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Analog Devices Inc. AD1385TD
- Part No.:
- AD1385TD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD1385TD.pdf
- Description:
- 16-BIT 500 KHZ SAMPLING ADC
- Quantity:
- Payment:
- Shipping:
Inventory:3,865
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Product details
Overview
AD1385TD from Analog Devices is a 16-bit, 500 kHz sampling analog-to-digital converter (ADC) with differential linearity autocalibration, specified over the full military temperature range of –55°C to +125°C. It features ±5 V or ±10 V bipolar input ranges, 90 dB SNR at 100 kHz, –88 dB THD at 100 kHz, and 0.0015% FSR INL (max), enabling high-fidelity signal acquisition in radar and vibration analysis systems.
For engineers reviewing the AD1385TD datasheet, AD1385TD pinout, AD1385TD application, or AD1385TD equivalent, this page delivers verified technical context, military-grade thermal performance data, autocalibration timing (15 ms), dual input range selection logic, and precise power supply requirements (±5 V, ±15 V) critical for ruggedized embedded data acquisition design.
Technical Context
The AD1385TD implements a three-pass digitally corrected subranging ADC architecture with integrated track/hold, precision thin-film resistors, and a proprietary 18-bit reference DAC. Its autocalibration circuitry directly measures and corrects DAC linearity errors across temperature, eliminating DNL drift without affecting gain or offset.
It operates synchronously with an external 10 MHz clock, supports complementary offset binary or two's complement output coding, and separates analog signal path (VINA/VINB, T/H input/output) from digital interface (DATA STROBE, Hi/Lo BYTE SELECT, B1 SELECT) to minimize crosstalk-enabling stable 16-bit resolution under dynamic thermal stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees 156 µV LSB step size at ±5 V range for sub-LSB-level parametric measurement accuracy |
| Sampling Rate | 500 kHz - enables Nyquist-limited capture of signals up to 250 kHz without aliasing in real-time waveform recorders |
| INL (max) | ±0.0015% FSR - ensures monotonicity and <1 LSB error across full military temperature range (–55°C to +125°C) |
| SNR @100 kHz | 90 dB (min) - delivers >60,000:1 dynamic range for low-amplitude signal extraction in CAT/MRI front-ends |
| THD @100 kHz | –88 dB (min) - maintains spectral purity for harmonic-sensitive applications like magnetic resonance spectroscopy |
| Calibration Duration | 15 ms - allows on-demand linearity correction during system idle cycles without interrupting continuous acquisition |
| Power Supply | ±5 V (analog & power), ±15 V - four-rail operation isolates noise-sensitive analog core from digital switching transients |
Pinout & Package
The AD1385TD is housed in a 48-pin bottom-brazed ceramic DIP (DH-48A) package with hermetic sealing for extended reliability in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLOCK IN (Pin 1) | Master timing input | Accepts 2.5–10 MHz CMOS-level clock; aperture delay fixed at 7 ns-critical for jitter-sensitive radar IF sampling |
| VINA / VINB (Pins 30/31) | Differential analog inputs | Support ±5 V or ±10 V bipolar ranges via external pin strapping; lower THD in ±5 V mode, lower noise in ±10 V mode |
| HOLD COMMAND IN/OUT (Pins 22/19) | Track/hold control interface | Enables synchronous conversion when looped; Hold Command Out asserts 13×CP after Start Convert rising edge |
| DATA STROBE (Pin 15) | Output synchronization | Rising edge clocks first byte, falling edge clocks second byte-ensures deterministic 16-bit parallel read timing |
| B1 SELECT (Pin 44) | Data format control | Selects complementary offset binary (default) or complementary two's complement output coding |
| CAL / CAL STATUS (Pins 38/28) | Autocalibration interface | CAL pulse initiates 15 ms internal linearity correction; CAL STATUS goes high during calibration execution |
Key Features
| Feature | Design Value |
|---|---|
| Differential linearity autocalibration | Corrects DAC-based linearity drift in real time-eliminates need for external calibration hardware in field-deployed ATE systems |
| Three-pass subranging ADC architecture | Combines speed (500 kHz) and precision (16-bit) without requiring external dither or oversampling |
| Separate T/H input and output pins | Allows external signal conditioning between track/hold stages-essential for anti-alias filtering in wideband vibration analyzers |
| Internal 10 V reference (±0.01% initial accuracy) | Drift ≤15 ppm/°C-enables system-level gain error tracking without external reference buffers in portable diagnostic equipment |
| Four isolated power domains (±5 V, ±15 V) | Prevents digital switching noise from modulating analog signal path-verified by 90 dB SNR at 100 kHz under full thermal stress |
Applications
| Radar Signal Acquisition | Vibration Analysis System |
|---|---|
Use Scenario: Capturing intermediate-frequency (IF) pulses in ground-based surveillance radar with pulse repetition frequencies up to 500 kHz. IC Role / Device Role / Timing Role: Primary sampling ADC performing synchronized, jitter-controlled digitization of conditioned IF signals prior to FFT processing. Use Value: 90 dB SNR and –88 dB THD ensure detection of weak return echoes buried within clutter, while autocalibration maintains accuracy across desert-to-arctic operating temperatures. | Use Scenario: Real-time monitoring of bearing harmonics in industrial turbine gearboxes using accelerometers with ±10 V output swing. IC Role / Device Role / Timing Role: High-resolution data acquisition front-end converting analog vibration signatures into time-synchronized 16-bit samples for envelope demodulation. Use Value: ±0.0015% FSR INL prevents harmonic distortion masking in early fault detection; 15 ms autocalibration enables recalibration during scheduled maintenance windows. |
| Medical MRI Gradient Control | Parametric Measurement Unit (ATE) |
Use Scenario: Digitizing gradient coil feedback signals in open-bore MRI systems where EMI and thermal cycling degrade conventional ADC performance. IC Role / Device Role / Timing Role: Precision analog monitor channel acquiring gradient current/voltage waveforms at 500 kSPS for closed-loop correction. Use Value: Hermetic DH-48A package and –55°C to +125°C rating withstand MRI magnet fringe fields and cryo-cooler thermal gradients; internal reference eliminates external buffer drift. | Use Scenario: Automated test equipment validating semiconductor device parameters (e.g., leakage, threshold voltage) requiring traceable 16-bit DC accuracy over temperature. IC Role / Device Role / Timing Role: Metrology-grade ADC in calibration subsystem, capturing reference sensor outputs with guaranteed monotonicity and no missing codes. Use Value: Guaranteed no missing codes and 0.0006% FSR DNL (typ) ensure unambiguous pass/fail decisions across production lots; autocalibration supports NIST-traceable revalidation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD1385KD | Same architecture and pinout, but rated only from 0°C to +70°C; lacks military-grade thermal compensation and long-term drift specs | Suitable for commercial benchtop instruments; not qualified for airborne or vehicle-mounted deployments | Select AD1385KD only if ambient operating temperature remains strictly within 0°C–70°C and lifecycle calibration is performed externally |
| ADS8860 (TI) | 16-bit, 1 MSPS SAR ADC; single 3-V supply; no internal reference; requires external driver and reference; no autocalibration | Lower power (15 mW vs. 2.76 W), smaller QFN package; suited for battery-powered portable analyzers-not for high-dynamic-range radar or MRI | Choose ADS8860 when power budget and board space constrain design, and when system-level calibration can compensate for missing autocalibration |
Compared with AD1385KD, the AD1385TD adds guaranteed –55°C to +125°C operation and factory-tested linearity drift control; compared with ADS8860, it provides integrated reference, autocalibration, and multi-rail isolation-but at higher power and larger footprint.
Availability
AD1385TD is available at Aetrix Electronics and suitable for radar signal acquisition, vibration analysis systems, medical MRI gradient control, and parametric measurement units requiring stable component supply across extended temperature extremes.
Supply support for AD1385TD 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, serving aerospace, defense, industrial, and medical markets with precision data conversion and signal conditioning solutions.
The AD1385 product line was designed specifically for high-accuracy, high-speed data acquisition in thermally demanding environments-delivering guaranteed 16-bit linearity without external calibration hardware across military temperature ranges.
FAQ
What is the operating temperature range of the AD1385TD?
The AD1385TD is fully specified from –55°C to +125°C case temperature, with all key parameters-including INL, DNL, SNR, and THD-guaranteed across this full military temperature range. This rating is validated per MIL-STD-883 methods and distinguishes it from the commercial-grade AD1385KD variant.
How does the autocalibration function work in the AD1385TD?
The AD1385TD performs internal linearity calibration by measuring reference DAC errors using its own error amplifiers and flash ADC. It computes corrections for the 8 MSBs, stores them in internal RAM, and applies them via a correction DAC-completing the full cycle in 15 ms without external intervention or system downtime.
What power supplies are required for proper operation of the AD1385TD?
The AD1385TD requires four independent supply rails: +5 V and –5 V for analog and power domains respectively, plus +15 V and –15 V. Each rail must be bypassed with both 0.01 µF ceramic and 10 µF tantalum capacitors placed adjacent to their respective pins to suppress transient coupling and maintain SNR performance.
Can the AD1385TD operate with input ranges other than ±5 V and ±10 V?
No-the AD1385TD supports only two user-selectable bipolar input ranges: ±5 V and ±10 V, configured via external connection of VINA and VINB to the track/hold output and analog ground. No internal scaling or software-configurable ranges are provided; range selection is hardwired at PCB layout.
Is the AD1385TD pin-compatible with any other Analog Devices ADCs?
Yes-the AD1385TD shares near-identical pinout with the AD1382, differing only by two additional pins (CAL and CAL STATUS) that enable autocalibration. This allows straightforward hardware upgrades from AD1382-based systems to extend temperature range and linearity performance without PCB redesign.
AD1385TD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- AD1385
- Package/Case:
- 48-CDIP (0.600", 15.24mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Flash
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 14.25V ~ 15.75V, ±4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 14.25V ~ 15.75V, ±4.75V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -55°C ~ 125°C
- Supplier Device Package:
- 48-SBDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD1385TD FAQ
1.How can I place an order for AD1385TD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1385TD 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 AD1385TD reliable?
The price and inventory of AD1385TD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1385TD is usually 5 days.
3.What payment methods are accepted for AD1385TD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1385TD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1385TD?
AD1385TD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1385TD 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 AD1385TD?
For technical support, including AD1385TD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1385TD requirements.
6.How does Aetrix verify that AD1385TD is sourced from the original manufacturer or authorized distributors?
All AD1385TD 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 AD1385TD meets industry standards.
7.What is the process for return or replacement of AD1385TD?
All AD1385TD units undergo pre-shipment inspection (PSI). If there is an issue with AD1385TD, 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 AD1385TD part is unused and in its original packaging.
Return procedure for AD1385TD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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