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Analog Devices Inc. AD7892BR-2REEL7
- Part No.:
- AD7892BR-2REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7892BR-2REEL7.pdf
- Description:
- IC ADC 12BIT LP 500KSPS 24-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:11,354
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Product details
Overview
AD7892BR-2REEL7 from Analog Devices is a 12-bit, single-supply SAR analog-to-digital converter with 500 kSPS throughput, ±1 LSB relative accuracy, 0 V to +2.5 V unipolar input range, and dual parallel/serial interface capability. It integrates on-chip track/hold, internal +2.5 V reference, and operates at 60 mW typical power from +5 V.
For engineers reviewing the AD7892BR-2REEL7 datasheet, AD7892BR-2REEL7 pinout, AD7892BR-2REEL7 application, or AD7892BR-2REEL7 equivalent, key selection criteria include unipolar input compliance, SOIC-24 packaging, standby-mode current (250 µA typ), serial/parallel interface flexibility, and compatibility with microcontroller serial ports or 8-/16-bit parallel buses.
Technical Context
The AD7892BR-2REEL7 implements a successive approximation register (SAR) ADC architecture with integrated track/hold amplifier optimized for 500 kSPS operation. Its signal scaling supports only 0 V to +2.5 V input on VIN1 referenced to VIN2 (AGND), with no bipolar or ±10 V capability.
Interface mode is selected via the MODE pin: logic high enables 12-bit parallel output (DB0–DB11), logic low enables three-wire serial output (RFS/SCLK/SDATA). Conversion is initiated by rising edge on CONVST; EOC asserts low for ≥60 ns upon completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees monotonic output and no missing codes over full 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 on VIN1 - requires VIN2 tied to AGND; not configurable for bipolar ranges. |
| Relative Accuracy | ±1 LSB max - ensures end-point linearity error ≤ ±0.024% of full-scale (2.5 V). |
| Power Consumption | 60 mW typ at +5 V - includes active-mode IDD = 18 mA; standby current = 250 µA typ. |
| Reference Source | Internal +2.5 V ±10 mV @ +25°C - buffered output at REF OUT/REF IN; tempco = 25 ppm/°C. |
| Digital Output Coding | Straight (natural) binary - LSB-aligned, non-two's-complement format for unipolar input. |
Pinout & Package
AD7892BR-2REEL7 is housed in a 24-lead SOIC (R-24) package with standard 0.3" width and gull-wing leads. Thermal impedance θJA = 75°C/W; rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply | +5 V ±5% input; powers analog and digital sections; decoupling required near pin. |
| STANDBY (Pin 2) | Power control | Logic high = active mode; logic low = standby (250 µA typ); 30 µs wake-up delay before next CONVST. |
| VIN2 (Pin 3) | Analog reference node | Must be connected to AGND for AD7892BR-2; floating or external bias invalidates 0–2.5 V specification. |
| VIN1 (Pin 4) | Main analog input | Accepts 0 V to +2.5 V differential vs. VIN2; input resistance = 8 kΩ min; overvoltage limit = –0.3 V to VDD. |
| REF OUT/REF IN (Pin 5) | Reference I/O | Provides internal +2.5 V reference (5.5 kΩ source impedance); accepts external 2.375–2.625 V reference. |
| AGND (Pin 6) | Analog ground | Separate return for track/hold, DAC, and comparator; 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). |
| DB0–DB11 (Pins 8–20, 22) | Data outputs | Three-state TTL-compatible; DB0 = LSB, DB11 = MSB in parallel mode; tri-stated in serial mode except DB5/SDATA. |
| RD (Pin 21) | Read strobe | Active-low; sampled with CS to enable data bus; t6 = 35 ns data access time after RD falling edge. |
| CS (Pin 22) | Chip select | Active-low; used with RD to gate output drivers; t4 = 0 ns CS-to-RD setup required in parallel mode. |
| EOC (Pin 23) | Conversion status | Active-low pulse (≥60 ns wide) signals valid data ready; can drive MCU interrupt directly. |
| CONVST (Pin 24) | Start trigger | Rising-edge initiates conversion and forces track/hold into hold mode; aperture delay = 15 ns typ. |
Key Features
| Feature | Design Value |
|---|---|
| Single +5 V supply operation | Eliminates need for dual-rail or negative supplies in portable/data-acquisition systems. |
| On-chip track/hold amplifier | Acquires 0–2.5 V step inputs to 12-bit accuracy within 400 ns, enabling DC-coupled sensor interfacing. |
| Dual interface flexibility | Parallel mode supports 8-/16-bit microprocessor buses; serial mode uses only 3 pins for microcontroller SPI-like connection. |
| Low-power standby mode | Reduces IDD to 250 µA typ (75 µW), ideal for battery-powered systems requiring periodic sampling. |
| Integrated +2.5 V reference | ±10 mV initial error and 25 ppm/°C drift allow direct use without external precision reference in cost-sensitive designs. |
Applications
| Industrial Process Monitoring | Portable Data Loggers |
|---|---|
Use Scenario: Continuous voltage monitoring of 0–2.5 V sensor outputs (e.g., thermocouple amplifiers, pressure transducers) in PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC digitizing analog field signals; synchronized to system clock via CONVST; EOC triggers DMA transfer. Use Value: ±1 LSB linearity ensures <0.025% full-scale measurement fidelity across –40°C to +85°C industrial temperature range. |
Use Scenario: Battery-operated environmental sensor nodes measuring temperature, humidity, and light intensity with microcontroller host. IC Role / Device Role / Timing Role: Low-power ADC in sleep/wake cycle; STANDBY pin reduces quiescent current to 250 µA between 100-ms sampling intervals. Use Value: 60 mW active power and 75 µW standby power extend AA-cell lifetime to >1 year at 10 SPS duty cycle. |
| Medical Instrumentation Front-End | Test & Measurement Equipment |
Use Scenario: Digitizing conditioned biopotential signals (ECG, EMG) where 0–2.5 V unipolar range matches amplifier output swing. IC Role / Device Role / Timing Role: High-fidelity signal capture stage; MODE pin selects serial interface to conserve MCU GPIOs; RFS/SCLK/SDATA connect directly to UART/SPI peripheral. Use Value: 70 dB SNR at 100 kHz input enables clean acquisition of low-amplitude physiological waveforms without oversampling. |
Use Scenario: Embedded digitizer in benchtop multimeters or oscilloscope auxiliary channels requiring compact, self-contained ADC subsystem. IC Role / Device Role / Timing Role: Standalone ADC with internal reference; parallel interface allows fast burst reads to FPGA buffer; REF OUT provides stable 2.5 V for external circuitry. Use Value: SOIC-24 footprint and 75°C/W thermal impedance support convection-cooled PCB layouts without heatsinks. |
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 specs but in plastic DIP (N-24); higher θJA = 105°C/W; no reel packaging. | Preferred for prototyping or through-hole assembly; less suitable for automated SMT production. | Select AD7892BN-2 only when DIP footprint or hand-soldering is required. |
| ADS7822U | 12-bit, 200 kSPS, SPI-only interface; 2.7–5.25 V supply; no internal reference; requires external 2.5 V ref. | Lower throughput and single-interface constraint limit use in high-speed parallel-bus systems. | Choose ADS7822U when board space is critical and SPI-native microcontroller integration is prioritized over speed. |
Compared with AD7892BN-2 and ADS7822U, AD7892BR-2REEL7 uniquely combines SOIC-24 SMT compatibility, 500 kSPS parallel/serial flexibility, and factory-trimmed internal reference-enabling drop-in deployment in volume-manufactured portable and industrial DAQ systems without layout or firmware redesign.
Availability
AD7892BR-2REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, medical instrumentation front-ends, and test & measurement equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for AD7892BR-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, founded in 1965 and headquartered in Wilmington, MA.
The AD7892BR-2REEL7 belongs to Analog Devices' legacy high-speed precision ADC product line, designed specifically for single-supply, low-power, medium-throughput data acquisition in space-constrained industrial and portable systems.
FAQ
What input voltage range does the AD7892BR-2REEL7 support?
The AD7892BR-2REEL7 supports only a 0 V to +2.5 V unipolar analog input range on VIN1, with VIN2 tied 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 altered via external resistors or configuration pins.
Does the AD7892BR-2REEL7 require an external reference voltage?
No, the AD7892BR-2REEL7 includes a factory-trimmed +2.5 V internal reference accessible at the REF OUT/REF IN pin. A 0.1 µF ceramic capacitor to AGND is required for stability. An external reference (2.375–2.625 V) may be used instead, but is not necessary for standard operation of AD7892BR-2REEL7.
How is the interface mode selected on the AD7892BR-2REEL7?
Interface mode is controlled solely by the MODE pin: logic high (≥2.4 V) selects 12-bit parallel output (DB0–DB11 active), while logic low (≤0.8 V) enables three-wire serial output (RFS/SCLK/SDATA). No register writes or timing sequences are needed-mode selection is hardware-based and immediate.
What is the power consumption of the AD7892BR-2REEL7 in standby mode?
In standby mode (STANDBY = logic low), the AD7892BR-2REEL7 draws 250 µA typical current at +5 V, equating to ~1.25 mW power dissipation. A minimum 30 µs delay is required after exiting standby before issuing the next CONVST pulse to ensure internal circuits stabilize.
Is the AD7892BR-2REEL7 pin-compatible with other AD7892 variants?
Yes, all AD7892 variants-including AD7892BR-2REEL7, AD7892BR-1, and AD7892BR-3-share identical SOIC-24 pinouts and electrical interface behavior. However, input range, conversion time, and output coding differ: AD7892BR-2REEL7 uses straight binary and 0–2.5 V input, while others use two's complement and bipolar ranges.
AD7892BR-2REEL7 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-2REEL7 FAQ
1.How can I place an order for AD7892BR-2REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7892BR-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 AD7892BR-2REEL7 reliable?
The price and inventory of AD7892BR-2REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7892BR-2REEL7 is usually 5 days.
3.What payment methods are accepted for AD7892BR-2REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7892BR-2REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7892BR-2REEL7?
AD7892BR-2REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7892BR-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 AD7892BR-2REEL7?
For technical support, including AD7892BR-2REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7892BR-2REEL7 requirements.
6.How does Aetrix verify that AD7892BR-2REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7892BR-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 AD7892BR-2REEL7 meets industry standards.
7.What is the process for return or replacement of AD7892BR-2REEL7?
All AD7892BR-2REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7892BR-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 AD7892BR-2REEL7 part is unused and in its original packaging.
Return procedure for AD7892BR-2REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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