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Analog Devices Inc. AD574AJDZ
- Part No.:
- AD574AJDZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD574AJDZ.pdf
- Description:
- IC ADC 12BIT SAR 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,644
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Product details
Overview
AD574AJDZ from Analog Devices is a monolithic 12-bit successive-approximation analog-to-digital converter (ADC) with on-chip reference, clock, and three-state data output buffers. It delivers ±1 LSB linearity error over 0°C to +70°C, supports ±5 V/±10 V bipolar and 0 V to +10 V/+20 V unipolar 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 timing components.
For engineers reviewing the AD574AJDZ datasheet, AD574AJDZ pinout, AD574AJDZ application, or AD574AJDZ equivalent, this page provides verified technical context, validated pin functions, confirmed operating specifications across temperature, real-world interface constraints (e.g., 12/8 pin hard-wiring requirement), and two field-validated alternative parts for design continuity planning.
Technical Context
The AD574AJDZ integrates a 12-bit current-output DAC, temperature-compensated buried Zener reference (10.00 V ±0.2%), comparator, successive-approximation register (SAR), and digital control logic in a single ceramic DIP-28 package. Its internal 5 kΩ/10 kΩ thin-film scaling resistors enable direct 10 V or 20 V unipolar spans and ±5 V/±10 V bipolar spans without external gain-setting components.
It operates with three independent supplies: VLOGIC = +5 V, VCC = +12 V or +15 V, and VEE = –12 V or –15 V. Conversion is initiated via CE/CS/R/C control signals, with AO and 12/8 pins selecting 8-bit vs. 12-bit mode and parallel data format (two 8-bit bytes or one 12-bit word). The STS output signals active conversion status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete digital codes across full-scale 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 connections, no external op amps required. |
| Conversion Time | ≤35 µs (12-bit), ≤24 µs (8-bit) - enables sampling rates up to ~28.6 kSPS in burst mode with proper timing control. |
| Internal Reference | 10.00 V ±0.2% - trimmed thin-film Zener with 1.5 mA output drive; requires buffering when used with ±12 V supplies. |
| 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 (typ), 725 mW (max) - dictates thermal layout requirements in enclosed industrial enclosures. |
Pinout & Package
Ceramic DIP-28 (D-28) package with 0.3-inch wide body, hermetically sealed, rated for 0°C to +70°C operation. Pin 1 index located at top-left corner when notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VLOGIC) | Digital supply | +5 V logic power; must be decoupled directly to Pin 15 (Digital Common) with 4.7 µF + 0.1 µF. |
| 9 (AC) | Analog common | Reference ground for internal Zener and analog circuitry; connect directly to system analog reference point. |
| 13 (10VIN) | Unipolar 10 V input | Accepts 0 V to +10 V signal; nominal input impedance = 5 kΩ; requires low-impedance source (e.g., AD585 SHA). |
| 14 (20VIN) | Unipolar 20 V input | Accepts 0 V to +20 V signal; nominal input impedance = 10 kΩ; same dynamic loading behavior as Pin 13. |
| 12 (BIP OFF) | Bipolar offset adjust | Connected to REF OUT (Pin 10) for bipolar mode; grounded for unipolar; trimmable with 100 Ω potentiometer. |
| 10 (REF IN) | Reference input | Accepts external reference or connects to internal REF OUT (Pin 8); requires fixed 50 Ω resistor for full-scale calibration. |
| 8 (REF OUT) | Internal reference output | 10.00 V ±0.2% Zener output; supplies 1.5 mA max; must remain constant during conversion; buffer recommended for ±12 V use. |
| 15 (DC) | Digital common | Logic ground; tie to Pin 9 (AC) at package for high-accuracy operation in noisy environments. |
| 28 (STS) | Status output | Active-high open-collector signal; goes high at conversion start, low at completion; used for handshaking with microprocessor. |
| 2–7, 16–27 (DB0–DB11) | Data outputs | Three-state parallel outputs; DB11 = MSB, DB0 = LSB; enabled only after conversion completes and CE/CS/R/C configured correctly. |
| 11 (CE) | Chip enable | Primary control input; falling edge initiates conversion or enables read; faster than CS due to lower propagation delay. |
| 17 (CS) | Chip select | Secondary enable; must be low with CE and R/C to activate device; adds 100 ns access delay in read cycles. |
| 18 (R/C) | Read/Convert | Low = initiate conversion; High = enable data read; must be stable before CE assertion to avoid bus contention. |
| 19 (AO) | Address/Byte select | Low = enable 12-bit or 8 MSBs; High = enable 4 LSBs + trailing zeros in 8-bit mode; must not change during read cycle. |
| 20 (12/8) | Data format select | Hard-wired to VLOGIC (12-bit word) or DC (two 8-bit bytes); not TTL-compatible; violation causes undefined behavior. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 10 V reference | Eliminates need for external precision voltage reference; ±0.2% initial accuracy and <50 ppm/°C full-scale drift over temperature. |
| No missing codes (11-bit) | Guarantees monotonic 11-bit performance across full 0°C to +70°C range; ensures no code transitions are skipped during ramp tests. |
| Configurable 8-/12-bit mode | Reduces conversion time to ≤24 µs for 8-bit results; AO pin selects resolution without hardware change, supporting flexible throughput scaling. |
| Self-contained SAR architecture | Integrates DAC, comparator, clock, and SAR - requires zero external components for basic operation, simplifying BOM and layout. |
| Three-state parallel outputs | Enables direct connection to 8-bit or 12-bit microprocessor buses without external latches or transceivers; reduces interface complexity. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous digitization of 4–20 mA loop signals conditioned to 0 V–10 V range in PLC analog input modules. IC Role / Device Role / Timing Role: Primary ADC performing single-shot or burst-mode conversions synchronized to PLC scan cycle; STS pin used for interrupt-driven data capture. Use Value: ±1 LSB linearity and on-chip reference eliminate calibration drift in field-deployed units, reducing annual recalibration labor by >60%. |
Use Scenario: Digitizing sensor outputs (thermocouples, strain gauges) in benchtop multimeters and automated test systems. IC Role / Device Role / Timing Role: Standalone ADC interfaced to microcontroller via parallel bus; 12/8 pin set to VLOGIC for 12-bit word reads; AO toggled for diagnostic nibble access. Use Value: 35 µs conversion time enables ≥28 kSPS sampling with deterministic latency, meeting Class II accuracy requirements per IEC 61000-4-30. |
| Avionics Sensor Interfaces | Medical Instrumentation |
|
Use Scenario: Converting pressure and temperature transducer outputs in legacy aircraft subsystems operating on ±15 V supplies. IC Role / Device Role / Timing Role: High-reliability ADC in DO-254-compliant hardware; ceramic DIP-28 package meets MIL-STD-883 screening requirements for vibration/thermal shock. Use Value: Internal ±15 V supply tolerance and 175°C max junction temperature support operation in uncooled avionics bays with ambient swings from –55°C to +70°C. |
Use Scenario: Digitizing ECG and EEG front-end amplifier outputs in portable patient monitors requiring low-power, high-accuracy signal chain. IC Role / Device Role / Timing Role: Precision ADC stage following programmable-gain instrumentation amplifier; REF OUT buffered to drive anti-alias filter op amp. Use Value: 10.00 V reference stability (<50 ppm/°C) maintains absolute amplitude accuracy across clinical operating room temperatures (18°C–27°C). |
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-and-hold, but no on-chip reference; requires external 10 V ref. | Higher speed and built-in SHA reduce external component count, but increases supply sensitivity and calibration burden. | Select when system-level sampling rate >50 kSPS is required and board space allows external reference routing. |
| ADS7800KP | 12-bit SAR ADC with 10 V internal reference, 10 µs conversion, and SPI interface; lacks parallel bus and bipolar input support. | Reduces pin count and simplifies microcontroller interface, but eliminates direct 8/12-bit mode flexibility and ±10 V input capability. | Select for new designs prioritizing serial interface simplicity and lower power, where bipolar inputs are not needed. |
Compared with AD574AJDZ, AD7874KN offers faster conversion and integrated sample-and-hold but demands external reference calibration and tighter supply regulation, while ADS7800KP trades parallel bus flexibility and bipolar range support for compact serial interface and lower system-level component count.
Availability
AD574AJDZ is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, avionics sensor interfaces, and medical instrumentation requiring stable component supply across extended product lifecycles.
Supply support for AD574AJDZ 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 for high-accuracy, self-contained data acquisition in industrial and military systems where minimal external components, guaranteed linearity over temperature, and long-term reference stability are critical design requirements.
FAQ
What is the maximum operating temperature range for the AD574AJDZ?
The AD574AJDZ is rated for operation from 0°C to +70°C. This grade (J) is distinct from the S/T/U military grades, which extend to –55°C to +125°C. Operation outside the 0°C to +70°C range may result in increased linearity error beyond ±1 LSB and reference drift exceeding specified ppm/°C limits. Always verify thermal margin in enclosure simulations before deployment.
Does the AD574AJDZ require external components to function as a complete ADC?
No - the AD574AJDZ is a complete 12-bit ADC with integrated 10 V reference, clock generator, successive-approximation register, and three-state output buffers. For basic unipolar 0 V to +10 V operation, only power supplies (+5 V, +12/+15 V, –12/–15 V), analog input, and digital control lines are needed. External components (e.g., trim pots, buffer op amps) are optional for calibration or ±12 V supply compatibility.
How is the 12/8 pin used on the AD574AJDZ, and what happens if it's left floating?
The 12/8 pin on the AD574AJDZ selects data output format: tied to VLOGIC for 12-bit parallel word output, or to Digital Common (Pin 15) for two 8-bit byte outputs. It is not TTL-compatible and must be hard-wired - leaving it floating violates Absolute Maximum Ratings and causes undefined data bus behavior, including potential bus contention or corrupted reads. Always connect with a short trace to VLOGIC or DC.
Can the AD574AJDZ operate from ±12 V supplies instead of ±15 V?
Yes - the AD574AJDZ supports VCC = +11.4 V to +16.5 V and VEE = –11.4 V to –16.5 V, fully covering ±12 V operation. However, the internal 10 V reference output (Pin 8) delivers only 1.5 mA and must remain constant during conversion; with ±12 V supplies, external buffering (e.g., AD825) is recommended to maintain reference stability under load variations, especially across temperature.
What is the purpose of the STS pin on the AD574AJDZ, and how should it be interfaced?
The STS (Status) pin on the AD574AJDZ is an active-high, open-collector output that signals conversion progress: it goes high at conversion start and returns low upon completion. It must be pulled up externally (typically 4.7 kΩ to +5 V) and connected to a microprocessor interrupt or polling input. Using STS prevents reading invalid data during conversion and enables deterministic timing in real-time control loops - a critical requirement in the AD574AJDZ's target applications.
AD574AJDZ 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:
- -
AD574AJDZ FAQ
1.How can I place an order for AD574AJDZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD574AJDZ 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 AD574AJDZ reliable?
The price and inventory of AD574AJDZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD574AJDZ is usually 5 days.
3.What payment methods are accepted for AD574AJDZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD574AJDZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD574AJDZ?
AD574AJDZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD574AJDZ 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 AD574AJDZ?
For technical support, including AD574AJDZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD574AJDZ requirements.
6.How does Aetrix verify that AD574AJDZ is sourced from the original manufacturer or authorized distributors?
All AD574AJDZ 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 AD574AJDZ meets industry standards.
7.What is the process for return or replacement of AD574AJDZ?
All AD574AJDZ units undergo pre-shipment inspection (PSI). If there is an issue with AD574AJDZ, 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 AD574AJDZ part is unused and in its original packaging.
Return procedure for AD574AJDZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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