AD7862ARS-3REEL - Dual 12-Bit 250kSPS ADC, ±2.5V | Analog Devices
MPN: AD7862ARS-3REEL ✓ فعالAD7862ARS-3REEL جائزہ
A successive-approximation ADC (SAR ADC) is a type of data converter that performs a binary search across an internal DAC to resolve an input voltage to N bits within a fixed number of conversion cycles. Dual-SAR ADCs place two complete SAR cores on one die, enabling truly simultaneous sampling of two signals - critical for power-converter control, motor drives, and multi-phase measurement where phase skew between channels would corrupt the result.
Key features of the AD7862ARS-3REEL include 250 kSPS per-channel throughput, simultaneous sampling across two channels (four inputs total), ±2.5 V bipolar input range (variant -3), 4 µs conversion time per channel, on-chip 2.5 V reference, overvoltage protection on analog inputs, low 60 mW typical power dissipation, and a 50 µW power-saving mode. The high-speed parallel interface simplifies connection to microcontrollers, DSPs, and FPGAs without external glue logic.
Typical applications include motor-control current sensing, three-phase power-line monitoring, multi-axis inertial measurement, data-acquisition front ends, and instrumentation. The simultaneous-sampling dual-core topology removes inter-channel skew, while the ±2.5 V range handles industrial signal levels without external attenuators.
When designing with this part, place 0.1 µF decoupling capacitors close to each supply pin and keep analog/digital grounds separated until they join at the ADC GND pin. The internal 2.5 V reference can be bypassed with a 10 µF tantalum capacitor for low-noise operation; an external reference may be used for higher accuracy.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not typically aggregated on the Analog Devices product page.
کے لیے ڈراپ اِن متبادل AD7862ARS-3REEL — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں AD7862ARS-3REEL (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Architecture, Number of Inputs, Package / Case, Packaging, Power Dissipation (typical).
AD7862ARSZ-3REEL
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
AD7862ARS-3
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
AD7862ARSZ-3
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
AD7862AR-3REEL
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
AD7862ARS-2REEL
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →AD7862ARS-3REEL زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Manufacturer | Analog Devices |
| Part Number | AD7862ARS-3REEL |
| Number of Bits | 12 |
| Number of Inputs | 4 (2 channels, simultaneous sampling) |
| Sampling Rate (Per Second) | 250 kSPS per channel |
| Conversion Time | 4 µs |
| Data Interface | Parallel |
| Input Range (variant -3) | ±2.5 V |
| سپلائی وولٹیج | +5 V single supply |
| Power Dissipation (typical) | 60 mW |
| Power-Saving Mode | 50 µW typical |
| Internal Reference | +2.5 V |
| Track-and-Hold Amplifiers | 2 (one per channel) |
| Architecture | Dual SAR |
| Analog Input Protection | Overvoltage protected |
| پیکیج / کیس | 28-SSOP (0.209", 5.30 mm width) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| Packaging | Tape & Reel (TR) |
AD7862ARS-3REEL پن کنفیگریشن
| پن 1 | VA1+ — Analog input channel A1 positive (variant -3: ±2.5 V range) |
| پن 2 | VA1- — Analog input channel A1 negative |
| پن 3 | VA2+ — Analog input channel A2 positive |
| پن 4 | VA2- — Analog input channel A2 negative |
| پن 5 | AGND — Analog ground |
| پن 6 | VREF — Reference voltage output / input (2.5 V nominal) |
| پن 7 | VDD — +5 V analog supply |
| پن 8 | REFSENSE — Reference sense input |
| پن 9 | DGND — Digital ground |
| پن 10 | CONVST — Conversion start input |
| پن 11 | BUSY — Busy output (active during conversion) |
| پن 12 | RD — Read input (active low) |
| پن 13 | CS — Chip select (active low) |
| پن 14 | A0 — Channel select input (0 = channel A, 1 = channel B) |
| پن 15 | HBEN — High byte enable (DB8-DB11 vs DB0-DB11) |
| پن 16 | DB11/MSB — Data bit 11 (MSB) / parallel output |
| پن 17 | DB10 — Data bit 10 |
| پن 18 | DB9 — Data bit 9 |
| پن 19 | DB8 — Data bit 8 |
| پن 20 | DB7 — Data bit 7 |
| پن 21 | DB6 — Data bit 6 |
| پن 22 | DB5 — Data bit 5 |
| پن 23 | DB4 — Data bit 4 |
| پن 24 | DB3 — Data bit 3 |
| پن 25 | DB2 — Data bit 2 |
| پن 26 | DB1 — Data bit 1 |
| پن 27 | DB0/LSB — Data bit 0 (LSB) |
| پن 28 | NC — Not connected (per datasheet) |
عام استعمالات
AD7862ARS-3REEL کے لیے موزوں ہے 7 ایپلیکیشنs: Motor Control Current Sensing, Three-Phase Power-Line Monitoring, Multi-Axis Inertial Measurement, Industrial Data Acquisition Front Ends, Servo-Drive Position Feedback, Audio Spectrum Analyzer Front End, Medical Patient Monitoring Equipment.
Motor Control Current Sensing
The AD7862ARS-3REEL's dual simultaneous-sampling SAR architecture fits three-phase motor-control current sensing where phase-to-phase skew corrupts field-oriented control (FOC) loops. With ±2.5 V input range and 250 kSPS per channel, two current transformers or shunt-amplifier outputs can be digitized at full rate through one IC, removing the need for two synchronized ADCs. The 4 µs conversion time keeps control-loop latency under 1 PWM cycle at typical 20 kHz switching frequencies. Compared to a multiplexer + single-ADC architecture, simultaneous sampling removes inter-channel sample-skew errors that manifest as torque ripple in FOC drives. Recommend pairing with ADuM3151 isolators and AMC1301 reinforced-isolated shunt amplifiers for high-voltage IGBT/SiC inverter platforms.
تجویز کردہ
Three-Phase Power-Line Monitoring
The AD7862ARS-3REEL suits three-phase power-quality and revenue-metering front ends where four channels need simultaneous sampling at modest rates. The ±2.5 V range matches CT/PT-derived signals after scaling resistors; the 250 kSPS per-channel rate captures up to the 50th harmonic on 50/60 Hz mains. Two ADC cores mean phases A and B (and optionally C) can be captured on one device, reducing board area and BOM cost versus two cascaded converter stages. The parallel interface streams 12-bit samples directly into an FPGA or DSP for FFT-based harmonic analysis. The 60 mW typical dissipation and 50 µW power-down mode help meet IEC 62053-22 idle-power budgets.
تجویز کردہ
Multi-Axis Inertial Measurement
The AD7862ARS-3REEL is used in inertial measurement units (IMUs) where 3-axis gyroscope and accelerometer outputs must be sampled simultaneously. Simultaneous acquisition removes the 1 µs+ skew that single-ADC + mux designs introduce at 250 kSPS, which corrupts attitude estimates during high angular-rate maneuvers. The four input channels support XYZ gyro plus one spare reference channel. The internal 2.5 V reference simplifies the analog supply chain, and the small 28-SSOP footprint fits space-constrained flight-controller PCBs. For higher-precision IMU designs, the AD7693 16-bit pin-compatible upgrade offers 4× resolution at lower speed; for higher shock survivability, pair the analog front end with ADXRS645 gyros.
تجویز کردہ
Industrial Data Acquisition Front Ends
General-purpose industrial DAQ systems use the AD7862ARS-3REEL to digitize up to four ±2.5 V signals per device with simultaneous sampling. The 250 kSPS rate supports vibration, strain-gauge bridge, and process-control transducer inputs. The 28-SSOP package supports hand-prototyping on through-hole-to-SSOP adapter boards as well as high-density SMT assembly. The parallel interface glues directly to 8/16-bit microcontrollers and 32-bit FPGAs without glue logic. Engineers typically pair this part with the AD8221 instrumentation amplifier for low-level sensor signals and the AD780 precision reference for enhanced accuracy when the internal 2.5 V reference is bypassed.
تجویز کردہ
Servo-Drive Position Feedback
The AD7862ARS-3REEL is well-suited to digitizing resolver/encoder-derived analog position signals in high-bandwidth servo drives. The dual simultaneous-sampling inputs can capture sine and cosine windings of a resolver synchronously, after r/d conversion. The 12-bit resolution gives 0.088° position resolution - sufficient for mid-range servo loops; the ±2.5 V input range matches resolver excitation-derived signals. The 250 kSPS per-channel rate easily handles 20 kHz current-loop update rates with margin. For 16-bit precision servo designs, the AD7690 pin-compatible upgrade is available.
تجویز کردہ
Audio Spectrum Analyzer Front End
The AD7862ARS-3REEL can serve as the front-end ADC of an audio spectrum analyzer operating from a few hundred Hz to ~100 kHz. The 250 kSPS per-channel rate and 12-bit resolution capture the audio band without aliasing, while dual-channel sampling supports stereo input or single-ended/differential comparison. The ±2.5 V input range is ideal for line-level audio after DC blocking. The parallel interface pushes samples directly into an FPGA for FFT processing. For higher-fidelity 24-bit designs, the AD7768 series is the natural upgrade path; for portable audio analyzers, the AD1974 4-channel ADC provides higher channel density.
تجویز کردہ
Medical Patient Monitoring Equipment
The AD7862ARS-3REEL fits medical patient-monitoring equipment such as multi-channel ECG, EEG, or pulse-oximetry front ends where two simultaneous waveforms need synchronous acquisition. The 250 kSPS per-channel rate handles high-resolution ECG (typically 1-10 kHz sample rate), and the internal 2.5 V reference simplifies design for IEC 60601-1 isolated patient circuits. The 12-bit resolution is adequate for mid-tier monitoring; defibrillator-proof designs may use the ADAS1000 family which integrates respiration, impedance, and pace-detection. Always add appropriate isolation amplifiers (ADuM3151) and IEC 60601-1 compliant power for patient-contact designs.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا AD7862ARS-3REEL — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
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متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | AD7862ARSZ-3REEL | AD7862ARS-3 | AD7862ARSZ-3 | AD7862AR-3REEL | AD7862ARS-2REEL |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit |
| Input Range | ±2.5 V | ±2.5 V | ±2.5 V | ±2.5 V | ±2.5 V | 0 V to 2.5 V (unipolar) |
| Sampling Rate | 250 kSPS/channel | 250 kSPS/channel | 250 kSPS/channel | 250 kSPS/channel | 250 kSPS/channel | 250 kSPS/channel |
| Architecture | Dual simultaneous SAR | Dual simultaneous SAR | Dual simultaneous SAR | Dual simultaneous SAR | Dual simultaneous SAR | Dual simultaneous SAR |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Packaging | Tape & Reel | Tape & Reel | Tube | Tube | Tape & Reel | Tape & Reel |
| RoHS Compliant | Unknown (no Z suffix) | Yes (Z suffix = Pb-free) | Unknown | Yes (Z suffix = Pb-free) | Unknown | Unknown |
اہم امتیازی خصوصیات
- Dual simultaneous-sampling SAR architecture on a single 28-SSOP die (بمقابلہAD7862ARS-2REEL)
- RoHS variant available as drop-in replacement (بمقابلہAD7862ARSZ-3REEL)
- Pin-compatible 14-bit upgrade path (بمقابلہAD7863 family)
ڈیزائن نوٹس
Decouple VDD with a 10 µF tantalum in parallel with a 0.1 µF ceramic placed as close as possible to the VDD pin; the AD7862 draws up to 12 mA from a +5 V supply. Add a separate digital supply pin decoupling (0.1 µF) if your layout exposes a distinct digital VDD node. Estimated: 60 mW typical dissipation implies ~12 mA average supply current at +5 V.
Use a star-ground topology with the AD7862 GND pin as the single point where AGND and DGND meet. Route analog input traces (VA1+, VA1-, VA2+, VA2-) symmetrically and keep them short; the ±2.5 V input range is moderately sensitive to ground-bounce-induced common-mode errors. Place the internal 2.5 V reference bypass capacitor (10 µF recommended by Analog Devices) adjacent to VREF with a minimal loop area to preserve noise performance.
Ensure the BUSY signal is correctly monitored - data is valid only after BUSY returns high. For simultaneous acquisition, drive CONVST once and read both channels after a single BUSY cycle. Do not exceed ±2.5 V on analog inputs; the on-chip overvoltage protection clamps at higher voltages but continuous overdrive degrades input-impedance matching. When migrating from the -3 (±2.5 V) to the -2 (0 V to 2.5 V) variant, recalibrate any bipolar-system scaling resistors as the input range changes substantially.
The parallel data bus (DB0-DB11) transitions on every conversion at 250 kSPS - route these traces over a continuous ground plane and add 33 Ω series termination if the bus length exceeds ~50 mm to dampen reflections. The BUSY and CONVST signals are timing-critical; keep them short and away from noisy digital lines. For EMC-sensitive designs, place a ferrite bead on the digital supply rail feeding the AD7862.
تعمیل کی معلومات
RoHS status not stated in verified web data; the Z-suffix variant (AD7862ARSZ-3REEL) is Pb-free per Analog Devices part-numbering convention. AEC-Q100 not applicable as this part is intended for industrial/test/measurement applications, not automotive qualified.
