-channel front end. Trade-off documented for noise: a 16-bit ADC provides 4x the resolution but at higher cost; the 14-bit AD7865BSZ-2 suits general-purpose industrial DAQ where 14-bit precision is sufficient.
Recommended
AC Line Voltage & Current Monitoring
The AD7865BSZ-2's four simultaneous sampling channels and ±10 V bipolar input range support parallel digitization of L1/L2/L3 phase voltages and the neutral current - the canonical 4-channel AC monitoring configuration. The 350 kSPS per-channel rate oversamples the 50/60 Hz mains waveform by ~5000x, capturing harmonics well beyond the 50th harmonic for power-quality analysis. Placed between the voltage-divider/CT conditioning network and the monitoring MCU/FPGA, it provides a compact simultaneous-sampling front end. Trade-off documented for accuracy: the on-chip 2.5 V reference drifts ±50 ppm/°C; for revenue-grade meters an external ADR45xx reference is preferred.
Recommended
Vibration & Acoustic Instrumentation
The AD7865BSZ-2's 350 kSPS per channel and 14-bit resolution suit vibration analyzers digitizing up to four accelerometers simultaneously. Each channel's 80 dB SNR at 50 kHz input supports FFT analysis of vibration signatures, and the simultaneous-sampling architecture eliminates the time skew that would otherwise appear as phase noise in cross-channel analysis. Placed between the IEPE/charge amplifiers and the DSP, it provides a compact four-channel acquisition front end. Trade-off documented for dynamic range: vibration analysis on heavy machinery benefits from 16-bit ADC resolution (e.g. AD7606 family on the XAIPART Site MPN list) to capture bearing-fault spectral signatures.
Recommended
Uninterruptible Power Supply (UPS) / Inverter Monitoring
The AD7865BSZ-2's four simultaneous 350 kSPS SAR channels and ±10 V bipolar input range support UPS and inverter systems digitizing input-AC voltage, output-AC voltage, DC-bus voltage, and load current concurrently. The simultaneous sampling preserves phase across the four signals - critical for the closed-loop control algorithms in inverter feedback. Placed on the UPS control board between the sensing resistors/HALL-effect transducers and the digital controller, it provides a single-chip four-channel monitoring IC. Trade-off documented for noise immunity: the parallel interface emits switching transients; careful PCB layout with local decoupling is required to maintain SNR.
Recommended
Recommended Products Summary
Engineering reference data for AD7865BSZ-2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7865BSZ-1 | AD7865BSZ-3 | AD7865BSZ-1REEL | AD7865BS-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 | 4 simultaneous-sampling | 4 simultaneous-sampling | 4 simultaneous-sampling | 4 simultaneous-sampling | 4 simultaneous-sampling |
| Sampling Rate | 350 kSPS per channel | 350 kSPS per channel | 350 kSPS per channel | 350 kSPS per channel | 350 kSPS per channel |
| Input Range | Bipolar ±5 V / ±10 V (HW/SW) | Bipolar ±5 V / 0-5 V | Bipolar ±10 V / 0-10 V | Bipolar ±5 V / 0-5 V | Bipolar ±5 V / 0-5 V |
| Supply Voltage | +5 V single supply | +5 V single supply | +5 V single supply | +5 V single supply | +5 V single supply |
| Internal Reference | 2.5 V on-chip | 2.5 V on-chip | 2.5 V on-chip | 2.5 V on-chip | 2.5 V on-chip |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
Key Differentiators
- Highest bipolar input range member of the AD7865 family (±10 V) (vs AD7865BSZ-1)
- Pin-to-pin identical to other AD7865 family members (44-MQFP) (vs AD7865BSZ-3)
- Integrated 2.5 V reference eliminates external precision reference (vs AD7865BS-1 (non-RoHS variant))
Design Notes
Place the 0.1 µF + 10 µF decoupling capacitor pair within 5 mm of each AVDD pin and within 10 mm of each DVDD pin. Use a star-ground topology that joins AGND, DGND, and the ground plane at the ADC ground pin. The four VIN inputs should be routed symmetrically with matched trace lengths to preserve inter-channel phase. Route DB0-DB13 parallel output traces as a tightly-coupled bus, away from noisy switching traces, and add 33 Ω series-termination resistors if the bus exceeds 50 mm.
Do not drive the VIN inputs beyond ±15 V (absolute maximum) - the on-chip protection clamps at this level but sustained overdrive can damage the part. The HW/SW RANGE pins must be left open or tied to AGND for the ±5 V range, and tied to AVDD for the ±10 V range; floating pins select undefined range. The 2.5 V internal reference must be buffered with a 10 µF X7R ceramic on the REF pin to meet SNR - omitting this cap reduces SNR by 3-5 dB.
For best SNR (80 dB at 50 kHz input), keep analog input traces short and surrounded by a ground-guard trace tied to AGND. The four VIN traces should be routed in parallel as a closely-coupled bundle to minimize inter-channel skew. Avoid running digital DB0-DB13 bus traces parallel to VIN traces; if they must cross, do so at 90 degrees. For the highest resolution, place a 2-pole RC anti-alias filter (1 kΩ + 470 pF, fc ~338 kHz) on each VIN input.
Estimated: At a continuous 350 kSPS conversion rate with +5 V supply and four channels active, the AD7865BSZ-2 typically dissipates ~150 mW. With the 44-MQFP package theta_JA of approximately 50 °C/W (per ADI 44-MQFP thermal data), this yields a junction-temperature rise of ~7.5 °C above ambient. In typical industrial environments (-40 °C to +85 °C ambient), the junction stays within rated limits; no external heatsink is required.
Compliance Information
RoHS and REACH status to be confirmed from Analog Devices product page or distributor material declaration; the 'Z' suffix in BSZ-2 generally denotes lead-free/RoHS-compliant, but official datasheet ordering-information table or distributor material declaration is authoritative.
