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Analog Devices Inc. SDC1768511
- Part No.:
- SDC1768511
- Manufacturer:
- Analog Devices Inc.
- Category:
- Encoders, Decoders, Converters
- Package:
- -
- Datasheet:
-
SDC1768511.pdf
- Description:
- SYNCHRO--TO DIGITAL CONVERTER (H
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Product details
Overview
SDC1768511 from Analog Devices is a 14-bit hybrid synchro/resolver-to-digital converter with ±5.3 arc minute accuracy, 36 RPS tracking rate, and internal isolating transformers for true signal/reference isolation. It delivers TTL-compatible parallel natural binary output with three-state latched MSB/LSB enable control, and supports 90V/26V/11.8V signal and reference inputs in resolver or synchro format - used in avionic fire control systems requiring high-reliability angular position conversion.
For engineers reviewing the SDC1768511 datasheet, SDC1768511 pinout, SDC1768511 application, or SDC1768511 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation value, and two confirmed alternative models with documented functional and packaging differences.
Technical Context
The SDC1768511 implements a Type II servo loop architecture with phase-sensitive detection, integrator, and VCO to continuously null Sin(θ − φ), enabling true continuous tracking even during data transfer. Its internal Scott-T transformer pair converts 3-wire synchro inputs to resolver format, while 4-wire resolver inputs pass through isolated transformers without transformation.
It features dual independent three-state enables (ENABLE M for MSB8, ENABLE L for LSB6), separate INHIBIT input that freezes latch updates without disturbing the internal servo loop, and analog velocity/error outputs derived directly from the closed-loop control signal - all operating across −55°C to +125°C with hermetic metal DIP-32 packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14 bits (1 LSB = 1.3 arc minutes) - defines minimum resolvable shaft angle increment in precision motion control. |
| Accuracy | ±5.3 arc minutes max error - guaranteed angular position fidelity under full temp range and ±10% signal/reference amplitude variation. |
| Tracking Rate | 36 RPS - maximum sustained shaft rotation speed the converter can follow without loss of lock or increased error. |
| Signal Input Format | 4-wire resolver or 3-wire synchro + reference - selectable via external wiring; no mode pins required. |
| Reference Frequency | 400 Hz (per option code Y=1) - sets fundamental timing for resolver excitation and loop synchronization. |
| Power Supply | +15 V, −15 V, +5 V - triple-rail operation required; each rail must be decoupled with 0.1 µF + 6.8 µF capacitors. |
| Isolation Voltage | 350 V dc (signal & reference to GND) - enables direct connection to high-voltage motor or actuator feedback without external isolation. |
Pinout & Package
SDC1768511 is housed in a hermetically sealed metal dual-in-line package (DIP-32) measuring 1.74″ × 1.14″ × 0.28″ (44.2 × 28.9 × 7.1 mm), with glass-bead standoffs and pin 1 identified by green glass bead. Pin 12 is unconnected; pins 1–14 carry the 14-bit parallel output (MSB to LSB), with ENABLE M (pin 25) and ENABLE L (pin 26) controlling MSB8 and LSB6 respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–14 | Digital Output (MSB to LSB) | Parallel natural binary word representing shaft angle; latched and three-state controlled by ENABLE M/L. |
| 15 | GND | Common ground reference for power, logic, and analog sections; must be low-impedance system return. |
| 16 | +5 V | Logic supply for output latches and interface circuitry; requires local 0.1 µF + 6.8 µF decoupling. |
| 17 | +15 V | Analog positive supply for internal amplifiers and VCO; reverse polarity will destroy device. |
| 18 | −15 V | Analog negative supply; same polarity sensitivity as +15 V; must not float or exceed −17 V absolute max. |
| 19 | RHI | High-side reference input (11.8 V/26 V/90 V rms); connected to transformer primary for isolation. |
| 20 | RLO | Low-side reference input; completes reference winding path; tied to system ground in most configurations. |
| 21–24 | S1–S4 | Resolver signal inputs (S1/S2 = sine, S3/S4 = cosine); accept 11.8 V/26 V/90 V rms differential signals. |
| 25 | ENABLE M | Active-low enable for MSB8 (pins 1–8); allows multiplexing multiple converters on shared data bus. |
| 26 | ENABLE L | Active-low enable for LSB6 (pins 9–14); independent control enables partial-word reads in resource-constrained systems. |
| 27 | INHIBIT | Active-low latch freeze; halts update of output latches without affecting internal servo loop stability or tracking. |
| 28 | BUSY | Open-collector logic output pulsed high (≤1.2 µs typ) during counter/latch update; used for synchronous read timing. |
| 29 | VELOCITY | Analog voltage proportional to input angular velocity (negative = increasing θ); uncalibrated but monotonic. |
| 30 | ERROR | Built-in test output; stays ≤±30 mV during normal tracking; jumps to ≥±200 mV on loss-of-lock or over-acceleration. |
| 31 | CASE | Electrically connected to metal package shell; must be tied to system chassis or safety ground. |
| 32 | NC | No connect - pin 12 is also unconnected per mechanical drawing; both pins must remain floating. |
Key Features
| Feature | Design Value |
|---|---|
| Internal isolating transformers | Eliminates need for external isolation components; supports 350 V dc withstand between signal/reference and GND. |
| Continuous tracking during data transfer | Maintains servo loop closure and angle tracking even while latched outputs are being read - no position discontinuity. |
| Separate MSB/LSB three-state enables | Enables time-multiplexed 14-bit reads on 8-bit buses; avoids bus contention when multiple converters share one data path. |
| Analog velocity output | Provides real-time derivative of shaft angle without external differentiation; usable for feedforward control in servo loops. |
| Laser-trimmed accuracy | Guarantees ±5.3 arc minute total error without external calibration or potentiometer adjustment. |
| Hermetic metal DIP-32 packaging | Meets MIL-STD-883 screening requirements for high-reliability aerospace applications including burn-in and gross leak testing. |
Applications
| Avionic Fire Control Systems | Servo Mechanism Feedback |
|---|---|
|
Use Scenario: Real-time azimuth/elevation tracking of gun turrets or radar dishes under high-G maneuver conditions. IC Role / Device Role / Timing Role: Primary angular position transducer converting resolver feedback from hydraulic actuators into digital angle data for flight control computers. Use Value: 36 RPS tracking rate and ±5.3 arc minute accuracy ensure weapon aiming remains within lethal envelope during rapid target acquisition. |
Use Scenario: Closed-loop position control of aircraft control surfaces (elevons, rudders) using electro-hydraulic actuators. IC Role / Device Role / Timing Role: Resolver-to-digital interface providing high-fidelity shaft angle to servo drive microcontrollers with minimal latency. Use Value: Continuous tracking during data reads prevents position glitches that could destabilize flight control laws during transient maneuvers. |
| Antenna Monitoring Systems | Engine Controllers |
|
Use Scenario: Monitoring rotational alignment of satellite communication dish arrays on maritime or airborne platforms subject to vibration and thermal drift. IC Role / Device Role / Timing Role: High-stability angular encoder interfacing with resolver-equipped gimbal motors to report absolute orientation to telemetry systems. Use Value: Hermetic DIP-32 packaging and −55°C to +125°C operation ensure uninterrupted performance in harsh environmental enclosures. |
Use Scenario: Measuring turbine shaft angular position and rotational velocity in gas turbine engine FADEC units. IC Role / Device Role / Timing Role: Dual-role converter supplying both digital angle (for ECU position lookup tables) and analog velocity (for fuel scheduling algorithms). Use Value: Integrated VELOCITY and ERROR outputs reduce component count versus discrete op-amp differentiators and comparators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchro/resolver-to-digital conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SDC1767511 | 12-bit resolution (5.3 arc min LSB), ±8.5 arc min accuracy, 18 RPS tracking rate, LSB4 output (pins 1–12 only). | Lower cost and power for non-critical positioning where 14-bit fidelity is unnecessary - e.g., cockpit display attitude indicators. | Select SDC1767511 when angular resolution >1.3 arc min and tracking rate <36 RPS are acceptable; shares identical pinout and package. |
| DRC1765 | 14-bit digital-to-resolver converter (reverse function), ±2 arc min accuracy, no velocity/error outputs, requires external reference oscillator. | Used in closed-loop torque control where digital command signals must drive resolver-based actuators - not a drop-in replacement. | Choose DRC1765 only for D/A conversion paths; incompatible pinout, power scheme, and signal flow versus SDC1768511. |
Compared with SDC1768511, SDC1767511 offers lower resolution and tracking performance in the same footprint for cost-sensitive avionics, while DRC1765 serves an entirely inverse signal chain and cannot substitute for angular sensing.
Availability
SDC1768511 is available at Aetrix Electronics and suitable for avionic fire control systems, servo mechanism feedback loops, antenna monitoring systems, and engine controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SDC1768511 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 is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The SDC1768511 belongs to Analog Devices' legacy hybrid synchro/resolver converter product line, engineered for military-grade reliability in aerospace and defense motion control systems where isolation, accuracy, and continuous tracking are non-negotiable.
FAQ
What is the reference frequency supported by SDC1768511?
The SDC1768511 supports 400 Hz reference frequency, as indicated by option code Y=1 in its part number suffix. This frequency drives the internal resolver excitation and servo loop timing; deviation beyond ±10% degrades accuracy and tracking stability. The device does not support 2.6 kHz operation - that option applies only to SDC1768 variants with Y=4.
Does SDC1768511 require external trimming or calibration?
No, the SDC1768511 uses laser-trimmed thin-film resistors and matched components to achieve ±5.3 arc minute accuracy without external adjustments. No potentiometers, zero-adjusts, or gain trims are needed - full specification compliance is guaranteed at power-up across −55°C to +125°C after standard decoupling capacitor installation.
Can SDC1768511 interface directly with a 3.3 V microcontroller data bus?
No, SDC1768511 outputs are strictly TTL-compatible (0.4 V low, 2.4 V high) and require +5 V supply; they are not 3.3 V tolerant. Direct connection risks damage or logic misreads. A level-shifting buffer such as SN74LVC244A is required to interface with 3.3 V systems while preserving three-state control integrity.
What is the purpose of the ERROR output on SDC1768511?
The ERROR output on SDC1768511 is a built-in test point indicating servo loop health: it remains ≤±30 mV during valid tracking but transitions abruptly to ≥±200 mV upon loss-of-lock, excessive acceleration (>5×Kₐ), or internal fault. It is not linear with error magnitude and must not be used for closed-loop correction - only for diagnostic flagging.
Is SDC1768511 pin-compatible with earlier SDC1740-series converters?
No, SDC1768511 is not pin-compatible with SDC1740-series devices. While both use DIP-32 packages, SDC1768511 has dedicated VELOCITY and ERROR outputs (pins 29–30), relocated ENABLE pins (25–26), and different power pin assignments. SDC1740 lacks velocity/error outputs and uses different logic enable architecture - PCB redesign is required for replacement.
SDC1768511 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Applications:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
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- Supplier Device Package:
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SDC1768511 FAQ
1.How can I place an order for SDC1768511 through Aetrix?
Please submit a Request for Quotation (RFQ) for SDC1768511 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 SDC1768511 reliable?
The price and inventory of SDC1768511 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDC1768511 is usually 5 days.
3.What payment methods are accepted for SDC1768511?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDC1768511 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDC1768511?
SDC1768511 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDC1768511 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 SDC1768511?
For technical support, including SDC1768511 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDC1768511 requirements.
6.How does Aetrix verify that SDC1768511 is sourced from the original manufacturer or authorized distributors?
All SDC1768511 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 SDC1768511 meets industry standards.
7.What is the process for return or replacement of SDC1768511?
All SDC1768511 units undergo pre-shipment inspection (PSI). If there is an issue with SDC1768511, 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 SDC1768511 part is unused and in its original packaging.
Return procedure for SDC1768511:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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