AD670JP - 8-Bit 2-Input SAR ADC | Analog Devices | PLCC-20
料号： AD670JP ✓ 量产中AD670JP 概述
An ADC is an integrated circuit that converts a continuously varying analog voltage into a numeric code. Within the semiconductor hierarchy, the AD670JP belongs to the data-converter IC class and more specifically to the ADC category. Its successive-approximation register architecture compares the unknown input against an internal DAC, one binary bit at a time, until the converted code is resolved. Parallel output presents the completed digital result directly on dedicated output pins rather than relying on a serial clock and data line.
The AD670JP provides one converter with two input connections and 8-bit resolution. The 20-pin PLCC package supports surface-mount assembly, while the AD670 family also includes A-grade and B-grade versions specified from -40 °C to +85 °C and an S grade specified from -55 °C to +125 °C. Internal reference architecture, differential input, and selectable input polarity broaden its usefulness for transducer, control, and instrumentation applications.
Because its resolution is 8 bits, the converter provides 256 discrete output codes. The AD670JP is therefore appropriate where precise proportional measurement, position sensing, process monitoring, or digital control is more important than fine quantization. Because parallel outputs require dedicated board routing and shielding from switching noise, the device is generally better suited to moderate-speed acquisition than to high-pin-count, very high-rate converter systems.
Typical applications include industrial sensor interfaces, digital thermometry, analog control-loop monitoring, position and transducer measurement, panel meters, and low-cost embedded data-acquisition boards. A PLCC footprint also makes AD670JP relevant to legacy industrial equipment and maintenance inventories where changing the original converter would require redesigning the PCB rather than merely replacing the component.
The main design consideration is that an 8-bit result limits system resolution to roughly 0.4% of full scale after accounting for endpoint behavior and practical signal conditioning. The board should provide clean analog routing, adequate bypassing, and input protection appropriate to the measured signal. Compatibility with a replacement part must be confirmed from the manufacturer datasheet rather than inferred from the converter resolution alone.
This page consolidates the verified distributor listing, manufacturer family information, package details, temperature-grade options, and cross-reference evidence for AD670JP. It also identifies where public data is incomplete, including pricing, sampling rate, exact pin naming, and confirmed multi-part substitutes, so engineers can make sourcing decisions without treating unavailable specifications as established facts.
直接替换替代料： AD670JP ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： AD670JP （相同外形与封装尺寸） ——差异在于 Package.
AD670JPZ
✅ 直接替换📋 参考替代料（不在目录中）
AD670JP 最大额定值与电气特性
| ADC Type | Successive-approximation register (SAR) ADC |
| 分辨率 | 8 bit |
| Number of Converters | 1 |
| Number of Inputs | 2 |
| Input Configuration | Differential |
| Input Polarity | Bipolar or unipolar |
| Output Interface | Parallel |
| Reference Type | Internal |
| 电源电压 | 4.5 V to 5.5 V |
| 封装 | 20-pin PLCC (9 mm x 9 mm) |
| 安装方式 | Surface mount |
| Shipping Package | Tube |
| A and B Grade Operating Temperature | -40 °C to +85 °C |
| S Grade Operating Temperature | -55 °C to +125 °C |
| Number of Output Codes | 256 |
AD670JP tube 引脚配置指南
AD670JP（tube 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： AD670JP.
请参阅 数据手册 以查看完整引脚配置。
典型应用
AD670JP 适用于 6 应用s: Industrial Sensor Signal Conditioning, Digital Thermometry and Temperature Monitoring, Legacy PLC and Process Control Modules, Position and Transducer Measurement, Embedded Data-Acquisition and Measurement Systems, Panel Meters and Digital Displays.
Industrial Sensor Signal Conditioning
The AD670JP fits legacy industrial sensor interfaces because it combines a complete 8-bit conversion path with two inputs, differential configuration, internal reference, and selectable bipolar or unipolar operation. Its 4.5 V to 5.5 V supply range matches common 5 V control systems, and the parallel output can be read directly by an 8-bit microprocessor data bus. The principal engineering limitation is quantization: 256 codes may be adequate for supervisory measurement but insufficient for precision closed-loop control. Designers should buffer sensor outputs, protect inputs from industrial transients, and verify the actual analog input range against the manufacturer datasheet before finalizing the front end.
推荐
Digital Thermometry and Temperature Monitoring
The AD670JP can convert the output of a temperature sensor into an 8-bit digital result for display, logging, or threshold control. Two inputs allow monitoring of two temperature channels or one channel plus a reference, while differential operation can help reject common-mode voltage at the converter input. The 8-bit resolution offers 256 levels, making this arrangement appropriate for coarse thermal control, HVAC panels, or equipment-health monitoring rather than precision thermometry. Because the verified data does not state input range or sampling rate, the sensor scale, acquisition time, and update rate must be confirmed from the AD670 datasheet.
推荐
Legacy PLC and Process Control Modules
The AD670JP is appropriate for maintaining older PLC, PID, or process-control modules that originally used a 20-pin PLCC footprint and an 8-bit parallel ADC. Its single SAR converter performs successive-approximation conversion and presents the result on a parallel bus, avoiding the need to redesign the processor interface. The differential input and internal reference can simplify restoration of aging boards, provided the original device operated with the same signal polarity and reference arrangement. Engineers should also check the grade-specific temperature range and obsolescence risk, because the AD670 family includes separate A, B, and S temperature grades.
推荐
Position and Transducer Measurement
The AD670JP can digitize the output of a resistive, inductive, or voltage-output position transducer in equipment built around older embedded electronics. Two differential-capable inputs let a controller monitor position and a complementary reference or second axis, while the internal reference reduces the external component count for ratiometric sensing. Its 8-bit resolution provides 256 codes, which is generally adequate for coarse valve-position, dial-angle, or limit-detection feedback but not for precision motion control. Use the verified 4.5 V to 5.5 V supply range for the digital side, and verify the permitted analog input range, input impedance, and acquisition time in the manufacturer data.
推荐
Embedded Data-Acquisition and Measurement Systems
The AD670JP is usable in low-cost embedded measurement systems where a parallel ADC is already supported by the controller. Eight-bit outputs can connect directly to an 8-bit microcontroller bus, and the SAR architecture suits repeated acquisition of relatively slow or event-driven signals. The two inputs allow the firmware to alternate between a measurement channel and an internal or external calibration reference, which supports drift compensation in instrumentation. However, the 20-pin PLCC footprint is obsolete from a modern board-layout perspective, and sampling speed is not present in the verified data. New designs should therefore benchmark a serial ADC before committing to this package.
推荐
Panel Meters and Digital Displays
The AD670JP supports legacy panel-meter and digital-display designs where a measured analog quantity must be converted into an 8-bit value for a display controller. Its parallel output reduces bus overhead and allows the host processor to apply calibration tables, averaging, or limit alarms. Two inputs can serve the measurement and a front-panel identification or calibration channel. The internal reference supports repeatable ratiometric operation when the analog source is proportional to a shared reference, but the exact reference implementation must be confirmed in the manufacturer datasheet. For new panels, low-power LCD controllers and modern serial ADCs may provide lower cost and fewer board traces.
推荐
推荐产品汇总
工程参考数据： AD670JP ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | AD670JPZ |
|---|---|---|
| Brand | Analog Devices | Analog Devices |
| Package | PLCC-20 (9 mm x 9 mm) | PLCC-20 - same package |
| Resolution | 8 bit | 8 bit |
| Converter Architecture | Successive-approximation register (SAR) | Successive-approximation register (SAR) |
| Number of Converters | 1 | 1 |
| Number of Inputs | 2 | 2 |
| Output Interface | Parallel | Parallel |
| Reference Type | Internal | Internal |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Input Polarity | Bipolar or unipolar | Bipolar or unipolar |
关键差异点
- Directly supported same-package replacement （对比 AD670JPZ)
- Complete legacy 8-bit signal-conditioning conversion path （对比 AD670JPZ)
- Suitable temperature-grade family coverage （对比 AD670JPZ)
设计说明
Do not treat AD670JP, AD670JPZ, and reel-packed AD670 listings as automatically equivalent. The verified FindIC comparison supports AD670JPZ as a functionally consistent, same-terminal, same-package replacement, but ordering suffixes can encode grade, temperature, qualification, or packing differences. Before substitution, confirm the exact grade suffix, electrical limits, operating-temperature range, and package orientation in the manufacturer data. A physical PLCC-20 socket does not by itself establish electrical or qualification compatibility.
Route the analog input, reference, and ground paths away from the eight parallel digital output lines and any switching nodes. Place input and bypass capacitors adjacent to the corresponding device pins, use a compact analog ground region where the board design permits, and keep the connector-side analog traces short. Because the verified data does not include recommended layouts, exact capacitor values and placement must follow the AD670 datasheet and the specific board's switching environment.
The AD670JP's parallel outputs can switch simultaneously during code transitions, producing transient current through output-driver and board-trace capacitance. Where the host bus is sensitive, account for simultaneous-output noise, maintain short output traces, and terminate unused outputs only after checking the device's output structure. If the verified sampling rate proves inadequate for the intended loop, a modern serial ADC is usually easier to route and can reduce board area, although it will require a layout redesign.
The AD670JP operates from 4.5 V to 5.5 V, so a 5 V rail must remain inside that tolerance under load and transient conditions. Provide local decoupling at the device and keep supply return paths continuous. Estimated conversion power cannot be calculated from the supplied data because current consumption is not listed; consult the manufacturer datasheet for operating and quiescent current before sizing a regulator for a large bank of converters.
合规信息
The verified manufacturer and distributor snippets do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred from the device's age or package. The AD670 product page mentions A, B, and S temperature grades and optional MIL-STD-883 processing for the S grade, but no S-grade AD670JP part number was identified in the supplied data.
