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Analog Devices Inc. AD7892BR-2
- Part No.:
- AD7892BR-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7892BR-2.pdf
- Description:
- IC ADC 12BIT LP 500KSPS 24-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:31,718
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Product details
Overview
AD7892BR-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, ±1 LSB relative accuracy, and integrated track/hold amplifier and internal +2.5 V reference - used in precision data acquisition systems for industrial sensors and portable instrumentation.
For engineers reviewing the AD7892BR-2 datasheet, AD7892BR-2 pinout, AD7892BR-2 application, or AD7892BR-2 equivalent, this page delivers verified electrical specs, SOIC-24 package mapping, serial/parallel interface behavior, unipolar offset error (±4 LSB max), and real-world timing constraints including 400 ns track/hold acquisition time and 1.6 µs conversion time.
Technical Context
The AD7892BR-2 implements a 12-bit SAR architecture with on-chip track/hold, internal +2.5 V reference, and dual-mode interface logic controlled by the MODE pin. Its analog front-end supports only unipolar 0 V to +2.5 V input on VIN1 referenced to AGND, with VIN2 grounded or floating per specification.
It operates exclusively from a +5 V ±5% supply, draws 18 mA typical in normal mode (60 mW), and enters low-power standby (<250 µA) when STANDBY is pulled low. Conversion is initiated by CONVST rising edge; EOC falling pulse signals completion; parallel output uses DB0–DB11 (straight binary), while serial mode uses RFS/SCLK/SDATA with 16-bit frame (4 leading zeros + 12 data bits).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees monotonic transfer function with no missing codes over full temperature range. |
| Throughput Rate | 500 kSPS - determined by 1.6 µs conversion time + 400 ns track/hold acquisition time; sets maximum sampling frequency in continuous mode. |
| Analog Input Range | 0 V to +2.5 V on VIN1 - unipolar configuration requiring VIN2 tied to AGND; incompatible with bipolar or extended ranges. |
| Reference Source | Internal +2.5 V ±10 mV (25°C), ±25 mV (TMIN–TMAX) - buffered output at REF OUT/REF IN pin; decoupling with 0.1 µF ceramic capacitor required. |
| DC Accuracy | ±1 LSB relative accuracy, ±4 LSB positive full-scale error, ±4 LSB unipolar offset error - defines worst-case code deviation under specified operating conditions. |
| Power Consumption | 60 mW typical at +5 V - enables battery-powered operation; standby mode reduces current to 250 µA typical (1.25 mW). |
| Digital Interface | Parallel (12-bit TTL-compatible DB0–DB11) or 3-wire serial (RFS/SCLK/SDATA) - selected via MODE pin; both modes support microcontroller/DSP interfacing without external logic. |
Pinout & Package
AD7892BR-2 is packaged in a 24-lead SOIC (R-24) with standard 0.3" width and 0.050" lead pitch. Pin numbering follows industry-standard top-view DIP/SOIC layout as shown in the official pin configuration diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive Supply | +5 V ±5% analog/digital supply; requires local 0.1 µF bypass to AGND near pin. |
| 2 STANDBY | Power Control | Active-high logic input; drives device into 250 µA standby mode when low - must wait ≥30 µs before initiating conversion after exit. |
| 3 VIN2 | Analog Reference Node | Must be connected to AGND for AD7892BR-2 operation; floating allowed but not to other potentials. |
| 4 VIN1 | Main Analog Input | Accepts 0 V to +2.5 V unipolar signal; input resistance 8 kΩ min; overvoltage tolerance limited to –0.3 V / VDD. |
| 5 REF OUT/REF IN | Reference I/O | Provides internal +2.5 V reference or accepts external 2.375–2.625 V source; 5.5 kΩ output impedance; requires 0.1 µF AGND decoupling for internal use. |
| 6 AGND | Analog Ground | Separate ground return for track/hold, DAC, comparator; must be star-connected to DGND at single point. |
| 7 MODE | Interface Selector | High = parallel mode (DB0–DB11 active); low = serial mode (RFS/SCLK/SDATA active); determines pin functionality for DB3–DB11. |
| 8 DB11/LOW | Data Bit 11 / Test | In parallel mode: MSB output (TTL); in serial mode: must be tied low - not an I/O. |
| 9 DB10/LOW | Data Bit 10 / Test | In parallel mode: DB10 output (TTL); in serial mode: must be tied low - not an I/O. |
| 10–13 DB9–DB6 | Data Bits 9–6 | Parallel-only outputs; three-state TTL; left unconnected in serial mode. |
| 14 DGND | Digital Ground | Ground return for digital logic and outputs; separate from AGND except at system common point. |
| 15 DB5/SDATA | Data Bit 5 / Serial Data | In parallel mode: DB5 output; in serial mode: 16-bit serial output (4 zeros + 12 data bits, straight binary). |
| 16 DB4/SCLK | Data Bit 4 / Serial Clock | In parallel mode: DB4 output; in serial mode: SCLK input - external clock required for serial readout. |
| 17 DB3/RFS | Data Bit 3 / Frame Sync | In parallel mode: DB3 output; in serial mode: RFS input - initiates 16-bit serial frame on falling edge. |
| 18–20 DB2–DB0 | Data Bits 2–0 | Parallel-only outputs; DB0 is LSB; all three-state TTL; unconnected in serial mode. |
| 21 RD | Read Strobe | Active-low control; together with CS, enables DB0–DB11 outputs; minimum pulsewidth 35 ns (A/B versions). |
| 22 CS | Chip Select | Active-low enable; must be low with RD to access data; setup/hold timing critical for bus interfacing. |
| 23 EOC | End-of-Conversion | Active-low open-drain output; 100 ns nominal pulse width; used to trigger interrupt or latch data. |
| 24 CONVST | Convert Start | Rising-edge triggered; initiates hold mode and conversion; aperture delay ~15 ns; requires 200 ns setup to next RD. |
Key Features
| Feature | Design Value |
|---|---|
| Single +5 V supply operation | Eliminates need for dual-rail supplies in portable or space-constrained systems - simplifies power design and reduces BOM count. |
| Integrated track/hold amplifier | Acquires 0 V to +2.5 V input to 12-bit accuracy in ≤400 ns - enables accurate sampling of fast-changing sensor signals without external components. |
| On-chip +2.5 V reference | ±10 mV initial error and 25 ppm/°C drift - provides stable scaling for unipolar measurements without external reference IC or trimming. |
| Dual serial/parallel interface | MODE-pin selectable - allows same hardware to interface with microcontrollers (serial) or FPGAs/ASICs (parallel), reducing design reuse effort. |
| Unipolar straight-binary coding | 0x000–0xFFF maps directly to 0 V–+2.5 V - eliminates software two's complement conversion overhead in host firmware. |
| Overvoltage-tolerant inputs | VIN1 withstands –0.3 V to VDD - protects against transient coupling or miswiring in industrial environments where 0–2.5 V sensors may float. |
Applications
| Industrial Process Monitoring | Portable Medical Instrumentation |
|---|---|
Use Scenario: Continuous digitization of 4–20 mA loop-powered temperature/pressure transducers conditioned to 0–2.5 V output. IC Role / Device Role / Timing Role: ADC front-end converting analog sensor voltage to 12-bit digital word synchronized to microcontroller polling cycle. Use Value: ±1 LSB relative accuracy ensures <0.025% full-scale measurement fidelity across –40°C to +85°C; 500 kSPS supports oversampling for noise reduction. |
Use Scenario: Battery-powered handheld ECG or pulse oximeter acquiring analog bio-signals amplified to 0–2.5 V range. IC Role / Device Role / Timing Role: Low-power ADC core enabling >24-hour operation via STANDBY mode between samples. Use Value: 60 mW typical power and 250 µA standby current extend battery life; internal reference removes need for external precision voltage source. |
| Automated Test Equipment (ATE) | Programmable Logic Controller (PLC) Input Module |
Use Scenario: High-speed functional testing of analog circuit boards using 0–2.5 V test signals generated by DACs or signal sources. IC Role / Device Role / Timing Role: Precision digitizer capturing waveform snapshots with deterministic 1.6 µs conversion latency. Use Value: Parallel interface enables direct connection to FPGA-based data capture logic; 400 ns track/hold acquisition ensures fidelity up to 250 kHz input bandwidth. |
Use Scenario: Modular PLC analog input card accepting 0–10 V industrial signals scaled to 0–2.5 V via resistor network for AD7892BR-2 input. IC Role / Device Role / Timing Role: Isolated channel ADC providing calibrated digital representation of field sensor data for CPU processing. Use Value: SOIC-24 package supports automated PCB assembly; ±4 LSB unipolar offset error allows one-time factory calibration to meet 0.1% system accuracy targets. |
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 |
|---|---|---|---|
| AD7892BN-2 | Same 0–2.5 V input, 500 kSPS, ±1 LSB accuracy, but in plastic DIP (N-24) instead of SOIC; higher θJA (105°C/W vs. 75°C/W). | Preferred for prototyping or through-hole assembly; less suitable for high-density or thermally constrained PCBs. | Select AD7892BN-2 only when DIP footprint and hand-soldering are required; AD7892BR-2 is superior for volume production and thermal management. |
| ADS7822U | 12-bit, 200 kSPS, SPI interface only, 2.7–5.25 V supply, 0–VREF input (VREF = 2.5 V), ±1 LSB INL - no internal reference, no parallel mode, lower speed. | Targeted at ultra-low-power MCU-based systems with SPI peripherals; lacks EOC, MODE, or STANDBY pins for flexible timing control. | Choose ADS7822U only when board space is extremely limited and SPI-native interface suffices; AD7892BR-2 offers higher throughput, dual-interface flexibility, and integrated reference. |
Compared with AD7892BN-2 and ADS7822U, the AD7892BR-2 uniquely combines SOIC packaging, internal +2.5 V reference, parallel/serial interface selectability, and 500 kSPS throughput - making it optimal for industrial modules requiring robustness, thermal performance, and firmware portability across microcontroller families.
Availability
AD7892BR-2 is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical instrumentation, automated test equipment, and programmable logic controller input modules requiring stable component supply and long-term manufacturability.
Supply support for AD7892BR-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, founded in 1965 and headquartered in Wilmington, MA.
The AD7892 product line delivers single-supply, high-speed 12-bit ADCs optimized for precision data acquisition in space-, power-, and cost-constrained industrial and portable systems - emphasizing integration, reliability, and ease of microcontroller interfacing.
FAQ
What input voltage range does the AD7892BR-2 support?
The AD7892BR-2 supports only a 0 V to +2.5 V unipolar analog input range on VIN1, with VIN2 connected to AGND. It does not support ±10 V, ±5 V, or ±2.5 V ranges - those are exclusive to AD7892-1 and AD7892-3 variants. This range is fixed by internal scaling and cannot be reconfigured.
Does the AD7892BR-2 include an internal voltage reference?
Yes, the AD7892BR-2 includes an internal +2.5 V reference accessible at the REF OUT/REF IN pin. Its initial error is ±10 mV at +25°C and ±25 mV over –40°C to +85°C, with a typical temperature coefficient of 25 ppm/°C. A 0.1 µF ceramic capacitor to AGND is mandatory for stability.
How does the MODE pin affect AD7892BR-2 operation?
The MODE pin selects between parallel and serial interfaces: logic high enables 12-bit parallel output on DB0–DB11 (straight binary), while logic low activates the 3-wire serial interface (RFS/SCLK/SDATA). Pin functions DB3–DB11 change behavior accordingly - e.g., DB11/LOW must be tied low in serial mode.
What is the power consumption of AD7892BR-2 in standby mode?
In standby mode (STANDBY = low), the AD7892BR-2 draws 250 µA typical (1.25 mW at +5 V), reducing total power by >98% versus normal operation (18 mA / 60 mW). A minimum 30 µs delay is required after exiting standby before issuing a CONVST pulse to ensure proper internal reset.
Is the AD7892BR-2 pin-compatible with other AD7892 variants?
No - while all AD7892 variants share the same 24-pin SOIC/DIP pinout and basic signal names, the AD7892BR-2 is electrically distinct due to its unipolar 0–2.5 V input structure and straight-binary coding. Swapping it for AD7892BR-1 or AD7892BR-3 will cause incorrect scaling and code interpretation without hardware and firmware changes.
AD7892BR-2 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):
- 500k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7892BR-2 FAQ
1.How can I place an order for AD7892BR-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7892BR-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 AD7892BR-2 reliable?
The price and inventory of AD7892BR-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7892BR-2 is usually 5 days.
3.What payment methods are accepted for AD7892BR-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7892BR-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7892BR-2?
AD7892BR-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7892BR-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 AD7892BR-2?
For technical support, including AD7892BR-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7892BR-2 requirements.
6.How does Aetrix verify that AD7892BR-2 is sourced from the original manufacturer or authorized distributors?
All AD7892BR-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 AD7892BR-2 meets industry standards.
7.What is the process for return or replacement of AD7892BR-2?
All AD7892BR-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7892BR-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 AD7892BR-2 part is unused and in its original packaging.
Return procedure for AD7892BR-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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