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Analog Devices Inc. AD7892AR-2REEL7
- Part No.:
- AD7892AR-2REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7892AR-2REEL7.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,468
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Product details
Overview
AD7892AR-2REEL7 from Analog Devices is a 12-bit, single-supply, serial/parallel interface analog-to-digital converter optimized for unipolar 0 V to +2.5 V input ranges and 500 kSPS throughput. It integrates on-chip track/hold, internal +2.5 V reference, and LC2MOS process technology, enabling low-power (60 mW typ) operation in industrial data acquisition and portable instrumentation systems.
For engineers reviewing the AD7892AR-2REEL7 datasheet, AD7892AR-2REEL7 pinout, AD7892AR-2REEL7 application, or AD7892AR-2REEL7 equivalent, key selection considerations include its SOIC-24 package, 500 kSPS conversion rate, ±1 LSB relative accuracy (B-grade), unipolar straight-binary output coding, and dual-interface flexibility with MODE-selectable serial (RFS/SCLK/SDATA) or parallel (DB0–DB11) data transfer.
Technical Context
The AD7892AR-2REEL7 implements a successive approximation ADC architecture with a 1.6 µs max conversion time and 400 ns min track/hold acquisition time, supporting deterministic timing for real-time sampling at 500 kSPS. Its LC2MOS process combines precision bipolar front-end circuitry with low-power CMOS logic, enabling stable DC accuracy (±5 LSB full-scale error, ±4 LSB unipolar offset error) alongside dynamic performance (70 dB SNR, –78 dB THD).
Interface operation is controlled by the MODE pin: high for 12-bit parallel output (DB0–DB11, three-state TTL-compatible), low for three-wire serial mode (RFS as frame sync, SCLK as clock, SDATA as serial output). The REF OUT/REF IN pin supports either internal +2.5 V reference (±10 mV @ 25°C, 25 ppm/°C TC) or external reference overdrive, with buffered input impedance of 1.6 kΩ min.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees monotonic output and no missing codes across full operating range. |
| Sampling Rate | 500 kSPS - enables real-time capture of signals up to 250 kHz Nyquist bandwidth. |
| Analog Input Range | 0 V to +2.5 V - unipolar range referenced to VIN2 (AGND), suitable for sensor outputs and DAC feedback loops. |
| Reference Source | Internal +2.5 V (±10 mV @ 25°C) - eliminates need for external reference unless tighter tolerance required. |
| Power Consumption | 60 mW typical at +5 V - supports battery-powered or thermally constrained embedded designs. |
| Output Coding | Straight (natural) binary - simplifies firmware interpretation without two's complement sign handling. |
| DC Accuracy | ±1 LSB relative accuracy (B-grade) - ensures consistent linearity for calibration-sensitive measurement systems. |
Pinout & Package
AD7892AR-2REEL7 is housed in a 24-lead SOIC (R-24) package with standard 0.3" body width and 0.050" lead pitch. Pin 1 is located at the top-left corner (notch or dot indicator), and the package is RoHS-compliant per Analog Devices' ordering guide.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply | +5 V ±5% main power rail; decoupling capacitor required near pin. |
| STANDBY (Pin 2) | Power control input | Logic high = active mode; logic low = standby (75 µW typ), enabling rapid wake-up (<30 µs delay before next CONVST). |
| VIN2 (Pin 3) | Analog reference node | Must be tied to AGND for AD7892AR-2; floating or other potentials invalid. |
| VIN1 (Pin 4) | Main analog input | Accepts 0 V to +2.5 V unipolar signal; input resistance 8 kΩ min, current ≤10 nA max. |
| REF OUT/REF IN (Pin 5) | Reference interface | Provides internal +2.5 V reference or accepts external source; requires 0.1 µF ceramic cap to AGND when using internal ref. |
| AGND (Pin 6) | Analog ground | Separate ground return for analog circuitry; must be star-connected to DGND at single point. |
| MODE (Pin 7) | Interface select | Logic high = parallel mode (DB0–DB11 active); logic low = serial mode (RFS/SCLK/SDATA active). |
| DB11/LOW (Pin 8) | Data bit / test pin | In parallel mode: MSB output; in serial mode: must be tied low for correct operation. |
| DB10/LOW (Pin 9) | Data bit / test pin | In parallel mode: DB10 output; in serial mode: must be tied low. |
| DB0 (Pin 20) | LSB output | Three-state TTL-compatible; straight-binary coding; floats when RD/CS inactive. |
| RD (Pin 21) | Read strobe | Active-low control; latches valid data onto DB0–DB11 when CS is also low. |
| CS (Pin 22) | Chip select | Active-low enable; must be asserted with RD to drive data bus; supports multi-device sharing. |
| EOC (Pin 23) | Conversion status | Active-low pulse (~100 ns wide) indicates completion; usable as interrupt trigger for microcontrollers. |
| CONVST (Pin 24) | Start conversion | Rising-edge triggered; initiates track→hold transition and starts 1.6 µs conversion sequence. |
Key Features
| Feature | Design Value |
|---|---|
| Single +5 V supply operation | Eliminates dual-rail power design complexity and reduces BOM cost in portable and space-constrained systems. |
| On-chip track/hold amplifier | Acquires input to 12-bit accuracy in ≤400 ns, enabling accurate digitization of fast-changing sensor or control signals. |
| Dual serial/parallel interface | Reduces system-level interface redesign: MODE pin selects between microcontroller serial ports or FPGA parallel buses. |
| Internal +2.5 V reference | Removes external reference component while maintaining ±10 mV initial accuracy and 25 ppm/°C drift for stable gain calibration. |
| Low-power standby mode | Draws only 80 µA max (15 µA typ), extending battery life in intermittent-sampling applications like environmental monitors. |
Applications
| Industrial Process Monitoring | Portable Data Loggers |
|---|---|
Use Scenario: Continuous monitoring of 4–20 mA current-loop transmitters converted to voltage via precision shunt resistors. IC Role / Device Role / Timing Role: ADC front-end digitizing conditioned analog signals at 500 kSPS with unipolar 0 V to +2.5 V range matching DAC output compliance. Use Value: Straight-binary output simplifies firmware scaling; internal reference ensures consistent full-scale definition across temperature without external trimming. | Use Scenario: Battery-powered field instruments capturing temperature, humidity, and pressure sensor outputs over extended periods. IC Role / Device Role / Timing Role: Low-power 12-bit ADC performing burst-mode sampling with STANDBY-controlled duty cycling to extend operational life. Use Value: 60 mW typical active power and 75 µW standby power minimize energy drain; SOIC-24 package supports compact PCB layout. |
| Automated Test Equipment (ATE) Front-End | Motor Control Feedback Sensing |
Use Scenario: High-speed acquisition of analog stimulus-response waveforms during functional testing of DUTs. IC Role / Device Role / Timing Role: Precision ADC synchronizing with system clock via CONVST/EOC handshaking for deterministic sample alignment. Use Value: ±1 LSB relative accuracy and 70 dB SNR ensure measurement repeatability; parallel interface enables direct FPGA register readout. | Use Scenario: Sampling current-sense amplifier outputs in closed-loop motor drives for real-time torque and speed regulation. IC Role / Device Role / Timing Role: Unipolar ADC interfacing with isolated amplifiers delivering 0–2.5 V representations of phase currents. Use Value: 400 ns track/hold acquisition time supports accurate sampling within PWM dead-time windows; SOIC package aids thermal management near power stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, unipolar-input ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7892BR-2 | B-grade (±1 LSB relative accuracy) vs. A-grade AD7892AR-2; identical pinout, timing, and SOIC-24 package. | Higher DC precision required for calibration-critical systems where ±1 LSB linearity is mandatory. | Select AD7892BR-2 when absolute linearity specification must meet ±1 LSB across temperature without post-calibration. |
| ADS7822U | 12-bit, 200 kSPS, SPI-only interface, +2.7 V to +5.25 V supply; no internal reference; requires external REF. | Lower sampling rate acceptable; system already uses SPI infrastructure and external precision reference (e.g., REF5025). | Choose ADS7822U for cost-sensitive, SPI-native designs where reduced throughput and external reference are acceptable trade-offs. |
Compared with AD7892BR-2, the AD7892AR-2REEL7 offers relaxed linearity (±1.5 LSB) at lower cost, while ADS7822U trades speed and integrated reference for SPI simplicity and wider supply range-making each suitable for distinct system architecture priorities.
Availability
AD7892AR-2REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, and automated test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7892AR-2REEL7 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 high-speed, low-power, single-supply ADCs with integrated references and flexible interfaces for precision data acquisition in resource-constrained environments.
FAQ
What is the maximum sampling rate supported by the AD7892AR-2REEL7?
The AD7892AR-2REEL7 supports a maximum throughput rate of 500 kSPS, achieved with a 1.6 µs conversion time and 400 ns track/hold acquisition time. This rate is guaranteed for the AD7892-2 variant under specified operating conditions (VDD = +5 V ±5%, TA = –40°C to +85°C), and enables accurate digitization of signals up to 250 kHz per Nyquist criterion. The AD7892AR-2REEL7 does not support the 600 kSPS rate of the AD7892-3 variant.
Does the AD7892AR-2REEL7 require an external reference voltage?
No, the AD7892AR-2REEL7 includes an internal +2.5 V reference accessible via the REF OUT/REF IN pin, which meets typical system requirements with ±10 mV initial error at +25°C and 25 ppm/°C temperature coefficient. An external reference is optional and only needed when tighter initial accuracy or lower drift is required-such as in metrology-grade instruments. When using the internal reference, a 0.1 µF ceramic capacitor must be placed between REF OUT/REF IN and AGND.
How is the analog input range configured for the AD7892AR-2REEL7?
The AD7892AR-2REEL7 is factory-configured for the AD7892-2 variant, which specifies a unipolar 0 V to +2.5 V input range on VIN1, with VIN2 required to be connected to AGND. This configuration is fixed by the part number suffix "-2" and cannot be altered externally. Unlike the AD7892-1 or AD7892-3 variants, the AD7892AR-2REEL7 does not support ±10 V, ±5 V, or ±2.5 V ranges-the input range is strictly 0 V to +2.5 V referenced to AGND.
What interface modes does the AD7892AR-2REEL7 support, and how are they selected?
The AD7892AR-2REEL7 supports both parallel and serial interfaces, selected by the MODE pin: logic high enables 12-bit parallel output on DB0–DB11, while logic low activates the three-wire serial interface (RFS, SCLK, SDATA). In serial mode, pins DB11/LOW and DB10/LOW must be tied low. The interface mode is hardware-configured at power-up and remains static during operation-no software reconfiguration is possible. Both modes share the same CONVST, EOC, RD, and CS timing relationships.
What is the power consumption profile of the AD7892AR-2REEL7 in active and standby modes?
In normal operation, the AD7892AR-2REEL7 consumes 18 mA typical (90 mW at +5 V), with a maximum of 19 mA. In standby mode (STANDBY = low), it draws 80 µA maximum (75 µW at +5 V), typically 15 µA. A minimum 30 µs delay is required after exiting standby before issuing the next CONVST pulse. These values are specified for the AD7892-2 variant and confirmed in the AD7892AR-2REEL7 datasheet under VDD = +5 V ±5% and TA = –40°C to +85°C.
AD7892AR-2REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- Data Interface:
- SPI, Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7892AR-2REEL7 FAQ
1.How can I place an order for AD7892AR-2REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7892AR-2REEL7 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-2REEL7 reliable?
The price and inventory of AD7892AR-2REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7892AR-2REEL7 is usually 5 days.
3.What payment methods are accepted for AD7892AR-2REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7892AR-2REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7892AR-2REEL7?
AD7892AR-2REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7892AR-2REEL7 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-2REEL7?
For technical support, including AD7892AR-2REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7892AR-2REEL7 requirements.
6.How does Aetrix verify that AD7892AR-2REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7892AR-2REEL7 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-2REEL7 meets industry standards.
7.What is the process for return or replacement of AD7892AR-2REEL7?
All AD7892AR-2REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7892AR-2REEL7, 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-2REEL7 part is unused and in its original packaging.
Return procedure for AD7892AR-2REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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