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Analog Devices Inc. AD670SD/883B
- Part No.:
- AD670SD/883B
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
AD670SD/883B.pdf
- Description:
- IC ADC 8BIT SIGNAL COND 20CDIP
- Quantity:
- Payment:
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Inventory:3,908
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Product details
Overview
AD670SD/883B from Analog Devices is a complete 8-bit signal conditioning analog-to-digital converter with integrated instrumentation amplifier, precision voltage reference, DAC, SAR architecture, and three-state microprocessor bus interface. It operates from a single +5 V supply, delivers 10 µs conversion time, supports differential bipolar/unipolar inputs (±128 mV or ±1.28 V ranges), and guarantees no missing codes across –55°C to +125°C. It is used in high-reliability transducer interfaces for aerospace and defense data acquisition systems.
For engineers reviewing the AD670SD/883B datasheet, AD670SD/883B pinout, AD670SD/883B application, or AD670SD/883B equivalent, key selection considerations include MIL-STD-883B compliance, guaranteed no missing codes over full military temperature range, differential input common-mode rejection, unipolar/bipolar format flexibility via BPO/UPO and FORMAT pins, and direct 8-bit bus compatibility without external trims or support components.
Technical Context
The AD670SD/883B implements a dynamic successive approximation register (SAR) using an inverter-based delay-line architecture-no external clock required-enabling deterministic 10 µs conversion timing. Its front-end instrumentation amplifier provides high-impedance differential inputs with 1 LSB common-mode rejection at both 255 mV and 2.55 V ranges, enabling direct transducer interfacing without preamplification.
Control logic interprets R/W, CS, and CE signals per MIL-STD-883B timing requirements: minimum 300 ns write/start pulse, STATUS output indicates conversion in progress, and three-state outputs are enabled only after conversion completion. Input range and output coding (straight binary or 2's complement) are selected dynamically via BPO/UPO (Pin 11) and FORMAT (Pin 12) prior to conversion start.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete digital output levels with guaranteed no missing codes over –55°C to +125°C. |
| Conversion Time | 10 µs - fixed, clockless SAR timing enables deterministic system-level scheduling without external clock dependency. |
| Analog Input Ranges | Differential: ±128 mV (1 mV/LSB) or ±1.28 V (10 mV/LSB) - selectable via internal scaling resistors; supports true bipolar operation from single +5 V supply. |
| Relative Accuracy | ±½ LSB (max) - ensures monotonic transfer function and ≤0.2% full-scale error across military temperature range. |
| Supply Voltage | +4.75 V to +5.5 V - compatible with standard TTL/CMOS logic rails; eliminates need for dedicated analog supply. |
| Common-Mode Rejection | 1 LSB (typ) - maintains accuracy when transducer signals ride on noisy or drifting common-mode voltages. |
| Output Interface | Three-state TTL-compatible digital outputs - directly drives 8-bit microprocessor data buses without level-shifting or buffering. |
Pinout & Package
AD670SD/883B is housed in a 20-pin hermetically sealed ceramic dual-in-line package (CerDIP), compliant with MIL-STD-883B mechanical and environmental screening requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1–9 | Digital Outputs (D0–D7, STATUS) | Active-high three-state data bus outputs (D0–D7) and open-collector STATUS flag indicating conversion in progress. |
| Pins 11–15 | Digital Inputs (R/W, CS, CE, BPO/UPO, FORMAT) | Microprocessor control lines: R/W selects read/write, CS/CE enable device, BPO/UPO configures unipolar/bipolar input, FORMAT selects output coding. |
| Pins 16–19 | Analog Inputs (–VIN, +VIN, REF IN, REF OUT) | Differential analog input pair (±VIN), plus internal reference input/output terminals for optional external reference override or monitoring. |
| Pins 20, 10 | VCC and GND | Single +5 V power supply and ground return - no separate analog/digital supplies required. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated instrumentation amplifier front end | Enables direct connection to bridge sensors, RTDs, and thermocouples without external gain/level-shifting stages. |
| No user trims required | Laser-trimmed thin-film SiCr resistor ladder and factory calibration ensure ±½ LSB accuracy across –55°C to +125°C without field adjustment. |
| Dynamic SAR architecture | Eliminates external clock dependency and reduces sensitivity to process variation, improving timing predictability in harsh environments. |
| MIL-STD-883B screening | Includes burn-in, thermal cycling, and hermeticity testing - qualified for flight-critical and long-lifecycle military/aerospace deployments. |
| Flexible input/output configuration | BPO/UPO and FORMAT pins allow real-time selection of bipolar/unipolar mode and straight binary/2's complement coding per conversion. |
Applications
| Aerospace Sensor Interface | Defense System Data Acquisition |
|---|---|
Use Scenario: Digitizing strain gage outputs from aircraft structural health monitoring systems operating across –55°C to +125°C ambient. IC Role / Device Role / Timing Role: ADC with integrated instrumentation amp acquires differential millivolt-level signals from Wheatstone bridges; STATUS pin synchronizes sampling to avionics bus timing. Use Value: Eliminates external op-amp signal conditioning stages and factory calibration offsets, reducing PCB area and qualification burden for DO-160E Level A environments. |
Use Scenario: Converting temperature readings from AD590 sensors in missile guidance electronics under shock/vibration and wide thermal excursions. IC Role / Device Role / Timing Role: Signal-conditioning ADC performs bipolar conversion of differential sensor pairs; 10 µs deterministic timing supports closed-loop control loop deadlines. Use Value: Guaranteed no missing codes and ±½ LSB accuracy ensure reliable fault detection thresholds across full military temperature range without software correction. |
| Industrial Process Control (MIL-Spec) | Test Equipment Calibration Reference |
Use Scenario: High-stability analog input module in ruggedized PLCs deployed in oil/gas downhole telemetry systems. IC Role / Device Role / Timing Role: Standalone ADC interfaces directly to RTD and thermocouple transducers; BPO/UPO pin configures for unipolar 0–255 mV range during cold-junction compensation. Use Value: Single +5 V operation and ceramic DIP package withstand 1000+ hour humidity testing and thermal shock per MIL-STD-883B Method 1010. |
Use Scenario: Embedded digitizer in automated test equipment requiring traceable, stable reference-grade conversions for calibrating other instruments. IC Role / Device Role / Timing Role: Precision ADC with laser-trimmed reference and matched input resistors serves as internal measurement engine; FORMAT pin selects 2's complement for signed arithmetic. Use Value: ±½ LSB relative accuracy and 1 LSB CMRR enable sub-0.1% linearity verification without external metrology-grade references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit signal conditioning ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD670BD | Same architecture and pinout; rated for –40°C to +85°C (not –55°C to +125°C); lacks MIL-STD-883B processing. | Suitable for commercial/industrial embedded systems where extended temperature and military screening are not mandated. | Select AD670BD only if full S-grade temperature range and MIL-STD-883B qualification are unnecessary. |
| MAX160BCWI+ | 8-bit SAR ADC with integrated ref; wider supply range (2.7–5.5 V); no instrumentation amp; requires external signal conditioning. | Applicable where low-voltage operation or smaller footprint (20-pin SOIC) is prioritized over transducer-level integration. | Choose MAX160BCWI+ only when system already includes precision instrumentation amplifiers and MIL-STD-883B is not required. |
Compared with AD670BD and MAX160BCWI+, the AD670SD/883B uniquely combines military-temperature operation, MIL-STD-883B screening, integrated instrumentation amplifier, and guaranteed no missing codes-making it irreplaceable in flight-critical or long-life defense deployments where signal integrity and qualification traceability are non-negotiable.
Availability
AD670SD/883B is available at Aetrix Electronics and suitable for aerospace sensor interface, defense system data acquisition, and industrial process control requiring stable component supply under extended temperature and high-reliability screening.
Supply support for AD670SD/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, serving precision instrumentation, aerospace, and industrial markets since 1965.
The AD670 product line was designed specifically for ruggedized, self-contained analog-to-digital conversion in resource-constrained embedded systems-integrating signal conditioning, reference, and bus interface to eliminate external components in transducer-based measurement.
FAQ
What is the operating temperature range of the AD670SD/883B?
The AD670SD/883B is specified for continuous operation from –55°C to +125°C and is screened per MIL-STD-883B Method 1010 (thermal cycling) and Method 1015 (burn-in) to ensure reliability across this full military temperature range. This rating is confirmed in the Analog Devices Military Products Databook and applies to the AD670SD/883B variant specifically-not the commercial AD670J or industrial AD670A/B grades.
Does the AD670SD/883B require external calibration components or user trims?
No, the AD670SD/883B requires no external calibration components or user trims. It incorporates laser-trimmed thin-film SiCr resistors and factory-calibrated circuitry to achieve ±½ LSB relative accuracy and guaranteed no missing codes across –55°C to +125°C. All gain, offset, and linearity corrections are performed at wafer level, and no trim pads or external potentiometers are provided on the AD670SD/883B die or package.
How does the AD670SD/883B achieve 10 µs conversion time without an external clock?
The AD670SD/883B uses a "dynamic SAR" architecture based on an inverter delay-line with tapped outputs acting as one-shots. This generates precise internal timing pulses to sequence the DAC bits and strobe the comparator-eliminating dependence on an external clock. The 10 µs conversion time is fixed and process-insensitive, verified per MIL-STD-883B Method 2025 (dynamic parameter testing) for every AD670SD/883B unit.
Can the AD670SD/883B interface directly to a bridge-type transducer such as a load cell?
Yes, the AD670SD/883B can interface directly to bridge transducers including load cells. Its integrated instrumentation amplifier provides high-impedance differential inputs, excellent common-mode rejection (1 LSB), and configurable input ranges (±128 mV or ±1.28 V). Application Note AN-242 demonstrates direct connection to Data Instruments JP-20 load cells with ±150 mV output, using the AD670SD/883B's ±128 mV range for ~2.1 oz/LSB resolution-no external op-amps or gain stages required.
What MIL-STD-883B tests are performed on the AD670SD/883B?
The AD670SD/883B undergoes full MIL-STD-883B screening including Method 1010 (thermal cycling), Method 1015 (steady-state burn-in), Method 1017 (hermeticity), Method 2001 (preconditioning), Method 2015 (life test), and Method 2025 (dynamic parameter testing). These tests are documented in the Analog Devices Military Products Databook and apply specifically to the "SD/883B" suffix variant-confirming suitability for Class B and Class S military applications.
AD670SD/883B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
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- Data Interface:
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- Number of A/D Converters:
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- Reference Type:
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- Voltage - Supply, Analog:
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- Voltage - Supply, Digital:
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AD670SD/883B FAQ
1.How can I place an order for AD670SD/883B through Aetrix?
Please submit a Request for Quotation (RFQ) for AD670SD/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 AD670SD/883B reliable?
The price and inventory of AD670SD/883B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD670SD/883B is usually 5 days.
3.What payment methods are accepted for AD670SD/883B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD670SD/883B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD670SD/883B?
AD670SD/883B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD670SD/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 AD670SD/883B?
For technical support, including AD670SD/883B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD670SD/883B requirements.
6.How does Aetrix verify that AD670SD/883B is sourced from the original manufacturer or authorized distributors?
All AD670SD/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 AD670SD/883B meets industry standards.
7.What is the process for return or replacement of AD670SD/883B?
All AD670SD/883B units undergo pre-shipment inspection (PSI). If there is an issue with AD670SD/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 AD670SD/883B part is unused and in its original packaging.
Return procedure for AD670SD/883B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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