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Analog Devices Inc. AD7892BNZ-2
- Part No.:
- AD7892BNZ-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7892BNZ-2.pdf
- Description:
- IC ADC 12BIT SAR 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,073
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Product details
Overview
AD7892BNZ-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 accepts a unipolar 0 V to +2.5 V analog input on VIN1 (with VIN2 grounded), operates from +5 V ±5%, and consumes 60 mW typical-enabling precision data acquisition in portable instrumentation and industrial sensor interfaces.
For engineers reviewing the AD7892BNZ-2 datasheet, AD7892BNZ-2 pinout, AD7892BNZ-2 application, or AD7892BNZ-2 equivalent, key selection considerations include its unipolar input range, 500 kSPS conversion rate, standby current of 250 µA typ, 12-bit two's complement output coding (AD7892-2 uses straight binary), and compatibility with microcontrollers via 3-wire serial (RFS/SCLK/SDATA) or 12-bit parallel bus.
Technical Context
The AD7892BNZ-2 implements a 1.6 µs conversion time with 400 ns track/hold acquisition, enabling reliable 500 kSPS operation while maintaining ±1 LSB relative accuracy over –40°C to +85°C. Its LC2MOS process integrates a precision bipolar ADC core with low-power CMOS logic, supporting both serial and parallel readout without external timing components.
Interface mode is selected by the MODE pin: high for 12-bit parallel (DB0–DB11), low for 3-wire serial (RFS/SCLK/SDATA). The REF OUT/REF IN pin supports either the internal +2.5 V reference (±10 mV @ +25°C, 25 ppm/°C TC) or an external reference, with buffered input impedance of 1.6 kΩ min and 10 pF max capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees no missing codes across full operating range |
| Throughput Rate | 500 kSPS - maximum sustained sampling rate with full DC and dynamic specs met |
| Analog Input Range | 0 V to +2.5 V on VIN1 - unipolar range optimized for sensor outputs and DAC feedback loops |
| Relative Accuracy | ±1 LSB max - ensures monotonicity and ≤0.024% full-scale linearity error |
| Power Consumption | 60 mW typical at +5 V - 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 |
| Reference Voltage | +2.5 V nominal - internal reference with ±20 mV max error over temperature, decoupled via 0.1 µF to AGND |
Pinout & Package
AD7892BNZ-2 is housed in a 24-lead, 0.3" wide plastic DIP (N-24 package), with through-hole mounting and industry-standard footprint compatible with socketed prototyping and legacy PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply | +5 V ±5% input; powers analog and digital sections; requires local 0.1 µF ceramic bypass to AGND |
| STANDBY (Pin 2) | Power mode control | Logic high = active; logic low = standby (250 µA typ); must wait ≥30 µs before CONVST after exit |
| VIN2 (Pin 3) | Analog reference node | Must be connected to AGND for AD7892BNZ-2; floating or other potentials cause undefined behavior |
| VIN1 (Pin 4) | Main analog input | Accepts 0 V to +2.5 V unipolar signal; input resistance 8 kΩ min; overvoltage protected to –0.3 V / VDD |
| REF OUT/REF IN (Pin 5) | Reference interface | Provides +2.5 V internal reference or accepts external 2.375–2.625 V source; 5.5 kΩ output impedance when sourcing |
| AGND (Pin 6) | Analog ground | Separate ground return for track/hold, comparator, and DAC; must be star-connected to DGND at single point |
| 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; all high-Z in serial mode except DB5/SDATA, DB4/SCLK, DB3/RFS |
| DGND (Pin 14) | Digital ground | Ground reference for MODE, STANDBY, CS, RD, CONVST, EOC; isolated from AGND except at system common point |
| RD (Pin 21) | Read strobe | Active-low; latches valid conversion data onto DB0–DB11 when CS is low; t6 = 35 ns max access time |
| CS (Pin 22) | Chip select | Active-low; enables output drivers with RD; t4 = 0 ns setup required, t8 = 0 ns hold required |
| EOC (Pin 23) | Conversion status | Active-low pulse (~100 ns width) signals end-of-conversion; used for interrupt-driven readout |
| CONVST (Pin 24) | Conversion trigger | Rising-edge initiates track→hold transition and starts conversion; aperture delay ~15 ns |
Key Features
| Feature | Design Value |
|---|---|
| Single +5 V supply operation | Eliminates need for dual-rail supplies or charge pumps in portable and embedded systems |
| On-chip track/hold amplifier | Acquires 0 V to +2.5 V inputs to 12-bit accuracy in ≤400 ns, enabling anti-aliasing without external circuitry |
| Dual serial/parallel interface | Reduces BOM count: 3-wire serial connects directly to MCU UART/SPI peripherals; 12-bit parallel suits FPGA or fast μP buses |
| Internal +2.5 V reference | Stable reference with ±20 mV max error over temperature-sufficient for 12-bit accuracy without external voltage reference IC |
| Low-power standby mode | 250 µA typical current draw extends battery life in intermittent-sampling applications like environmental monitors |
Applications
| Industrial Process Monitoring | Portable Data Loggers |
|---|---|
Use Scenario: Continuous monitoring of 4–20 mA current loop sensors converted to voltage via precision shunt resistor. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog output (0–2.5 V) at 500 kSPS with ±1 LSB linearity to preserve sensor resolution. Use Value: Enables direct interface to PLC analog inputs or microcontroller ADC peripherals without external gain/level-shifting stages. | Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and pressure over extended field deployments. IC Role / Device Role / Timing Role: Low-power ADC performs burst sampling every 100 ms, entering standby between conversions to minimize average current. Use Value: 250 µA standby current and 60 mW active power allow >1-year operation on two AA cells with efficient duty cycling. |
| Medical Instrumentation Front-End | Test & Measurement Equipment |
Use Scenario: Signal conditioning stage in portable ECG or pulse oximeter where analog front-end outputs 0–2.5 V differential signals. IC Role / Device Role / Timing Role: Digitizes amplified biopotential waveforms with 12-bit resolution and 500 kSPS throughput to capture transient features. Use Value: On-chip track/hold and internal reference eliminate external components, reducing board area and calibration complexity. | Use Scenario: Modular benchtop instrument capturing transient signals from transducers or function generator outputs. IC Role / Device Role / Timing Role: ADC serves as flexible digitizer with selectable serial/parallel interface to match host controller architecture. Use Value: Dual interface support allows same hardware design to interface with ARM-based controllers (serial) or FPGA-based high-speed capture (parallel). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, unipolar-input ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7892BR-2 | Same specs but in SOIC-24 package; 75°C/W θJA vs. 105°C/W for DIP; no lead-free exemption noted | Preferred for space-constrained PCBs requiring surface-mount assembly and higher thermal efficiency | Select AD7892BR-2 when automated SMT production and lower thermal resistance are priorities over through-hole serviceability. |
| ADS7822U | 12-bit, 200 kSPS, SPI-only interface, 2.7–5.25 V supply, 1.25 mW active power; no internal reference | Suited for ultra-low-power, SPI-native systems where 500 kSPS is not required and external reference is acceptable | Choose ADS7822U only if system already uses SPI infrastructure and can accommodate external 2.5 V reference and slower sampling. |
Compared with AD7892BNZ-2, AD7892BR-2 offers identical electrical performance in a smaller SOIC package with better thermal dissipation, while ADS7822U trades speed and interface flexibility for lower power and simpler SPI integration-but requires external reference and delivers only 40% of the throughput.
Availability
AD7892BNZ-2 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 traceable sourcing.
Supply support for AD7892BNZ-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 series belongs to Analog Devices' precision data acquisition product line, designed specifically for high-speed, low-power, single-supply 12-bit ADC applications in industrial, medical, and instrumentation systems where interface flexibility and dc accuracy are critical.
FAQ
What input voltage range does the AD7892BNZ-2 support?
The AD7892BNZ-2 supports a unipolar analog input range of 0 V to +2.5 V on VIN1, with VIN2 tied to AGND. This is specific to the "-2" variant; other variants support ±10 V, ±5 V, or ±2.5 V ranges. Exceeding +2.5 V or going below 0 V on VIN1 may damage the part or produce invalid conversions.
Does the AD7892BNZ-2 require an external reference voltage?
No, the AD7892BNZ-2 includes an internal +2.5 V reference accessible at the REF OUT/REF IN pin. For standard operation, connect a 0.1 µF ceramic capacitor from this pin to AGND. An external reference may be used if tighter tolerance or system-level reference synchronization is needed, but it is not required for basic functionality of the AD7892BNZ-2.
How do I configure the AD7892BNZ-2 for serial versus parallel interface mode?
Interface mode is controlled by the MODE pin: tie MODE to VDD (logic high) for 12-bit parallel operation (DB0–DB11 active), or tie MODE to AGND (logic low) for 3-wire serial operation (RFS, SCLK, SDATA active). Pins DB8–DB11 and DB0–DB7 become high-impedance in serial mode; only DB3/RFS, DB4/SCLK, and DB5/SDATA retain function.
What is the power consumption of the AD7892BNZ-2 in standby mode?
The AD7892BNZ-2 draws 250 µA typical (1.25 mW at +5 V) in standby mode when the STANDBY pin is driven low. This is significantly lower than its 18 mA normal operating current (60 mW typical). Note that a conversion must not be initiated within 30 µs after exiting standby mode to ensure proper internal settling.
Is the AD7892BNZ-2 pin-compatible with other AD7892 variants like AD7892BNZ-1 or AD7892BNZ-3?
Yes, all AD7892 variants-including AD7892BNZ-1, AD7892BNZ-2, and AD7892BNZ-3-are pin-compatible in the same N-24 DIP package. However, their input ranges, conversion rates, and output coding differ: AD7892BNZ-2 uses straight binary coding and 0 V to +2.5 V input, while AD7892BNZ-1/-3 use two's complement and bipolar ranges. Swapping variants requires firmware and signal conditioning review.
AD7892BNZ-2 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):
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7892BNZ-2 FAQ
1.How can I place an order for AD7892BNZ-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7892BNZ-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 AD7892BNZ-2 reliable?
The price and inventory of AD7892BNZ-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7892BNZ-2 is usually 5 days.
3.What payment methods are accepted for AD7892BNZ-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7892BNZ-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7892BNZ-2?
AD7892BNZ-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7892BNZ-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 AD7892BNZ-2?
For technical support, including AD7892BNZ-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7892BNZ-2 requirements.
6.How does Aetrix verify that AD7892BNZ-2 is sourced from the original manufacturer or authorized distributors?
All AD7892BNZ-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 AD7892BNZ-2 meets industry standards.
7.What is the process for return or replacement of AD7892BNZ-2?
All AD7892BNZ-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7892BNZ-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 AD7892BNZ-2 part is unused and in its original packaging.
Return procedure for AD7892BNZ-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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