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Analog Devices Inc. AD7892AR-2
- Part No.:
- AD7892AR-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7892AR-2.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,142
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Product details
Overview
AD7892AR-2 from Analog Devices is a 12-bit, single-supply successive approximation ADC with 500 kSPS throughput, 0 V to +2.5 V unipolar input range, on-chip track/hold amplifier, and dual serial/parallel interface. It operates from +5 V ±5%, consumes 60 mW typical, and targets precision data acquisition in portable instrumentation and industrial control systems.
For engineers reviewing the AD7892AR-2 datasheet, AD7892AR-2 pinout, AD7892AR-2 application, or AD7892AR-2 equivalent, key selection criteria include unipolar input range compatibility, 12-bit relative accuracy (±1.5 LSB max), standby current (250 µA typ), SOIC-24 package constraints, and interface mode selection via MODE pin.
Technical Context
The AD7892AR-2 implements a 1.6 µs conversion time with 400 ns track/hold acquisition time, enabling 500 kSPS sustained sampling. Its LC2MOS process integrates bipolar precision circuitry with CMOS logic for low power and high DC accuracy.
It features a single +2.5 V reference pin (REF OUT/REF IN) supporting internal reference use (±10 mV error at +25°C) or external overdrive, and supports straight binary output coding optimized for unipolar signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes across full operating temperature range. |
| Sampling Rate | 500 kSPS - maximum sustained throughput with 1.6 µs conversion + 400 ns acquisition timing. |
| Analog Input Range | 0 V to +2.5 V on VIN1 (with VIN2 grounded) - unipolar range requiring no level-shifting for sensor outputs referenced to ground. |
| DC Accuracy | ±1.5 LSB relative accuracy max - ensures monotonicity and <0.037% full-scale linearity error in closed-loop control feedback paths. |
| Power Consumption | 60 mW typical at +5 V - enables battery-powered operation with 12-bit resolution without thermal derating in SOIC-24 package. |
| Standby Current | 250 µA typical - reduces system idle power by >99% vs active mode, critical for duty-cycled sensor nodes. |
| Reference Output | +2.5 V ±10 mV at +25°C - stable internal reference eliminates need for external voltage reference in cost-sensitive designs. |
Pinout & Package
AD7892AR-2 is housed in a 24-lead SOIC (R-24) package with standard 0.3" width and 0.050" lead pitch. Thermal impedance is 75°C/W (θJA), supporting operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 | Analog input (unipolar) | Main signal input accepting 0 V to +2.5 V range; must be driven within 50 mV of AGND on VIN2 for specified accuracy. |
| REF OUT/REF IN | Reference I/O | Provides +2.5 V internal reference (decoupled to AGND) or accepts external +2.5 V source; buffers reference for ADC core and attenuator. |
| MODE | Interface select | Logic high = parallel mode (DB0–DB11 active); logic low = serial mode (RFS/SCLK/SDATA active). |
| CONVST | Conversion trigger | Rising-edge sensitive start signal; initiates track-to-hold transition and begins 1.6 µs conversion sequence. |
| EOC | End-of-conversion flag | Active-low pulse (~100 ns wide) signaling valid data ready; used to synchronize RD/CS strobes or generate microcontroller interrupts. |
| RD & CS | Parallel read control | Both low enable three-state DB0–DB11 outputs; timing requires tRD setup before next CONVST edge (200 ns min). |
Key Features
| Feature | Design Value |
|---|---|
| Unipolar 0 V to +2.5 V input range | Eliminates need for external level-shifting circuitry when interfacing with ground-referenced sensors (e.g., RTDs, strain gauges, DAC outputs). |
| Single +5 V supply operation | Removes requirement for dual-rail or negative supplies, simplifying power architecture in embedded controllers and portable test equipment. |
| Dual serial/parallel interface | Reduces BOM count: parallel mode connects directly to 8/16-bit microcontrollers; serial mode uses only RFS/SCLK/SDATA for minimal pin-count MCU integration. |
| On-chip track/hold amplifier | Acquires full-scale 12-bit data within 400 ns, enabling accurate digitization of signals up to ~125 kHz bandwidth without external sample-hold. |
| Internal +2.5 V reference | Provides stable reference with ±25 mV max error over –40°C to +85°C, removing dependency on external precision references in non-critical applications. |
Applications
| Industrial Process Monitoring | Portable Data Loggers |
|---|---|
Use Scenario: Continuous monitoring of 4–20 mA loop transmitters converted to voltage via precision shunt resistor. IC Role / Device Role / Timing Role: ADC front-end digitizing conditioned analog signals at 500 kSPS with 12-bit resolution and unipolar 0–2.5 V range matching DAC output swing. Use Value: Eliminates external level-shifting and reference components, reducing board area and calibration complexity while maintaining ±1.5 LSB linearity over temperature. |
Use Scenario: Battery-powered environmental sensor node acquiring temperature, humidity, and pressure data at sub-Hz to 1 kHz rates. IC Role / Device Role / Timing Role: Low-power ADC entering standby mode between samples; 250 µA typical standby current extends battery life beyond 1 year on two AA cells. Use Value: Combines 12-bit accuracy with ultra-low idle power and single-supply operation-enabling high-resolution logging without DC-DC converters or LDOs. |
| Medical Instrumentation | Automated Test Equipment (ATE) |
Use Scenario: Digitizing ECG amplifier outputs with baseline drift compensation and programmable gain. IC Role / Device Role / Timing Role: Unipolar ADC accepting 0–2.5 V output from PGA stage; straight binary coding simplifies digital filtering and offset correction in FPGA-based processing. Use Value: Internal track/hold acquires fast transient signals (e.g., QRS complex) with <400 ns settling, ensuring no aliasing distortion at 500 kSPS sampling. |
Use Scenario: High-speed functional test of mixed-signal ICs using pattern generators and digitizers. IC Role / Device Role / Timing Role: Parallel-interface ADC synchronized to system clock via CONVST/EOC handshaking; 35 ns data access time enables direct connection to FPGA I/O banks. Use Value: Supports deterministic timing margins in automated test fixtures-t6 ≤ 45 ns and t7 ≥ 5 ns ensure reliable latch capture without added wait states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7892BN-2 | Same SOIC-24 package and 0 V to +2.5 V input range, but specified for ±1 LSB relative accuracy (vs ±1.5 LSB for AD7892AR-2). | Required where tighter linearity is needed for closed-loop servo control or calibration-critical metrology. | Select AD7892BN-2 if absolute linearity error must be ≤±1 LSB; otherwise AD7892AR-2 offers cost advantage with identical timing and interface. |
| ADS7822U | 12-bit, 200 kSPS, SPI-only interface, 2.7–5.25 V supply, 0–VREF input range (VREF = 2.5 V max), 1.25 mW typical power. | Better suited for ultra-low-power, space-constrained designs where serial interface suffices and lower throughput is acceptable. | Choose ADS7822U for battery life optimization below 200 kSPS; AD7892AR-2 remains preferred for 500 kSPS or parallel bus integration. |
Compared with AD7892BN-2, AD7892AR-2 trades ±1 LSB linearity for lower cost while retaining identical timing, packaging, and interface flexibility; versus ADS7822U, it delivers 2.5× higher throughput and dual-interface capability at higher quiescent power.
Availability
AD7892AR-2 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, medical instrumentation, and automated test equipment requiring stable component supply across extended production lifecycles.
Supply support for AD7892AR-2 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 12-bit SAR ADCs with integrated track/hold and flexible interfaces, designed specifically for precision data acquisition in resource-constrained embedded systems.
FAQ
What input voltage range does the AD7892AR-2 support?
The AD7892AR-2 supports a unipolar analog input range of 0 V to +2.5 V on VIN1, with VIN2 grounded. This range is fixed for the -2 variant and differs from the ±10 V (AD7892-1) or ±2.5 V (AD7892-3) options. Input overvoltage protection is not provided for the AD7892AR-2-exceeding 0 V to +2.5 V may damage the device.
Does the AD7892AR-2 require an external reference voltage?
No, the AD7892AR-2 includes an internal +2.5 V reference accessible at the REF OUT/REF IN pin. When using this internal reference, a 0.1 µF ceramic capacitor must be placed between REF OUT/REF IN and AGND. An external +2.5 V reference can be applied to the same pin to override the internal source, but is not required for basic operation of the AD7892AR-2.
How is the interface mode selected on the AD7892AR-2?
The interface mode of the AD7892AR-2 is controlled by the MODE pin: logic high selects parallel mode (enabling DB0–DB11 outputs), and logic low selects serial mode (activating RFS, SCLK, and SDATA functions). This configuration is latched at power-up and remains static during operation-no runtime reconfiguration is supported in the AD7892AR-2.
What is the power consumption of the AD7892AR-2 in standby mode?
In standby mode, the AD7892AR-2 draws 250 µA typical (100 µA max) from the +5 V supply, reducing power dissipation to approximately 1.25 mW. This low-current state is entered by driving the STANDBY pin low and is designed for rapid wake-up-conversion must not be initiated within 30 µs of exiting standby to ensure specification compliance.
Which package type is used for the AD7892AR-2?
The AD7892AR-2 is supplied in a 24-lead small outline integrated circuit (SOIC) package designated R-24, with standard 0.3" body width and 0.050" lead pitch. This surface-mount package supports automated assembly and provides θJA = 75°C/W thermal performance, rated for operation from –40°C to +85°C.
AD7892AR-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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-2 FAQ
1.How can I place an order for AD7892AR-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7892AR-2 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-2 reliable?
The price and inventory of AD7892AR-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7892AR-2 is usually 5 days.
3.What payment methods are accepted for AD7892AR-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7892AR-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7892AR-2?
AD7892AR-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7892AR-2 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-2?
For technical support, including AD7892AR-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7892AR-2 requirements.
6.How does Aetrix verify that AD7892AR-2 is sourced from the original manufacturer or authorized distributors?
All AD7892AR-2 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-2 meets industry standards.
7.What is the process for return or replacement of AD7892AR-2?
All AD7892AR-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7892AR-2, 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-2 part is unused and in its original packaging.
Return procedure for AD7892AR-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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