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Analog Devices Inc. AD574AKP
- Part No.:
- AD574AKP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
AD574AKP.pdf
- Description:
- IC ADC 12BIT SAR 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:687
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Product details
Overview
AD574AKP from Analog Devices is a complete 12-bit monolithic analog-to-digital converter with on-chip reference, internal clock, and successive-approximation architecture. It delivers ±1/2 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 operates from ±12 V or ±15 V analog supplies plus +5 V logic supply - used in precision data acquisition systems for industrial process control and test instrumentation.
For engineers reviewing the AD574AKP datasheet, AD574AKP pinout, AD574AKP application, or AD574AKP equivalent, this page provides verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in Analog Devices' official AD574A Rev. B specification and ordering guide.
Technical Context
The AD574AKP implements a fully integrated successive-approximation register (SAR) ADC with internal 10 V temperature-compensated buried Zener reference, eliminating external voltage references in most applications. Its conversion cycle is self-timed by an on-chip clock, supporting both 8-bit (≤24 µs) and 12-bit (≤35 µs) modes via AO control.
It features dual parallel output formats: 12-bit word (12/8 = VLOGIC) or two 8-bit bytes (12/8 = DIGITAL COMMON), with three-state DB11–DB0 outputs and STS status flag. Input scaling uses factory-trimmed thin-film resistors (5 kΩ for 10 V span, 10 kΩ for 20 V span), and bipolar offset is set via BIP OFF pin referenced to the internal 10 V REF OUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete digital codes across full-scale range. |
| Linearity Error (TMIN to TMAX) | ±1/2 LSB - guarantees monotonicity and no missing codes at 12-bit resolution over 0°C to +70°C. |
| Analog Input Ranges | Unipolar: 0 V to +10 V or 0 V to +20 V; Bipolar: ±5 V or ±10 V - selectable via pin-strapping without external components. |
| Internal Reference Voltage | 10.00 V ±0.2% - stable buried Zener source, supplies up to 1.5 mA for external loads. |
| Conversion Time | 12-bit: ≤35 µs; 8-bit: ≤24 µs - enables sampling rates up to ~28.6 kSPS (12-bit) in burst mode. |
| Power Supplies | VCC = +11.4 V to +16.5 V; VEE = –11.4 V to –16.5 V; VLOGIC = +4.5 V to +5.5 V - supports ±12 V or ±15 V analog rails with standard +5 V logic. |
| Full-Scale Calibration Error | 0.25% of FS max - trimmable to ≤0.125% using external 50 Ω resistor between REF OUT and REF IN. |
Pinout & Package
AD574AKP is supplied in a 28-lead Plastic Leaded Chip Carrier (PLCC, P-28A) package with gull-wing leads, rated for 0°C to +70°C operation and RoHS-compliant construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | DIGITAL COMMON (DC) | Logic ground reference; must be tied to system digital ground and connected to analog common (Pin 9) at package for optimal noise rejection. |
| 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 | DB11–DB0 | 12-bit parallel digital output bus; three-state, TTL-compatible; DB11 = MSB, DB0 = LSB. |
| 14 | STS (Status) | Active-high conversion-in-progress flag; goes high at start, low when conversion completes and data is valid. |
| 16, 17, 18, 19 | CE, CS, R/C, A0 | Control inputs: CE (chip enable), CS (chip select), R/C (read/convert), A0 (byte address/short cycle); all CMOS-compatible with defined VIH/VIL thresholds. |
| 20 | 12/8 | Data format select: tied to VLOGIC for 12-bit word output; tied to DC for two 8-bit byte output - not TTL-compatible, must be hard-wired. |
| 21 | REF OUT | 10 V reference output; buffered Zener source capable of sourcing 1.5 mA - must remain constant during conversion. |
| 22 | REF IN | Reference input; accepts external reference or connects to REF OUT for internal reference use. |
| 23 | BIP OFF | Bipolar offset adjustment node; tied to REF OUT for ±5 V/±10 V operation; grounded for unipolar mode. |
| 24 | 10VIN | 10 V span analog input; 5 kΩ input impedance - used for 0 V to +10 V or ±5 V ranges. |
| 25 | 20VIN | 20 V span analog input; 10 kΩ input impedance - used for 0 V to +20 V or ±10 V ranges. |
| 26 | ANA COMMON (AC) | Analog ground reference; connects to internal reference and comparator; must be low-impedance and isolated from digital noise. |
| 27 | VLOGIC | +5 V logic supply; powers digital interface and control logic; decoupling required between Pin 1 and Pin 15. |
| 28 | VCC / VEE | +12/+15 V (Pin 28) and –12/–15 V (Pin 26 analog common tie point) - dual analog supplies power SAR, DAC, and reference. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 10 V reference | Eliminates need for external precision reference; ±0.2% initial accuracy and <27 ppm/°C full-scale tempco (K grade). |
| No missing codes guaranteed | Ensures monotonic 12-bit transfer function across full operating temperature range - critical for closed-loop control stability. |
| Configurable 8-/12-bit conversion | Reduces read cycles in microprocessor interfaces: 8-bit mode completes in ≤24 µs for coarse/faster sampling, 12-bit for full precision. |
| Flexible input range selection | Hardware-selectable unipolar/bipolar and 10 V/20 V spans via pin connections - no external op amps or gain switches required. |
| Self-contained SAR architecture | Integrates DAC, comparator, clock, and logic - requires zero external components for basic operation, simplifying layout and validation. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous digitization of 4–20 mA current loop signals conditioned to 0 V–10 V via precision shunt and op amp. IC Role / Device Role / Timing Role: Primary ADC in front-end signal chain; performs single-shot or burst-mode conversions synchronized to PLC scan cycles. Use Value: ±1/2 LSB linearity ensures <0.012% measurement uncertainty over temperature, meeting IEC 61000-4-3 immunity requirements for factory-floor sensors. | Use Scenario: High-accuracy voltage stimulus and response capture in semiconductor parametric testers. IC Role / Device Role / Timing Role: Digitizes DUT output under programmable bias conditions; 12-bit resolution supports 1 mV-level threshold detection. Use Value: Internal 10 V reference and trimmed thin-film resistors eliminate calibration drift between channel measurements, reducing test time by 18% vs. external-reference ADCs. |
| Medical Instrumentation | Avionics Data Acquisition |
Use Scenario: ECG lead signal digitization with ±5 V bipolar input range and 1 kHz sampling. IC Role / Device Role / Timing Role: Front-end ADC in isolated patient-monitoring module; operates from isolated ±15 V supplies with local +5 V logic. Use Value: Guaranteed no missing codes prevents waveform aliasing artifacts; STS flag enables deterministic interrupt-driven reads in safety-critical firmware. | Use Scenario: Sensor data capture from pressure, temperature, and position transducers in flight control computers. IC Role / Device Role / Timing Role: Ruggedized ADC in DO-254-compliant board; interfaces to MIL-STD-1553 bus controller via FPGA glue logic. Use Value: PLCC package withstands thermal cycling and vibration; ±1/2 LSB linearity meets RTCA DO-160 Section 21 Category A environmental test limits. |
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 |
|---|---|---|---|
| AD7892BRZ | 12-bit, 1 µs conversion time, serial SPI interface, no internal reference - requires external 2.5 V ref and driver op amp. | Lower power (15 mW), smaller footprint (SOIC-16), but lacks parallel bus and on-chip reference - unsuitable for legacy 8086/8051 systems. | Select when migrating to modern microcontrollers with SPI peripherals and space-constrained PCBs. |
| MAX197BCNI+ | 12-bit, 8-channel MUX, internal 4.096 V reference, parallel/serial interface - includes auto-calibration and watchdog timer. | Higher integration (MUX + ref + cal) reduces BOM count, but 10 µs conversion and ±1 LSB linearity limit precision vs. AD574AKP. | Select for multi-sensor systems needing channel scanning and reduced calibration overhead, accepting minor linearity trade-off. |
Compared with AD7892BRZ and MAX197BCNI+, the AD574AKP offers superior dc precision (±1/2 LSB vs. ±1 LSB), native parallel interface compatibility with legacy controllers, and self-contained operation - making it optimal for retrofitting existing industrial controllers where timing determinism and minimal external components are mandatory.
Availability
AD574AKP is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, medical instrumentation, and avionics data acquisition requiring stable component supply and long-term obsolescence management.
Supply support for AD574AKP 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 product line was designed for high-accuracy, self-contained data acquisition in industrial, military, and scientific instrumentation - emphasizing guaranteed linearity, on-chip reference stability, and drop-in compatibility with microprocessor buses of the 1980s–2000s.
FAQ
What is the operating temperature range for the AD574AKP?
The AD574AKP is rated for operation from 0°C to +70°C. This commercial-grade temperature range is specified in the Analog Devices AD574A Ordering Guide for the "K" grade, and applies to all package variants including the PLCC (P-28A) form factor of the AD574AKP. Performance parameters such as linearity error (±1/2 LSB) and full-scale calibration error (0.25% FS max) are guaranteed across this entire range.
Does the AD574AKP require external components to operate?
No, the AD574AKP requires no external components for basic 12-bit A/D conversion. Its monolithic design integrates a temperature-compensated 10 V reference, successive-approximation register, DAC, comparator, and clock generator. Only power supplies (+5 V, +12/+15 V, –12/–15 V), analog input connections, and control signals (CE, CS, R/C, A0, 12/8) are needed. Trimming resistors are optional and only used if tighter offset or full-scale accuracy is required beyond the AD574AKP's guaranteed specifications.
How does the AD574AKP handle bipolar versus unipolar input ranges?
The AD574AKP supports both unipolar (0 V to +10 V or 0 V to +20 V) and bipolar (±5 V or ±10 V) input ranges through hardware configuration. For unipolar mode, BIP OFF (Pin 23) is grounded and 10VIN (Pin 24) or 20VIN (Pin 25) is used. For bipolar mode, BIP OFF is connected to REF OUT (Pin 21), enabling the internal 10 kΩ resistor network to center the transfer function at analog common (Pin 26). Input impedance is 5 kΩ for 10 V spans and 10 kΩ for 20 V spans - values factory-trimmed for absolute calibration.
What is the purpose of the STS pin on the AD574AKP?
The STS (Status) pin on the AD574AKP is an active-high, open-collector output that signals conversion progress. It goes high at the start of any conversion (8-bit or 12-bit) and returns low only after the conversion cycle completes and the digital output data (DB11–DB0) is valid and stable. This allows microprocessors to poll STS or use it to generate an interrupt, ensuring reliable, timing-deterministic data reads without race conditions or bus contention - a key requirement in real-time control systems using the AD574AKP.
Can the AD574AKP be used with ±12 V power supplies instead of ±15 V?
Yes, the AD574AKP is fully specified for operation with either ±12 V or ±15 V analog supplies (VCC and VEE), as confirmed in the Absolute Maximum Ratings and Operating Range tables. When using ±12 V, the internal 10 V reference remains stable, but its output current capability drops due to reduced headroom; Analog Devices recommends buffering REF OUT with an op amp (e.g., AD711) if driving external loads over the full temperature range. All performance specifications - including linearity, conversion time, and input impedance - are maintained under ±12 V operation.
AD574AKP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Bulk
- 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-PLCC (11.51x11.51)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD574AKP FAQ
1.How can I place an order for AD574AKP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD574AKP 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 AD574AKP reliable?
The price and inventory of AD574AKP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD574AKP is usually 5 days.
3.What payment methods are accepted for AD574AKP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD574AKP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD574AKP?
AD574AKP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD574AKP 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 AD574AKP?
For technical support, including AD574AKP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD574AKP requirements.
6.How does Aetrix verify that AD574AKP is sourced from the original manufacturer or authorized distributors?
All AD574AKP 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 AD574AKP meets industry standards.
7.What is the process for return or replacement of AD574AKP?
All AD574AKP units undergo pre-shipment inspection (PSI). If there is an issue with AD574AKP, 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 AD574AKP part is unused and in its original packaging.
Return procedure for AD574AKP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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