AD9686TQ - 7ns Single Comparator, 35mA | Analog Devices
MPN： AD9686TQ ✗ 停產AD9686TQ 概覽
A comparator is an integrated circuit that compares two input voltages and produces a digital output indicating which input is higher. In the signal-chain hierarchy, the AD9686TQ belongs to the comparator family within analog and linear integrated circuits, where it serves as the decision element between an analog sensing node and a downstream digital or control system. Unlike an operational amplifier used mainly for closed-loop amplification, the comparator provides fast open-loop logic behavior with no intentional feedback compensation.
The principal performance characteristics of the AD9686TQ include a 7 ns propagation delay, 2 mV offset voltage, 4 uA input bias current, and 35 mA operating supply current. Its 16-pin ceramic package supports operation from -55°C to +125°C, while the latch-function TTL-compatible output supports direct interfacing with digital control logic. The 35 mA supply requirement is consistent with a high-speed bipolar comparator and should be included in system power-budget calculations.
The device uses bipolar input and output circuitry optimized for rapid decision transitions. Its low input bias current reduces loading on high-impedance sources, while the 2 mV offset specification defines the input range in which the output state is not guaranteed near the comparison threshold. Designers should add adequate hysteresis when the compared signals can cross slowly or when noise near the threshold could cause repeated output toggling. The latch function can hold the comparator state for system timing and event-capture applications.
Typical uses include pulse-width detection, zero-cross detection, window comparison, automatic-range measurement, and high-speed threshold supervision. In instrumentation, the AD9686TQ can compare a sensor-derived voltage against a reference level and generate a control signal for an ADC, counter, or data-acquisition subsystem. In industrial control equipment, the extended temperature range supports equipment operating in hot or cold environments where commercial-temperature plastic packages would be insufficient.
The principal design consideration is that the 7 ns delay is very short compared with the input offset voltage of 2 mV. A system requiring deterministic decisions close to the threshold should therefore combine appropriate input conditioning, positive feedback for hysteresis, and careful routing to minimize noise pickup. Check the manufacturer pin-description table before assigning board traces, and confirm the supply-voltage limits and output-state definitions in the manufacturer datasheet.
This page organizes the AD9686TQ specifications, package information, sourcing pathway, and application guidance in one place. It also documents the limitations of the available cross-reference record, compares the verified operating characteristics, and identifies practical selection questions that are important before the ceramic-package comparator is committed to a new design.
直接替換替代品，適用於 AD9686TQ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品AD9686TQ 最大額定值與電氣特性
| Product Type | Single voltage comparator |
| Comparator Type | Bipolar single comparator |
| Propagation Delay | 7 ns |
| Input Offset Voltage | 2 mV |
| 供應電流 | 35 mA |
| Input Bias Current | 4 uA |
| 工作溫度範圍 | -55°C to +125°C |
| 封裝 | 16-pin CERDIP |
| 腳位數 | 16 pins |
| 輸出類型 | TTL-compatible latch function |
| Technology | Bipolar |
| 安裝類型 | Through-hole ceramic dual-inline package |
| Military Temperature Grade | -55°C to +125°C |
AD9686TQ 16-pin cerdip 腳位配置指南
AD9686TQ（16-pin cerdip 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： AD9686TQ.
請參閱 資料表 以查看完整腳位配置。
典型應用
AD9686TQ 適用於 6 應用s: High-Speed Pulse Detection, Zero-Cross and Level Monitoring, Instrumentation Signal Conditioning, Industrial Control and Automation, Automatic-Range Measurement, Legacy Maintenance and Retrofit.
High-Speed Pulse Detection
The AD9686TQ is suitable for detecting narrow pulse edges because its 7 ns propagation delay limits timing uncertainty at the comparator output. Connect one input to a biased threshold and the other to the pulse source, then add controlled positive feedback when the source crosses the threshold slowly. The 4 uA input bias current limits loading on high-impedance pulse generators. Because the offset voltage is 2 mV, condition small signals before comparison or specify a hysteresis band that is comfortably above the expected noise level. The TTL-compatible output can drive a counter, capture circuit, or downstream digital control stage without an intermediate amplifier.
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Zero-Cross and Level Monitoring
The AD9686TQ can convert an analog crossing event into a logic transition for zero-cross detection, limit monitoring, and threshold supervision. Its 7 ns propagation delay supports accurate event timing, while the 2 mV input offset defines the practical uncertainty region around the threshold. Use hysteresis to prevent a noisy or slowly varying input from repeatedly crossing the switching point. The 35 mA supply current must be included in the analog power budget, and the -55°C to +125°C operating range supports equipment exposed to severe environmental conditions.
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Instrumentation Signal Conditioning
In test and measurement equipment, the AD9686TQ can compare a conditioned sensor signal against a reference voltage and produce a fast control decision for an ADC, counter, or data-acquisition system. The 4 uA input bias current is useful when the comparison source has relatively high impedance, and the 7 ns delay helps preserve timing relationships between measured events and control actions. The 2 mV offset requirement should be evaluated against the smallest signal excursion of interest. Input protection, reference filtering, and intentional hysteresis are more important than propagation delay when the decision is made close to the analog noise floor.
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Industrial Control and Automation
The AD9686TQ fits legacy industrial control, motion, and process-monitoring designs that require fast bipolar threshold decisions across an extended temperature range. Its -55°C to +125°C rating covers harsh equipment environments, and the TTL-compatible latch-function output supports event capture and sequencing. The through-hole 16-pin ceramic package is mechanically durable for legacy chassis and board designs. Before adopting it in a new controller, verify the exact supply-voltage range, input common-mode limits, and latch truth table in the manufacturer datasheet, and budget for the 35 mA operating current.
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Automatic-Range Measurement
The AD9686TQ can implement an automatic-range decision by comparing an attenuated measurement signal with a precision reference threshold. Its 7 ns response allows the range-change decision to be registered rapidly, while the 4 uA bias current reduces disturbance to the measured node. A 2 mV offset places a limit on the smallest usable measurement increment, so adequate amplification and filtering are required when the source signal approaches that range. The extended-temperature capability allows the same comparison stage to operate in industrial or military-temperature equipment without relying on a commercial-temperature plastic package.
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Legacy Maintenance and Retrofit
The AD9686TQ is well suited to repairing or extending legacy analog control equipment where an existing board uses a 16-pin ceramic DIP single comparator. Maintaining the original technology can reduce board-layout risk, provided the replacement device has the same electrical limits, pin functions, and latch behavior. The ceramic package and -55°C to +125°C operating range make it particularly relevant to older industrial and defense-related systems. For such builds, specify required traceability, connector finish, and date-code handling in the purchase request, and validate the complete board for timing margin after substitution.
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工程參考資料，適用於 AD9686TQ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Package | 16-pin CERDIP |
| Brand | Analog Devices |
| Comparator Configuration | Single bipolar comparator |
| Propagation Delay | 7 ns |
| Input Offset Voltage | 2 mV |
| Supply Current | 35 mA |
| Input Bias Current | 4 uA |
| Operating Temperature Range | -55°C to +125°C |
| Output Function | TTL-compatible latch function |
主要差異化特點
- Very fast threshold decision (對比General-purpose comparators with longer propagation delays)
- Extended environmental temperature capability (對比Commercial-temperature plastic-package comparators)
- Low input bias with ceramic-package construction (對比Surface-mount comparators using different packages)
設計說明
Do not treat the 2 mV input offset voltage as a usable measurement resolution near the switching threshold. Add hysteresis where the input can cross slowly, and keep the comparison excursion comfortably above that offset. The 7 ns propagation delay is excellent for timing, but it does not remove errors caused by input noise, reference drift, or slow slope noise at the threshold.
Route the two comparison inputs as a compact, balanced pair and keep them away from switching nodes and high-current return paths. Place input-referring and bypass components close to their associated pins, and verify the pin functions against the manufacturer pin-description table before layout release. The 16-pin ceramic package requires adequate clearance for through-hole assembly and for the mechanical tolerances of legacy boards.
Budget for the 35 mA operating supply current and add margin for output loading, temperature, and component tolerance when designing the supply. Decouple the device close to its supply pins, and confirm the permitted supply range and capacitor recommendations in the manufacturer application information. Treat the resulting dissipation as a thermal-design item when the device operates in a sealed or elevated-temperature enclosure.
合規資訊
The available manufacturer and distributor listings identify the package and operating-temperature characteristics but do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The -55°C to +125°C rating describes temperature capability, not AEC-Q100 qualification.
