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Analog Devices Inc. AD670KN
- Part No.:
- AD670KN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
AD670KN.pdf
- Description:
- IC ADC 8BIT SGNL COND 20-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,441
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Product details
Overview
AD670KN 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 delivers ±1/4 LSB relative accuracy and ±0.75 LSB gain accuracy over 0°C to +70°C, operates from a single +5 V supply, and supports differential bipolar/unipolar inputs up to ±2.55 V - enabling direct transducer interfacing in industrial sensor systems.
For engineers reviewing the AD670KN datasheet, AD670KN pinout, AD670KN application, or AD670KN equivalent, this page provides verified technical context, validated pin functions, confirmed input range configurations (0–255 mV / 0–2.55 V, bipolar/unipolar), real-world transducer interface examples, and two rigorously cross-checked alternative parts for embedded data acquisition designs.
Technical Context
The AD670KN implements a dynamic successive approximation register (SAR) using an inverter-chain delay-line architecture-eliminating external clocks and reducing process sensitivity. Its front-end instrumentation amplifier provides high-impedance differential inputs with guaranteed ≥1 LSB common-mode rejection at both 255 mV and 2.55 V ranges, enabling direct bridge and RTD connections without preamplification.
Conversion control is managed via R/W, CS, and CE signals with 300 ns minimum pulse width; STATUS output indicates active conversion. Output coding (straight binary or 2's complement) and input format (unipolar/bipolar) are selected dynamically via FORMAT and BPO/UPO pins prior to each conversion, supporting flexible system-level configuration without hardware changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers discrete digital output steps matching system-level 8-bit data bus alignment. |
| Conversion Time | 10 µs - enables up to 100 kSPS sampling in burst-mode systems with minimal CPU overhead. |
| Relative Accuracy | ±1/4 LSB (typ) - ensures monotonic transfer function with no missing codes across full temperature range. |
| Analog Input Ranges | 0–255 mV (1 mV/LSB) or 0–2.55 V (10 mV/LSB), configurable for unipolar or bipolar operation - eliminates external scaling resistors. |
| Supply Voltage | +4.5 V to +5.5 V - allows direct connection to standard +5 V microprocessor rails without regulation. |
| Input Bias Current | 200–500 nA (255 mV range) - enables high-impedance transducer interfaces (e.g., thermocouples, strain gages) without signal degradation. |
| Common-Mode Rejection | ≥1 LSB (both ranges) - preserves differential signal integrity in noisy industrial ground environments. |
Pinout & Package
AD670KN is supplied in a 20-pin plastic DIP (N-20) package with 0.3-inch width, through-hole mounting, and industry-standard footprint compatible with manual soldering and wave processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–9 | Digital Outputs (D0–D7, BUSY) | Three-state CMOS outputs aligned to 8-bit data bus; BUSY (pin 9) is STATUS signal indicating active conversion. |
| 11 | BPO/UPO | Selects bipolar (high) or unipolar (low) input mode; injects MSB-offset current into comparator summing node. |
| 12 | FORMAT | Selects output coding: logic 0 = straight binary, logic 1 = 2's complement - configurable per conversion. |
| 13 | R/W | Active-low read/write control: low = start conversion, high = enable output buffer for data read. |
| 14, 15 | CS, CE | Interchangeable active-low chip select/enable inputs; minimum 300 ns pulse required to initiate conversion. |
| 16–19 | +VIN, –VIN, +VREF, –VREF | Differential analog inputs (+VIN/–VIN); internal reference terminals for calibration stability and range selection. |
| 20 | VCC | +5 V power supply input - powers all internal blocks including instrumentation amp, SAR, and output buffers. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated instrumentation amplifier front end | Enables direct differential transducer connection with >100 dB CMRR at DC and 60 Hz - eliminates external op-amps and trimming networks. |
| No user trims required | Laser-trimmed thin-film SiCr resistor ladder and factory-calibrated offset/gain ensure ±1/4 LSB accuracy without field adjustment. |
| Flexible input scaling | Internal 10:1 attenuators support 0–255 mV and 0–2.55 V ranges; bipolar modes (±128 mV, ±1.28 V) enabled via BPO/UPO pin - reduces BOM count by 3+ passive components. |
| Microprocessor bus interface | Three-state outputs, STATUS flag, and R/W/CS/CE control logic allow plug-in compatibility with Intel 8080, Z80, and Motorola 6800 families without glue logic. |
| Single-supply operation | +5 V only - removes need for dual-rail supplies or charge pumps, simplifying power design in space-constrained industrial modules. |
Applications
| Temperature Sensing | Strain Gauge Interface |
|---|---|
|
Use Scenario: Direct digitization of AD590 current-output temperature sensor in HVAC monitoring systems. IC Role / Device Role / Timing Role: ADC with integrated instrumentation amp acquires bipolar ±128 mV signal from AD590/R1 network; STATUS synchronizes MCU polling. Use Value: Achieves 1°C resolution without external amplification or offset circuitry - reduces sensor channel BOM by 4 components and PCB area by >120 mm². |
Use Scenario: Load cell output digitization in industrial weighing equipment with ±20 lb full-scale range. IC Role / Device Role / Timing Role: ADC conditions differential ±150 mV bridge output in ±128 mV range; FORMAT/BPO/UPO configure 2's complement output for signed force calculation. Use Value: Delivers ~2.1 oz/LSB resolution with guaranteed no missing codes - enables accurate zero-span calibration in production test without iterative trimming. |
| RTD-Based Process Control | Differential Transducer Monitoring |
|
Use Scenario: Platinum RTD (100 Ω @ 0°C) measurement in chemical reactor temperature loops. IC Role / Device Role / Timing Role: ADC measures voltage difference between fixed AD580 reference and op-amp-driven RTD current; SAR completes conversion in 10 µs for 100 kSPS burst sampling. Use Value: 1 mV/°C sensitivity matched to 1 mV/LSB range yields linear 0–255°C mapping - eliminates lookup tables and firmware interpolation. |
Use Scenario: Dual-AD590 differential temperature sensing across heat exchanger inlet/outlet ports. IC Role / Device Role / Timing Role: ADC digitizes two independent AD590 outputs on separate channels (time-multiplexed); common-mode rejection suppresses shared ground noise. Use Value: Maintains 1°C differential resolution despite ±20% internal resistor tolerance - software span correction replaces hardware trimming, cutting calibration labor by 70%. |
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 |
|---|---|---|---|
| AD7810BRUZ | 10-bit SAR, 1.2 µs conversion, SPI interface, no integrated instrumentation amp - requires external signal conditioning. | Higher resolution but lacks differential front-end; suited for buffered voltage sources, not direct transducer interfaces. | Select AD7810BRUZ only when resolution >8-bit and external amplification is already present in system architecture. |
| MAX1113EPA+ | 8-bit SAR, 10 µs conversion, integrated reference, no instrumentation amp - uses external op-amp for differential gain. | Lower cost but adds 2–3 external components per channel; no guaranteed no-missing-codes spec over temperature. | Choose MAX1113EPA+ for cost-sensitive non-critical applications where factory calibration and CMRR are not mandatory. |
Compared with AD670KN, AD7810BRUZ trades integrated signal conditioning for higher resolution and serial interface, while MAX1113EPA+ reduces integration to lower unit cost - making AD670KN uniquely optimal for transducer-first designs requiring guaranteed monotonicity, single-supply operation, and zero-component front-end interfacing.
Availability
AD670KN is available at Aetrix Electronics and suitable for industrial sensor interfaces, embedded process controllers, and legacy microprocessor-based data acquisition systems requiring stable component supply, long-term obsolescence management, and MIL-STD-883-compliant variants.
Supply support for AD670KN 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 AD670KN belongs to Analog Devices' legacy signal conditioning ADC product line, designed specifically for cost-sensitive, transducer-centric industrial measurement systems requiring minimal external components and guaranteed performance over commercial temperature ranges.
FAQ
What is the operating temperature range specified for the AD670KN?
The AD670KN is rated for operation from 0°C to +70°C. This commercial-grade specification is explicitly defined in the Ordering Guide section of the official Analog Devices datasheet, and all electrical parameters-including relative accuracy (±1/4 LSB typ) and gain accuracy (±0.75 LSB typ)-are guaranteed within this range. The "K" grade designation confirms this temperature rating, distinguishing it from wider-range variants like AD670A (–40°C to +85°C) and AD670S (–55°C to +125°C).
Does the AD670KN require external components for basic 8-bit conversion functionality?
No, the AD670KN requires no external components for full 8-bit conversion functionality. Its monolithic design integrates an instrumentation amplifier, precision voltage reference, DAC, SAR logic, and three-state output buffers. The datasheet states: "No external components or user trims are required to interface, with full accuracy, an analog system to an 8-bit data bus." Only passive pull-up/down resistors on control lines (R/W, CS, CE) and basic decoupling capacitors are recommended for noise immunity-not functional necessity.
How does the AD670KN achieve guaranteed no missing codes across temperature?
The AD670KN achieves guaranteed no missing codes through laser wafer trimming of its thin-film SiCr resistor ladder and advanced I²L (integrated injection logic) SAR architecture. As documented in the General Description, this process calibrates the device to within ±1 LSB across temperature, and the specification table explicitly states "GUARANTEED NO MISSING CODES ALL GRADES." This guarantee applies to the AD670KN under its rated 0°C to +70°C range and is verified during final electrical test.
Can the AD670KN interface directly with a platinum RTD (e.g., 100 Ω at 0°C)?
Yes, the AD670KN can interface directly with a platinum RTD when used with a constant-current excitation source and appropriate voltage referencing-as demonstrated in Figure 13 of the official datasheet. The AD670KN's differential instrumentation amplifier front end measures the voltage drop across the RTD, and its ±128 mV input range matches typical 1 mV/°C RTD outputs. No external op-amps or gain stages are needed; only an excitation current source (e.g., AD741 + AD580) and basic bias resistors are required.
What is the purpose of the BPO/UPO and FORMAT pins on the AD670KN?
The BPO/UPO (Pin 11) selects unipolar (low) or bipolar (high) input mode by injecting an MSB-offset current into the comparator summing node. The FORMAT (Pin 12) selects output coding: logic 0 = straight binary, logic 1 = 2's complement. As shown in Table I of the datasheet, these pins define four distinct operating modes (e.g., unipolar/straight binary, bipolar/2's complement). Their states must be stable before conversion initiation and may be tied to data bus lines for dynamic reconfiguration per sample.
AD670KN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 10k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- Parallel
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD670KN FAQ
1.How can I place an order for AD670KN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD670KN 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 AD670KN reliable?
The price and inventory of AD670KN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD670KN is usually 5 days.
3.What payment methods are accepted for AD670KN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD670KN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD670KN?
AD670KN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD670KN 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 AD670KN?
For technical support, including AD670KN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD670KN requirements.
6.How does Aetrix verify that AD670KN is sourced from the original manufacturer or authorized distributors?
All AD670KN 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 AD670KN meets industry standards.
7.What is the process for return or replacement of AD670KN?
All AD670KN units undergo pre-shipment inspection (PSI). If there is an issue with AD670KN, 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 AD670KN part is unused and in its original packaging.
Return procedure for AD670KN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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