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MPA4609

SBOS252E – AUGUST 2002 – REVISED DECEMBER 2008

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Copyright © 2002-2008, Texas Instruments Incorporated

Quad, Differential I/O, 2X1 Multiplexed

High Gain Preamp

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

FEATURES

q 4 DIFFERENTIAL OUTPUT CHANNELS

q 2 SETS OF 4 DIFFERENTIAL INPUTS

q 90MHz BANDWIDTH UP TO 3.5V

q GAIN OF 190V/V (No External Load)

q LOW 0.65nV/

q 50mA QUIESCENT CURRENT (5V Supply)

q LOW CROSSTALK, TQFP-48 PACKAGING

q TTL/CMOS CHANNEL SELECT LINE

APPLICATIONS

q TAPE PREAMP

q TEST EQUIPMENT

q MULTI-CHANNEL TWISTED PAIR RECEIVER

q SAW FILTER POSTAMPLIFIER

q HIGH GAIN QUAD ADC DRIVERS

q ULTRA SOUND PRE-AMPLIFIERS

MPA

4609

PART NUMBER

DESCRIPTION

OPA2846

Dual, Low-Noise Op Amp

ADS5121

Octal, 10-Bit 40MSPS ADC

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DESCRIPTION

The MPA4609 is one of the lowest noise, fixed gain, 5V

single-supply, differential amplifiers available for amplifica-

tion of low-level signals in a variety of system applications.

The chip 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.

The quad consists of eight differential low noise (0.65nV

√Hz)

voltage preamps. Two select lines control two pairs of inputs.

Each of the output stages provides a nominal 470

Ω-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 out-

puts. For example, adding an external 940

Ω 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 maxi-

the 2.1V bias level. A low input offset voltage and bias

current offset holds the maximum output differential offset to

<

±350mV for no-load conditions.

The low (3.5pF) input capacitance makes this part useable

for applications requiring wide bandwidth and multiple pick-

ups often seen in testers, medical equipment, twisted pair

receivers, and optical systems. The single +5V supply and its

low quiescent current of 50mA make it exceptionally attrac-

tive in multi-channel, low power, high bandwidth designs.

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PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.