AD7862ARS-2REEL - Dual 250kSPS 12-Bit Simultaneous Sampling ADC | Analog Devices
N.º da peça: AD7862ARS-2REEL ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $23.5 | $23,50 |
| 10 | $21.2 | $212,00 |
| 100 | $18.75 | $1.875,00 |
| 500 | $16.4 | $8.200,00 |
| 1.000 | $14.85 | $14.850,00 |
AD7862ARS-2REEL Visão geral
A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a sampling data converter that uses a binary-search algorithm and an internal DAC to resolve an analog input to N bits in N clock cycles. SAR ADCs are valued for deterministic latency, excellent DC accuracy, and zero-latency single-shot conversion, which makes them the dominant architecture for multiplexed or simultaneously-sampled multi-channel industrial measurement, motor control, and instrumentation systems where each channel must be captured at a precise instant.
Key features of the AD7862 include 250 kSPS per-channel throughput, simultaneous sampling across two ADC cores sharing one reference, single +5 V supply operation, a choice of input ranges (0 V to +2.5 V for the -2 input range variant, or ±10 V / 0 V to +5 V on -1 / -3 variants), and a high-speed parallel interface for direct connection to microprocessors, DSPs, or FPGAs. The -2 input-range selection is the bipolar ±10 V part with hardware input-range protection on the analog pins.
The architecture uses two independent SAR cores clocked in parallel from a common conversion start signal, guaranteeing that VA1 and VA2 (or VB1 and VB2) are sampled on the same clock edge. An internal 2.5 V reference with low temperature drift supplies both ADCs, eliminating the need for an external reference and the associated noise and cost. Power dissipation is typically 60 mW at full throughput and drops to 5 µW in standby mode, enabling portable and battery-backed designs.
Typical applications include multi-axis motor control (simultaneous current sensing on multiple phases), three-phase power-line monitoring, instrumentation and process control front ends, multi-channel data-acquisition cards, vibration and acoustic analysis front ends, and industrial control loops where channel-to-channel skew must be eliminated.
When designing with this part, always place 100 nF decoupling capacitors as close as possible to the AVCC and DVCC pins and keep the analog ground plane separate from the digital ground plane, joined only at the AGND/DGND pins of the IC. Use a single 5 V supply that is well-regulated; ripple on AVCC directly appears as conversion noise. Because the device uses simultaneous sampling, ensure your DSP or FPGA reads both data words within the same control cycle to preserve the phase relationship.
This page synthesizes Analog Devices datasheet specifications, distributor pricing, drop-in alternatives, and design notes that are not consolidated on the manufacturer datasheet alone - giving engineers a single point of reference for selecting and qualifying the AD7862ARS-2REEL in new designs and legacy replacements.
Alternativas drop-in para AD7862ARS-2REEL — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com AD7862ARS-2REEL (mesmo formato e footprint) — diferindo em Packaging, Conversion Time, Internal Reference, Data Interface, Supply Voltage.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
AD7862ARS-2REEL7
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD7862ARSZ-2REEL
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD7862ARS-2
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD7862ARS-1REEL
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD7862ARS-3REEL
✅ Drop-In✓ Em estoque
$14.2 / unidade
Ver ficha técnica →AD7862ARS-10REEL
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD7862ARS-2REEL Classificações máximas e características elétricas
| Number of Bits | 12 |
| Sampling Rate (Per Second) | 250 kSPS |
| Number of Inputs | 4 (2 channels x 2 inputs, simultaneous sampling) |
| Input Type | Single-Ended, pseudo-differential (channel A/B) |
| Data Interface | Parallel |
| Architecture | SAR (Successive Approximation) |
| Input Range (variant -2) | 0 V to +2.5 V (or ±10 V on -1 / -3 variants) |
| Number of ADCs | 2 |
| Throughput Time | 4 µs (per conversion) |
| Reference Type | Internal +2.5 V |
| Supply Voltage (Analog/Digital) | +5 V single supply |
| Power Dissipation (typical) | 60 mW at full throughput |
| Standby Power | 5 µW (typical) |
| Temperatura de operação | -40 °C to +85 °C |
| Encapsulamento / Caixa | 28-SSOP (5.30 mm body width) |
| Tipo de montagem | Surface Mount |
| Packaging | Tape & Reel (REEL) |
| Standard Reel Quantity | 2500 |
Configuração de pinos do AD7862ARS-2REEL
| Pino 1 | VA1 — Channel A analog input 1 |
| Pino 2 | VA2 — Channel A analog input 2 |
| Pino 3 | VB1 — Channel B analog input 1 |
| Pino 4 | VB2 — Channel B analog input 2 |
| Pino 5 | AGND — Analog ground |
| Pino 6 | REF — Reference input/output |
| Pino 7 | REFOUT — Internal +2.5 V reference output |
| Pino 8 | A0 — Channel select (A or B) |
| Pino 9 | DB0 — Parallel data bit 0 (LSB) |
| Pino 10 | DB1 — Parallel data bit 1 |
| Pino 11 | DB2 — Parallel data bit 2 |
| Pino 12 | DB3 — Parallel data bit 3 |
| Pino 13 | DB4 — Parallel data bit 4 |
| Pino 14 | DB5 — Parallel data bit 5 |
| Pino 15 | DB6 — Parallel data bit 6 |
| Pino 16 | DB7 — Parallel data bit 7 |
| Pino 17 | DB8 — Parallel data bit 8 |
| Pino 18 | DB9 — Parallel data bit 9 |
| Pino 19 | DB10 — Parallel data bit 10 |
| Pino 20 | DB11 — Parallel data bit 11 (MSB) |
| Pino 21 | DGND — Digital ground |
| Pino 22 | DVCC — Digital +5 V supply |
| Pino 23 | AVCC — Analog +5 V supply |
| Pino 24 | CONVST — Conversion start input (active low) |
| Pino 25 | CS — Chip select (active low) |
| Pino 26 | RD — Read input (active low) |
| Pino 27 | BUSY — Conversion busy output (active low) |
| Pino 28 | CLK — External clock input |
Aplicações típicas
AD7862ARS-2REEL é adequado para 6 aplicaçãos: Multi-Phase Motor Control (FOC), Three-Phase Power Line Monitoring, Multi-Channel Data Acquisition Cards, Industrial Process Control Instrumentation, Vibration and Acoustic Analysis Front Ends, Touchscreen and Digitizer Digitizing Front End.
Multi-Phase Motor Control (FOC)
The AD7862ARS-2REEL's simultaneous dual-channel sampling makes it ideal for field-oriented control of three-phase motor drives. Its two ADC cores capture phase A and phase B currents on the same CONVST edge with 250 kSPS per channel and 12-bit resolution - sufficient bandwidth and accuracy for current-loop control in industrial servo drives. The internal +2.5 V reference eliminates external reference drift concerns, and the parallel interface simplifies connection to FPGAs or motor-control DSPs. Designers typically place current-sense op-amps upstream, then route the differential outputs directly into the VA1/VB1 inputs.
Recomendado
Three-Phase Power Line Monitoring
Smart-grid energy meters and power-quality analyzers benefit from the AD7862ARS-2REEL's ability to sample two channels simultaneously at 250 kSPS. By capturing voltage and current waveforms on the same clock edge, the device enables accurate real-power, reactive-power, and harmonic-distortion calculations. The 12-bit resolution is adequate for Class 0.5 energy metering, and the single +5 V supply simplifies the isolated power tree. The SSOP-28 footprint is small enough to fit alongside isolation barriers in compact meter designs.
Recomendado
Multi-Channel Data Acquisition Cards
PCI/PCIe and USB-based DAQ cards use the AD7862ARS-2REEL as a simultaneous-sampling front end. Its 250 kSPS per channel and parallel interface allow direct bus attachment to FPGAs that handle DMA transfer. The simultaneous-sampling architecture eliminates channel-to-channel skew, which is essential for vibration analysis and acoustic beam-forming. The internal reference saves PCB area, and the SSOP-28 footprint is compatible with high-density mixed-signal layouts.
Recomendado
Industrial Process Control Instrumentation
Process-control transmitters and PLC analog input modules benefit from the AD7862ARS-2REEL's industrial -40 °C to +85 °C operating range and simultaneous-sampling capability. The dual 12-bit ADCs allow redundant or ratiometric measurement (e.g., strain-gauge bridge plus reference) on a single IC, reducing component count. The +5 V single-supply operation simplifies the loop-powered design, and the low 5 µW standby power supports sleep modes in battery-backed 4-20 mA transmitters.
Recomendado
Vibration and Acoustic Analysis Front Ends
Condition-monitoring systems for predictive maintenance rely on simultaneous multi-axis vibration sampling. The AD7862ARS-2REEL's two simultaneous 250 kSPS ADC channels capture matched snapshots of accelerometer outputs from two perpendicular axes, eliminating phase skew that would otherwise corrupt modal analysis. The 12-bit resolution captures the dynamic range of piezoelectric accelerometers, and the parallel interface feeds DSP/FPGA FFT engines without buffering latency. Compact SSOP-28 packaging suits miniaturized sensor nodes.
Recomendado
Touchscreen and Digitizer Digitizing Front End
Touchscreen controllers and pen-digitizer systems use the AD7862ARS-2REEL's simultaneous-sampling capability to capture X and Y position voltages at the same instant. This eliminates position-accuracy errors caused by time skew between X and Y samples, improving touch accuracy. The 250 kSPS rate supports high report-rate digitizer designs, and the parallel interface can be directly connected to touchscreen controllers. The internal reference simplifies the bill of materials for consumer-grade products.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para AD7862ARS-2REEL — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | AD7862ARS-2REEL7 | AD7862ARSZ-2REEL | AD7862ARS-2 | AD7862ARS-1REEL | AD7862ARS-3REEL | AD7862ARS-10REEL |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | 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 | 28-SSOP - same |
| Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit |
| Sampling Rate | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS |
| Number of Channels (Simultaneous) | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Input Range (variant) | 0 to +2.5 V (-2) | 0 to +2.5 V (-2) | 0 to +2.5 V (-2) | 0 to +2.5 V (-2) | ±10 V (-1) | 0 to +5 V (-3) | ±10 V (-10) |
| Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel |
| Reference | Internal +2.5 V | Internal +2.5 V | Internal +2.5 V | Internal +2.5 V | Internal +2.5 V | Internal +2.5 V | Internal +2.5 V |
| Packaging Format | 13-inch reel, 2500 pcs | 7-inch reel, 750 pcs | 13-inch reel, 2500 pcs (RoHS) | Tube (no reel) | 13-inch reel, 2500 pcs | 13-inch reel, 2500 pcs | 13-inch reel, 2500 pcs |
Principais diferenciais
- True simultaneous sampling on two 12-bit ADC cores (vs Multiplexed single-ADC architectures (e.g., AD7476BRTZ-REEL family))
- Internal +2.5 V reference eliminates external component cost (vs External-reference ADCs in same speed class)
- Four 28-SSOP footprint variants for full design flexibility (vs AD7862AR-2REEL (28-SOIC) wider package)
Notas de projeto
Place 100 nF ceramic decoupling capacitors as close as possible to the AVCC pin (pin 23) and a separate 100 nF capacitor on DVCC (pin 22). Add a 10 µF tantalum or ceramic bulk capacitor on each supply rail within 25 mm of the IC. According to the Analog Devices AD7862 datasheet, ripple on AVCC directly couples into the conversion result, so use a low-noise LDO (such as ADP3303 or similar) rather than a switching regulator for the ADC supply.
Separate analog and digital ground planes on the PCB, joining them only at the AD7862 AGND/DGND pins (pins 5 and 21). Keep digital data bus traces (DB0-DB11) and clock signals away from the analog input pins (VA1, VA2, VB1, VB2). Use a guard ring around the analog input traces connected to AGND to minimize digital-noise coupling. The Analog Devices evaluation board layout (AD7862-EB) demonstrates the recommended 4-layer stackup with embedded ground planes.
Drive the CLK pin (pin 28) with a clean CMOS clock source - jitter on CLK directly degrades SNR and aperture timing. Use a 50% duty-cycle clock between 1 MHz and 5 MHz (typical 4 MHz for 250 kSPS throughput). Route the BUSY signal (pin 27) and CONVST (pin 24) as short traces to the controlling DSP or FPGA; long traces on these hand-shake signals can cause timing violations at high sample rates.
Do not apply voltages beyond ±15 V on the analog inputs (VA1, VA2, VB1, VB2) - the datasheet specifies ±15 V absolute maximum with input-current-limiting resistors. Ensure CS (pin 25) is held high when not actively reading the part; leaving CS floating can cause spurious reads on the parallel bus. The REFOUT pin (pin 7) should be bypassed with a 100 nF ceramic capacitor if used externally, otherwise left unconnected to avoid loading the internal reference.
Informações de conformidade
RoHS compliance not explicitly stated in verified web data - choose the AD7862ARSZ-2REEL (Z suffix indicates RoHS-compliant terminal finish) for confirmed RoHS. AEC-Q100 qualification not specified; this part is industrial-grade only. Verify compliance status with Analog Devices product documentation before finalizing the BOM.