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Analog Devices Inc. AD670SD
- Part No.:
- AD670SD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD670SD.pdf
- Description:
- 8-BIT SAR ADC, 2 CHANNEL
- Quantity:
- Payment:
- Shipping:
Inventory:738
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Product details
Overview
AD670SD from Analog Devices is a complete 8-bit signal conditioning analog-to-digital converter with integrated instrumentation amplifier front end, precision voltage reference, successive approximation register (SAR), DAC, comparator, and three-state digital output buffer - all on a single monolithic chip. 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 requires no external components or user trims for full accuracy. It is used in high-reliability transducer interface applications such as aerospace-grade temperature and strain gage measurement.
For engineers reviewing the AD670SD datasheet, AD670SD pinout, AD670SD application, or AD670SD equivalent, key selection considerations include its MIL-qualified ceramic DIP package, –55°C to +125°C operating range, guaranteed no missing codes over temperature, ±1/2 LSB relative accuracy at +25°C, and flexible input scaling with software-selectable output coding (2's complement or offset binary).
Technical Context
The AD670SD implements a dynamic successive approximation architecture using an I²L-based SAR without an external clock - timing is governed by internal delay-line one-shots that sequence bits MSB-to-LSB. Its instrumentation amplifier front end provides high common-mode rejection (1 LSB CMRR) and enables direct connection to floating transducers via differential inputs with built-in bias current return paths.
Control logic responds to R/W, CS, and CE signals for microprocessor bus interfacing: a 300 ns minimum pulse on CS or CE initiates conversion, STATUS goes high during conversion, and data becomes valid within 250 ns after R/W goes high in read mode. Output buffers are three-state and disabled during conversion to prevent bus contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers discrete digital output representing analog input with 256 distinct levels. |
| Conversion Time | 10 µs - enables up to 100 kSPS sampling rate in burst or continuous modes. |
| Input Ranges | Differential: 0–255 mV (1 mV/LSB) or 0–2.55 V (10 mV/LSB); bipolar options ±128 mV or ±1.28 V - selectable via BPO/UPO pin. |
| Relative Accuracy | ±1/2 LSB at +25°C - ensures monotonic transfer function and no missing codes across full temperature range. |
| Supply Voltage | +4.75 V to +5.5 V - compatible with standard 5 V logic rails and eliminates need for auxiliary supplies. |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial, avionics, and military environments per MIL-STD-883B. |
| Output Interface | Three-state TTL-compatible digital outputs - directly connects to 8-bit microprocessor data buses without level-shifting. |
Pinout & Package
AD670SD is housed in a 20-pin hermetically sealed ceramic dual in-line package (CerDIP, package option D-20), rated for high-reliability operation in harsh thermal and mechanical environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1–9 | Digital Outputs (D0–D7, STATUS) | Three-state TTL outputs delivering 8-bit conversion result and end-of-conversion flag; STATUS high = conversion active. |
| Pins 11–15 | Digital Inputs (R/W, CS, CE, FORMAT, BPO/UPO) | Microprocessor control lines: R/W selects read/write, CS/CE enable device, FORMAT selects output coding, BPO/UPO selects unipolar/bipolar mode. |
| Pins 16–19 | Analog Inputs (±VIN) | Differential instrumentation amp inputs supporting ±30 V absolute max; require DC return path for bias current. |
| Pin 20 | VCC | +5 V power supply input - powers entire signal chain including reference, SAR, and output buffers. |
| Pin 10 | GND | Analog/digital common ground reference - shared return for all circuitry; no separate AGND/DGND required. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated instrumentation amplifier front end | Enables direct transducer interfacing without external preamplification or gain-setting resistors - reduces BOM count and layout sensitivity. |
| Factory-calibrated zero and gain | Eliminates need for user trim pots or calibration routines - simplifies production test and field maintenance. |
| Software-selectable input/output configuration | BPO/UPO and FORMAT pins allow runtime selection of bipolar/unipolar input and 2's complement/offset binary output - increases system flexibility without hardware changes. |
| No missing codes over temperature | Guaranteed monotonicity from –55°C to +125°C - critical for closed-loop control and safety-critical monitoring systems. |
| MIL-STD-883B compliant construction | Hermetic ceramic DIP package with screening per Method 5005 - meets reliability requirements for defense and space applications. |
Applications
| Temperature Transducer Interface | Strain Gage Bridge Readout |
|---|---|
Use Scenario: Direct digitization of AD590 current-output temperature sensor configured for 0°C–255°C range using internal ±128 mV bipolar span. IC Role / Device Role / Timing Role: ADC with integrated instrumentation amp performs voltage conversion, scaling, and digitization - replaces discrete op amp + ADC solution. Use Value: Achieves 1°C resolution with no external gain/offset components and guaranteed linearity over full military temperature range. | Use Scenario: Reading low-level differential voltage from a Wheatstone bridge strain gage under vibration and thermal stress in structural health monitoring. IC Role / Device Role / Timing Role: Signal-conditioning ADC acquires bridge output while rejecting common-mode noise from motor drives or switching power supplies. Use Value: Delivers >80 dB CMRR at DC and low frequencies, enabling accurate microvolt-level measurements without shielded cabling or guard traces. |
| RTD-Based Process Control | Differential Temperature Monitoring |
Use Scenario: Platinum RTD (100 Ω @ 0°C) excited with constant 2.5 mA current; output measured differentially against fixed offset to yield 1 mV/°C signal. IC Role / Device Role / Timing Role: Precision ADC with programmable input range converts RTD voltage to digital value for PID loop feedback. Use Value: Full-scale match of ±1/2 LSB between + and – inputs ensures accurate differential measurement without calibration drift over temperature. | Use Scenario: Simultaneous measurement of two AD590 sensors - one at reference location, one at remote point - to compute localized temperature delta. IC Role / Device Role / Timing Role: Dual-sensor interface ADC providing matched gain/offset tracking across channels via shared internal reference and amplifier. Use Value: Enables <±0.5°C differential accuracy without channel-to-channel calibration, leveraging internal resistor ladder trimming and laser-wafer calibration. |
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 instead of –55°C to +125°C; uses same ceramic DIP package but lower temperature screening. | Suitable for commercial/industrial embedded systems where extended cold-start capability is not required. | Select AD670BD when full military temperature range is unnecessary and cost optimization is prioritized. |
| AD7810BRUZ | 10-bit SAR ADC with serial SPI interface; no integrated instrumentation amp; requires external signal conditioning; 2.7–5.5 V supply; 2.5 µs conversion time. | Used in space-constrained designs requiring higher resolution and lower power, but lacks direct transducer interface capability. | Choose AD7810BRUZ only if higher resolution and serial interface outweigh loss of integrated front-end functionality. |
Compared with AD670BD and AD7810BRUZ, the AD670SD uniquely combines military-grade temperature operation, integrated instrumentation amplification, and parallel 8-bit bus interface - making it irreplaceable in legacy avionics and ruggedized data acquisition where minimal component count and guaranteed monotonicity are mandatory.
Availability
AD670SD is available at Aetrix Electronics and suitable for aerospace instrumentation, defense subsystems, and high-reliability industrial process control requiring stable component supply across extended temperature extremes and long product lifecycles.
Supply support for AD670SD 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, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The AD670 product line was designed specifically for transducer interface applications demanding integrated signal conditioning, microprocessor compatibility, and operation in extreme environmental conditions - eliminating external amplifiers, references, and calibration components.
FAQ
What is the operating temperature range specified for the AD670SD?
The AD670SD is specified for operation from –55°C to +125°C and is screened to MIL-STD-883B standards. This extended range is achieved through hermetic ceramic DIP packaging and process controls validated across thermal cycling, shock, and vibration - making AD670SD suitable for deployment in jet engine monitoring, satellite payload telemetry, and downhole oilfield equipment where ambient conditions exceed commercial grade limits.
Does the AD670SD require external components for basic operation?
No, the AD670SD requires no external components for full 8-bit accuracy. Its monolithic integration includes an instrumentation amplifier, precision voltage reference, DAC, SAR logic, comparator, and three-state output buffers. Only decoupling capacitors (recommended 0.1 µF ceramic near VCC/GND) and proper grounding are needed - eliminating external gain-setting resistors, trim pots, or reference ICs required by discrete ADC solutions.
How does the AD670SD handle bipolar input signals with a single +5 V supply?
The AD670SD uses a specialized instrumentation amplifier front end that allows true bipolar input operation (e.g., ±128 mV or ±1.28 V) from a single +5 V supply. Internal circuitry injects a bipolar offset current equal to the MSB minus 1/2 LSB into the comparator summing node, enabling negative input voltages relative to ground without requiring dual supplies or level-shifting circuitry - a key enabler for direct transducer interfacing in battery-powered or isolated systems.
What is the significance of "guaranteed no missing codes" for the AD670SD?
"Guaranteed no missing codes" means the AD670SD's transfer function is strictly monotonic across its full operating temperature range (–55°C to +125°C), with every possible 8-bit code (0 to 255) appearing at least once as the analog input sweeps its full range. This is ensured by thin-film SiCr resistor ladder design and laser wafer trimming - critical for closed-loop control, position feedback, and safety-critical monitoring where code gaps could cause system instability or undetected faults.
Can the AD670SD be used in stand-alone mode without a microprocessor?
Yes, the AD670SD supports stand-alone operation: tie CS and CE together, then use R/W pulses to initiate conversions and read results. A single R/W low pulse starts conversion; bringing R/W high after STATUS goes high enables data readout. Continuous conversion is also supported - R/W held low causes repeated conversions synchronized to STATUS transitions - ideal for dedicated analog monitoring channels in PLCs or telemetry modules where host processor bandwidth is constrained.
AD670SD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- Parallel
- Configuration:
- ADC
- Ratio - S/H:ADC:
- 0:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- True Bipolar
- Operating Temperature:
- -55°C ~ 125°C
- Supplier Device Package:
- 20-SBDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD670SD FAQ
1.How can I place an order for AD670SD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD670SD 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 reliable?
The price and inventory of AD670SD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD670SD is usually 5 days.
3.What payment methods are accepted for AD670SD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD670SD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD670SD?
AD670SD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD670SD 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?
For technical support, including AD670SD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD670SD requirements.
6.How does Aetrix verify that AD670SD is sourced from the original manufacturer or authorized distributors?
All AD670SD 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 meets industry standards.
7.What is the process for return or replacement of AD670SD?
All AD670SD units undergo pre-shipment inspection (PSI). If there is an issue with AD670SD, 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 part is unused and in its original packaging.
Return procedure for AD670SD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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