MPA4609IPFBRG4

Overview

The MPA4609IPFBRG4 is a quad, differential I/O, 2x1 multiplexed high gain preamplifier manufactured by Texas Instruments. It features two sets of four differential inputs routed to four output stages, selectable via TTL/CMOS compatible F/R 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 max, and a single-ended output impedance of 470Ω. The component is housed in a TQFP-48 package.

Feature Summary

• Integrates eight differential low-noise voltage preamps arranged into two selectable sets of four channels
• Provides fixed high gain amplification with internal biasing for direct interfacing to low-level signal sources
• Features fast channel switching capability between forward and reverse input pairs using standard logic control lines
• Includes internal common-mode reference and series output resistors to facilitate ADC driving and gain attenuation

Applications

• Tape preamplifiers for multi-head audio recording systems
• High-gain quad ADC drivers requiring wide bandwidth and low noise
• Multi-channel twisted pair receivers for communication systems
• Sonar and piezoelectric sensor signal conditioning
• Photodiode differential amplifier circuits

Procurement Notes

Verify the specific ordering suffix IPFBRG4 corresponds to the Tape and Reel packaging quantity of 2000 units as documented in the manufacturer's data sheet. Confirm that the PFB designator matches the TQFP-48 physical package dimensions required for your PCB layout. Ensure the temperature range specification aligns with your operational environment requirements before finalizing procurement.

Selection Notes

Select this component when designing systems requiring simultaneous amplification of multiple differential signals with minimal noise degradation. The integrated multiplexing functionality simplifies circuit topology for applications needing dual-input selection per channel. Consider the fixed 190V/V gain and 470Ω output impedance when determining external loading requirements for downstream analog-to-digital converters or transmission lines.

Part Context

The MPA4609 belongs to Texas Instruments' portfolio of specialized high-performance analog signal conditioning devices. It is distinct from general-purpose operational amplifiers due to its integrated multiplexing architecture and fixed high gain structure. This part is designed specifically for applications demanding high channel density and low noise performance in a single integrated circuit solution.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing designs by comparing pin configurations, electrical specifications, and thermal requirements against alternative components if substitution is necessary.

FAQ

How is the channel selection controlled?

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 maximum differential output swing?

The maximum no-load differential output swing is 3.5Vpp, centered on the 2.1V internal common-mode bias level.

Can the gain be adjusted externally?

Yes, the nominal gain of 190V/V can be attenuated by adding an external load resistor across the differential outputs. For example, a 940Ω resistor reduces the gain by half to 95V/V.