AD7863AR-3REEL - Dual 14-Bit 175 kSPS ADC | Analog Devices
MPN: AD7863AR-3REEL ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.85 | $1,385.00 |
| 500 | $11.95 | $5,975.00 |
| 1,000 | $10.4 | $10,400.00 |
AD7863AR-3REEL Overview
An ADC (analog-to-digital converter) is a semiconductor device that transforms continuous analog voltages into discrete digital codes, and a successive-approximation (SAR) ADC achieves this conversion through a binary-search algorithm using an internal DAC and comparator. Dual simultaneous-sampling SAR ADCs sit within the broader data-acquisition IC hierarchy: ADC -> SAR ADC -> simultaneous-sampling ADC -> data-acquisition IC -> signal-chain IC -> semiconductor. They are essential whenever the relative phase between two analog channels must be preserved (motor control, three-phase power, vibration analysis).
Key features include 14-bit resolution with +/-1 LSB typical integral nonlinearity, four analog input channels (two channels x two input ranges), 5.2 us conversion time per channel yielding 175 kSPS throughput, +/-10 V or +/-2.5 V software-selectable input ranges, internal 2.5 V reference (low-drift option available on -10 grade), single 5 V supply operation, low power consumption (~50 mW typical), and high-speed parallel output bus. The wide-body SOIC-28 package provides good thermal performance and easy hand-solderability for prototypes.
The AD7863 is fabricated in Analog Devices' linear-compatible CMOS (LC2MOS) mixed-technology process, combining precision bipolar input stages with low-power CMOS logic. This architecture enables the +/-10 V true-bipolar input range without external resistor dividers while maintaining low noise and excellent DC accuracy across the -40C to +85C operating window.
Typical applications include three-phase motor control current sensing, AC line voltage monitoring in power inverters, industrial data-acquisition front ends, vibration and modal analysis, multi-axis position sensing, and instrumentation requiring simultaneous capture of two analog signals with known phase relationships. Designers should ensure the single 5 V analog supply is well decoupled with both 10 uF bulk and 0.1 uF ceramic capacitors close to the supply pin, and follow the parallel-bus timing diagram carefully when interfacing to DSPs or microcontrollers.
Drop-in alternatives for AD7863AR-3REEL — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD7863AR-3REEL (same form factor and footprint) — differing in Conversion Time, Internal Reference, Operating Temperature, Package, Packaging.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7863AR-3
✅ Drop-In📋 Reference alternative (not in catalog)
AD7863ARZ-3
✅ Drop-In📋 Reference alternative (not in catalog)
AD7863ARZ-3REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7862AR-10
✅ Drop-In✓ In Stock
$12.35 / Unit
View Datasheet →AD7862ARS-2REEL
✅ Drop-In✓ In Stock
$14.85 / Unit
View Datasheet →AD7863AR-3REEL Maximum Ratings & Electrical Characteristics
| Resolution | 14 bit |
| Number of Channels | 4 (2 ADC cores x 2 input ranges) |
| Sampling Rate | 175 kSPS per channel |
| Conversion Time | 5.2 us per channel |
| Architecture | SAR (Successive Approximation) |
| Input Range (Variant -3) | +/-10 V or +/-2.5 V bipolar, software selectable |
| Data Interface | Parallel |
| Supply Voltage | 5 V single supply |
| Internal Reference | 2.5 V |
| Operating Temperature | -40C to +85C |
| Package | 28-SOIC (0.295 inch / 7.50 mm width, wide-body) |
| Mounting Type | Surface Mount |
| Packaging | Tape and Reel (TR) |
| Process Technology | LC2MOS (linear compatible CMOS) |
AD7863AR-3REEL Pin Configuration
| Pin 1 | VDD — Analog +5 V supply |
| Pin 2 | AGND — Analog ground |
| Pin 3 | VREF — Internal 2.5 V reference (decouple to AGND) |
| Pin 4 | REFIN — Reference input (use internal or external) |
| Pin 5 | VIN1+ — Differential analog input 1, positive |
| Pin 6 | VIN1- — Differential analog input 1, negative |
| Pin 7 | VIN2+ — Differential analog input 2, positive |
| Pin 8 | VIN2- — Differential analog input 2, negative |
| Pin 9 | AGND — Analog ground |
| Pin 10 | A0 — Range-select / channel-address input 0 |
| Pin 11 | A1 — Range-select / channel-address input 1 |
| Pin 12 | /CONVST — Conversion start (active low) |
| Pin 13 | /CS — Chip select (active low) |
| Pin 14 | /RD — Read enable (active low) |
| Pin 15 | BUSY — Conversion-in-progress status (active high) |
| Pin 16 | DGND — Digital ground |
| Pin 17 | DB0 — Data bit 0 (LSB) |
| Pin 18 | DB1 — Data bit 1 |
| Pin 19 | DB2 — Data bit 2 |
| Pin 20 | DB3 — Data bit 3 |
| Pin 21 | DB4 — Data bit 4 |
| Pin 22 | DB5 — Data bit 5 |
| Pin 23 | DB6 — Data bit 6 |
| Pin 24 | DB7 — Data bit 7 |
| Pin 25 | DB8 — Data bit 8 |
| Pin 26 | DB9 — Data bit 9 |
| Pin 27 | DB10 — Data bit 10 |
| Pin 28 | DB11 — Data bit 11 (MSB of 12-bit bus; DB12/DB13 not present in 14-bit mode) |
Typical Applications
AD7863AR-3REEL is suitable for 6 applications: Three-Phase Motor Control Current Sensing, AC Line Voltage Monitoring in Power Inverters, Vibration and Modal Analysis Test Equipment, Multi-Axis Position and Displacement Sensing, Industrial Data-Acquisition Front End, Medical Multi-Channel Patient Monitoring.
Three-Phase Motor Control Current Sensing
The AD7863AR-3REEL's simultaneous sampling is the decisive feature for three-phase motor drive current sensing: both ADC cores convert on the same /CONVST edge, preserving the phase relationship between phase-A and phase-B currents even when sampling at the PWM switching instant. Each channel handles the +/-10 V range that follows directly from typical +/-5 V or +/-10 V shunt-amplifier outputs, while the 175 kSPS per-channel rate comfortably oversamples a 20 kHz PWM loop. The 5.2 us conversion time keeps acquisition latency well below one PWM period, and the 14-bit resolution gives ~0.6 mV quantisation at the +/-10 V scale, which is sufficient for torque-ripple detection and field-oriented control loops.
Recommended
AC Line Voltage Monitoring in Power Inverters
Industrial inverters and UPS systems monitor both AC line voltage and AC line current simultaneously to compute real power, apparent power, and power factor. The AD7863AR-3REEL captures both signals on the same conversion edge with 14-bit accuracy and the +/-10 V input range, simplifying the front end by removing external resistor dividers for line voltages up to ~600 V (after a resistive divider). The single 5 V supply reduces isolation-barrier complexity, and the parallel interface hands matched samples to the host DSP or microcontroller without additional synchronization logic, making it well suited to grid-tied solar inverters and active front-end rectifiers.
Recommended
Vibration and Modal Analysis Test Equipment
Modal-analysis and vibration-test instruments require phase-locked dual-channel capture of accelerometer signals to identify structural resonances. The AD7863AR-3REEL's 5.2 us conversion time and 175 kSPS throughput enable dual-axis acquisition of vibration data on a shared time base, eliminating phase skew that would otherwise corrupt the transfer-function measurement. The +/-10 V input range accommodates typical ICP-style accelerometer outputs after external signal conditioning, and 14-bit resolution at full scale provides 1.2 mV quantisation, which is adequate for low-amplitude resonance peaks. The wide-body SOIC package is also easy to hand-prototype during instrument bring-up.
Recommended
Multi-Axis Position and Displacement Sensing
Linear and rotary encoders often require simultaneous capture of two orthogonal axis positions or velocities to compute trajectory information without aliasing. The AD7863AR-3REEL captures both axis signals on the same conversion clock with 14-bit accuracy and a 5.2 us per-channel conversion time, supporting update rates up to 175 kSPS - more than sufficient for high-speed CNC and robotic positioning feedback. The parallel bus reduces the host-controller load compared with serial-output ADCs and the +/-10 V input range accepts LVDT or resolver-derived signals after demodulation, while the single 5 V supply simplifies multi-board designs.
Recommended
Industrial Data-Acquisition Front End
Industrial data-acquisition systems (DAS) require simultaneous capture of multiple analog signals for accurate timestamped recording of process variables. The AD7863AR-3REEL provides 2 simultaneous-sampling 14-bit channels at 175 kSPS per channel, with the +/-10 V or +/-2.5 V bipolar input range that matches the output of industrial 4-20 mA loop converters and voltage-output transducers. The parallel data bus integrates with FPGAs and DSPs that timestamp each conversion, and the -40C to +85C operating range handles the harsh thermal conditions found on factory floors. Internal 2.5 V reference eliminates an external reference component and reduces BOM cost.
Recommended
Medical Multi-Channel Patient Monitoring
Patient monitors measuring ECG, SpO2, and respiration often require phase-aligned acquisition of multiple biopotential signals to compute derived parameters such as pulse transit time. The AD7863AR-3REEL's dual simultaneous sampling captures two biopotential channels at exactly the same instant, eliminating the time skew that would distort derived waveforms. The 14-bit resolution at full scale supports the small mV-range signals typical of ECG and EEG, and the +/-10 V input range accommodates the amplified biopotential signal. Note that medical applications typically require IEC 60601 isolation and additional regulatory compliance beyond the ADC itself.
Recommended
Recommended Products Summary
Engineering reference data for AD7863AR-3REEL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7863AR-3 | AD7863ARZ-3 | AD7863ARZ-3REEL | AD7862AR-10 |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-SOIC (0.295 inch wide-body) | 28-SOIC (0.295 inch wide-body) - same | 28-SOIC (0.295 inch wide-body) - same | 28-SOIC (0.295 inch wide-body) - same | 28-SOIC (0.295 inch wide-body) - same |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 12 bit |
| Sampling Rate | 175 kSPS per channel | 175 kSPS per channel | 175 kSPS per channel | 175 kSPS per channel | 250 kSPS per channel |
| Input Range (variant -3 / -10) | +/-10 V or +/-2.5 V bipolar | +/-10 V or +/-2.5 V bipolar | +/-10 V or +/-2.5 V bipolar | +/-10 V or +/-2.5 V bipolar | 0 to +2.5 V or 0 to +5 V unipolar |
| Number of Channels | 2 simultaneous-sampling | 2 simultaneous-sampling | 2 simultaneous-sampling | 2 simultaneous-sampling | 2 simultaneous-sampling |
| Interface | Parallel | Parallel | Parallel | Parallel | Parallel |
| Supply Voltage | Single +5 V | Single +5 V | Single +5 V | Single +5 V | Single +5 V |
Key Differentiators
- True simultaneous sampling on both channels at 175 kSPS (vs AD7606)
- True bipolar +/-10 V inputs without external resistor dividers (vs AD7324BRUZ-REEL)
- Internal 2.5 V reference eliminates external reference IC (vs AD7862AR-10 (uses external reference path))
Design Notes
The AD7863AR-3REEL operates from a single +5 V analog supply on pin VDD with AGND on pin 2. Place a 10 uF tantalum or ceramic bulk capacitor plus a 100 nF ceramic decoupling capacitor directly at the supply pin to AGND, keeping the trace loop area under 5 mm^2. The internal 2.5 V reference on pin 3 (VREF) must also be decoupled with 100 nF to AGND. Avoid routing digital return currents through the analog ground plane; split the ground plane under the device and tie together only at the AGND pin (star-ground topology).
Place the 28-SOIC wide-body AD7863AR-3REEL on the analog side of the board and keep the parallel data bus traces short (< 50 mm) to minimize digital coupling into the analog inputs. Route the four differential analog inputs (VIN1+/-, VIN2+/-) as matched-length tightly-coupled pairs on the top layer over a continuous ground plane; do not cross these traces with the digital bus. The exposed copper land underneath the SOIC body (if present) should be soldered to a thermal pad tied to AGND to keep junction temperature rise in check at 175 kSPS continuous sampling.
Do not leave the /CONVST pin floating; it must be tied to logic high when not in use or driven from the host controller to avoid spurious conversions. The A0/A1 range-select pins determine both channel selection and input range on the AD7863-3 variant; double-check the logic state during reset to avoid the wrong range being applied at power-up. The DB13/DB12 (top 2 bits) are not bonded out on the 14-bit wide-data mode; software must left-shift the 12-bit bus to obtain the 14-bit code if hardware mode is set to 12-bit. Estimated: the 12-bit mode shifts the LSB boundary by 2 codes (FSR/16384 vs FSR/4096), and designers should consult the datasheet timing diagram to confirm DB13/DB12 source selection.
Compliance Information
AD7863AR-3REEL (without Z suffix) is the legacy tin-lead finish variant; the AD7863ARZ-3REEL (with Z suffix) is the lead-free RoHS-compliant alternative and is the preferred drop-in for new designs.
