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Analog Devices Inc. AD670JP
- Part No.:
- AD670JP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-LCC (J-Lead)
- Datasheet:
-
AD670JP.pdf
- Description:
- IC ADC 8BIT SAR 20PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,868
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Product details
Overview
AD670JP 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 10 µs conversion time, ±1/2 LSB relative accuracy at +25°C, single +5 V supply operation, and supports differential unipolar/bipolar inputs (0–255 mV or 0–2.55 V). It is used in transducer interfacing for industrial temperature, strain gage, and RTD measurement systems.
For engineers reviewing the AD670JP datasheet, AD670JP pinout, AD670JP application, or AD670JP equivalent, this page provides verified technical context, package-specific pin functions, real-world use scenarios, and validated alternative options for embedded data acquisition designs requiring no external trims or support components.
Technical Context
The AD670JP implements a dynamic successive approximation register (SAR) using an inverter-based delay-line architecture-no external clock required. Its front-end instrumentation amplifier enables direct differential transducer connection with guaranteed no missing codes over 0°C to +70°C and common-mode rejection of ≤1 LSB across both input ranges.
Control logic interprets R/W, CS, and CE signals for write/convert and read operations; STATUS output indicates active conversion. Input range (unipolar/bipolar) and output coding (straight binary/two's complement) are selected via BPO/UPO (Pin 11) and FORMAT (Pin 12), with configuration latched at conversion start.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit-supports full 256-level digitization without missing codes over temperature. |
| Conversion Time | 10 µs-enables up to 100 kSPS sampling in burst mode with microprocessor handshaking. |
| Relative Accuracy | ±1/2 LSB at +25°C-ensures monotonic transfer curve and calibrated linearity without user trimming. |
| Analog Input Ranges | 0–255 mV (1 mV/LSB) or 0–2.55 V (10 mV/LSB), selectable via internal attenuators-matches common transducer outputs directly. |
| Supply Voltage | +4.5 V to +5.5 V-operates from standard microprocessor +5 V rail with no auxiliary supplies needed. |
| Input Interface | Differential instrumentation amplifier front end-provides high CMRR and eliminates need for external preamplification in bridge/RTD applications. |
| Digital Interface | Three-state parallel 8-bit bus with R/W, CS, CE, and STATUS-directly connects to 8080/8085/Z80-style microprocessor data buses. |
Pinout & Package
AD670JP is supplied in a 20-terminal plastic leaded chip carrier (PLCC, package code P-20A), surface-mount compatible with gull-wing leads and JEDEC MO-047 outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1–8, 10 | Digital Output Bus (D0–D7) | Three-state CMOS-compatible outputs delivering 8-bit conversion result; high-impedance when CE or CS high. |
| Pin 9 | STATUS | Active-high open-collector signal indicating conversion in progress; goes low at completion. |
| Pin 11 | BPO/UPO | Selects bipolar (high) or unipolar (low) input format; latched at conversion start. |
| Pin 12 | FORMAT | Selects two's complement (high) or straight binary (low) output coding; latched at conversion start. |
| Pins 13, 14 | CS / CE | Interchangeable active-low chip select/enable inputs-minimum 300 ns pulse initiates conversion or read. |
| Pin 15 | R/W | Read/write control-low starts conversion, high enables data read; timing synchronized with CS/CE. |
| Pins 16–19 | +VIN, –VIN, +IN, –IN | Differential analog input terminals-accept ±128 mV or ±1.28 V bipolar, or 0–255 mV / 0–2.55 V unipolar signals. |
| Pin 20 | VCC | +5 V power supply-powers all internal blocks including reference, amp, SAR, and buffers. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated instrumentation amplifier | Enables direct differential transducer connection with >100 dB CMRR at DC and stable bias current (<500 nA) across temperature. |
| No user trims required | Laser-trimmed thin-film SiCr resistor ladder and factory-calibrated gain/offset ensure ±1/2 LSB accuracy without external adjustments. |
| Dynamic SAR architecture | Eliminates need for external clock; achieves deterministic 10 µs conversion via inverter delay-line sequencing. |
| Flexible input/output configuration | Hardware-selectable unipolar/bipolar input and straight binary/two's complement output via dedicated control pins. |
| Single-supply +5 V operation | Reduces system BOM by removing need for dual-rail supplies or charge pumps-compatible with legacy microprocessor rails. |
Applications
| Temperature Sensing | Strain Gage Interface |
|---|---|
Use Scenario: Digitizing output of AD590 current-output temperature sensor in HVAC or environmental monitoring systems. 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 in ±128 mV bipolar range without external amplification or calibration components. | Use Scenario: Reading millivolt-level differential output from JP-20 load cell in industrial weighing systems. IC Role / Device Role / Timing Role: Signal-conditioning ADC acquires ratiometric bridge output directly, rejecting common-mode noise from excitation source. Use Value: Delivers ~2.1 oz/LSB resolution over ±17 lb range using on-chip differential front end and 1 mV/LSB scaling. |
| RTD Measurement | Multiplexed Transducer Acquisition |
Use Scenario: Converting resistance change of 100 Ω platinum RTD in process control loops. IC Role / Device Role / Timing Role: ADC measures voltage drop across RTD excited by constant-current source; differential inputs reject ground noise. Use Value: Enables 1 mV/°C sensitivity with 0–255°C full-scale range in 255 mV input mode-no external gain stage needed. | Use Scenario: Shared ADC servicing multiple bridge-type sensors (e.g., pressure, flow, level) via analog multiplexer. IC Role / Device Role / Timing Role: Standalone ADC with STATUS handshake allows precise timing control of channel switching and sample capture. Use Value: Reduces per-channel component count by eliminating individual signal conditioners-supports <100 kSPS aggregate throughput. |
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 |
|---|---|---|---|
| AD7823BN | 8-bit, 1.5 µs SAR ADC with internal reference but no instrumentation amp; requires external signal conditioning. | Best for systems with existing preamp stages or where speed >100 kSPS is critical. | Choose AD7823BN only if external amplification is already present and sub-2 µs conversion is required. |
| MAX187ACPP | 8-bit, 12 µs SAR ADC with internal reference and track/hold; no integrated instrumentation amp or differential input stage. | Suitable for single-ended sources or designs where board space permits discrete front-end design. | Select MAX187ACPP when cost-per-channel is prioritized over integration and transducer interface simplicity. |
Compared with AD7823BN and MAX187ACPP, the AD670JP uniquely integrates a precision instrumentation amplifier and flexible bipolar/unipolar input scaling-eliminating up to four external components per channel while maintaining guaranteed no-missing-codes performance over 0°C to +70°C.
Availability
AD670JP is available at Aetrix Electronics and suitable for industrial temperature sensing, strain gage measurement, RTD interface, and multiplexed transducer acquisition requiring stable component supply and long-term obsolescence management.
Supply support for AD670JP 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing ICs for precision measurement and control.
The AD670JP belongs to Analog Devices' legacy signal conditioning ADC product line, designed specifically for embedded data acquisition systems requiring minimal external components, single-supply operation, and direct transducer interfacing.
FAQ
What is the operating temperature range specified for the AD670JP?
The AD670JP is rated for operation from 0°C to +70°C. This commercial-grade specification is confirmed in the Ordering Guide and applies specifically to the PLCC (P-20A) package variant. The device guarantees no missing codes and maintains ±1/2 LSB relative accuracy at +25°C within this range. Extended temperature versions (e.g., AD670A, AD670S) use ceramic DIP packages and are not applicable to the AD670JP part number.
Does the AD670JP require external calibration components or user trims?
No, the AD670JP requires no external calibration components or user trims. It incorporates laser-trimmed thin-film SiCr resistors and factory-calibrated gain/offset circuitry, ensuring ±1/2 LSB relative accuracy and guaranteed no missing codes over its full temperature range. All specifications-including differential linearity, zero error, and gain accuracy-are achieved without any external adjustments, as explicitly stated in the Features and General Description sections of the datasheet.
How does the AD670JP handle bipolar versus unipolar input configurations?
The AD670JP selects bipolar or unipolar input mode via Pin 11 (BPO/UPO): grounded for unipolar, tied to VCC for bipolar. In unipolar mode, it accepts 0–255 mV or 0–2.55 V inputs; in bipolar mode, it accepts ±128 mV or ±1.28 V. The selection is latched at conversion start and works in conjunction with the FORMAT pin to determine output coding (straight binary or two's complement), as defined in Table I of the datasheet.
What is the conversion time of the AD670JP and how is it achieved without an external clock?
The AD670JP has a fixed conversion time of 10 µs. It achieves this using a "dynamic SAR" architecture based on an inverter delay-line with tapped one-shots-no external clock is required. The delay-line generates precisely timed pulses that sequence the DAC bits and strobe the comparator, enabling deterministic conversion timing independent of system clocking. This is distinct from conventional clock-driven SAR converters and is confirmed in the Circuit Operation section.
Can the AD670JP be interfaced directly to an 8085 microprocessor bus?
Yes, the AD670JP is designed for direct interface to 8085, 8080, and Z80 microprocessor buses. Its three-state 8-bit digital outputs, active-low CS/CE inputs, R/W control, and STATUS signal align with standard microprocessor timing requirements. The datasheet provides explicit timing diagrams (Figures 8–9) and truth tables confirming compatibility, including minimum 300 ns control pulse widths and 250 ns bus access time-fully meeting 8085 bus cycle constraints.
AD670JP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-PLCC (9x9)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD670JP FAQ
1.How can I place an order for AD670JP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD670JP 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 AD670JP reliable?
The price and inventory of AD670JP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD670JP is usually 5 days.
3.What payment methods are accepted for AD670JP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD670JP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD670JP?
AD670JP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD670JP 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 AD670JP?
For technical support, including AD670JP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD670JP requirements.
6.How does Aetrix verify that AD670JP is sourced from the original manufacturer or authorized distributors?
All AD670JP 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 AD670JP meets industry standards.
7.What is the process for return or replacement of AD670JP?
All AD670JP units undergo pre-shipment inspection (PSI). If there is an issue with AD670JP, 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 AD670JP part is unused and in its original packaging.
Return procedure for AD670JP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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