ADADC85S-12/883B - 12-Bit SAR ADC, MIL-STD-883 | Analog Devices
Teilenummer: ADADC85S-12/883B ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $285 | $285,00 |
| 10 | $256.5 | $2.565,00 |
| 100 | $230 | $23.000,00 |
| 500 | $198 | $99.000,00 |
| 1.000 | $175 | $175.000,00 |
ADADC85S-12/883B Übersicht
A successive-approximation ADC is a converter topology that uses an internal binary search algorithm, comparing the input voltage against a precision reference once per bit per clock cycle. Compared to flash ADCs (which use 2^N parallel comparators), SAR ADCs deliver higher resolution at lower power with no pipeline latency, making them well suited to multiplexed data acquisition systems, instrumentation, and process control loops where the ADC must settle to full resolution before the next channel is selected.
Key features of the ADADC85S-12/883B include monolithic 12-bit feedback DAC architecture, internal buried-zener reference, and internal clock oscillator. The hybrid IC design combines MSI digital and linear monolithic chips with a 12-bit monolithic DAC to deliver modular performance and reliability in a single hermetic package. The device is processed to MIL-STD-883, Class B requirements, making it suitable for high-reliability military and aerospace systems. Operating from ±15 V and +5 V supplies, the part includes three-state output buffers for direct interface to microprocessor data buses.
The ADADC85S-12/883B uses a hybrid construction that mounts a 12-bit monolithic feedback DAC, MSI digital logic, and precision linear circuitry on a single ceramic substrate, then hermetically seals the assembly in a 32-pin side-brazed ceramic DIP. The buried-zener reference (rather than a bandgap) yields low temperature drift and low noise, key for instrumentation and process-control front ends.
Typical applications include military and aerospace data acquisition systems, process control front ends, precision instrumentation, military radar systems, and avionics sensor read-out. The wide supply range (±15 V analog, +5 V digital) simplifies power-tree design in retro and new-build avionics.
A key design tip when laying out a board for the ADADC85S-12/883B: keep analog and digital grounds separated and join them only at the ADC ground pin, because the hybrid module has long internal bond wires and the high-speed digital output transitions can couple into the analog reference if grounds are not managed carefully.
This page synthesizes distributor pricing, MIL-STD-883B screening information, drop-in alternatives, and comparison data not consolidated in any single manufacturer or distributor source.
Drop-in-Alternativen für ADADC85S-12/883B – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit ADADC85S-12/883B (gleiche Bauform und Footprint) – abweichend in Architecture, Mounting Type, Package.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
ADADC85S-12
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ADADC85-12/883B
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ADADC84S-12/883B
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ADCH-12B1
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ADADC85S-12/883B Grenzwerte & elektrische Eigenschaften
| Auflösung | 12 bits |
| Converter Type | SAR (Successive Approximation) |
| Number of Channels | 1 |
| Output Interface | Parallel, 12-bit |
| Internal Reference | Yes (buried-zener) |
| Internal Clock | Yes |
| Internal Comparator | Yes |
| Gehäuse | 32-pin SBCDIP (Side-Brazed Ceramic DIP) |
| Anzahl der Pins | 32 |
| Montageart | Through-Hole |
| Military Screening | MIL-STD-883, Class B |
| Architecture | Hybrid IC (MSI + monolithic DAC + linear) |
| Analog Supply Voltage | ±15 V |
| Digital Supply Voltage | +5 V |
ADADC85S-12/883B Pin-Konfiguration
| Pin 1 | ANALOG INPUT — Analog signal input to the SAR ADC |
| Pin 2 | NC — Not connected (per datasheet) |
| Pin 3 | NC — Not connected (per datasheet) |
| Pin 4 | REF OUT — Internal reference output (buried-zener) |
| Pin 5 | REF ADJ — Reference adjustment / trim |
| Pin 6 | NC — Not connected (per datasheet) |
| Pin 7 | -15V — Negative analog supply (-15 V) |
| Pin 8 | GND — Analog/digital ground |
| Pin 9 | +15V — Positive analog supply (+15 V) |
| Pin 10 | +5V — Digital supply (+5 V) |
| Pin 11 | BIT 12 LSB — Parallel data bit 12 (LSB, with sign encoding) |
| Pin 12 | BIT 1 — Parallel data bit 1 (LSB family) |
| Pin 13 | BIT 2 — Parallel data bit 2 |
| Pin 14 | BIT 3 — Parallel data bit 3 |
| Pin 15 | BIT 4 — Parallel data bit 4 |
| Pin 16 | BIT 5 — Parallel data bit 5 |
| Pin 17 | BIT 6 — Parallel data bit 6 |
| Pin 18 | BIT 7 — Parallel data bit 7 |
| Pin 19 | BIT 8 — Parallel data bit 8 |
| Pin 20 | BIT 9 — Parallel data bit 9 |
| Pin 21 | BIT 10 — Parallel data bit 10 |
| Pin 22 | BIT 11 MSB — Parallel data bit 11 (MSB) |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | STATUS — Conversion status output |
| Pin 25 | CS — Chip select / strobe input |
| Pin 26 | CONVERT — Convert / start-of-conversion input |
| Pin 27 | NC — Not connected (per datasheet) |
| Pin 28 | NC — Not connected (per datasheet) |
| Pin 29 | GND — Digital ground return |
| Pin 30 | GND — Digital ground return |
| Pin 31 | GND — Digital ground return |
| Pin 32 | GND — Digital ground return |
Typische Anwendungen
ADADC85S-12/883B ist geeignet für 6 Anwendungs: Military Data Acquisition Systems, Process Control Front Ends, Aerospace Avionics Sensor Readout, Precision Instrumentation, Military Radar and Sonar Signal Chains, Ground Station Telemetry Receiver Cards.
Military Data Acquisition Systems
The ADADC85S-12/883B's MIL-STD-883 Class B screening and hermetic 32-pin SBCDIP package make it a direct fit for tactical military data-acquisition front ends. According to the Analog Devices datasheet, the part integrates reference, clock, and comparator on-chip, reducing bill-of-materials count and PCB area in defense electronics where board real estate is constrained. Its 12-bit resolution and parallel output simplify interface to MIL-STD-1553 or backplane FPGA designs. Designers typically place the ADC close to the analog input connector with a separate analog ground plane and stitch the analog/digital ground only at the ADC ground pin, because the hybrid module's bond wires can couple digital switching noise into the analog reference if grounds are mishandled.
Empfohlen
Process Control Front Ends
For industrial process-control and SCADA front ends, the ADADC85S-12/883B delivers 12-bit resolution with an internal buried-zener reference that simplifies the bill of materials to the ADC plus decoupling. According to the Analog Devices ADADC85 datasheet, the internal reference provides up to 1 mA to external loads, removing the need for an external reference buffer and allowing the ADC to drive long backplane or multiplexer loads directly. Operating from ±15 V and +5 V supplies, the part plugs easily into existing 4-20 mA loop and RTD front-end designs. Designers should add a 100 ns sample-and-hold upstream when the input signal slew exceeds the ADC tracking rate, otherwise the SAR architecture will alias fast transients across multiple channels.
Empfohlen
Aerospace Avionics Sensor Readout
In avionics sensor-readout subsystems the ADADC85S-12/883B provides MIL-STD-883 Class B reliability in a single hermetic package that survives the temperature, vibration, and humidity profiles of DO-160 and MIL-STD-810 environments. The 12-bit resolution suits altimeter, air-data, and inertial sensor readout where the dynamic range is well below 14 bits but absolute accuracy over the full military temperature range is non-negotiable. With hybrid IC construction and internal clock, the part eliminates the most common field-failure modes of multi-chip discrete ADC designs. Avionics designers typically derate the device to 70% of absolute-maximum ratings and add a redundant watchdog ADC for fault detection, which is a regulatory expectation for DO-178C systems.
Empfohlen
Precision Instrumentation
Test-and-measurement instrumentation bench equipment often requires a hermetic, fully screened ADC for traceability and calibration stability, and the ADADC85S-12/883B fills that niche. According to the Analog Devices datasheet, the internal buried-zener reference and hybrid construction give excellent long-term stability over temperature, which is essential for laboratory multimeters, signal calibrators, and acoustic analyzers where the ADC accuracy sets the instrument's published spec. Designers should pair the ADC with a low-noise input amplifier (e.g., AD620) and use a precision resistor network for gain calibration stored in EEPROM, so end-of-line cal can correct for any residual gain error at room temperature. The part's legacy status makes it a familiar choice for instrument retrofit programs.
Empfohlen
Military Radar and Sonar Signal Chains
Radar and sonar preprocessing chains feed downrange signals to a SAR ADC, and the ADADC85S-12/883B's MIL-STD-883 Class B screening plus 12-bit resolution plus parallel output make it a strong fit for legacy beam-forming front ends. The internal reference and clock reduce board complexity in dense RF-to-digital subsystems, while the hermetic SBCDIP package tolerates the temperature and shock environment of shipboard and airborne mounts. Designers typically place the ADC immediately after the IF amplifier and ahead of the FPGA-based digital beam-former, with a sample-and-hold amplifier upstream when the IF exceeds a few hundred kilohertz. The 32-pin SBCDIP footprint also allows the part to fit inside existing MIL-spec chassis used by retro programs.
Empfohlen
Ground Station Telemetry Receiver Cards
Telemetry receivers for ground stations and unmanned systems need MIL-grade data conversion, and the ADADC85S-12/883B provides 12-bit resolution in a screened hermetic package qualified for harsh field conditions. The parallel 12-bit output streams data directly into FPGA or microcontroller buffers without an external reference or clock circuit, reducing the receiver card's BOM and PCB area. According to the Analog Devices ADADC85 datasheet, the hybrid IC architecture keeps latency low and deterministic, so designers do not need to compensate for SAR state-machine skew when time-stamping decoded packets. The 32-pin SBCDIP through-hole package is also friendly to hand-rework and field replacement where rework stations use conventional soldering irons.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ADADC85S-12/883B – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ADADC85S-12 | ADADC85-12/883B | ADADC84S-12/883B | ADCH-12B1 | AD1674BR |
|---|---|---|---|---|---|---|
| Package | 32-pin SBCDIP (Side-Brazed Ceramic DIP) | 32-pin SBCDIP - same | 32-pin SBCDIP - same | 32-pin SBCDIP - same | 32-pin SBCDIP - same | 28-pin CDIP - different |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Architecture | SAR (Successive Approximation) | SAR | SAR | SAR | SAR | SAR |
| Internal Reference | Yes (buried-zener) | Yes | Yes | Yes | Yes | Internal reference |
| Internal Clock | Yes | Yes | Yes | Yes | Yes | Internal clock |
| Output Interface | Parallel, 12-bit | Parallel, 12-bit | Parallel, 12-bit | Parallel, 12-bit | Parallel, 12-bit | Parallel, 12-bit |
| Military Screening | MIL-STD-883, Class B | Commercial grade - NO MIL | MIL-STD-883 Class B - same | MIL-STD-883 Class B - same | Industrial screening | Hermetic package, varies by suffix |
| Analog Supply | ±15 V | ±15 V | ±15 V | ±15 V | ±15 V | +5 V / ±12 V / ±15 V options |
Wichtigste Unterscheidungsmerkmale
- MIL-STD-883 Class B screening on a 12-bit hybrid SAR ADC (vs. ADADC85S-12 (commercial grade))
- Fully integrated SAR ADC with internal reference, clock, and comparator (vs. Discretely-assembled SAR ADC reference designs)
- 32-pin SBCDIP hermetic package (vs. Plastic DIP or SOIC ADC alternatives)
- Internal buried-zener reference (vs. External bandgap reference designs)
Designhinweise
Place the ADADC85S-12/883B as close as possible to the analog input connector with a low-impedance analog ground plane dedicated to the ADC footprint. Long traces between the analog input and the ADC increase the chance of noise pickup, especially in military and aerospace environments where radiated EMI is non-negligible. Keep analog and digital ground regions separated and join them only at the ADC ground pin (pin 8 of 32 in the SBCDIP package) to prevent digital switching noise from coupling into the internal buried-zener reference.
The 32-pin SBCDIP side-brazed ceramic package has significantly lower thermal resistance than a plastic DIP but still requires some thermal de-rating at high ambient temperatures. Estimated: in still air with no heatsink, the junction-to-ambient thermal resistance is approximately 50 C/W, so dissipating 1 W causes a 50 C junction temperature rise. For military-grade applications operating at 100 C ambient, ensure total power dissipation stays below 500 mW to keep junction temperature below 150 C.
Do not apply signal or power with the supply rails sequenced incorrectly; the ±15 V supplies must be present before or simultaneously with the +5 V digital supply. Reversing the supply polarity can permanently damage the internal hybrid bond wires, and the MIL-STD-883 screening does not include polarity-reversal protection. Add a low-leakage diode on each supply rail if the power tree is uncertain, especially in field-replaceable modules. Also avoid operating the ADC below the minimum conversion rate, because the SAR architecture relies on the internal clock oscillator settling once per conversion.
The ADADC85S-12/883B draws approximately +5 V and ±15 V supplies and can produce logic-level output transients when the parallel data bus toggles. Decouple each supply pin with at least 0.1 uF ceramic plus 10 uF tantalum within 5 mm of the package, and place bulk decoupling on the rail entry of the PCB. Designers should monitor the +5 V digital current with a series resistor or current-sense circuit to detect latch-up or shoot-through, especially during high-temperature hot-soak testing.
Compliance-Informationen
MIL-STD-883 Class B screening is explicitly indicated by the /883B suffix. Specific RoHS, REACH, lead-free, halogen-free, and conflict-minerals compliance for the ADADC85S-12/883B were not explicitly stated in the verified web data summary; consult Analog Devices directly for the latest compliance documentation.
