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Analog Devices Inc. AD7892BRZ-2
- Part No.:
- AD7892BRZ-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7892BRZ-2.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,057
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Product details
Overview
AD7892BRZ-2 from Analog Devices is a 12-bit, single-supply successive approximation ADC with 500 kSPS throughput, ±1 LSB relative accuracy, and dual serial/parallel interface support. It operates from +5 V, consumes 60 mW typical, and accepts 0 V to +2.5 V unipolar analog input on VIN1 with VIN2 grounded - optimized for precision data acquisition in portable instrumentation and industrial sensor interfaces.
For engineers reviewing the AD7892BRZ-2 datasheet, AD7892BRZ-2 pinout, AD7892BRZ-2 application, or AD7892BRZ-2 equivalent, key selection considerations include its SOIC-24 package, straight binary output coding, 400 ns track/hold acquisition time, standby current of 250 µA, and compatibility with microcontrollers via configurable MODE pin.
Technical Context
The AD7892BRZ-2 integrates an on-chip track/hold amplifier, internal +2.5 V reference (±10 mV @ +25°C), and LC2MOS process technology enabling bipolar-compatible operation from a single +5 V supply. Its analog front-end supports 0 V to +2.5 V input range with ±50 mV common-mode tolerance on VIN2 and 8 kΩ minimum input resistance on VIN1.
Interface flexibility is implemented via MODE pin selection: logic high enables 12-bit parallel output (DB0–DB11) with CS/RD control, while logic low activates three-wire serial mode using RFS/SCLK/SDATA pins. Conversion is triggered by rising edge on CONVST; EOC asserts low for ≥60 ns upon completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes over full operating temperature range. |
| Throughput Rate | 500 kSPS - determined by 1.6 µs conversion time and 400 ns track/hold acquisition. |
| Analog Input Range | 0 V to +2.5 V on VIN1 - requires VIN2 tied to AGND; supports unipolar sensor outputs. |
| Output Coding | Straight (natural) binary - simplifies firmware decoding vs. two's complement for unipolar signals. |
| Relative Accuracy | ±1 LSB max - ensures monotonicity and ≤0.024% full-scale linearity error. |
| Power Consumption | 60 mW typical at 500 kSPS - enables battery-powered designs with thermal budget <100 mW. |
| Standby Current | 250 µA typical - reduces power to 1.25 mW during idle periods without reset loss. |
Pinout & Package
AD7892BRZ-2 is housed in a 24-lead SOIC (R-24) package with standard 0.3" width and 0.050" lead pitch. 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% input; powers analog and digital sections; decoupling required near pin. |
| STANDBY (Pin 2) | Power mode control | Logic high = active; logic low = standby (250 µA typ); must wait ≥30 µs before next CONVST. |
| VIN2 (Pin 3) | Analog common-mode reference | Must be connected to AGND for AD7892BRZ-2; floating or external bias invalidates input range spec. |
| VIN1 (Pin 4) | Main analog input | Accepts 0 V to +2.5 V unipolar signal; 10 nA max input current minimizes loading on source. |
| REF OUT/REF IN (Pin 5) | Reference interface | Provides internal +2.5 V ref (±10 mV @ +25°C); external ref overdrives internal node. |
| AGND (Pin 6) | Analog ground reference | Separate from DGND; must be star-connected to minimize noise coupling into track/hold. |
| MODE (Pin 7) | Interface selection | Logic high = parallel mode (DB0–DB11 active); logic low = serial mode (RFS/SCLK/SDATA active). |
| DB0–DB11 (Pins 8–20) | Data outputs | Three-state TTL-compatible; DB0 = LSB, DB11 = MSB in parallel mode; tri-stated in serial mode. |
| DGND (Pin 14) | Digital ground reference | Return path for digital I/O; isolated from AGND to prevent digital switching noise injection. |
| RD (Pin 21) | Read strobe | Active-low; latches parallel data when asserted with CS low; timing critical for bus access (t6 ≤ 45 ns). |
| CS (Pin 22) | Chip select | Active-low enable for data outputs; used with RD to gate DB0–DB11 in parallel mode. |
| EOC (Pin 23) | Conversion status | Active-low pulse (≥60 ns) signals valid data ready; can drive MCU interrupt directly. |
| CONVST (Pin 24) | Conversion trigger | Rising-edge initiates hold and conversion; aperture delay ≤15 ns ensures precise sampling instant. |
Key Features
| Feature | Design Value |
|---|---|
| Single +5 V supply operation | Eliminates need for dual-rail supplies in mixed-signal systems, reducing BOM count and layout complexity. |
| On-chip track/hold amplifier | Acquires 0 V to +2.5 V inputs to 12-bit accuracy in ≤400 ns, enabling accurate sampling of fast transients. |
| Dual serial/parallel interface | MODE-pin selectable I/O reduces design lock-in: parallel for speed, serial for pin-constrained MCUs. |
| Internal +2.5 V reference | ±10 mV initial error and 25 ppm/°C TC allow direct use in moderate-accuracy applications without external ref. |
| Unipolar input optimization | 0 V to +2.5 V range with straight binary coding matches output of most voltage-output sensors and DACs. |
Applications
| Portable Data Loggers | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Battery-powered environmental monitors acquiring temperature, humidity, and pressure sensor outputs at 100–500 Hz. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs; CONVST synchronized to sensor excitation cycle. Use Value: 250 µA standby current extends battery life; 0 V to +2.5 V input range matches typical sensor output spans without level-shifting. |
Use Scenario: PLC analog input modules converting 4–20 mA loop signals via precision shunt resistors. IC Role / Device Role / Timing Role: High-accuracy front-end ADC with AGND/DGND separation minimizing noise coupling in noisy factory environments. Use Value: ±1 LSB relative accuracy ensures <0.025% reading fidelity; SOIC-24 package supports automated assembly and thermal management. |
| Medical Instrumentation Front-End | Test & Measurement Equipment |
Use Scenario: Portable ECG or pulse oximeter units digitizing low-amplitude biopotential signals after amplification and filtering. IC Role / Device Role / Timing Role: Precision ADC capturing amplified analog waveforms; EOC triggers DMA transfer to reduce CPU overhead. Use Value: 70 dB SNR at 100 kHz input supports clean acquisition of physiological signals; straight binary simplifies real-time waveform reconstruction. |
Use Scenario: Benchtop multimeters and oscilloscope auxiliary channels requiring stable, repeatable DC and low-frequency AC measurements. IC Role / Device Role / Timing Role: Calibration-grade ADC referenced to system master reference; REF IN pin allows traceable external reference integration. Use Value: Internal reference error (±10 mV) contributes <0.4% full-scale gain uncertainty - acceptable for Class II metrology where external ref is optional. |
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 specs but in plastic DIP (N-24); higher θJA (105°C/W) vs. SOIC (75°C/W); no hermetic seal. | Preferred for prototyping or through-hole assembly; less suitable for high-density PCBs or thermal-limited enclosures. | Select AD7892BN-2 only if DIP footprint or manual soldering is required; AD7892BRZ-2 offers superior thermal performance and surface-mount compatibility. |
| ADS7822U | 12-bit, 200 kSPS, SPI-only interface, 2.7–5.25 V supply; no internal reference; 1.25 mW active power. | Battery-critical ultra-low-power apps where throughput <500 kSPS is acceptable and external ref is available. | Choose ADS7822U only when SPI-native interface and sub-2 mW active power outweigh need for parallel option and integrated reference. |
Compared with AD7892BN-2 and ADS7822U, the AD7892BRZ-2 uniquely balances SOIC thermal efficiency, dual-interface flexibility, and integrated reference - making it optimal for production-ready industrial and portable systems requiring 500 kSPS with minimal external components.
Availability
AD7892BRZ-2 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and medical device front-ends requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AD7892BRZ-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 AD7892BRZ-2 belongs to Analog Devices' precision SAR ADC product line, designed specifically for single-supply, medium-speed data acquisition in space- and power-constrained embedded systems.
FAQ
What is the analog input voltage range supported by the AD7892BRZ-2?
The AD7892BRZ-2 supports a unipolar 0 V to +2.5 V analog input range on VIN1, with VIN2 required to be connected to AGND. This range is fixed for the -2 variant and cannot be reconfigured for ±5 V or ±10 V operation like the -1 version. Input current is limited to 10 nA maximum, ensuring minimal loading on signal sources.
Does the AD7892BRZ-2 include an internal voltage reference?
Yes, the AD7892BRZ-2 includes an internal +2.5 V reference accessible via the REF OUT/REF IN pin. Its initial accuracy is ±10 mV at +25°C, with a typical temperature coefficient of 25 ppm/°C and a maximum error of ±25 mV over –40°C to +85°C. A 0.1 µF ceramic capacitor to AGND is required for stability when using the internal reference.
How does the MODE pin affect the interface behavior of the AD7892BRZ-2?
The MODE pin selects between parallel and serial operation: logic high enables 12-bit parallel output on DB0–DB11 with CS/RD handshaking; logic low configures RFS/SCLK/SDATA pins for three-wire serial communication. In serial mode, DB8–DB11 and DB3–DB7 become inactive, and DB11/LOW and DB10/LOW must be tied low for correct operation.
What is the conversion time and throughput rate of the AD7892BRZ-2?
The AD7892BRZ-2 has a maximum conversion time of 1.6 µs and a track/hold acquisition time of 400 ns, resulting in a guaranteed throughput rate of 500 kSPS. This is lower than the AD7892-3 variant (600 kSPS) due to its slower acquisition, but sufficient for most sensor and control-loop sampling requirements.
Is the AD7892BRZ-2 compatible with 3.3 V logic systems?
The AD7892BRZ-2 is specified for +5 V supply only and uses TTL-compatible logic thresholds (VIH ≥ 2.4 V, VIL ≤ 0.8 V). While its digital outputs swing rail-to-rail (0 V to +5 V), interfacing with 3.3 V MCUs requires level translation on inputs (CS, RD, CONVST, MODE) and outputs (DB0–DB11) to avoid overvoltage damage or unreliable logic states.
AD7892BRZ-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 2.5V
- Voltage - Supply, Digital:
- 2.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7892BRZ-2 FAQ
1.How can I place an order for AD7892BRZ-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7892BRZ-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 AD7892BRZ-2 reliable?
The price and inventory of AD7892BRZ-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7892BRZ-2 is usually 5 days.
3.What payment methods are accepted for AD7892BRZ-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7892BRZ-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7892BRZ-2?
AD7892BRZ-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7892BRZ-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 AD7892BRZ-2?
For technical support, including AD7892BRZ-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7892BRZ-2 requirements.
6.How does Aetrix verify that AD7892BRZ-2 is sourced from the original manufacturer or authorized distributors?
All AD7892BRZ-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 AD7892BRZ-2 meets industry standards.
7.What is the process for return or replacement of AD7892BRZ-2?
All AD7892BRZ-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7892BRZ-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 AD7892BRZ-2 part is unused and in its original packaging.
Return procedure for AD7892BRZ-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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