DG407CJ+ - Dual 8:1 CMOS Analog Multiplexer, 100 Ohm | ADI
料号： DG407CJ+ ✓ 量产中DG407CJ+ 概述
An analog multiplexer is a type of analog switch IC that selects one of several input signals and routes it to a single output under digital control. In the broader signal-chain hierarchy, the multiplexer sits between sensors or signal sources and amplifiers or ADCs, functioning as the routing element of data acquisition and instrumentation systems. The DG407 belongs to the CMOS analog multiplexer switch IC family alongside related devices such as the DG406 (16:1 single-ended version).
Key features include guaranteed channel-to-channel on-resistance matching of 8 ohm max, on-resistance flatness of 9 ohm max over the specified signal range, and bidirectional signal conduction - the switches conduct equally well in either direction. The redesigned DG406/DG407 family from Maxim (now Analog Devices) improved matching and flatness over earlier CMOS multiplexer generations, which directly reduces signal-path distortion and channel-to-channel gain error in precision systems.
Technically, the DG407 uses CMOS transmission-gate switch elements driven by internal TTL/CMOS-compatible logic decoding, allowing either supply configuration commonly used in industrial analog front ends. Break-before-make switching prevents momentary shorting of two selected channels during address transitions, an important behavior for measurement integrity.
Typical applications include differential data acquisition systems, precision test and measurement instrumentation, industrial process-control front ends, and audio or telemetry signal routing where a low 100 ohm max on-resistance preserves signal amplitude with typical load impedances.
A key design consideration: on-resistance of 100 ohm forms a divider with the load impedance, so keep load resistance at least 100x higher (10 megaohm or appropriate buffering) to limit gain error, and verify logic-level compatibility with your controller supply rails.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： DG407CJ+ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
DG407DJ
✅ 直接替换📋 参考替代料（不在目录中）
DG407CJ+ 规格参数
| Product Type | Dual 8:1 CMOS Analog Multiplexer |
| Number of Circuits | 2 |
| 通道数 | 8:1 (differential) |
| On-Resistance (Max) | 100 ohm |
| On-Resistance Matching (Max) | 8 ohm |
| On-Resistance Flatness (Max) | 9 ohm |
| Technology | CMOS |
| Signal Conduction | Bidirectional |
| 封装 | PDIP-28 |
| 安装类型 | Through Hole |
| 1ku List Price | USD 7.77 (per Analog Devices product page) |
DG407CJ+ pdip-28 引脚配置指南
DG407CJ+（pdip-28 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： DG407CJ+.
请参阅 数据手册 以查看完整引脚配置。
典型应用
DG407CJ+ 适用于 6 应用s: Differential Data Acquisition Front Ends, Precision Test and Measurement Instrumentation, Industrial Process Control Signal Routing, Audio and Telemetry Signal Routing, Automated Test Equipment (ATE) Channel Multiplexing, Legacy Board Redesign and Obsolescence Recovery.
Differential Data Acquisition Front Ends
The DG407CJ+ fits differential data acquisition because its two independent 8:1 switch circuits route a signal pair (positive and negative, or signal and guard) simultaneously, preserving the common-mode rejection that a single-ended multiplexer would destroy. With a maximum on-resistance of 100 ohm and channel matching of 8 ohm max, gain error remains small when the multiplexer feeds a high-impedance instrumentation amplifier input, and matching errors stay consistent across all eight channel pairs, simplifying system calibration. In a typical circuit, the DG407CJ+ sits between the sensor or terminal-block inputs and a programmable-gain instrumentation amplifier ahead of the ADC; break-before-make switching during address changes prevents momentary shorts between two selected channel pairs, protecting measurement integrity. Because the switches conduct equally well in both directions, the same device can also be used in the de-multiplex direction for calibration signal injection.
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Precision Test and Measurement Instrumentation
Bench instruments, automated test equipment, and data loggers frequently need to switch between many differential measurement points, and the DG407CJ+ provides eight differential channels per device with a 100 ohm max on-resistance that introduces predictable, low insertion loss into measurement paths. The redesigned DG406/DG407 family's guaranteed channel-to-channel matching of 8 ohm max and flatness of 9 ohm max mean that switching channels does not visibly change measurement gain, which is essential for accuracy specs across a scanner card. In practice the multiplexer is placed between input protection circuitry and the instrument's buffer amplifier; CMOS transmission-gate construction keeps the on-resistance reasonably flat over the signal range, limiting harmonic distortion of AC measurements. The through-hole PDIP-28 package also suits prototype and service-friendly instrument designs where sockets allow easy channel-expander replacement and field repair without hot-air rework.
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Industrial Process Control Signal Routing
Industrial control cabinets aggregate dozens of 4-20 mA transmitters, thermocouples, and voltage signals, and the DG407CJ+ lets one precision measurement channel be time-shared across eight differential sensor pairs, cutting the cost of ADC channels. Its CMOS construction operates from the dual supply rails commonly present in industrial analog front ends, and the 100 ohm max on-resistance causes negligible error when switching into high-impedance conditioning amplifiers. The 8 ohm max channel matching keeps calibration tables uniform across input channels, reducing per-channel trimming effort during production. Because the part is available in through-hole PDIP-28, it suits the repairable, long-lifecycle nature of process-control hardware, and the improved family specification (flatness 9 ohm max) ensures stable accuracy as signals traverse the industrial common-mode range. Break-before-make action prevents transmitters from being momentarily shorted together during channel scans, protecting both the sensors and the measurement.
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Audio and Telemetry Signal Routing
In audio matrices, broadcast routing, and telemetry front ends, the DG407CJ+ switches stereo or balanced audio pairs because its two 8:1 circuits handle the left/right or plus/minus legs of a differential pair in a single device, guaranteeing matched 100 ohm max on-resistance in both legs. The redesigned family's 9 ohm max on-resistance flatness over the signal range limits gain modulation as the audio waveform swings, which directly reduces THD compared to older multiplexer generations with poorly specified flatness. When feeding a high-impedance buffer (for example a FET-input op-amp), the voltage divider formed by the 100 ohm switch resistance is negligible across typical 47k-100k audio load impedances. Break-before-make switching produces a brief open interval between source changes, which acts as a natural click suppressor when combined with a small output coupling capacitor, making clean source transitions without elaborate muting logic.
推荐
Automated Test Equipment (ATE) Channel Multiplexing
ATE stimulus/measurement matrices use the DG407CJ+ to time-share precision measurement resources across multiple device-under-test pins or test points. Two synchronized 8:1 circuits switch a differential measurement pair, so Kelvin-style sense routing to a single instrumentation amplifier is straightforward, and the 100 ohm max on-resistance contributes a small, calculable error when measuring through high-impedance probes. Channel matching of 8 ohm max means the system gain calibration remains valid regardless of which of the eight channel pairs is selected, an important property for production test reproducibility. The bidirectional conduction of the CMOS switches also allows the same hardware to inject calibration or stimulus signals in the reverse direction, simplifying self-test paths. The through-hole PDIP-28 package tolerates the frequent hardware changes typical of ATE development and allows socketed replacement when switch channels wear or need reconfiguration.
推荐
Legacy Board Redesign and Obsolescence Recovery
Many long-lived industrial and instrumentation boards were designed around the original Maxim DG407 in PDIP-28, and the improved DG407CJ+ (still in production per Analog Devices) lets service organizations repair or re-release those boards without PCB redesign: the J-suffix DIP-28 footprint is unchanged. Where a service stock of DG407CJ+ cannot be sourced, the pin-compatible Vishay Siliconix DG407DJ in the same 28-PDIP package serves as a drop-in substitute with the same dual 8:1, 100 ohm max specification, minimizing qualification effort to a pinout and parametric comparison rather than a full redesign. The improved family also brings benefit to the repair itself: channel matching of 8 ohm max and flatness of 9 ohm max equal or exceed the original device's performance, so board-level specifications are preserved. For surface-mount re-spins, the DG407CWI+T in wide SOIC covers the same function with a footprint change.
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推荐产品汇总
工程参考数据： DG407CJ+ ——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 | DG407DJ | DG407CWI+T |
|---|---|---|---|
| Package | PDIP-28 | PDIP-28 - same | SOIC-28 wide (different package) |
| Brand | Analog Devices (Maxim Integrated) | Vishay Siliconix | Analog Devices (Maxim Integrated) |
| Configuration | Dual 8:1 differential | Dual 8:1 (2 Circuit IC Switch) | Dual 8:1 differential |
| On-Resistance (Max) | 100 ohm | 100 ohm | 100 ohm |
| Technology | CMOS | CMOS | CMOS |
| Mounting Type | Through Hole | Through Hole | Surface Mount |
| Pin-Compatible Drop-In | - | Yes | No (different package) |
关键差异点
- Improved family matching specification （对比 DG407DJ)
- Drop-in cross-brand fallback available （对比 DG407DJ)
- Trade-off: through-hole package （对比 DG407CWI+T)
设计说明
The DG407CJ+ on-resistance of up to 100 ohm forms a voltage divider with the load impedance. Estimated: with a 100 kohm load, worst-case gain error is about 100/(100+100000) = 0.1%, but with a 10 kohm load it rises to roughly 1%, and channel-to-channel matching (8 ohm max) further limits how much of that error varies per channel. Always follow the multiplexer with a high-input-impedance buffer or instrumentation amplifier, and account for the flatness spec (9 ohm max) when the signal swings across the common-mode range in precision applications.
Break-before-make switching means a brief interval where no channel is connected; downstream sample-hold or ADC circuits must tolerate this open period, or add a small hold capacitor at the multiplexer output. Do not exceed the absolute maximum signal ranges relative to the supply rails - CMOS transmission gates conduct substrate-protection diodes when inputs fall outside the rails, which can latch or damage the device. Verify the address-input logic thresholds against your controller: supply configuration determines whether TTL or CMOS levels are required, so consult the manufacturer datasheet rather than assuming.
For the PDIP-28 through-hole footprint, keep the differential channel pairs' traces symmetrical and short to preserve common-mode rejection; ground the unused guard area around the multiplexer output trace to reduce leakage. Place decoupling capacitors (typically 0.1 uF ceramic per supply pin) close to the package and add bulk capacitance on the analog supply. If the board may later migrate to the wide-SOIC DG407CW variant, consider a universal footprint pattern supporting both DIP-28 and SOIC-W-28 to avoid a future re-spin.
合规信息
RoHS/lead-free status could not be confirmed from provided data; verify on the official Analog Devices DG407 product page. Automotive compliance not indicated - a third-party listing suggested ADG5208BCPZ for automotive-qualified needs.
