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OPA2846 Datasheet

  • OPA2846

  • 雙路寬帶低噪聲電壓反饋運算放大器

  • 25頁

  • TI

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MPA4609
MP
A46
09
SBOS252D 鈥?AUGUST 2002 鈥?REVISED MARCH 2005
Quad, Differential I/O, 2X1 Multiplexed
High Gain Preamp
FEATURES
q
q
q
q
q
q
q
q
4 DIFFERENTIAL OUTPUT CHANNELS
2 SETS OF 4 DIFFERENTIAL INPUTS
90MHz BANDWIDTH UP TO 3.5V
PP
OUTPUT
GAIN OF 190V/V (No External Load)
LOW 0.65nV/
鈭?/div>
Hz INPUT NOISE VOLTAGE
50mA QUIESCENT CURRENT (5V Supply)
LOW CROSSTALK, TQFP-48 PACKAGING
TTL/CMOS CHANNEL SELECT LINE
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鈭欻z)
voltage preamps. Two select lines control two pairs of inputs.
Each of the output stages provides a nominal 470鈩?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鈩?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-
mum no-load differential output swing is 3.5V
PP
centered on
the 2.1V bias level. A low input offset voltage and bias
current offset holds the maximum output differential offset to
<
鹵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.
APPLICATIONS
q
q
q
q
q
q
TAPE PREAMP
TEST EQUIPMENT
MULTI-CHANNEL TWISTED PAIR RECEIVER
SAW FILTER POSTAMPLIFIER
HIGH GAIN QUAD ADC DRIVERS
ULTRA SOUND PRE-AMPLIFIERS
RELATED PARTS
PART NUMBER
OPA2846
ADS5121
DESCRIPTION
Dual, Low-Noise Op Amp
Octal, 10-Bit 40MSPS ADC
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.
All trademarks are the property of their respective owners.
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.
Copyright 漏 2002-2005, Texas Instruments Incorporated
www.ti.com

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