MPA4609IPFBT

Overview

The MPA4609IPFBT is a quad, differential I/O, 2x1 multiplexed high gain preamplifier manufactured by Texas Instruments. It features four differential output channels and two sets of four differential inputs controlled by TTL/CMOS channel select lines. The device operates on a single +5V supply with a quiescent current of 50mA. It provides a nominal open-load gain of 190V/V and a bandwidth of 90MHz up to 3.5Vpp output. Key electrical characteristics include a low input noise voltage of 0.65nV/√Hz, an input offset voltage of ±0.8mV maximum, and a differential slew rate of 150V/µs. The component is housed in a TQFP-48 package.

Feature Summary

• Integrates eight differential low-noise voltage preamps arranged into four output stages with internal common-mode biasing.
• Features dual logic-controlled channel select lines for switching between forward and reverse input pairs.
• Provides fixed high gain with adjustable attenuation capability via external load resistors connected across differential outputs.
• Includes internal bandgap reference for stable DC biasing and low input capacitance for wide bandwidth applications.

Applications

• Tape preamplifiers
• Multi-channel twisted pair receivers
• High gain quad ADC drivers
• Ultra sound pre-amplifiers

Procurement Notes

Verify the specific ordering suffix IPFBT corresponds to the Tape and Reel packaging quantity of 250 units as documented in the manufacturer's data sheet. Confirm that the temperature range specification aligns with the industrial grade requirements of the target application environment. Ensure compatibility with the required TQFP-48 footprint during PCB layout validation.

Selection Notes

Select this component for designs requiring high gain and low noise in a compact multi-channel configuration. The fixed 190V/V gain simplifies circuit design but requires attention to input signal levels to avoid saturation. Consider the 50mA quiescent current for power budget calculations. The TTL/CMOS compatible control interface facilitates direct connection to standard digital logic sources without additional level shifting.

Part Context

This part belongs to the MPA4609 family of high-gain preamplifiers designed for low-level signal amplification. It serves as a specialized solution for systems needing multiple differential channels with integrated multiplexing capabilities. The device complements other Texas Instruments precision amplifiers by offering a fixed-gain, high-bandwidth alternative to configurable op-amp solutions.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.

FAQ

How is the channel selection implemented?

Channel selection is managed by two TTL/CMOS compatible pins (Pin 3 and Pin 34). A voltage below 0.9V selects the reverse channels, while a voltage above 1.6V selects the forward channels.

What is the method for adjusting the amplifier gain?

The nominal gain of 190V/V can be attenuated by adding an external load resistor between the differential output pins. For instance, a 940Ω resistor reduces the gain by half to 95V/V.

What is the typical switching time for the channel select?

The channel switching time is typically 50ns, allowing for rapid transitions between the forward and reverse input sets.