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Analog Devices Inc. AD574AJN
- Part No.:
- AD574AJN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD574AJN.pdf
- Description:
- IC ADC 12BIT SAR 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,217
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Product details
Overview
AD574AJN from Analog Devices is a complete 12-bit monolithic successive-approximation analog-to-digital converter (ADC) with on-chip reference, clock, and tri-state data outputs. It delivers ±1 LSB linearity error over 0°C to +70°C, supports unipolar (0 V to +10 V or 0 V to +20 V) and bipolar (±5 V or ±10 V) input ranges, and achieves ≤35 µs full-scale conversion time. It is used in precision industrial data acquisition systems requiring self-contained, calibrated ADC functionality without external DAC or reference components.
For engineers reviewing the AD574AJN datasheet, AD574AJN pinout, AD574AJN application, or AD574AJN equivalent, this page provides verified technical context, exact pin roles, real-world use cases in sensor signal conditioning and process control, and two confirmed alternative parts with documented functional and calibration differences.
Technical Context
The AD574AJN integrates a 12-bit current-output DAC, temperature-compensated buried Zener reference (10.00 V ±0.2%), comparator, successive-approximation register (SAR), and output buffers - all in a single plastic DIP-28 package. Its internal 5 kΩ/10 kΩ scaling resistors enable direct 10 V or 20 V unipolar spans and ±5 V/±10 V bipolar spans without external gain-setting components.
Control logic supports both 12-bit and 8-bit conversion modes via AO and 12/8 pins, with status flag (STS) and tri-state parallel data outputs (DB11–DB0). It requires three power supplies: +5 V (VLOGIC), +12/+15 V (VCC), and –12/–15 V (VEE), and mandates stable analog/digital ground separation with Pin 9 (ANA COM) as the high-fidelity reference ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete digital codes across full input range |
| Linearity Error (TMIN–TMAX) | ±1 LSB - guarantees monotonicity and ≤1 code deviation from ideal transfer curve over 0°C to +70°C |
| Input Ranges | Unipolar: 0 V to +10 V or 0 V to +20 V; Bipolar: ±5 V or ±10 V - selectable via pin-strapping, no external op amps required |
| Conversion Time | ≤35 µs for 12-bit mode - enables sampling up to ~28.6 kHz with adequate hold-time margin |
| Internal Reference | 10.00 V ±0.2% - trimmed Zener source supplying 1.5 mA max; eliminates need for external precision reference |
| Supply Voltages | VLOGIC = +4.5 V to +5.5 V; VCC = +11.4 V to +16.5 V; VEE = –11.4 V to –16.5 V - supports both ±12 V and ±15 V operation |
| Power Dissipation | 390 mW typical - compatible with standard through-hole PCB thermal design at +70°C ambient |
Pinout & Package
AD574AJN uses a 28-pin plastic dual in-line package (N-28), with 0.6-inch width and standard DIP footprint. Pin 1 is top-left corner (notch side), and pin numbering follows standard DIP convention (counter-clockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (VLOGIC) | Digital supply | +5 V logic rail powering control logic and output buffers; must be decoupled to Pin 15 (DIG COM) |
| Pin 9 (ANA COM) | Analog ground reference | High-stability reference node for internal reference and analog input; must connect directly to system analog ground plane |
| Pin 13 (10VIN) | Unipolar 10 V input | Accepts 0 V to +10 V signals with 5 kΩ input impedance; used with Pin 9 for standard unipolar range |
| Pin 14 (20VIN) | Unipolar 20 V input | Accepts 0 V to +20 V signals with 10 kΩ input impedance; used with Pin 9 for extended unipolar range |
| Pin 12 (BIP OFF) | Bipolar offset adjust | Connects to 10 V reference (Pin 8) for bipolar mode; trimmable to null major carry transition at analog common |
| Pin 8 (REF OUT) | Reference output | 10.00 V ±0.2% buffered Zener output; supplies up to 1.5 mA but must remain constant during conversion |
| Pin 10 (REF IN) | Reference input | Feedback node for full-scale calibration; 50 Ω resistor to Pin 8 sets full-scale point |
| Pins 16–27 (DB11–DB0) | Digital data outputs | Tri-state parallel outputs; MSB (DB11) to LSB (DB0); enabled by CE/CS/R/C/AO logic per truth table |
| Pin 28 (STS) | Status flag | Active-high open-collector output indicating conversion in progress; goes low when result is ready |
| Pins 2, 3, 4, 5 (CE, CS, R/C, A0) | Control inputs | Enable, select, read/convert, and byte-address logic; TTL-compatible except 12/8 (Pin 15), which must be hard-wired to VLOGIC or DIG COM |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 10 V reference | Eliminates external reference IC and associated trimming; ±0.2% initial accuracy and <50 ppm/°C full-scale drift over temperature |
| Self-contained SAR architecture | Requires no external DAC, clock generator, or comparator - reduces BOM count and layout complexity |
| Configurable 12-/8-bit operation | AO and 12/8 pins allow flexible interface to 8-bit microcontrollers without glue logic or data alignment firmware |
| Tri-state parallel outputs | Enables direct connection to shared data buses; avoids need for external bus transceivers in multi-device systems |
| Multiple input span support | Hardware-selectable 10 V / 20 V unipolar and ±5 V / ±10 V bipolar ranges reduce need for external signal conditioning amplifiers |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Digitizing 4–20 mA current loop outputs from pressure, temperature, and flow sensors in PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC converting conditioned analog sensor voltage (0–10 V) into 12-bit digital values for microcontroller processing. Use Value: ±1 LSB linearity ensures <0.025% full-scale error across 0°C to +70°C, meeting SIL-2 functional safety requirements for field instrumentation. | Use Scenario: High-accuracy DC voltage measurement in benchtop multimeters and automated test equipment (ATE). IC Role / Device Role / Timing Role: Standalone ADC capturing stable DC inputs with minimal external components; reference stability enables repeatable 0.01% measurements. Use Value: Integrated 10 V Zener reference (±0.2%) and on-chip trimming eliminate calibration drift, reducing annual recalibration labor by >60%. |
| Avionics Sensor Interface | Medical Diagnostic Signal Acquisition |
Use Scenario: Converting analog outputs from accelerometers and gyros in flight control computers where board space and reliability are critical. IC Role / Device Role / Timing Role: Ruggedized ADC operating from ±15 V supplies; STS flag synchronizes data capture with flight control timing cycles. Use Value: 35 µs conversion time and guaranteed monotonicity prevent missed samples during rapid attitude changes, supporting 20 Hz closed-loop response. | Use Scenario: Digitizing ECG, EEG, and bio-potential signals in portable diagnostic devices requiring low-noise, calibrated front-end acquisition. IC Role / Device Role / Timing Role: Precision ADC accepting ±5 V bipolar inputs directly from instrumentation amplifiers; unipolar/bipolar flexibility simplifies channel configuration. Use Value: 11-bit no-missing-codes guarantee ensures all physiological waveform transitions are captured without code gaps, preserving diagnostic fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7874KN | 12-bit, 100 kSPS, single +5 V supply, serial SPI interface; no internal reference | Requires external reference and level-shifting for ±15 V analog inputs; better suited for low-power, space-constrained designs | Select AD7874KN only if system already uses +5 V-only supply rails and SPI bus infrastructure; not drop-in for AD574AJN's parallel interface or dual-supply analog path |
| ADS7800KP | 12-bit, 10 µs conversion, single +5 V supply, internal reference (2.5 V), parallel output | Lower full-scale range (0–2.5 V); requires external gain stage for ±10 V inputs; higher speed but lower absolute accuracy (±4 LSB) | Choose ADS7800KP for high-throughput applications with limited supply voltage; avoid where ±10 V direct input or ±1 LSB linearity is mandatory |
Compared with AD7874KN and ADS7800KP, the AD574AJN uniquely combines ±15 V analog input capability, integrated 10 V reference, and parallel 12-bit output in a single DIP package - making it irreplaceable in legacy industrial controllers and test gear requiring minimal external components and proven long-term stability.
Availability
AD574AJN is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, avionics sensor interface, and medical diagnostic signal acquisition requiring stable component supply across extended product lifecycles.
Supply support for AD574AJN 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD574A family was designed specifically for high-accuracy, self-contained data acquisition in industrial, military, and instrumentation systems where reliability, long-term calibration stability, and minimal external component count are critical design constraints.
FAQ
What is the maximum conversion time of the AD574AJN?
The AD574AJN has a maximum conversion time of 35 µs for a full 12-bit conversion cycle at +25°C and nominal supplies. This value increases slightly at temperature extremes but remains within specification across its 0°C to +70°C operating range. The AD574AJN also supports an 8-bit short-cycle mode with ≤24 µs conversion time, useful for coarse/fine acquisition strategies. This timing is guaranteed independent of input signal level or reference loading, provided the 10 V reference remains stable during conversion.
Does the AD574AJN require external calibration components?
The AD574AJN includes on-chip thin-film trimming resistors and supports optional external trims for unipolar offset (Pin 12) and full-scale calibration (Pin 8 to Pin 10). For many applications, no external trims are needed - the AD574AJN guarantees ±1 LSB linearity and ±0.25% full-scale error without adjustment. If tighter accuracy is required, a 100 kΩ potentiometer at Pin 12 and a 50 Ω ±1% metal film resistor between Pins 8 and 10 suffice. The AD574AJN's internal reference and matched resistors eliminate the need for external DACs, op amps, or precision references.
Can the AD574AJN operate from ±12 V supplies instead of ±15 V?
Yes, the AD574AJN is fully specified for operation from ±12 V supplies (VCC = +12 V ±0.6 V, VEE = –12 V ±0.6 V) as well as ±15 V. However, when using ±12 V, the internal 10 V reference output (Pin 8) must be buffered with an external op amp before driving any load that varies during conversion - because the reference output current capability drops under lower supply conditions. The AD574AJN's power supply rejection specifications (±1 LSB full-scale shift) are validated for both ±12 V and ±15 V operation, ensuring consistent performance across either rail set.
What is the purpose of the 12/8 pin on the AD574AJN?
The 12/8 pin (Pin 15) configures the AD574AJN's data output format: when tied to VLOGIC (+5 V), it enables 12-bit parallel output on DB11–DB0; when tied to DIGITAL COMMON (Pin 15), it enables two 8-bit byte reads (MSBs first, then LSBs + trailing zeros). This pin is not TTL-compatible and must be hard-wired - never driven by logic - to avoid contention. The AD574AJN uses this pin to simplify interfacing with both 8-bit and 16-bit microprocessors without external multiplexing logic, and its behavior is defined in Table I of the AD574AJN datasheet.
How does the AD574AJN handle bipolar versus unipolar input ranges?
The AD574AJN supports both unipolar (0 V to +10 V or 0 V to +20 V) and bipolar (±5 V or ±10 V) input ranges via dedicated pins: 10VIN (Pin 13), 20VIN (Pin 14), and BIP OFF (Pin 12). For unipolar operation, the analog signal connects between 10VIN or 20VIN and ANA COM (Pin 9); for bipolar, BIP OFF is connected to REF OUT (Pin 8), and the signal connects between 10VIN/20VIN and ANA COM. The AD574AJN's internal 10 kΩ bipolar offset resistor and trimmed scaling network ensure correct major-carry transition at analog common, delivering guaranteed 11-bit no-missing-codes performance in bipolar mode across temperature.
AD574AJN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±11.4V ~ 16.5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD574AJN FAQ
1.How can I place an order for AD574AJN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD574AJN 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 AD574AJN reliable?
The price and inventory of AD574AJN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD574AJN is usually 5 days.
3.What payment methods are accepted for AD574AJN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD574AJN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD574AJN?
AD574AJN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD574AJN 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 AD574AJN?
For technical support, including AD574AJN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD574AJN requirements.
6.How does Aetrix verify that AD574AJN is sourced from the original manufacturer or authorized distributors?
All AD574AJN 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 AD574AJN meets industry standards.
7.What is the process for return or replacement of AD574AJN?
All AD574AJN units undergo pre-shipment inspection (PSI). If there is an issue with AD574AJN, 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 AD574AJN part is unused and in its original packaging.
Return procedure for AD574AJN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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