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Analog Devices Inc. AD7863BR-3REEL7
- Part No.:
- AD7863BR-3REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7863BR-3REEL7.pdf
- Description:
- IC ADC 14BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,073
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Product details
Overview
AD7863BR-3REEL7 from Analog Devices is a dual-channel, simultaneous-sampling 14-bit analog-to-digital converter (ADC) operating from a single 5 V supply. It delivers 175 kSPS throughput per channel, 5.2 μs conversion time, ±2.5 V input range, and integrated 2.5 V reference - enabling precise phase-coherent acquisition in motor control feedback loops.
For engineers reviewing the AD7863BR-3REEL7 datasheet, AD7863BR-3REEL7 pinout, AD7863BR-3REEL7 application, or AD7863BR-3REEL7 equivalent, key selection criteria include simultaneous sampling capability, aperture delay matching (<350 ps), dual-channel isolation (−86 dB), parallel interface timing compliance, and ±2.5 V bipolar input support for signal processing systems.
Technical Context
The AD7863BR-3REEL7 integrates two independent successive approximation ADCs with matched track-and-hold amplifiers, enabling true simultaneous sampling of VA1/VA2 or VB1/VB2 pairs. Its internal 2.5 V reference (±10 mV error at 25°C, 25 ppm/°C TC) feeds both converters without external components.
Conversion is initiated by a falling edge on CONVST, triggering concurrent hold and conversion across both channels. BUSY goes high at CONVST fall and returns low after 5.2 μs, signaling availability of first result (VA1/VB1); second read yields VA2/VB2. Data is output via 14-bit parallel bus (DB0–DB13) with CS/RD handshaking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees monotonicity and no missing codes over full temperature range. |
| Sampling Rate | 175 kSPS per channel - supports real-time closed-loop control up to ~87 kHz Nyquist bandwidth. |
| Conversion Time | 5.2 μs - enables minimum inter-conversion interval of 5.7 μs (including 400 ns quiet time). |
| Analog Input Range | ±2.5 V - matches common DSP and op-amp signal chain levels; overvoltage tolerance ±7 V prevents damage during transients. |
| SNR | 77 dB min (fIN = 80 kHz) - supports >12.5 ENOB for high-fidelity waveform capture. |
| Channel Isolation | −86 dB - ensures minimal crosstalk between A/B channel pairs during simultaneous acquisition. |
| Aperture Matching | 350 ps max - preserves sub-degree phase alignment between sampled signals for vector control accuracy. |
Pinout & Package
AD7863BR-3REEL7 is housed in a 28-lead SOIC_W (wide-body) package with standard 0.3-inch width and 0.050-inch lead pitch, compatible with automated SMT assembly and IPC-7351B footprint IPC7351SOIC28W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start Input | Falling-edge-triggered global sample command - simultaneously freezes both track/holds and initiates dual conversion. |
| BUSY | Conversion Status Output | Active-high open-drain signal indicating conversion in progress; transitions low when first result is ready. |
| A0 | Multiplexer Select | Static channel selector - low = VA1/VA2, high = VB1/VB2; latched at CONVST fall for deterministic channel assignment. |
| CS, RD | Parallel Interface Controls | Standard microprocessor handshake - CS enables device, RD clocks data out on falling edge; supports 80C196, MC68000, and ADSP interfaces. |
| VA1, VA2, VB1, VB2 | Differential Analog Inputs | Four dedicated inputs grouped into two isolated 2-input channels; each pair shares common-mode rejection and gain matching. |
| VREF | Reference I/O | 2.5 V internal reference output (5.5 kΩ source impedance); also accepts external 2.5 V ±5% reference for improved stability. |
| DB0–DB13 | Parallel Data Bus | 14-bit three-state TTL outputs - DB13 is MSB; coding is twos complement for AD7863-3 variant. |
| AGND, DGND | Separate Ground Planes | Isolated analog/digital grounds minimize noise coupling; require star-point connection at single PCB location. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling | Two matched track/hold amplifiers acquire VA1/VA2 or VB1/VB2 at identical instants - preserves phase coherence for vector motor control and power quality analysis. |
| Integrated Reference | On-chip 2.5 V bandgap reference (±10 mV @ 25°C, 25 ppm/°C) eliminates external reference IC and reduces BOM count while maintaining ±2 LSB gain error spec. |
| Low-Power Operation | 70 mW typical at 175 kSPS (16 mA IDD), dropping to 105 μW in auto-power-down mode - extends battery life in portable test equipment. |
| Overvoltage Protection | Analog inputs withstand ±7 V (AD7863-3) without latch-up or parametric shift - simplifies front-end protection design in industrial I/O modules. |
| High-Speed Parallel Interface | Full 14-bit bus with <35 ns CONVST pulse width and <45 ns RD pulse width - interfaces directly to legacy microcontrollers without glue logic. |
Applications
| Motor Control Feedback | Power Quality Monitoring |
|---|---|
Use Scenario: Real-time acquisition of current and voltage waveforms in three-phase inverter drives for field-oriented control (FOC). IC Role / Device Role / Timing Role: Dual simultaneous sampling ADC capturing IA/IB and VA/VB pairs within <350 ps aperture skew to compute instantaneous torque and flux vectors. Use Value: Enables sub-microsecond phase alignment critical for <1° electrical angle resolution in servo positioning systems. | Use Scenario: Simultaneous measurement of line voltage and neutral current harmonics in smart grid metering terminals. IC Role / Device Role / Timing Role: High-fidelity digitization of 50/60 Hz fundamentals plus 25th harmonic (3 kHz) with 77 dB SNR and −86 dB channel isolation. Use Value: Supports IEC 61000-4-7 Class A compliance for harmonic group analysis without external anti-alias filtering. |
| Medical Ultrasound Beamforming | Test & Measurement Digitizers |
Use Scenario: Channel-paired echo signal sampling in phased-array ultrasound receivers requiring precise time-of-flight correlation. IC Role / Device Role / Timing Role: Simultaneous capture of adjacent transducer element return signals (e.g., VA1/VA2) to preserve spatial coherence for digital beam steering. Use Value: Aperture delay matching <350 ps enables <0.1 mm axial resolution at 5 MHz center frequency. | Use Scenario: Dual-channel oscilloscope front-end for differential signal analysis in benchtop analyzers. IC Role / Device Role / Timing Role: Independent but synchronized digitization of probe reference and DUT response using VA1/VB1 or VA2/VB2 pairs. Use Value: Eliminates interleaving artifacts and supports true Lissajous display of phase relationships up to 80 kHz input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7656ASTZ | 6-channel, 16-bit, 250 kSPS, SPI interface, no internal reference - requires external REF and level-shifting for 5 V logic. | Higher resolution and channel count, but lacks native 14-bit ±2.5 V bipolar range and parallel bus compatibility. | Choose AD7656ASTZ only if 16-bit resolution and six-channel sampling outweigh interface redesign effort and increased BOM cost. |
| ADS8556IPMR | 6-channel, 16-bit, 630 kSPS, parallel interface, ±10 V input - uses external reference and consumes 120 mW at full rate. | Superior speed and channel density, but higher power and no ±2.5 V option; aperture matching not specified. | Select ADS8556IPMR when system demands >175 kSPS per channel and can accommodate larger footprint and thermal management. |
Compared with AD7863BR-3REEL7, AD7656ASTZ offers higher resolution but requires SPI firmware integration and external reference design, while ADS8556IPMR delivers greater throughput at the cost of power efficiency and input range flexibility - making AD7863BR-3REEL7 optimal for cost-sensitive, phase-critical 14-bit dual-channel systems with existing 5 V parallel bus infrastructure.
Availability
AD7863BR-3REEL7 is available at Aetrix Electronics and suitable for motor control feedback, power quality monitoring, medical ultrasound beamforming, and test & measurement digitizers requiring stable component supply and long-term obsolescence planning.
Supply support for AD7863BR-3REEL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD7863 product line was engineered specifically for high-fidelity, phase-coherent multichannel data acquisition in real-time control and instrumentation - emphasizing simultaneous sampling integrity, low power, and seamless microprocessor interfacing.
FAQ
What is the maximum sampling rate supported by the AD7863BR-3REEL7?
The AD7863BR-3REEL7 supports a maximum sampling rate of 175 kSPS per channel in Mode 1 operation. This is achieved with a 5.2 μs conversion time and requires adherence to the 400 ns quiet time before the next CONVST pulse. The part's timing specifications ensure reliable operation at this rate across the full −40°C to +85°C temperature range when proper decoupling and grounding are implemented.
Does the AD7863BR-3REEL7 require an external reference voltage?
No, the AD7863BR-3REEL7 includes an internal 2.5 V reference with ±10 mV accuracy at 25°C and 25 ppm/°C temperature coefficient. It can be used directly by connecting two 0.1 μF ceramic capacitors from VREF to AGND. An external 2.5 V reference may be substituted via the VREF pin if tighter initial accuracy or lower drift is required, but it is not mandatory for AD7863BR-3REEL7 operation.
How does the AD7863BR-3REEL7 handle simultaneous sampling of two analog inputs?
The AD7863BR-3REEL7 uses two matched track-and-hold amplifiers that respond identically to the falling edge of CONVST, freezing both selected input pairs (VA1/VA2 or VB1/VB2) at precisely the same instant. Aperture delay matching is guaranteed ≤350 ps, preserving relative phase information essential for vector control and coherent signal analysis - a capability confirmed in the AD7863BR-3REEL7 datasheet's dynamic specifications table.
What are the power consumption characteristics of the AD7863BR-3REEL7 in active and power-down modes?
In normal Mode 1 operation, the AD7863BR-3REEL7 draws 16 mA typical (84 mW at 5 V), dropping to 20 μA maximum (105 μW) in power-down Mode 2. The automatic wake-up feature activates the ADC just before the next CONVST edge, minimizing idle current without sacrificing timing predictability - a key advantage for battery-powered AD7863BR-3REEL7 deployments.
Can the AD7863BR-3REEL7 interface directly with an 80C196 microcontroller?
Yes, the AD7863BR-3REEL7 is explicitly validated for direct interface with the Intel 80C196 microcontroller, as documented in the "Microprocessor Interfacing" section of its datasheet. Its parallel 14-bit bus, CS/RD handshaking, and 35 ns minimum CONVST pulse width align with 80C196 timing requirements - eliminating need for address latches or wait-state generators in AD7863BR-3REEL7-based designs.
AD7863BR-3REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 175k
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 2
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7863BR-3REEL7 FAQ
1.How can I place an order for AD7863BR-3REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7863BR-3REEL7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD7863BR-3REEL7 reliable?
The price and inventory of AD7863BR-3REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7863BR-3REEL7 is usually 5 days.
3.What payment methods are accepted for AD7863BR-3REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7863BR-3REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7863BR-3REEL7?
AD7863BR-3REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7863BR-3REEL7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD7863BR-3REEL7?
For technical support, including AD7863BR-3REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7863BR-3REEL7 requirements.
6.How does Aetrix verify that AD7863BR-3REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7863BR-3REEL7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD7863BR-3REEL7 meets industry standards.
7.What is the process for return or replacement of AD7863BR-3REEL7?
All AD7863BR-3REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7863BR-3REEL7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD7863BR-3REEL7 part is unused and in its original packaging.
Return procedure for AD7863BR-3REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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