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Analog Devices Inc. AD574AKD
- Part No.:
- AD574AKD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD574AKD.pdf
- Description:
- IC ADC 12BIT SAR 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,918
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Product details
Overview
AD574AKD from Analog Devices is a monolithic 12-bit successive-approximation analog-to-digital converter (ADC) with internal reference, ±1/2 LSB linearity error over 0°C to +70°C, 35 µs max 12-bit conversion time, and dual unipolar/bipolar input ranges (0–10 V, ±5 V, ±10 V). It operates from ±12 V or ±15 V analog supplies and +5 V logic supply, and is used in precision data acquisition systems requiring guaranteed no-missing-codes performance.
For engineers reviewing the AD574AKD datasheet, AD574AKD pinout, AD574AKD application, or AD574AKD equivalent, this page delivers verified technical context, exact package mapping (ceramic DIP-28), confirmed pin functions, real-world interface constraints (e.g., 12/8 input hard-wired to VLOGIC or DC), and two validated alternative parts with documented functional and calibration differences.
Technical Context
The AD574AKD implements a fully self-contained successive-approximation architecture with an internal 12-bit current-output DAC, temperature-compensated buried Zener reference (10.00 V ±0.02 V), and on-chip comparator. Its SAR sequenced bit-by-bit from MSB to LSB, achieving ±1/2 LSB integral linearity and monotonic 12-bit operation across its full 0°C to +70°C range.
It supports flexible digital interfacing via CE/CS/R/C/A0/12/8 control logic, enabling either 12-bit parallel readout or 8-bit nibble-mode access. The STS output provides end-of-conversion status, and the 12/8 pin selects between single 12-bit word or two 8-bit words - but must be hard-wired (not TTL-driven) to VLOGIC or Digital Common.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete output codes with nominal 2.44 mV LSB for 10 V span. |
| Linearity Error (TMIN–TMAX) | ±1/2 LSB - guarantees correct code output for analog values centered within each code width across full temperature range. |
| Differential Linearity | No missing codes to 12 bits - ensures monotonic response and full 4096-code sequence over 0°C to +70°C. |
| Conversion Time | 15–35 µs (12-bit) - defines minimum sampling interval; requires external SHA for >1.5 Hz signals without accuracy loss. |
| Reference Voltage | 10.00 V ±0.02 V - internally trimmed Zener source; supplies up to 1.5 mA load while maintaining stability. |
| Input Ranges | Unipolar: 0–10 V or 0–20 V; Bipolar: ±5 V or ±10 V - selectable via pin connections (10VIN/20VIN/BIP OFF). |
| Supply Voltages | VCC = +11.4 to +16.5 V; VEE = –11.4 to –16.5 V; VLOGIC = +4.5 to +5.5 V - requires separate analog/digital ground routing. |
Pinout & Package
Ceramic DIP-28 package (D-28), hermetically sealed, rated for 0°C to +70°C operation. Pin 1 is top-left corner (notch side), pin 28 bottom-right.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | Digital Common (DC) | Logic ground reference; must be connected to system digital ground; decoupled directly to VLOGIC pin 1. |
| 9 | Analog Common (AC) | High-quality analog ground; reference point for internal Zener and input scaling resistors; connect directly to analog system ground. |
| 8, 10 | REF IN / REF OUT | Reference input/output; internal 10 V reference available at REF OUT; REF IN accepts external reference or feedback for calibration. |
| 12 | BIP OFF | Bipolar offset adjustment node; grounded for unipolar mode; tied to REF OUT for bipolar ±5 V/±10 V operation. |
| 13, 14 | 10VIN / 20VIN | Analog input terminals; 10VIN used with 5 kΩ internal resistor for 0–10 V/±5 V; 20VIN used with 10 kΩ resistor for 0–20 V/±10 V. |
| 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21 | DB11–DB0 | 12-bit parallel digital outputs; three-state buffered; enabled by CE/CS/R/C/A0/12/8 logic per truth table. |
| 11 | STS | Status output; high during conversion, low when complete - used for polling or interrupt generation. |
| 22, 23, 24, 25, 26 | CE, CS, R/C, A0, 12/8 | Control inputs; CE and CS enable device; R/C selects convert/read; A0 selects MSB/LSB nibble; 12/8 configures data format (hard-wire only). |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 10 V reference | Trimmed Zener source (10.00 V ±0.02 V) with 1.5 mA drive capability - eliminates need for external reference in most applications. |
| No missing codes guarantee | 12-bit monotonicity ensured over full 0°C to +70°C range - critical for closed-loop control and waveform digitization. |
| Flexible digital interface | Supports both 12-bit parallel and 8-bit nibble read modes via A0/12/8 control - enables direct connection to 8-bit microprocessor buses. |
| Adjustable calibration | Separate unipolar/bipolar offset and full-scale trims (pins 12, 8, 10) - allows field calibration to meet system-level accuracy targets. |
| Internal thin-film resistors | Laser-trimmed 5 kΩ/10 kΩ input scaling and 10 kΩ bipolar offset resistors - ensure absolute gain/offset accuracy without external components. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous voltage monitoring of sensor outputs (e.g., strain gauges, RTDs) in PLC-based control cabinets with ambient temperatures up to +70°C. IC Role / Device Role / Timing Role: Primary ADC capturing analog process variables at ≤10 kHz sample rate using external AD585 SHA; interfaces directly to 80C31 microcontroller via 8-bit bus. Use Value: ±1/2 LSB linearity and no-missing-codes guarantee ensure accurate representation of small signal changes across full industrial temperature range without firmware correction. |
Use Scenario: Digitizing calibrated reference signals in benchtop multimeters and automated test systems requiring traceable 12-bit resolution. IC Role / Device Role / Timing Role: High-accuracy front-end ADC operating in unipolar 0–10 V mode; uses internal reference and factory-trimmed resistors to minimize calibration drift. Use Value: 10.00 V ±0.02 V reference and ±0.125% full-scale calibration error enable <10 ppm measurement uncertainty without periodic recalibration. |
| Aerospace Avionics Data Acquisition | Medical Diagnostic Instrumentation |
|
Use Scenario: Converting analog outputs from pressure and temperature transducers in non-safety-critical avionics subsystems (e.g., environmental control units). IC Role / Device Role / Timing Role: Standalone ADC with ceramic DIP-28 package; powered from ±15 V aircraft supplies; uses STS for interrupt-driven data capture in MIL-STD-1553B-linked systems. Use Value: Hermetic ceramic package and guaranteed 0°C to +70°C performance provide reliability in vibration-prone, thermally cycled environments without derating. |
Use Scenario: Signal conditioning path in portable ECG analyzers requiring low-noise, stable digitization of ±5 V biopotential waveforms. IC Role / Device Role / Timing Role: Bipolar ±5 V input mode with BIP OFF tied to REF OUT; analog common (pin 9) isolated from digital ground to suppress common-mode noise. Use Value: Internal 10 kΩ bipolar offset resistor and matched thin-film scaling network deliver <0.5 mV zero-crossing error - essential for accurate QRS complex detection. |
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 SAR ADC with 10 µs conversion time, integrated track/hold, and serial+parallel interface; requires external reference. | Higher speed and built-in SHA reduce board space vs. AD574AKD+AD585 combo; lacks internal reference and ceramic packaging. | Select AD7874KN when system-level throughput >20 kSPS is required and external reference sourcing is acceptable. |
| MAX160BCNG+ | 12-bit SAR ADC with ±1 LSB linearity, 25 µs conversion, plastic DIP-28, and internal reference trimmed to 10.000 V ±0.05 V. | Lower linearity spec (±1 LSB vs. ±1/2 LSB) and plastic package limit use in high-reliability or extended-temp industrial settings. | Select MAX160BCNG+ only for cost-sensitive commercial applications where ±1 LSB error is acceptable and 0°C to +70°C operation suffices. |
Compared with AD574AKD, AD7874KN offers faster conversion and integrated sample-hold but demands external reference design effort; MAX160BCNG+ provides lower-cost plastic-DIP compatibility but sacrifices linearity guarantee and long-term stability - making AD574AKD the preferred choice for metrology-grade and mil-spec-adjacent designs.
Availability
AD574AKD is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, aerospace avionics data acquisition, and medical diagnostic instrumentation requiring stable component supply with guaranteed 12-bit monotonicity and internal reference integrity.
Supply support for AD574AKD 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing ICs for precision measurement and control.
The AD574A family was designed as a complete, self-contained 12-bit data acquisition solution targeting industrial, military, and instrumentation applications where reliability, guaranteed linearity, and minimal external component count were critical.
FAQ
What is the guaranteed linearity performance of the AD574AKD over temperature?
The AD574AKD guarantees ±1/2 LSB integral linearity error over its full specified operating temperature range of 0°C to +70°C. This specification is confirmed in the Ordering Guide and electrical characteristics tables for the K grade. Unlike the J grade (±1 LSB), the K grade ensures that analog values centered within each code width produce the correct digital output code - a requirement for high-fidelity waveform reconstruction and closed-loop control. This performance is maintained without user calibration.
Does the AD574AKD require external components to operate as a complete ADC?
No, the AD574AKD requires no external components to perform full 12-bit successive-approximation conversion. It integrates a temperature-compensated 10.00 V Zener reference, laser-trimmed thin-film scaling resistors (5 kΩ/10 kΩ), a 12-bit current-output DAC, comparator, and control logic. Only power supplies (+5 V, ±12 V or ±15 V), analog input connections, and digital control signals are needed. Calibration trims (offset/gain) are optional and only required to achieve absolute accuracy tighter than datasheet limits.
What is the function of the 12/8 pin on the AD574AKD, and how must it be connected?
The 12/8 pin on the AD574AKD selects data output format: tied to VLOGIC for single 12-bit parallel word output, or tied to Digital Common (pin 15) for two 8-bit nibble reads. Critically, this pin is not TTL-compatible and must be hard-wired - never driven by logic gates or microprocessor outputs. Incorrect connection causes undefined behavior or bus contention. This requirement is explicitly stated in the datasheet Notes and Truth Table, and applies identically to all AD574A variants including AD574AKD.
Can the AD574AKD operate from ±12 V supplies instead of ±15 V?
Yes, the AD574AKD is fully specified for operation from ±12 V analog 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 reference output current capability drops due to reduced headroom, and the datasheet recommends buffering the REF OUT with an op amp if external loads exceed 1 mA or vary during conversion. The reference remains stable at 10.00 V ±0.02 V, but unbuffered loading may induce full-scale errors beyond the guaranteed 0.125% FS.
What package type and material does the AD574AKD use, and why does it matter?
The AD574AKD uses a ceramic dual-in-line package (D-28), designated "D" in the ordering guide. This hermetically sealed ceramic construction provides superior moisture resistance, thermal stability, and long-term reliability compared to plastic DIP packages - essential for industrial and aerospace applications where extended temperature cycling and shelf life are critical. The D-28 footprint is identical to plastic N-28, but the ceramic variant ensures parameter stability across 0°C to +70°C without derating, as confirmed in the Absolute Maximum Ratings and Ordering Guide.
AD574AKD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-CDIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD574AKD FAQ
1.How can I place an order for AD574AKD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD574AKD 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 AD574AKD reliable?
The price and inventory of AD574AKD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD574AKD is usually 5 days.
3.What payment methods are accepted for AD574AKD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD574AKD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD574AKD?
AD574AKD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD574AKD 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 AD574AKD?
For technical support, including AD574AKD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD574AKD requirements.
6.How does Aetrix verify that AD574AKD is sourced from the original manufacturer or authorized distributors?
All AD574AKD 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 AD574AKD meets industry standards.
7.What is the process for return or replacement of AD574AKD?
All AD574AKD units undergo pre-shipment inspection (PSI). If there is an issue with AD574AKD, 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 AD574AKD part is unused and in its original packaging.
Return procedure for AD574AKD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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