AD8174ARZ

Specialized Overview

The AD8174ARZ is a high-speed buffered multiplexer integrating four analog switches and a current feedback output amplifier in a 14-lead SOIC package. It provides a 250 MHz small-signal bandwidth with a slew rate exceeding 1000 V/μs. The device operates on a ±5 V supply, consuming approximately 9.7 mA quiescent current. Key electrical parameters include a channel-to-channel switching time of 7.5 ns, an enable turn-on time of 17 ns, and a disable isolation of -88 dB at 5 MHz. The output amplifier delivers up to 50 mA drive current.

Specialized Feature Summary

• Integrates four input channels with a single high-speed current feedback output amplifier for signal routing.
• Features a dedicated ENABLE pin that places the output into a high-impedance state to facilitate cascading multiple devices without loading the bus.
• Includes a SHUTDOWN (SD) function that significantly reduces power consumption by cutting off internal bias currents when the device is inactive.
• Provides excellent video performance specifications including low differential gain error and minimal phase distortion.

Specialized Applications

• Pixel switching for Picture-In-Picture implementations in LCD and plasma displays
• High-speed video routing systems requiring fast channel selection
• Cascaded multiplexer arrays utilizing the high-impedance disable feature

Specialized Procurement Notes

Verify the specific suffix 'ARZ' corresponds to the 14-lead Narrow SOIC package and the industrial temperature range of -40°C to +85°C. Confirm that the ENABLE and SHUTDOWN pins are utilized correctly in the design, as these functions are unique to the AD8174 variant compared to the AD8170. Ensure external feedback resistors match the recommended values for the desired gain configuration to maintain specified bandwidth and stability.

Specialized Selection Notes

Select the AD8174ARZ when a 4:1 multiplexing ratio is required alongside high-speed buffering capabilities. This component is suitable for applications demanding fast settling times and low crosstalk. Consider the AD8170 if only two channels are needed, noting it lacks the ENABLE and SHUTDOWN control features. Evaluate the need for external feedback resistors to set the closed-loop gain and optimize frequency response flatness.

Specialized Part Context

The AD8174 is part of the AD8170/AD8174 family of buffered multiplexers manufactured by Analog Devices. While the AD8170 offers a 2:1 configuration, the AD8174 expands this to 4:1 and adds digital control inputs for ENABLE and SHUTDOWN operations. Both devices share the same core current feedback amplifier architecture and video performance characteristics.

Specialized Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

Specialized FAQ

How does the AD8174 handle multiple devices connected to the same output bus?

The AD8174 includes an ENABLE pin. When driven high, it shuts off the output amplifier's supply current, placing the output in a high-impedance state. This allows multiple AD8174 outputs to be tied together without one device loading another.

What is the power consumption difference between normal operation and shutdown mode?

In normal operation with all channels ON, the quiescent current is typically 9.7 mA. When the SHUTDOWN (SD) pin is asserted high, the current drops to approximately 1.5 mA.

What determines the bandwidth of the AD8174ARZ?

The bandwidth is determined by the external feedback resistor network (RF and RG) connected to the current feedback amplifier. Specific resistor values are recommended in the datasheet to achieve optimal bandwidth and flatness for different gain settings.