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Analog Devices Inc. AD7892ARZ-2
- Part No.:
- AD7892ARZ-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7892ARZ-2.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,447
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Product details
Overview
AD7892ARZ-2 from Analog Devices is a 12-bit, single-supply successive approximation ADC with 500 kSPS throughput, ±1 LSB relative accuracy, 0 V to +2.5 V unipolar input range, and integrated track/hold amplifier - used in portable data acquisition systems requiring low-power, high-speed digitization of sensor or signal-conditioned outputs.
For engineers reviewing the AD7892ARZ-2 datasheet, AD7892ARZ-2 pinout, AD7892ARZ-2 application, or AD7892ARZ-2 equivalent, key selection criteria include unipolar input compliance, serial/parallel interface flexibility, standby current (250 µA typ), internal +2.5 V reference tolerance (±10 mV @ +25°C), and SOIC-24 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The AD7892ARZ-2 implements a 1.6 µs conversion time with 400 ns track/hold acquisition, enabling precise sampling of fast-changing analog signals up to 500 kSPS while maintaining 12-bit resolution and ±1 LSB relative accuracy. Its LC2MOS process integrates bipolar precision circuitry with CMOS logic for low power (60 mW typ) and robust noise immunity.
It supports dual interface modes via MODE pin: parallel 12-bit output (DB0–DB11) or three-wire serial (RFS/SCLK/SDATA), with straight binary coding and unipolar offset error ≤ ±4 LSB. The on-chip +2.5 V reference is buffered and accessible at REF OUT/REF IN, with 5.5 kΩ output impedance and 25 ppm/°C tempco.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees no missing codes over full operating range |
| Throughput Rate | 500 kSPS - enables real-time capture of signals up to ~200 kHz Nyquist bandwidth |
| Analog Input Range | 0 V to +2.5 V (VIN1 referenced to VIN2) - optimized for unipolar sensor outputs and DAC feedback loops |
| Relative Accuracy | ±1 LSB max - ensures monotonicity and linearity critical for closed-loop control |
| Power Consumption | 60 mW typical at +5 V - supports battery-powered instrumentation without thermal derating |
| Standby Current | 250 µA typical - reduces system power during idle intervals without losing configuration |
| Reference Output | +2.5 V ±10 mV @ +25°C - provides stable gain reference; tempco 25 ppm/°C limits drift to ±0.3 mV over –40°C to +85°C |
Pinout & Package
AD7892ARZ-2 is housed in a 24-lead SOIC (R-24) package with standard 0.3" body width and 0.050" lead pitch. Pin 14 is DGND; pin 6 is AGND - separate analog/digital ground planes required for optimal SNR.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 (Pin 4) | Analog input | Accepts 0 V to +2.5 V unipolar signal; must be referenced to VIN2 (AGND) |
| VIN2 (Pin 3) | Analog reference node | Connected to AGND for AD7892ARZ-2; floating prohibited |
| REF OUT/REF IN (Pin 5) | Reference I/O | Provides +2.5 V internal reference; decoupled with 0.1 µF ceramic to AGND |
| MODE (Pin 7) | Interface select | High = parallel mode (DB0–DB11 active); low = serial mode (RFS/SCLK/SDATA active) |
| CONVST (Pin 24) | Conversion trigger | Rising edge initiates track-to-hold transition and starts 1.6 µs conversion sequence |
| EOC (Pin 23) | Status indicator | Active-low pulse (~100 ns wide) signals completion of conversion and data validity |
| RD/CS (Pins 21/22) | Parallel read control | Both low enable three-state DB0–DB11 outputs; timing requires t9 ≥ 200 ns setup before next CONVST |
| DB0–DB11 (Pins 8–20) | Data bus | 12-bit straight binary output; DB0 = LSB, DB11 = MSB; high-impedance when RD/CS inactive |
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 |
| Integrated track/hold amplifier | Acquires 0 V to +2.5 V inputs to 12-bit accuracy in ≤400 ns - avoids external THA design and calibration |
| Dual serial/parallel interface | Reduces microcontroller resource usage: parallel for speed-critical host CPUs; serial (3-wire) for low-pin-count MCUs |
| On-chip +2.5 V reference | Stabilizes gain across temperature (25 ppm/°C) and eliminates external reference IC cost and board space |
| Unipolar offset error ≤ ±4 LSB | Ensures accurate zero-point alignment in sensor front-ends without trimming circuitry |
Applications
| Industrial Sensor Interface | Portable Data Logger |
|---|---|
Use Scenario: Digitizing 4–20 mA loop outputs converted to 0–2.5 V via precision shunt resistor in PLC analog input modules. IC Role / Device Role / Timing Role: ADC core with integrated track/hold and reference - performs synchronized sampling at 500 kSPS under RTOS scheduling. Use Value: Eliminates external reference and THA, reducing component count by 3–4 parts while maintaining ±1 LSB linearity over –40°C to +85°C. | Use Scenario: Battery-powered environmental monitor capturing thermistor, humidity, and pressure sensor outputs at 100 Hz–1 kHz rates. IC Role / Device Role / Timing Role: Low-power ADC subsystem - enters standby (250 µA) between samples, awakened by timer interrupt to execute 1.6 µs conversion. Use Value: Achieves >1-year battery life on two AA cells due to 60 mW active and sub-mW standby power, with no loss of 12-bit fidelity. |
| Medical Instrument Front-End | Motor Control Feedback Loop |
Use Scenario: Sampling ECG amplifier outputs in handheld diagnostic devices where size and EMI immunity are critical. IC Role / Device Role / Timing Role: Precision digitizer with separate AGND/DGND pins and 70 dB SNR - rejects common-mode noise from switching power supplies. Use Value: Meets IEC 60601-1 leakage current requirements via single-supply operation and internal reference isolation. | Use Scenario: Capturing current-sense amplifier outputs in BLDC motor drives for real-time FOC (field-oriented control). IC Role / Device Role / Timing Role: High-speed acquisition block - triggered synchronously with PWM periods to sample phase currents at commutation points. Use Value: 400 ns acquisition time ensures <0.01% gain error at 20 kHz PWM frequencies, enabling torque ripple <2%. |
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 |
|---|---|---|---|
| ADS7822U | 2.7–5.25 V supply; SPI-only interface; 200 kSPS; no internal reference | Requires external +2.5 V reference and level-shifting for 5 V systems | Preferred for ultra-low-voltage battery systems where 500 kSPS is unnecessary |
| MAX11131ETE+ | 2.7–3.6 V supply; 500 kSPS; internal reference; 10-bit resolution | Lacks 12-bit precision and ±1 LSB linearity guarantee | Suitable only when 10-bit resolution suffices and 3.3 V operation is mandatory |
Compared with ADS7822U and MAX11131ETE+, the AD7892ARZ-2 uniquely delivers 12-bit accuracy at 500 kSPS with integrated +2.5 V reference and dual-interface flexibility in a 5 V system - making it optimal for industrial and medical designs where precision, supply simplicity, and interface adaptability are jointly critical.
Availability
AD7892ARZ-2 is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable data loggers, medical instrument front-ends, and motor control feedback loops requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7892ARZ-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.
The AD7892 product line delivers high-speed, low-power SAR ADCs with integrated references and flexible interfaces - designed specifically for embedded data acquisition where precision, power efficiency, and ease of microcontroller integration are essential.
FAQ
What input voltage range does the AD7892ARZ-2 support?
The AD7892ARZ-2 supports a unipolar analog input range of 0 V to +2.5 V applied to VIN1 with VIN2 tied to AGND. This range is fixed for the -2 variant and differs from the ±10 V (AD7892-1) or ±2.5 V (AD7892-3) options. Exceeding +2.5 V or applying negative voltage risks damage, as overvoltage protection is not provided for the AD7892ARZ-2.
Does the AD7892ARZ-2 require an external reference?
No, the AD7892ARZ-2 includes an internal +2.5 V reference accessible at the REF OUT/REF IN pin. For optimal performance, this pin must be decoupled to AGND with a 0.1 µF ceramic capacitor. An external reference may be used by connecting it to the same pin, but the internal reference meets all specified accuracy and tempco requirements for the AD7892ARZ-2.
How does the MODE pin affect AD7892ARZ-2 operation?
The MODE pin selects interface mode: logic high enables parallel 12-bit output (DB0–DB11), while logic low enables three-wire serial communication (RFS/SCLK/SDATA). This pin must be hardwired before conversion starts and cannot be changed dynamically during operation. Incorrect MODE state causes invalid data output or bus contention.
What is the power consumption of AD7892ARZ-2 in standby mode?
In standby mode (STANDBY pin low), the AD7892ARZ-2 draws 250 µA typical, reducing power dissipation to ~1.25 mW at +5 V. A minimum 30 µs delay is required after exiting standby before initiating the next conversion to ensure internal circuits stabilize. This feature enables significant energy savings in duty-cycled measurement systems.
Is the AD7892ARZ-2 pin-compatible with other AD7892 variants?
Yes, all AD7892 variants including AD7892ARZ-2 share identical 24-lead SOIC (R-24) pinout and electrical interface behavior. However, input range, conversion time, and output coding differ: AD7892ARZ-2 uses straight binary and 0–2.5 V input, whereas AD7892ARZ-1/-3 use two's complement and bipolar ranges. PCB layout is reusable, but firmware and analog front-end must match the specific variant.
AD7892ARZ-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:
- -
AD7892ARZ-2 FAQ
1.How can I place an order for AD7892ARZ-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7892ARZ-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 AD7892ARZ-2 reliable?
The price and inventory of AD7892ARZ-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7892ARZ-2 is usually 5 days.
3.What payment methods are accepted for AD7892ARZ-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7892ARZ-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7892ARZ-2?
AD7892ARZ-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7892ARZ-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 AD7892ARZ-2?
For technical support, including AD7892ARZ-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7892ARZ-2 requirements.
6.How does Aetrix verify that AD7892ARZ-2 is sourced from the original manufacturer or authorized distributors?
All AD7892ARZ-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 AD7892ARZ-2 meets industry standards.
7.What is the process for return or replacement of AD7892ARZ-2?
All AD7892ARZ-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7892ARZ-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 AD7892ARZ-2 part is unused and in its original packaging.
Return procedure for AD7892ARZ-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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