In precision signal chain design, the on-resistance flatness, switching speed, and power consumption of analog switches often directly determine the system’s linearity and the upper limit of the signal-to-noise ratio. ADI’s ADG419 is an LC²MOS precision single-pole double-throw (SPDT) switch specifically designed to address these challenges: it features an on-resistance of less than 35 Ω, power consumption in the microwatt range, a switching time as fast as 160 ns, and an extremely flat on-resistance curve across the entire analog input range. For procurement professionals and engineers seeking ADG419 in stock and looking to shorten lead times, Mingjiada Electronics’ permanent stock of genuine, brand-new products provides an efficient path from selection to delivery—2,500 brand-new, genuine ADG419BRZ units are currently in stock (lot numbers 26+), with lead times reduced to 1 to 3 days.
I. ADG419 Key Parameters at a Glance
Switch Configuration: Single-Pole Double-Throw (SPDT), 1 channel
On-Resistance (RON): Typical 25 Ω, Maximum <35 Ω
On-Resistance Flatness: Extremely flat across the entire analog input range, ensuring low distortion
Maximum Supply Voltage: 44 V
Analog Signal Range: VSS to VDD (rail-to-rail)
Power Dissipation: < 35 μW
Switching Time: 160 ns (maximum)
Switching Action: Break-before-make
Power Supply: Single or dual power supplies; fully specified at 12 V single supply
Operating Temperature Range: −40°C to +85°C (Standard Grade); −55°C to +125°C (Military/EP Grade)
Package Options: PDIP-8, MSOP-8, SOIC-8, CerDIP-8
Pin-Compatible Replacement: Direct replacement for the DG419; fully pin- and package-compatible
II. Why the ADG419 Is a Reliable Choice for Precision Signal Switching
Low charge injection and low leakage current enabled by the LC²MOS process. The ADG419 is manufactured using an enhanced LC²MOS process, which maintains high switching speeds while keeping charge injection and off-state leakage current at low levels. For sample-and-hold circuits, high-impedance sensor front ends, and multi-channel ADC acquisition systems, this translates to lower glitch errors and more stable DC accuracy.
On-resistance flatness is superior to simply “low on-resistance.” In many precision applications, the absolute value of on-resistance can be compensated for through system calibration, but the nonlinearity of on-resistance as it varies with the input signal directly introduces distortion. The ADG419’s on-resistance curve is exceptionally flat across the entire analog input range, giving it a substantial advantage in linearity-sensitive scenarios such as audio signal routing and precision attenuation/gain switching.
“Open-before-close” operation eliminates the risk of inter-channel short circuits. If an SPDT switch closes before opening during the switching instant, it may briefly short-circuit two signal sources at different potentials. The ADG419 incorporates “open-before-close” operation, which completely disconnects the current channel before connecting the target channel during the switching process, thereby eliminating this risk at the switch level.
Flexible adaptation to single- or dual-supply configurations. The ADG419 can process bipolar analog signals under a ±15 V dual-supply configuration (with a signal range from VSS to VDD) or operate with unipolar signals under a single 12 V supply, thereby reducing the complexity of system power supply design.
III. Typical Application Scenarios
ADI officially lists the target applications for the ADG419 as precision test equipment, precision instruments, battery-powered systems, and sample-and-hold systems. In these scenarios, the common selection criterion is that signal amplitudes may approach the power supply rails, while the system is sensitive to both distortion and power consumption.
Specifically, the ADG419 is commonly used in:
Multi-channel ADC front-end switching: In systems such as weather monitoring and industrial data acquisition, multiple sensor signals are sequentially routed to programmable-gain amplifiers or ADCs.
Sample-and-hold circuits: Leveraging low charge injection and “break-before-make” characteristics to achieve clean signal isolation between the sampling and holding phases.
Battery-powered portable instruments: With microwatt-level quiescent power consumption, the ADG419 does not drain the battery life of portable devices.
Programmable gain/attenuation networks: Switching between different feedback resistors or attenuation branches in front-end circuits for precision weighing, strain measurement, and similar applications.
Plug-and-play upgrade for the DG419: Existing DG419 designs can be directly replaced with the ADG419 to achieve lower power consumption and improved on-resistance flatness without modifying the PCB layout.
Mingjiada Electronics · ADG419 Stock Inquiry Channel
Phone: +86 13410018555 / 0755-83294757
Email: sales@hkmjd.com
Address: 1239-1241, New Asia Guoli Building, Zhenzhong Road, Futian District, Shenzhen
Company Website: www.integrated-ic.com
Người liên hệ: Mr. Sales Manager
Tel: 86-13410018555
Fax: 86-0755-83957753
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