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Analog Devices Inc. AD7892ANZ-1
- Part No.:
- AD7892ANZ-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7892ANZ-1.pdf
- Description:
- IC ADC 12BIT SAR 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,409
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Product details
Overview
AD7892ANZ-1 from Analog Devices is a LC2MOS 12-bit, 500 kSPS analog-to-digital converter operating from a single +5 V supply. It integrates track/hold, internal +2.5 V reference, and dual serial/parallel interfaces. Designed for ±5 V or ±10 V analog input ranges with ±1.5 LSB relative accuracy and 70 dB SNR, it serves precision data acquisition in industrial instrumentation and automated test equipment.
For engineers reviewing the AD7892ANZ-1 datasheet, AD7892ANZ-1 pinout, AD7892ANZ-1 application, or AD7892ANZ-1 equivalent, key selection considerations include its 500 kSPS throughput, bipolar input range flexibility, low-power standby mode (80 µA), and compatibility with microcontrollers via MODE-selectable serial (RFS/SCLK/SDATA) or parallel (DB0–DB11) interface.
Technical Context
The AD7892ANZ-1 implements a successive approximation ADC architecture with on-chip track/hold amplifier and internal reference buffer. Its conversion time is 1.6 µs max, and track/hold acquisition time is 400 ns min - enabling stable 500 kSPS operation without external timing control.
Interface behavior is determined by the MODE pin: logic high enables 12-bit parallel output (DB0–DB11) with CS/RD/EOC handshaking; logic low activates three-wire serial mode using DB3/RFS, DB4/SCLK, and DB5/SDATA, delivering 16-bit frames (4 leading zeros + 12-bit two's complement data).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes over full scale, essential for monotonic control loop feedback. |
| Throughput Rate | 500 kSPS - supports real-time sampling of signals up to ~200 kHz bandwidth (Nyquist-limited) in continuous acquisition. |
| Analog Input Range | ±5 V or ±10 V - selectable via VIN2 connection; enables direct interfacing with industrial sensor outputs without external scaling. |
| Relative Accuracy | ±1.5 LSB max - ensures end-point linearity within 0.036% of full scale, critical for calibrated measurement systems. |
| Power Consumption | 60 mW typ at 500 kSPS - enables portable or thermally constrained designs; drops to 75 µW in standby mode. |
| Reference Output | +2.5 V ±10 mV @ 25°C - internally buffered, requires only 0.1 µF AGND decoupling; temperature coefficient 25 ppm/°C. |
| Overvoltage Tolerance | ±17 V on VIN1/VIN2 - protects against transient surges in industrial environments without external clamping diodes. |
Pinout & Package
AD7892ANZ-1 is housed in a 24-lead, 0.3" wide plastic DIP (N-24 package), RoHS-compliant and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive Supply | +5 V ±5% main power rail; supplies analog and digital sections; bypassing to AGND/DGND required. |
| 2 STANDBY | Power Mode Control | Logic high = active mode; logic low = standby (75 µW typical), enabling rapid wake-up (<30 µs delay before next CONVST). |
| 3 VIN2 | Analog Input Configuration | Grounded for ±10 V range at VIN1; tied to VIN1 for ±5 V range; must be AGND for AD7892-2/3 variants. |
| 4 VIN1 | Main Analog Input | Accepts ±5 V or ±10 V differential input; overvoltage protected to ±17 V; high-impedance (8 kΩ min) when VIN2 grounded. |
| 5 REF OUT/REF IN | Reference Interface | Provides +2.5 V internal reference (buffered, 5.5 kΩ output Z); accepts external 2.375–2.625 V reference to override internal source. |
| 6 AGND | Analog Ground | Separate ground return for track/hold, comparator, and DAC; must be star-connected to minimize noise coupling. |
| 7 MODE | Interface Selection | Logic high = parallel mode (DB0–DB11 active); logic low = serial mode (RFS/SCLK/SDATA active). |
| 8 DB11/LOW | Data Bit 11 / Test Pin | MSB in parallel mode; must be tied low in serial mode to ensure correct internal timing and state machine operation. |
| 9 DB10/LOW | Data Bit 10 / Test Pin | Second MSB in parallel mode; must be tied low in serial mode to prevent undefined logic states. |
| 10–13 DB9–DB6 | Data Bits 9–6 | TTL-compatible three-state outputs; high-impedance when not selected (CS/RD inactive or MODE = low). |
| 14 DGND | Digital Ground | Isolated ground for digital I/O; must be connected to AGND at single point near VDD decoupling capacitor. |
| 15 DB5/SDATA | Data Bit 5 / Serial Data Out | LSB in parallel mode; serial data output in MODE = low - delivers 16-bit frame (4 zeros + 12-bit two's complement). |
| 16 DB4/SCLK | Data Bit 4 / Serial Clock In | Input in serial mode; rising edge clocks out SDATA; requires externally generated SCLK with ≥25 ns pulse width. |
| 17 DB3/RFS | Data Bit 3 / Frame Sync In | Active-low frame sync in serial mode; falling edge initiates 16-bit serial transfer; must be held low for full frame duration. |
| 18–20 DB2–DB0 | Data Bits 2–0 | Three-state TTL outputs; DB0 is LSB; all float when MODE = low or CS/RD inactive. |
| 21 RD | Read Strobe | Active-low control; enables DBx outputs when asserted with CS low; defines data access window (t6 ≤ 40 ns max). |
| 22 CS | Chip Select | Active-low enable; combined with RD to gate parallel data; supports multi-device bus sharing with address decoding. |
| 23 EOC | End-of-Conversion Flag | Active-low pulse (~100 ns width) indicates valid data ready; can trigger microcontroller interrupt or auto-RD sequence. |
| 24 CONVST | Convert Start | Rising-edge triggered; initiates hold mode and conversion; aperture delay <15 ns ensures precise sampling timing. |
Key Features
| Feature | Design Value |
|---|---|
| Single +5 V supply operation | Eliminates need for dual-rail or charge-pump supplies - reduces BOM count and layout complexity in battery-powered systems. |
| On-chip track/hold amplifier | Acquires ±10 V full-scale sine wave to 12-bit accuracy in ≤400 ns - enables direct digitization of fast transients without external THS. |
| Dual serial/parallel interface | MODE-pin selectable I/O reduces system-level interface redesign - supports legacy parallel buses or modern low-pin-count serial links. |
| ±17 V analog input overvoltage protection | Withstands industrial field transients without external TVS or series resistors - improves system robustness and reduces failure rate. |
| Internal +2.5 V reference with 25 ppm/°C TC | Enables self-contained calibration-grade measurements without external reference IC - simplifies design and lowers cost. |
| Low-power standby mode (80 µA max) | Reduces average power in duty-cycled DAQ systems - extends battery life in portable meters and sensor nodes. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous voltage/current monitoring of PLC I/O modules and motor drive feedback loops. IC Role / Device Role / Timing Role: Primary ADC capturing ±10 V sensor outputs at 500 kSPS with synchronized CONVST triggering from FPGA timer. Use Value: 12-bit resolution and ±1.5 LSB linearity ensure accurate representation of 4–20 mA loop signals after conditioning, meeting IEC 61000-4-5 surge immunity requirements. |
Use Scenario: High-speed parametric testing of op-amps and comparators using stimulus-response methodology. IC Role / Device Role / Timing Role: Digitizer for output waveform capture; EOC signal triggers pattern generator re-synchronization. Use Value: 400 ns track/hold acquisition time allows clean sampling of fast settling responses; parallel interface enables burst-mode data streaming to FIFO memory. |
| Portable Data Loggers | Power Quality Analyzers |
Use Scenario: Battery-operated environmental sensors logging temperature, pressure, and humidity over extended periods. IC Role / Device Role / Timing Role: Low-power ADC activated periodically via microcontroller GPIO; STANDBY pin manages sleep/wake cycles. Use Value: 75 µW standby power and single 5 V supply reduce energy consumption per sample - extending operational life beyond 12 months on AA cells. |
Use Scenario: Real-time harmonic analysis of 50/60 Hz mains voltage with detection of 2nd–25th harmonics. IC Role / Device Role / Timing Role: Front-end digitizer clocked at 2.56 kSPS (50× fundamental) with precise phase alignment via CONVST edge. Use Value: 70 dB SNR and –78 dB THD support IEEE 519-compliant harmonic distortion measurement up to 1.2 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, medium-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7892BN-1 | Same package and pinout; ±1 LSB relative accuracy (vs. ±1.5 LSB for AD7892ANZ-1); identical timing and interface. | Used where tighter DC linearity is required for calibration-critical systems (e.g., metrology standards). | Select AD7892BN-1 when absolute accuracy dominates over cost; AD7892ANZ-1 suits general-purpose industrial DAQ where ±1.5 LSB meets spec. |
| ADS7822U | 12-bit, 200 kSPS SAR ADC; SPI-only interface; single 2.7–5.25 V supply; no internal reference; requires external REF. | Targeted at space-constrained PCBs needing minimal footprint (8-pin SOIC) and lower power (1.5 mW active), but sacrifices speed and input protection. | Choose ADS7822U for ultra-low-power, low-pin-count designs without overvoltage risk; retain AD7892ANZ-1 for 500 kSPS, ±17 V tolerance, and integrated reference. |
Compared with AD7892BN-1, AD7892ANZ-1 trades 0.5 LSB linearity for broader availability and lower unit cost while maintaining identical timing, packaging, and interface compatibility. Against ADS7822U, AD7892ANZ-1 provides 2.5× higher throughput, built-in ±17 V protection, and self-contained reference - justifying its use in ruggedized, performance-driven systems.
Availability
AD7892ANZ-1 is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and portable data loggers requiring stable component supply across extended production lifecycles.
Supply support for AD7892ANZ-1 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 since 1965.
The AD7892 product line delivers single-supply, medium-speed SAR ADCs optimized for precision data acquisition in electrically noisy, thermally variable environments - emphasizing robustness, ease of interface, and guaranteed monotonicity.
FAQ
What input voltage ranges does the AD7892ANZ-1 support?
The AD7892ANZ-1 supports ±5 V or ±10 V analog input ranges on VIN1, selected by connecting VIN2 to AGND (±10 V) or to VIN1 (±5 V). This configuration is fixed at board level and cannot be changed dynamically during operation. The part does not support unipolar 0–2.5 V input - that range applies only to AD7892-2 variants. All specifications assume proper decoupling and grounding per the datasheet layout guidelines.
How does the MODE pin affect AD7892ANZ-1 interface operation?
The MODE pin determines whether AD7892ANZ-1 operates in parallel or serial mode: logic high enables 12-bit parallel output on DB0–DB11 with CS/RD/EOC handshaking; logic low activates three-wire serial mode using DB3/RFS (frame sync), DB4/SCLK (clock), and DB5/SDATA (data out). Pins DB8–DB11 become no-connect in serial mode and must be left floating or pulled low per pin function description - incorrect biasing causes undefined behavior.
Can the AD7892ANZ-1 use an external reference, and what are the requirements?
Yes, AD7892ANZ-1 accepts an external reference applied to the REF OUT/REF IN pin. The external source must provide 2.375 V to 2.625 V (±5% of 2.5 V), deliver ±100 µA, and exhibit low noise (<10 µV RMS) to avoid degrading SNR. Common compatible references include AD780 (2.5 V, 20 ppm/°C) and REF43 (2.5 V, 3 ppm/°C). When using external reference, the internal +2.5 V source is disabled, and the REF OUT/REF IN pin functions solely as input.
What is the minimum time between conversions for reliable AD7892ANZ-1 operation?
After EOC falls (end of conversion), AD7892ANZ-1 requires a minimum track/hold acquisition time of 400 ns before the next CONVST rising edge. Additionally, if exiting standby mode, a 30 µs delay must elapse before issuing CONVST. Violating either interval risks incomplete settling and non-monotonic output. These timing constraints are independent of interface mode and apply identically in parallel and serial configurations.
Does AD7892ANZ-1 support daisy-chained serial communication?
No, AD7892ANZ-1 does not support daisy-chaining. Its serial interface is strictly point-to-point: one RFS, one SCLK, and one SDATA line per device. Multiple AD7892ANZ-1 units require individual RFS/SCLK lines or multiplexed control with separate chip select logic. The serial protocol delivers only 16-bit frames (4 leading zeros + 12-bit two's complement) with no framing bits, CRC, or addressing - making shared-bus arbitration impractical.
AD7892ANZ-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7892ANZ-1 FAQ
1.How can I place an order for AD7892ANZ-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7892ANZ-1 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 AD7892ANZ-1 reliable?
The price and inventory of AD7892ANZ-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7892ANZ-1 is usually 5 days.
3.What payment methods are accepted for AD7892ANZ-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7892ANZ-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7892ANZ-1?
AD7892ANZ-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7892ANZ-1 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 AD7892ANZ-1?
For technical support, including AD7892ANZ-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7892ANZ-1 requirements.
6.How does Aetrix verify that AD7892ANZ-1 is sourced from the original manufacturer or authorized distributors?
All AD7892ANZ-1 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 AD7892ANZ-1 meets industry standards.
7.What is the process for return or replacement of AD7892ANZ-1?
All AD7892ANZ-1 units undergo pre-shipment inspection (PSI). If there is an issue with AD7892ANZ-1, 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 AD7892ANZ-1 part is unused and in its original packaging.
Return procedure for AD7892ANZ-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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