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Analog Devices Inc. AD7892BN-3
- Part No.:
- AD7892BN-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7892BN-3.pdf
- Description:
- IC ADC 12BIT LP 600KSPS 24-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,531
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Product details
Overview
AD7892BN-3 from Analog Devices is a 12-bit, single-supply successive approximation ADC with ±2.5 V analog input range, 600 kSPS throughput rate, 1.47 µs conversion time, and integrated track/hold amplifier - used in high-speed data acquisition systems for industrial process monitoring and sensor signal digitization.
For engineers reviewing the AD7892BN-3 datasheet, AD7892BN-3 pinout, AD7892BN-3 application, or AD7892BN-3 equivalent, key selection criteria include bipolar ±2.5 V input scaling, LC2MOS process low-power operation (60 mW typ), dual serial/parallel interface support, and ±1 LSB relative accuracy over –40°C to +85°C.
Technical Context
The AD7892BN-3 implements a 12-bit SAR architecture with on-chip track/hold amplifier and internal +2.5 V reference. Its 200 ns track/hold acquisition time enables full 600 kSPS sustained throughput without missing codes.
It supports two interface modes via MODE pin: parallel 12-bit output (DB0–DB11) or three-wire serial (RFS/SCLK/SDATA), with two's complement coding for bipolar data. Input overvoltage protection allows ±7 V transient tolerance on VIN1 without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees no missing codes across full operating range |
| Throughput Rate | 600 kSPS - maximum sustained sampling rate with full DC and dynamic specification compliance |
| Conversion Time | 1.47 µs - fixed duration from CONVST rising edge to EOC assertion |
| Analog Input Range | ±2.5 V - differential input range referenced to AGND, supporting bipolar sensor signals |
| Relative Accuracy | ±1 LSB max - ensures monotonicity and end-point linearity within 1 least-significant bit |
| Power Dissipation | 60 mW typical at +5 V - enables portable and thermally constrained embedded designs |
| Reference Output | +2.5 V ±10 mV @ +25°C - buffered internal reference with 25 ppm/°C tempco, decoupled via 0.1 µF to AGND |
Pinout & Package
AD7892BN-3 is housed in a 24-lead, 0.3" wide plastic DIP (N-24 package). Pin functions are electrically validated per Analog Devices' official pin description table and functional block diagram.
| 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 mode control | Logic high = active; logic low = standby (75 µW typical power) |
| VIN2 (Pin 3) | Analog input reference | Must be connected to AGND for AD7892BN-3; left unconnected if not grounded |
| VIN1 (Pin 4) | Main analog input | Accepts ±2.5 V differential signal; protected to ±7 V absolute max |
| REF OUT/REF IN (Pin 5) | Reference interface | 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 circuits |
| MODE (Pin 7) | Interface selection | High = parallel mode (DB0–DB11); low = serial mode (RFS/SCLK/SDATA) |
| DB11/LOW (Pin 8) | Data MSB / test pin | In parallel mode: DB11 (TTL-compatible output); in serial mode: must tie low |
| DB10/LOW (Pin 9) | Data bit / test pin | In parallel mode: DB10; in serial mode: must tie low |
| DB0 (Pin 20) | Data LSB | Two's complement output; valid only in parallel mode; three-state when RD/CS inactive |
| RD (Pin 21) | Read strobe | Active-low control enabling data bus output; requires t4 setup before CS |
| CS (Pin 22) | Chip select | Active-low enable for parallel data access; used with RD to gate DB0–DB11 |
| EOC (Pin 23) | End-of-conversion flag | Active-low pulse (~100 ns width) signaling valid data ready in output register |
| CONVST (Pin 24) | Conversion trigger | Rising-edge initiates track→hold transition and starts SAR conversion sequence |
Key Features
| Feature | Design Value |
|---|---|
| LC2MOS fabrication process | Combines precision bipolar analog front-end with low-power CMOS logic for stability and efficiency |
| Dual interface flexibility | Selectable parallel (12-bit bus) or three-wire serial (RFS/SCLK/SDATA) via MODE pin |
| Bipolar input scaling | ±2.5 V range optimized for differential transducer outputs and industrial current-loop interfaces |
| Integrated track/hold amplifier | 200 ns acquisition time ensures accurate sampling of fast-changing ±2.5 V signals up to 300 kHz |
| Overvoltage protection | Withstands ±7 V on VIN1 without latch-up or parametric shift - critical for noisy factory environments |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Real-time capture of ±2.5 V output from strain-gauge bridges and RTD signal conditioners in PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC performing synchronized 600 kSPS sampling with deterministic 1.47 µs conversion latency. Use Value: Enables sub-1 µs control loop response in closed-loop servo drives using direct sensor feedback digitization. | Use Scenario: High-fidelity waveform digitization in benchtop multimeters and parametric analyzers requiring 12-bit resolution and low THD. IC Role / Device Role / Timing Role: Front-end digitizer interfaced via parallel bus to FPGA-based acquisition controller with EOC-triggered DMA. Use Value: Delivers 70 dB SNR and –78 dB THD at 100 kHz input - meets Class I accuracy requirements for calibration-grade instruments. |
| Motor Drive Current Sensing | Medical Instrumentation |
Use Scenario: Isolated shunt-based phase current measurement in 3-phase inverters, where ±2.5 V represents ±50 A full-scale range. IC Role / Device Role / Timing Role: Bipolar ADC capturing fast current transients during PWM switching edges with minimal aperture jitter. Use Value: 15 ns aperture delay and 200 ns acquisition time ensure <0.1% gain error in 20 kHz PWM current reconstruction. | Use Scenario: Digitizing ±2.5 V EEG/ECG amplifier outputs in portable patient monitors with battery life constraints. IC Role / Device Role / Timing Role: Low-power 12-bit converter operating from +5 V supply with standby mode reducing idle consumption to 75 µW. Use Value: 60 mW typical active power and 80 µA standby current extend battery runtime while maintaining clinical-grade linearity (±1 LSB). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7892BR-3 | Same electrical specs, but in SOIC-24 (R-24) package - 75°C/W θJA vs. 105°C/W for DIP | Preferred for space-constrained PCBs; requires reflow-compatible layout and thermal pad design | Select AD7892BR-3 when board area or thermal management favors surface-mount over through-hole |
| ADS8320U | 16-bit, 100 kSPS, SPI-only interface, ±2.5 V input, 2.7–5.5 V supply - higher resolution but lower speed and no parallel option | Suitable for precision DC measurements (e.g., weigh scales), not high-throughput AC signal capture | Choose ADS8320U only when resolution >12-bit and SPI compatibility outweigh need for 600 kSPS or parallel bus integration |
Compared with AD7892BR-3, AD7892BN-3 offers identical performance in a through-hole DIP package ideal for prototyping and ruggedized industrial assemblies; versus ADS8320U, AD7892BN-3 delivers 6× higher throughput and dual-interface flexibility at the cost of 4-bit resolution - making it optimal for real-time control loops rather than static precision measurement.
Availability
AD7892BN-3 is available at Aetrix Electronics and suitable for industrial process monitoring, motor drive current sensing, automated test equipment, and portable medical instrumentation requiring stable component supply across extended temperature ranges.
Supply support for AD7892BN-3 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, headquartered in Norwood, MA.
The AD7892 product line delivers high-speed, low-power, single-supply 12-bit ADCs with integrated track/hold and flexible serial/parallel interfaces - designed specifically for real-time data acquisition in industrial automation, test & measurement, and embedded control systems.
FAQ
What is the maximum analog input voltage the AD7892BN-3 can tolerate without damage?
The AD7892BN-3 features overvoltage protection on VIN1 rated to ±7 V relative to AGND under absolute maximum conditions. This allows safe operation in electrically noisy industrial environments where transient spikes may exceed the nominal ±2.5 V input range. Operation beyond ±7 V risks permanent damage, and the device must never be subjected to voltages outside this limit even momentarily.
Does the AD7892BN-3 require an external reference, or does it have an internal one?
The AD7892BN-3 includes an internal +2.5 V reference accessible at the REF OUT/REF IN pin, specified as ±10 mV error at +25°C and ±25 mV over –40°C to +85°C. It can operate directly using this reference when decoupled with a 0.1 µF ceramic capacitor to AGND. An external reference (e.g., AD780 or REF43) may be substituted by connecting it to the same pin to override the internal source.
How does the MODE pin affect the AD7892BN-3 interface behavior?
The MODE pin selects between parallel and serial operation: logic high configures DB0–DB11 as active three-state TTL outputs with RD/CS handshaking; logic low disables those pins and activates RFS (Pin 17), SCLK (Pin 16), and SDATA (Pin 15) for three-wire serial communication. Incorrect MODE pin state causes undefined data output and must match the host controller's interface configuration.
What is the significance of the STANDBY pin on the AD7892BN-3, and how should it be used?
The STANDBY pin places the AD7892BN-3 into ultra-low-power mode (75 µW typical) when driven logic low, reducing IDD to 80 µA max. A conversion must not be initiated within 30 µs after exiting standby, as internal circuitry requires stabilization time. For intermittent sampling applications, toggling STANDBY between conversions significantly lowers average power without affecting conversion integrity.
Can the AD7892BN-3 interface directly with a microcontroller lacking dedicated ADC peripherals?
Yes - the AD7892BN-3 supports both parallel and serial interfaces compatible with general-purpose GPIO. In parallel mode, it connects to an 8-/16-bit data bus with RD/CS/EOC handshaking; in serial mode, it uses standard three-wire timing (RFS/SCLK/SDATA) compatible with most MCU SPI peripherals configured for slave-select and custom clock polarity. No special hardware acceleration is required.
AD7892BN-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 600k
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7892BN-3 FAQ
1.How can I place an order for AD7892BN-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7892BN-3 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 AD7892BN-3 reliable?
The price and inventory of AD7892BN-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7892BN-3 is usually 5 days.
3.What payment methods are accepted for AD7892BN-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7892BN-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7892BN-3?
AD7892BN-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7892BN-3 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 AD7892BN-3?
For technical support, including AD7892BN-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7892BN-3 requirements.
6.How does Aetrix verify that AD7892BN-3 is sourced from the original manufacturer or authorized distributors?
All AD7892BN-3 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 AD7892BN-3 meets industry standards.
7.What is the process for return or replacement of AD7892BN-3?
All AD7892BN-3 units undergo pre-shipment inspection (PSI). If there is an issue with AD7892BN-3, 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 AD7892BN-3 part is unused and in its original packaging.
Return procedure for AD7892BN-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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