My Inquiry
My Account
Analog Devices Inc. AD598SD/883B
- Part No.:
- AD598SD/883B
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor and Detector Interfaces
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD598SD/883B.pdf
- Description:
- MIL LVDT SIG COND 20-CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,476
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD598SD/883B from Analog Devices is a monolithic LVDT signal conditioner IC that converts mechanical core position into a high-accuracy, ratiometric DC voltage output. It integrates a low-distortion sine-wave oscillator (20 Hz–20 kHz), dual-channel signal processing, and output amplifier - requiring only external R/C components for gain, frequency, and filtering. It supports unipolar/bipolar outputs up to ±11 V, operates from –55°C to +125°C, and interfaces directly with LVDTs and RVDTs in precision motion sensing systems.
For engineers reviewing the AD598SD/883B datasheet, AD598SD/883B pinout, AD598SD/883B application, or AD598SD/883B equivalent, key selection criteria include its ratiometric architecture (eliminating null voltage and phase-shift sensitivity), 0.05% FS linearity, ±12 V to ±18 V dual-supply operation, MIL-STD-883B qualification, and compatibility with remote LVDTs up to 300 ft.
Technical Context
The AD598SD/883B implements a patented ratiometric decoding scheme: it computes (VA – VB)/(VA + VB) using analog duty-cycle modulation and implicit feedback integration, eliminating dependence on absolute excitation amplitude or primary-to-secondary phase shift. Its internal oscillator drives the LVDT primary with 2.1–24 Vrms at user-set frequency via C1.
Signal path includes synchronous rectification-free processing, thermal-protected excitation output (30 mA rms), and output-stage current limiting (20 mA short-circuit). The device maintains full performance across –55°C to +125°C with gain drift ≤650 ppm/°C and offset drift ≤650 ppm/°C - validated per MIL-STD-883B Method 5005.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Linearity | 0.05% of full scale - ensures sub-0.5 mV error over ±10 V output range in precision displacement measurement |
| Operating Temperature | –55°C to +125°C - qualified to MIL-STD-883B, enabling use in aerospace, defense, and downhole industrial environments |
| Excitation Frequency Range | 20 Hz to 20 kHz - set by single capacitor C1, supporting aircraft 400 Hz mains or custom servo frequencies |
| Input Signal Range | 0.1 Vrms to 3.5 Vrms - accommodates low-level LVDT secondaries without preamplification |
| Output Voltage Range | ±11 V min - scalable via R2 resistor to match system ADC input or analog controller requirements |
| Power Supply | ±13 V to ±18 V dual supply - provides headroom for 10 V full-scale output with margin for ripple and load variation |
| Gain Drift | ≤650 ppm/°C of FS - enables stable calibration over extreme temperature cycling without recalibration |
| Common-Mode Rejection | 25 ppm/V (gain), 6 ppm/V (offset) - rejects noise from long cable runs between LVDT and conditioner |
Pinout & Package
AD598SD/883B is housed in a hermetically sealed 20-pin side-brazed ceramic DIP package (package option D-20), rated for military-grade reliability and thermal performance (θJA = 85°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 20 | +VS / –VS | Positive/negative power supply pins - accept ±13 V to ±18 V; require local 0.1 µF bypassing |
| 2, 3 | EXC1 / EXC2 | Differential LVDT primary drive outputs - deliver up to 24 Vrms, 30 mA rms with thermal shutdown protection |
| 10, 11 | VA / VB | LVDT secondary inputs - accept 0.1–3.5 Vrms sine waves; high-impedance (200 kΩ) with 1–5 µA bias current |
| 16, 17 | SIGNAL REF / VOUT | Output reference ground and scaled DC output - VOUT = 500 µA × R2 × (VA – VB)/(VA + VB) |
| 4, 5 | OFFSET 1 / OFFSET 2 | Offset adjustment terminals - enable 0–10 V or ±10 V output configuration via R3/R4 network |
| 6, 7 | FREQ 1 / FREQ 2 | Oscillator timing nodes - connect external capacitor C1 (e.g., 15 nF for 2.5 kHz) between FREQ1 and FREQ2 |
| 12, 13 | A1 FILT / A2 FILT | Filter inputs for VA path - connect C2/C3 to set system bandwidth (e.g., 0.4 µF for 250 Hz) |
| 14, 15 | B1 FILT / B2 FILT | Filter inputs for VB path - matched to A-path filters for balanced common-mode rejection |
| 8, 9 | LEV 1 / LEV 2 | Excitation amplitude control - connect R1 (e.g., 12.7 kΩ) to set output level from 2.6–4.1 Vrms |
| 18, 19 | FEEDBACK / OUT FILT | Output filter and feedback node - connect C4 and optional shunt capacitor across R2 to reduce ripple |
Key Features
| Feature | Design Value |
|---|---|
| Ratiometric decoding architecture | Eliminates calibration dependency on LVDT null voltage, primary-to-secondary phase shift, and excitation amplitude drift |
| Integrated oscillator + power amplifier | Drives LVDT primaries up to 24 Vrms with <–50 dB THD; frequency set by one capacitor (20 Hz–20 kHz) |
| Remote LVDT support | Operates with LVDTs located up to 300 ft away - immune to cable-induced phase shifts and attenuation |
| Position output drive capability | Drives up to 1000 ft of cable - maintains accuracy without buffer amplifiers in telemetry or distributed sensor systems |
| MIL-STD-883B qualification | Validated for –55°C to +125°C operation, including thermal cycling, shock, vibration, and hermeticity testing |
| RVDT compatibility | Directly interfaces rotary variable differential transformers - same signal chain and scaling equations apply |
Applications
| Aerospace Actuator Feedback | Industrial Proving Ring Load Cell |
|---|---|
Use Scenario: Monitoring hydraulic actuator position in flight control surfaces (e.g., elevator, rudder) under extreme thermal and vibration stress. IC Role / Device Role / Timing Role: LVDT signal conditioner converting core displacement to calibrated ±10 V analog output for FADEC or flight computer ADC input. Use Value: 0.05% FS linearity and MIL-STD-883B qualification ensure deterministic position reporting across –55°C to +125°C without recalibration or null adjustment. |
Use Scenario: High-precision static load measurement in material testing machines using steel proving rings coupled with LVDTs. IC Role / Device Role / Timing Role: Primary signal conditioner generating 0–10 V output proportional to applied force, rejecting thermal EMF and cable noise. Use Value: Common-mode rejection (6 ppm/V offset) and ratiometric operation eliminate errors from long sensor cables and ambient temperature gradients across the ring. |
| Nuclear Plant Control Rod Position | High-Reliability Servo Loop Integrator |
Use Scenario: Monitoring neutron-absorbing control rod insertion depth inside reactor containment vessels with decades-long service life. IC Role / Device Role / Timing Role: Radiation-tolerant (per MIL-STD-883B) analog interface providing fail-safe position feedback to safety-grade PLCs. Use Value: Hermetic ceramic DIP package and guaranteed 0.6% FS overall error over full temperature range ensure compliance with IEC 61508 SIL-2 functional safety requirements. |
Use Scenario: Closed-loop electromechanical servo where AD598SD/883B output directly drives motor amplifier in position-hold applications. IC Role / Device Role / Timing Role: Dual-function block: LVDT conditioner + loop integrator - output voltage integrates position error to generate velocity command. Use Value: Built-in feedback node (Pin 18) and stable DC output allow direct connection to op-amp integrators without signal conditioning, reducing component count and drift sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LVDT signal conditioning applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD598AD | Commercial-grade (–40°C to +85°C), ceramic DIP package, non-MIL-qualified; identical pinout and electrical specs except temp range and screening | Not suitable for aerospace or military platforms requiring extended temperature or MIL-STD-883B conformance | Select AD598AD only for cost-sensitive industrial applications within commercial temperature envelope. |
| AD698AP | Second-generation LVDT conditioner with improved PSRR (15 ppm/V), lower noise, and integrated reference; 24-pin SOIC package, not pin-compatible | Requires PCB redesign; offers higher resolution but lacks MIL-STD-883B qualification and hermetic packaging | Choose AD698AP when upgrading legacy designs for better noise performance and no MIL requirement. |
Compared with AD598AD and AD698AP, AD598SD/883B uniquely delivers MIL-STD-883B qualification, hermetic ceramic packaging, and proven field reliability in safety-critical motion feedback - making it irreplaceable where environmental ruggedness and certification traceability are mandatory.
Availability
AD598SD/883B is available at Aetrix Electronics and suitable for aerospace actuation, nuclear instrumentation, industrial load cells, and high-reliability servo systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD598SD/883B 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD598 product line was designed specifically for high-accuracy, maintenance-free LVDT/RVDT interfacing in mission-critical environments - emphasizing ratiometric stability, wide temperature operation, and minimal external component count.
FAQ
What is the maximum LVDT cable length supported by the AD598SD/883B?
The AD598SD/883B can drive an LVDT located up to 300 feet away without degradation in accuracy. Its ratiometric architecture eliminates sensitivity to phase shift and signal attenuation in long cables. This capability is verified across the full –55°C to +125°C operating range and is integral to its MIL-STD-883B qualification. For optimal noise immunity, twisted-pair shielded cable is recommended for both excitation and secondary signal paths in the AD598SD/883B design.
Does the AD598SD/883B require external trimming or calibration during production?
No, the AD598SD/883B requires no adjustments or null calibration. Its ratiometric decoding architecture inherently rejects transducer null voltage, primary-to-secondary phase shifts, and excitation amplitude variations. All specifications - including 0.05% FS linearity and ±11 V output range - are guaranteed over temperature without user trimming. External components (R2, C1, C2–C4) set scaling and bandwidth but do not require tuning for basic operation of the AD598SD/883B.
Can the AD598SD/883B be used with RVDTs, and how does configuration differ from LVDT mode?
Yes, the AD598SD/883B is explicitly specified for RVDT interfacing. Configuration is identical to LVDT mode: VA and VB connect to the two RVDT secondary windings, and the same transfer function VOUT = 500 µA × R2 × (VA – VB)/(VA + VB) applies. No circuit changes or parameter reselection are needed. The AD598SD/883B's insensitivity to phase shift and amplitude ratio makes it equally effective for rotary position sensing, as confirmed in Analog Devices' product highlights and application notes.
What is the purpose of the FEEDBACK pin (Pin 18) on the AD598SD/883B?
Pin 18 (FEEDBACK) provides access to the internal integrator node used in the ratiometric decoder loop. It enables direct connection to external op-amps for servo loop integration - allowing the AD598SD/883B to function as a position-to-velocity converter in closed-loop electromechanical systems. This feature is documented in the "Loop Integrator" product highlight and Figure 6 of the AD598SD/883B datasheet, and is electrically identical across all AD598 variants including AD598SD/883B.
How is the excitation frequency set on the AD598SD/883B, and what capacitor value yields 400 Hz?
The excitation frequency is set by a single external capacitor C1 connected between Pins 6 and 7 (FREQ1/FREQ2). The relationship is C1 (µF) = 35 / fEXC (Hz). For 400 Hz, C1 = 35 / 400 = 0.0875 µF - a standard 0.082 µF or 0.1 µF capacitor is typically used, yielding ~427 Hz or ~350 Hz respectively. This method is specified in the AD598SD/883B design procedure and validated across the full temperature range per MIL-STD-883B testing.
AD598SD/883B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Signal Conditioner
- Input Type:
- -
- Output Type:
- -
- Current - Supply:
- 18 mA
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-CDIP
AD598SD/883B FAQ
1.How can I place an order for AD598SD/883B through Aetrix?
Please submit a Request for Quotation (RFQ) for AD598SD/883B 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 AD598SD/883B reliable?
The price and inventory of AD598SD/883B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD598SD/883B is usually 5 days.
3.What payment methods are accepted for AD598SD/883B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD598SD/883B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD598SD/883B?
AD598SD/883B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD598SD/883B 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 AD598SD/883B?
For technical support, including AD598SD/883B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD598SD/883B requirements.
6.How does Aetrix verify that AD598SD/883B is sourced from the original manufacturer or authorized distributors?
All AD598SD/883B 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 AD598SD/883B meets industry standards.
7.What is the process for return or replacement of AD598SD/883B?
All AD598SD/883B units undergo pre-shipment inspection (PSI). If there is an issue with AD598SD/883B, 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 AD598SD/883B part is unused and in its original packaging.
Return procedure for AD598SD/883B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD598SD/883B Tags
-
RE46C100S8TF
Microchip Technology
-
XTR111AIDRCR
Texas Instruments
-
XTR111AIDGQR
Texas Instruments
-
XTR117AIDGKR
Texas Instruments
-
XTR111AIDGQT
Texas Instruments
-
XTR115UA/2K5
Texas Instruments
-
MAX14626ETT+T
Analog Devices Inc./Maxim Integrated
-
XTR116UA/2K5
Texas Instruments
-
XTR115U/2K5
Texas Instruments
-
XTR116U/2K5
Texas Instruments
-
PGA308AIDGSR
Texas Instruments
-
XTR300AIRGWR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
