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Analog Devices Inc. AD574ALD
- Part No.:
- AD574ALD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD574ALD.pdf
- Description:
- IC ADC 12BIT SAR 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,857
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Product details
Overview
AD574ALD 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 ±1/2 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 features internal 10.00 V ±0.02 V buried Zener reference. It is used in precision industrial data acquisition, test equipment, and process control systems requiring high DC accuracy without external calibration components.
For engineers reviewing the AD574ALD datasheet, AD574ALD pinout, AD574ALD application, or AD574ALD equivalent, key selection considerations include guaranteed 12-bit no-missing-codes performance, ±1/2 LSB total unadjusted error (TUE), ceramic DIP-28 package for thermal stability, and compatibility with 8-bit or 12-bit parallel microprocessor buses via configurable AO and 12/8 control pins.
Technical Context
The AD574ALD implements a fully self-contained successive-approximation architecture with integrated 12-bit current-output DAC, comparator, SAR logic, and temperature-compensated buried Zener reference. Its conversion cycle is initiated by CE/CS/R/C control signals and completes in 15–35 µs for 12-bit mode, with STS output indicating active conversion.
It supports dual data formats: left-justified 12-bit parallel output (12/8 = VLOGIC) or two 8-bit nibble reads (12/8 = DIGITAL COMMON), with AO selecting MSB or LSB nibble. Input impedance is 5 kΩ (10 V span) or 10 kΩ (20 V span); reference output supplies up to 1.5 mA but requires buffering under ±12 V operation or dynamic loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete digital codes across full-scale range |
| Linearity Error (TMIN–TMAX) | ±1/2 LSB - ensures monotonicity and guarantees no missing codes at 12-bit resolution over 0°C to +70°C |
| Full-Scale Calibration Error | 0.125% of FS - corresponds to ≤5 LSB error at 10 V span, trimmable to zero with external 50 Ω resistor |
| Internal Reference Voltage | 10.00 V ±0.02 V - stable buried Zener source enabling absolute accuracy without external reference |
| Conversion Time (12-bit) | 15 µs (typ), 35 µs (max) - deterministic timing suitable for synchronous sampling in real-time control loops |
| Power Supply Range | 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 system rails |
| 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 scaling resistors |
Pinout & Package
Ceramic Dual-In-Line Package (D-28), hermetically sealed, rated for 0°C to +70°C operation. Pin 1 index located at top-left corner when notch faces upward; pin numbering follows standard DIP convention (counter-clockwise from index).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | DIGITAL COMMON (DC) | Logic ground reference for CE, CS, R/C, A0, 12/8, and DBx outputs; must tie to system digital ground |
| 2–13, 16–27 | DB11–DB0 | Three-state parallel data outputs (MSB DB11 to LSB DB0); enabled only after conversion completion and proper CE/CS/R/C/A0 state |
| 14 | STS (Status) | Active-high open-collector output signaling conversion in progress; low = data ready for read |
| 28 | ANALOG COMMON (AC) | Analog ground reference for REF IN, BIP OFF, 10VIN, 20VIN, and internal reference; must connect directly to high-quality analog ground |
| 8, 10 | REF OUT / REF IN | 10 V reference output and input; REF OUT supplies internal DAC and external circuitry; REF IN accepts external reference if internal disabled |
| 12 | BIP OFF | Bipolar offset adjustment node; connected to AC for unipolar mode, to REF OUT for bipolar mode |
| 13, 14 | 10VIN / 20VIN | Dedicated analog inputs for 10 V or 20 V unipolar spans; internal 5 kΩ or 10 kΩ scaling resistors eliminate external gain components |
| 9 | VEE | Negative supply rail (–12 V or –15 V); powers internal DAC, comparator, and reference circuitry |
| 20 | VCC | Positive supply rail (+12 V or +15 V); powers internal logic and analog sections except reference |
| 23 | VLOGIC | +5 V logic supply; powers digital interface (CE, CS, R/C, A0, 12/8, DBx) and defines logic thresholds |
| 4, 5, 6, 7 | CE, CS, R/C, A0 | Control inputs: Chip Enable, Chip Select, Read/Convert, Byte Address; define conversion start, data format, and nibble selection |
| 25 | 12/8 | Data format select: tied to VLOGIC for 12-bit parallel output; tied to DC for 8-bit bus-compatible dual-nibble mode |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 10.00 V reference | Eliminates need for external voltage reference IC or trimming network, reducing BOM count and layout area |
| Guaranteed no missing codes | Ensures monotonic 12-bit transfer function across full temperature range-critical for closed-loop control and servo applications |
| Selectable 8-/12-bit conversion modes | Reduces conversion time to 10–24 µs for 8-bit results while maintaining pin compatibility and software flexibility |
| Configurable parallel data interface | Supports direct connection to 8-bit microcontrollers (via nibble reads) or 16-bit processors (full 12-bit word) without glue logic |
| Internal thin-film trimmed resistors | Enables absolute accuracy without factory calibration; AD574ALD grade achieves ±1/2 LSB linearity without user trim |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
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 capturing sensor outputs at 100 Hz–1 kHz sample rates with deterministic 35 µs conversion latency. Use Value: ±1/2 LSB linearity ensures <0.012% measurement uncertainty across temperature, meeting IEC 61000-4-3 immunity requirements for factory-floor deployment. |
Use Scenario: High-accuracy DC voltage measurement channel in benchtop multimeters and parametric analyzers. IC Role / Device Role / Timing Role: Standalone 12-bit digitizer interfaced to FPGA controller; performs auto-ranging via programmable 10 V/20 V input selection. Use Value: Internal 10.00 V reference and no-missing-codes guarantee enable 0.025% basic accuracy without periodic recalibration. |
| Aerospace Sensor Interface | Medical Instrumentation |
|
Use Scenario: Digitizing strain gauge and RTD bridge outputs in flight control surface position sensors. IC Role / Device Role / Timing Role: Ruggedized ADC in ceramic DIP-28 package operating at 0°C–+70°C; interfaces to MIL-STD-1553 bus controller via isolator. Use Value: Ceramic package and ±1/2 LSB TUE support DO-160E Section 22 vibration/temperature compliance without derating. |
Use Scenario: Analog front-end for patient vital sign monitors measuring ECG amplitude and respiration transducer outputs. IC Role / Device Role / Timing Role: Low-noise, low-drift ADC acquiring bio-potential signals at 250 SPS with simultaneous 50/60 Hz notch filtering in firmware. Use Value: Unipolar offset ≤±1 LSB and full-scale tempco ≤2 ppm/°C ensure <1 µV drift over clinical operating ambient (15°C–30°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 |
|---|---|---|---|
| AD7896ARZ | SAR ADC with SPI interface, 100 kSPS throughput, no internal reference; requires external 2.5 V ref and driver op amp | Designed for low-power portable instrumentation; lacks parallel bus interface and on-chip reference | Choose AD7896ARZ when board space, power budget (<5 mW), or serial interface simplicity outweigh need for self-contained parallel ADC |
| ADS7800U | 12-bit SAR ADC with 10 V internal reference, 10 µs conversion, but plastic SOIC-24 package and ±1 LSB linearity (not ±1/2 LSB) | Targeted at cost-sensitive industrial controls; lower thermal stability and reduced DC accuracy vs. AD574ALD | Choose ADS7800U where ceramic packaging and guaranteed 12-bit monotonicity are not required, and faster conversion is prioritized |
Compared with AD7896ARZ and ADS7800U, the AD574ALD uniquely combines ceramic DIP-28 ruggedness, guaranteed ±1/2 LSB linearity with no missing codes, and fully integrated reference-making it irreplaceable in legacy military, aerospace, and high-reliability industrial systems where long-term calibration stability and deterministic parallel timing are mandatory.
Availability
AD574ALD is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, aerospace sensor interface, and medical instrumentation requiring stable component supply across extended product lifecycles.
Supply support for AD574ALD 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 as a complete, self-contained 12-bit data acquisition solution for systems requiring high DC accuracy, minimal external components, and robust operation in harsh environments-targeting industrial control, defense electronics, and precision instrumentation.
FAQ
What is the maximum operating temperature range for the AD574ALD?
The AD574ALD is rated for operation from 0°C to +70°C. This temperature range is explicitly defined in the Ordering Guide for the "L" grade and confirmed in the specifications table under Temperature Range. Operation outside this range may result in degraded linearity, increased offset drift, or noncompliance with the guaranteed ±1/2 LSB linearity specification. The ceramic D-28 package provides superior thermal stability within this envelope compared to plastic alternatives.
Does the AD574ALD require external calibration components?
The AD574ALD does not require external calibration components for basic operation. Its thin-film trimmed resistors and temperature-compensated buried Zener reference enable out-of-box accuracy. However, fine calibration is supported: unipolar offset can be adjusted via Pin 12, and full-scale calibration via a 50 Ω resistor between Pins 8 and 10. For AD574ALD, typical full-scale error is ±2 LSB and offset is ≤±1 LSB-both trimmable to zero if system-level accuracy demands exceed these values.
Can the AD574ALD operate with ±12 V power supplies instead of ±15 V?
Yes, the AD574ALD supports ±12 V supplies per its Absolute Maximum Ratings and Power Supplies specification table (VCC = +11.4 V to +16.5 V; VEE = –11.4 V to –16.5 V). However, the internal reference output current drops to ≤1.0 mA at ±12 V, and external loads must remain constant during conversion. Analog Devices recommends buffering the REF OUT with an op amp (e.g., AD707) when using ±12 V supplies or driving dynamic loads to maintain 10.00 V stability and prevent conversion errors.
How does the AD574ALD handle analog input impedance variations across input ranges?
The AD574ALD provides fixed input impedances: 5 kΩ for the 10 V span (Pin 13) and 10 kΩ for the 20 V span (Pin 14), both trimmed during manufacturing. These values are specified in the Analog Input section under Input Impedance (3–7 kΩ typ for 10 V span; 6–14 kΩ typ for 20 V span). The device expects low-impedance drive-source impedance should be <50 Ω for 12-bit accuracy-and uses internal scaling resistors so no external gain-setting components are needed regardless of selected range.
Is the AD574ALD pin-compatible with other AD574A variants like AD574AKD or AD574ASD?
Yes, all AD574A variants-including AD574ALD, AD574AKD, and AD574ASD-share identical pinout, package (D-28 ceramic), and electrical interface. Differences lie solely in grade-specific performance: AD574ALD guarantees ±1/2 LSB linearity and 12-bit no-missing-codes over 0°C to +70°C; AD574AKD offers same specs but with tighter full-scale tempco (27 ppm/°C vs. 10 ppm/°C for AD574ALD); AD574ASD extends temperature range to –55°C to +125°C but with ±1 LSB linearity. PCB design is fully reusable across these variants.
AD574ALD 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:
- -
AD574ALD FAQ
1.How can I place an order for AD574ALD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD574ALD 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 AD574ALD reliable?
The price and inventory of AD574ALD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD574ALD is usually 5 days.
3.What payment methods are accepted for AD574ALD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD574ALD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD574ALD?
AD574ALD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD574ALD 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 AD574ALD?
For technical support, including AD574ALD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD574ALD requirements.
6.How does Aetrix verify that AD574ALD is sourced from the original manufacturer or authorized distributors?
All AD574ALD 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 AD574ALD meets industry standards.
7.What is the process for return or replacement of AD574ALD?
All AD574ALD units undergo pre-shipment inspection (PSI). If there is an issue with AD574ALD, 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 AD574ALD part is unused and in its original packaging.
Return procedure for AD574ALD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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