MPA4609

Power Supply ........................................................................................ +7V
Internal Power Dissipation ............................................................... 750mW
Differential Input Voltage ................................................................... ±1.2V
Input Voltage Range .................................................................. GND to +VS
Storage Temperature Range: PFB ................................. 40°C to +125°C
Junction Temperature (TJ) ............................................................... +150°C
Lead Temperature (soldering, 10s) ................................................ +300°C
ESD Rating (Human Body Model) ........................................................ 3000V
(Charge Device Model) ....................................................................... 1500V
(Machine Model) ................................................................................... 200V
NOTES: (1)
Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade
device reliability.

The MPA4609 is one of the lowest noise, fixed gain, 5V single-supply, differential amplifiers available for amplification of low-level signals in a variety of system applications. The MPA4609 has two sets of four differential input, low-noise amplifiers that are routed to four output stages. Two standard logic input select lines control which set of four input preamps are active. For applications such as tape recorders, four heads in forward and four heads in reverse can be selected at one time.

MPA4609 consists of eight differential low noise (0.65nVHz) voltage preamps. Two select lines control two pairs of inputs.  Each of the output stages provides a nominal 470-output impedance on each half of the differential output stages. The overall gain of 190V/V may be attenuated by adding an external load resistor between each set of differential outputs. For example, adding an external 940 resistor across the output pins will reduce the nominal differential gain by half to 95V/V.

Internal biasing controls the differential inputs to 2.0V and outputs to a 2.1V common-mode operating level. The maximum no-load differential output of MPA4609 swing is 3.5VPP centered on the 2.1V bias level. A low input of MPA4609 offset voltage and bias current offset holds the maximum output differential offset to < ±350mV for no-load conditions.

The low (3.5pF) input of MPA4609 capacitance makes this part useable for applications requiring wide bandwidth and multiple pickups often seen in testers, medical equipment, twisted pair receivers, and optical systems. The single +5V supply and its low quiescent current of 50mA make MPA4609 exceptionally attractive in multi-channel, low power, high bandwidth designs.