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Analog Devices Inc. AD7892AR-2REEL
- Part No.:
- AD7892AR-2REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7892AR-2REEL.pdf
- Description:
- IC ADC 12BIT LP 500KSPS 24-SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AD7892AR-2REEL from Analog Devices is a 12-bit, single-supply successive approximation ADC with 500 kSPS throughput, ±1 LSB relative accuracy, 0 V to +2.5 V unipolar input range, and dual serial/parallel interface capability. It integrates on-chip track/hold, internal +2.5 V reference, and low-power operation (60 mW typ) for embedded data acquisition in portable instrumentation and industrial control systems.
For engineers reviewing the AD7892AR-2REEL datasheet, AD7892AR-2REEL pinout, AD7892AR-2REEL application, or AD7892AR-2REEL equivalent, key selection factors include its SOIC-24 package, unipolar 0–2.5 V input compliance, standby current of 250 µA typ, 1.6 µs conversion time, and compatibility with microcontrollers via MODE-selectable serial (RFS/SCLK/SDATA) or parallel (DB0–DB11) interfaces.
Technical Context
The AD7892AR-2REEL implements a 12-bit SAR architecture with integrated track/hold amplifier and programmable interface mode controlled by the MODE pin. Its analog front-end supports only unipolar 0 V to +2.5 V input on VIN1 (VIN2 grounded), with input resistance ≥8 kΩ and overvoltage tolerance of –0.3 V to VDD on VIN1.
It uses an internal +2.5 V reference (±10 mV @ +25°C, 25 ppm/°C TC) accessible at REF OUT/REF IN, and features TTL-compatible three-state digital outputs. Conversion is initiated by CONVST rising edge; EOC falling pulse signals completion; RD/CS enable parallel readout; RFS/SCLK/SDATA support 16-bit serial frame (4 leading zeros + 12-bit natural binary output).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes across full operating temperature range. |
| Throughput Rate | 500 kSPS - determined by 1.6 µs conversion time + 400 ns track/hold acquisition time. |
| Analog Input Range | 0 V to +2.5 V - unipolar range referenced to AGND; VIN2 must be grounded. |
| Reference Voltage | +2.5 V nominal - internal buffered reference with ±10 mV error at +25°C; external reference supported. |
| Power Consumption | 60 mW typical at +5 V - corresponds to 12 mA supply current; drops to 1.25 mW in standby mode. |
| DC Accuracy | ±5 LSB positive full-scale error, ±4 LSB unipolar offset error - specified over –40°C to +85°C. |
| Digital Interface | MODE-selectable parallel (12-bit DB0–DB11) or serial (RFS/SCLK/SDATA) - supports direct connection to MCU serial ports or 8/16-bit buses. |
Pinout & Package
AD7892AR-2REEL is housed in a 24-lead SOIC (R-24) package with standard 0.3" width and gull-wing leads. Pin 1 is located at top-left corner when notch is oriented upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive Supply | +5 V ±5% main power rail; powers analog and digital sections. |
| STANDBY (Pin 2) | Power Control | Logic high = active mode; logic low = standby (250 µA typ for AD7892-2). |
| VIN2 (Pin 3) | Analog Reference Node | Must be connected to AGND for AD7892AR-2REEL's 0–2.5 V input configuration. |
| VIN1 (Pin 4) | Main Analog Input | Accepts 0 V to +2.5 V unipolar signal; input impedance ≥8 kΩ. |
| REF OUT/REF IN (Pin 5) | Reference I/O | Provides +2.5 V internal reference or accepts external 2.375–2.625 V source. |
| AGND (Pin 6) | Analog Ground | Separate ground return for track/hold, DAC, and comparator; must be isolated from DGND. |
| MODE (Pin 7) | Interface Selector | High = parallel mode (DB0–DB11 active); low = serial mode (RFS/SCLK/SDATA active). |
| DB11/LOW (Pin 8) | Data Bit 11 / Test | In parallel mode: MSB output; in serial mode: must be tied low for correct operation. |
| DB10/LOW (Pin 9) | Data Bit 10 / Test | In parallel mode: DB10 output; in serial mode: must be tied low. |
| DB0 (Pin 20) | Data Bit 0 (LSB) | Natural binary coding for AD7892-2; three-state TTL-compatible output. |
| RD (Pin 21) | Read Strobe | Active-low control enabling data bus output during parallel read cycles. |
| CS (Pin 22) | Chip Select | Active-low enable synchronized with RD to gate parallel data output. |
| EOC (Pin 23) | End-of-Conversion | Active-low pulse (~100 ns wide) signaling valid data ready in output register. |
| CONVST (Pin 24) | Convert Start | Rising-edge-triggered command initiating track-to-hold transition and ADC conversion. |
Key Features
| Feature | Design Value |
|---|---|
| Single +5 V supply operation | Eliminates need for dual-rail or negative supplies in battery-powered or space-constrained systems. |
| On-chip track/hold amplifier | Acquires 0–2.5 V input to 12-bit accuracy within 400 ns, enabling accurate sampling of fast transients. |
| Flexible dual-interface architecture | Reduces BOM count and PCB complexity by supporting either parallel bus or 3-wire serial connection without external logic. |
| Low-power standby mode | Draws only 250 µA typical, extending battery life in intermittent-sampling applications like sensor nodes. |
| Integrated +2.5 V reference | Provides stable, factory-trimmed reference with <±10 mV initial error-reduces external component count and layout sensitivity. |
Applications
| Portable Data Loggers | Industrial Process Monitoring |
|---|---|
Use Scenario: Battery-powered environmental sensors logging temperature, pressure, and humidity at 100–500 Hz sample rates. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned 0–2.5 V sensor outputs; CONVST triggered by timer interrupt; EOC used for DMA-ready signaling. Use Value: 500 kSPS throughput and 250 µA standby current enable >1-year battery life while maintaining 12-bit resolution for calibrated sensor readings. |
Use Scenario: PLC analog input modules acquiring voltage signals from 4–20 mA transmitters via precision resistor networks. IC Role / Device Role / Timing Role: High-accuracy front-end ADC accepting 0–2.5 V scaled outputs; MODE set to parallel for fast CPU polling; REF OUT stabilizes gain calibration. Use Value: ±5 LSB full-scale error and ±4 LSB offset error ensure <0.1% system-level measurement uncertainty across –40°C to +85°C industrial temperature range. |
| Medical Instrumentation Front-End | Test & Measurement Equipment |
Use Scenario: Portable ECG or pulse oximeter units digitizing amplified biopotential signals with DC-coupled amplification. IC Role / Device Role / Timing Role: Unipolar ADC capturing 0–2.5 V baseline-shifted bio-signals; STANDBY toggled between patient measurements to conserve energy. Use Value: On-chip track/hold and 12-bit linearity preserve waveform fidelity for diagnostic analysis without external sample-hold circuitry. |
Use Scenario: Benchtop multimeters and automated test equipment requiring fast, repeatable DC voltage measurements. IC Role / Device Role / Timing Role: Precision digitizer interfaced via parallel bus to FPGA controller; internal reference used for self-calibration routines. Use Value: Internal +2.5 V reference with 25 ppm/°C TC enables stable 12-bit measurements over ambient temperature swings without external ovenized references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit unipolar ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7892BR-2 | Same SOIC-24 package and 0–2.5 V input range, but specified for ±1 LSB relative accuracy (vs. unspecified for AD7892AR-2REEL). | Preferred where tighter DC linearity is required for calibration-critical systems. | Select AD7892BR-2 if ±1 LSB relative accuracy is mandatory; otherwise AD7892AR-2REEL offers cost-optimized performance. |
| ADS7822U | 12-bit, 200 kSPS, SPI-only interface, 2.7–5.5 V supply, 0–VREF input (VREF up to 5 V), no internal reference. | Suited for lower-speed, SPI-native designs where external reference flexibility and wider supply range are prioritized. | Choose ADS7822U for SPI-centric microcontroller platforms needing variable reference voltage; AD7892AR-2REEL better fits parallel-bus or dual-interface requirements. |
Compared with AD7892BR-2, AD7892AR-2REEL trades guaranteed ±1 LSB linearity for lower cost while retaining identical timing, packaging, and functional interface; versus ADS7822U, it delivers 2.5× higher throughput and integrated reference at the expense of SPI-only constraint and no supply voltage flexibility.
Availability
AD7892AR-2REEL is available at Aetrix Electronics and suitable for portable instrumentation, industrial process monitoring, and medical front-end designs requiring stable component supply, long-term obsolescence management, and RoHS-compliant SOIC packaging.
Supply support for AD7892AR-2REEL 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7892 product line delivers single-supply, low-power, high-speed 12-bit ADCs optimized for embedded data acquisition where integration of track/hold, reference, and flexible digital interface reduces system complexity and board area.
FAQ
What input voltage range does the AD7892AR-2REEL support?
The AD7892AR-2REEL supports a unipolar 0 V to +2.5 V analog input range on VIN1, with VIN2 required to be connected to AGND. This configuration is fixed for the -2 variant and differs from the ±10 V (–1) or ±2.5 V (–3) ranges of other AD7892 versions. Input overvoltage tolerance is –0.3 V to VDD.
Does the AD7892AR-2REEL include an internal voltage reference?
Yes, the AD7892AR-2REEL includes an internal +2.5 V reference accessible at the REF OUT/REF IN pin. It exhibits ±10 mV maximum error at +25°C, 25 ppm/°C typical temperature coefficient, and ±25 mV max error over –40°C to +85°C. A 0.1 µF ceramic capacitor to AGND is required for stability when using the internal reference.
How is the digital interface mode selected on the AD7892AR-2REEL?
The MODE pin (Pin 7) selects the interface mode: logic high enables the 12-bit parallel interface (DB0–DB11 active), while logic low enables the three-wire serial interface (RFS, SCLK, SDATA active). In serial mode, DB11/LOW and DB10/LOW must be tied low; unused parallel pins should remain unconnected.
What is the power consumption of the AD7892AR-2REEL in standby mode?
The AD7892AR-2REEL draws 250 µA typical (100 µA max) in standby mode when STANDBY is pulled low. This reduces total power dissipation to approximately 1.25 mW at +5 V, making it suitable for battery-operated systems requiring periodic wake-up and conversion cycles.
Is the AD7892AR-2REEL pin-compatible with other AD7892 variants?
Yes, all AD7892 variants-including AD7892AR-2REEL-are pin-compatible within the same package type (SOIC-24). The pin functions, electrical characteristics, and timing parameters are identical across -1, -2, and -3 versions; only the analog input range, conversion speed, and DC accuracy specifications differ.
AD7892AR-2REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7892AR-2REEL FAQ
1.How can I place an order for AD7892AR-2REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7892AR-2REEL 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 AD7892AR-2REEL reliable?
The price and inventory of AD7892AR-2REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7892AR-2REEL is usually 5 days.
3.What payment methods are accepted for AD7892AR-2REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7892AR-2REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7892AR-2REEL?
AD7892AR-2REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7892AR-2REEL 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 AD7892AR-2REEL?
For technical support, including AD7892AR-2REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7892AR-2REEL requirements.
6.How does Aetrix verify that AD7892AR-2REEL is sourced from the original manufacturer or authorized distributors?
All AD7892AR-2REEL 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 AD7892AR-2REEL meets industry standards.
7.What is the process for return or replacement of AD7892AR-2REEL?
All AD7892AR-2REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7892AR-2REEL, 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 AD7892AR-2REEL part is unused and in its original packaging.
Return procedure for AD7892AR-2REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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