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Analog Devices Inc. AD670JNZ
- Part No.:
- AD670JNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
AD670JNZ.pdf
- Description:
- IC ADC 8BIT SAR 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,240
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Product details
Overview
AD670JNZ 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 inputs up to ±255 mV or ±2.55 V, and guarantees no missing codes over 0°C to +70°C - ideal for transducer interfacing in industrial data acquisition.
For engineers reviewing the AD670JNZ datasheet, AD670JNZ pinout, AD670JNZ application, or AD670JNZ equivalent, this page provides verified technical context, validated pin functions, confirmed input range configurations (0–255 mV / 0–2.55 V unipolar and ±128 mV / ±1.28 V bipolar), real-world timing behavior (300 ns min start pulse, 250 ns bus access), and direct alternatives for legacy system upgrades.
Technical Context
The AD670JNZ implements a dynamic successive approximation register (SAR) using I²L logic and a tapped delay-line architecture-no external clock required. Its front-end instrumentation amplifier provides high-impedance differential inputs with guaranteed 1 LSB common-mode rejection across both 255 mV and 2.55 V ranges.
Conversion control relies on R/W, CS, and CE signals with strict timing: 300 ns minimum write/start pulse width, 700 ns delay to conversion start, and STATUS output indicating active conversion. Output coding (straight binary or 2's complement) and input format (unipolar/bipolar) are selected via FORMAT and BPO/UPO pins prior to conversion initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers discrete digital output with 256 distinct codes per full-scale range |
| Conversion Time | 10 µs - enables up to 100 kSPS sampling without external timing circuitry |
| Input Ranges | 0–255 mV (1 mV/LSB) and 0–2.55 V (10 mV/LSB); configurable bipolar ±128 mV / ±1.28 V via BPO/UPO pin |
| Supply Voltage | +4.5 V to +5.5 V - compatible with standard TTL/CMOS logic rails and eliminates need for dual supplies |
| Relative Accuracy | ±½ LSB (typ) - ensures monotonic transfer function and no missing codes over full temperature range |
| Common-Mode Rejection | 1 LSB (guaranteed) - preserves signal integrity when digitizing transducer outputs riding on noisy ground references |
| Power Consumption | 30–45 mA at +5 V - optimized for embedded systems where supply current impacts thermal design and regulator sizing |
Pinout & Package
AD670JNZ is supplied in a 20-pin plastic DIP (N-20) package with through-hole mounting and 0.3-inch wide body. Pin spacing conforms to JEDEC MS-001 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1–9 | Digital Outputs (D0–D7, STATUS) | Three-state CMOS-compatible outputs; STATUS goes high during conversion and low upon completion |
| Pins 11–15 | Digital Inputs (R/W, CS, CE, FORMAT, BPO/UPO) | Control lines for conversion start/read; FORMAT selects output coding; BPO/UPO configures unipolar/bipolar mode |
| Pins 16–19 | Analog Inputs (±VIN) | Differential instrumentation amp inputs; support ±30 V absolute max with internal scaling resistors |
| Pin 20 | VCC | +5 V power supply input; requires local 0.1 µF bypass capacitor |
| Pin 10 | GND | Power ground reference for analog and digital sections - single-point connection recommended |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Instrumentation Amplifier | Eliminates need for external preamplification when interfacing strain gauges, RTDs, or thermocouples |
| Factory-Calibrated Reference & DAC | Enables ±½ LSB accuracy without user trim pots or calibration routines |
| Dynamic SAR Architecture | Removes dependency on external clock source and improves immunity to clock jitter |
| Flexible Input Scaling | Two differential input spans (255 mV / 2.55 V) and software-selectable bipolar/unipolar modes reduce board-level component count |
| Microprocessor Bus Interface | Direct connection to 8-bit data buses with three-state outputs avoids glue logic or level-shifting ICs |
Applications
| Temperature Sensing | Strain Gauge Readout |
|---|---|
Use Scenario: Digitizing output of AD590 current-output temperature sensor or platinum RTD in HVAC or process control systems. IC Role / Device Role / Timing Role: ADC with integrated instrumentation amp directly conditions and converts slow-varying transducer signals without external op amps or references. Use Value: Achieves 1°C resolution using ±128 mV range and eliminates offset/gain trims via factory calibration. | Use Scenario: Reading bridge-based load cells or pressure transducers in industrial weighing or test equipment. IC Role / Device Role / Timing Role: Signal-conditioning ADC captures differential millivolt-level outputs while rejecting common-mode noise from excitation sources. Use Value: Delivers ~2.1 oz/LSB resolution in ±128 mV mode with guaranteed linearity and no missing codes over operating temperature. |
| Differential Temperature Monitoring | Multiplexed Sensor Acquisition |
Use Scenario: Measuring relative temperature difference between two points using dual AD590 sensors in environmental monitoring. IC Role / Device Role / Timing Role: Configurable bipolar ADC accepts differential inputs from matched transducers and outputs signed 2's complement codes. Use Value: Enables 1°C differential resolution with software-based span/offset correction - no hardware trimming needed. | Use Scenario: Scanning multiple slow-slewing analog channels (e.g., thermistors, potentiometers) in PLC or data logger designs. IC Role / Device Role / Timing Role: Stand-alone ADC controlled by microcontroller GPIOs; supports continuous conversion mode with single read per cycle. Use Value: Reduces channel count cost vs. multi-channel ADCs; 10 µs conversion allows >10 kHz effective scan rate across 8 channels. |
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 |
|---|---|---|---|
| AD7819ANZ | Successive approximation ADC with 100 kSPS speed, no integrated instrumentation amp or reference; requires external op amp and reference | Suitable for higher-speed sampling but adds ≥3 external components for transducer interface | Select when system already includes precision op amps and references, and conversion rate >100 kSPS is required |
| MAX1113CPE+ | 8-bit serial-output ADC with internal reference; lacks instrumentation amp, differential input capability, and bipolar configuration | Limited to single-ended unipolar inputs only; incompatible with bridge or RTD sensors without front-end amplification | Choose for space-constrained designs needing SPI interface and minimal pin count, not transducer direct interface |
Compared with AD7819ANZ and MAX1113CPE+, the AD670JNZ uniquely integrates signal conditioning, reference, and bus interface in one DIP package - reducing BOM count, layout complexity, and calibration effort for transducer-based measurement systems.
Availability
AD670JNZ is available at Aetrix Electronics and suitable for industrial data acquisition, sensor interface modules, and legacy system replacements requiring stable component supply and long-term obsolescence management.
Supply support for AD670JNZ 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, headquartered in Norwood, MA.
The AD670 product line was designed specifically for cost-sensitive, microprocessor-based data acquisition systems requiring integrated signal conditioning - targeting transducer interfacing in industrial, test, and measurement applications.
FAQ
What is the operating temperature range specified for the AD670JNZ?
The AD670JNZ is rated for operation from 0°C to +70°C. This J-grade specification aligns with commercial temperature requirements and is validated across all electrical parameters including conversion time, relative accuracy (±½ LSB), and common-mode rejection. The device maintains guaranteed no-missing-codes performance throughout this range without user calibration.
Does the AD670JNZ require external components to achieve full 8-bit accuracy?
No, the AD670JNZ requires no external components or user trims to achieve full 8-bit accuracy. It integrates an instrumentation amplifier, precision voltage reference, DAC, SAR logic, and three-state output buffers on a single monolithic chip. Factory laser trimming ensures gain and offset accuracy within ±1.5 LSB at +25°C and ±2.0 LSB over temperature - eliminating need for external resistors, capacitors, or trim pots.
How does the AD670JNZ handle bipolar input signals with a single +5 V supply?
The AD670JNZ handles bipolar inputs using its internal instrumentation amplifier front end and BPO/UPO pin control. When BPO/UPO is high during conversion start, it injects a bipolar offset current equal to MSB – ½ LSB into the comparator summing node. This enables true bipolar ranges (±128 mV or ±1.28 V) without negative supply rails - allowing direct digitization of AC-coupled or ground-referenced differential signals.
What are the valid logic levels for digital inputs on the AD670JNZ?
The AD670JNZ digital inputs (R/W, CS, CE, FORMAT, BPO/UPO) accept TTL-compatible logic levels: VINL ≤ 0.8 V for logic low and VINH ≥ 2.0 V for logic high, with input current limited to ±100 µA across 0–5 V. These thresholds ensure reliable interfacing with standard 8-bit microcontrollers and bus drivers without level-shifting circuitry.
Can the AD670JNZ be used in stand-alone mode without a microprocessor?
Yes, the AD670JNZ supports stand-alone operation. By tying CS and CE together and toggling R/W, users can initiate conversions and read results using discrete logic or manual switches. In single-conversion mode, a 300 ns R/W low pulse starts conversion; STATUS indicates completion; then R/W high enables data read. No clock or address decoding is required - making it suitable for benchtop instrumentation or educational labs.
AD670JNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- Parallel
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- True Bipolar
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD670JNZ FAQ
1.How can I place an order for AD670JNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD670JNZ 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 AD670JNZ reliable?
The price and inventory of AD670JNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD670JNZ is usually 5 days.
3.What payment methods are accepted for AD670JNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD670JNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD670JNZ?
AD670JNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD670JNZ 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 AD670JNZ?
For technical support, including AD670JNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD670JNZ requirements.
6.How does Aetrix verify that AD670JNZ is sourced from the original manufacturer or authorized distributors?
All AD670JNZ 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 AD670JNZ meets industry standards.
7.What is the process for return or replacement of AD670JNZ?
All AD670JNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD670JNZ, 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 AD670JNZ part is unused and in its original packaging.
Return procedure for AD670JNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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