MAX4005CSA Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX4005CSA
950MHz FET-Input Buffer with 75 Output
_______________General Description
The MAX4005 is a ±5V, single-ended unity-gain buffer
with a high-impedance JFET input, intended to drive a
75Ωload. A 75Ωthin-film output resistor is included on-
board to minimize reflections when driving a 75Ωload
through a transmission line of arbitrary length. Gain in
this configuration is 0.5.
________________________Applications
Video Buffer / Line Driver
Isolation Between High-Impedance Node
and Low-Impedance Instrument
Remote Signal Sensing
Impedance Transformation
Fanout Multiplier for 75ΩDistribution Systems
____________________________Features950MHz Bandwidth350ps Rise/Fall Times0.11%/0.03°Differential Gain/Phase Error1000V/µs Slew Rate10pA Input Bias Current75ΩOutput Impedance
______________Ordering Information
MAX4005
950MHz FET-Input Buffer with 75ΩOutput
__________________Pin Configuration
__________Typical Operating Circuit
19-0315; Rev 0; 10/94
MAX4005
950MHz FET-Input Buffer with 75ΩOutput
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= 4.75V to 5.25V, VEE= -4.75V to -5.25V, TA= +25°C, stated performance characterized for TA= 0°C to +70°C, unless
otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Input Voltage.......................................................................±2.5V
VCCSupply Voltage............................................................+5.5V
Output-Stage Supply .........................................................+5.5V
VEESupply Voltage..............................................................-5.5V
Peaking Pad Voltage.............................................................0.0V
Ground Voltage.....................................................................0.0V
Continuous Power Dissipation (TA= +70°C)...................471mW
Operating Temperature Range...............................0°C to +70°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX4005
950MHz FET-Input Buffer with 75ΩOutput
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)0.3101001000
GAIN vs. FREQUENCY
MAX4005-01
FREQUENCY (kHz)
VOLTAGE GAIN (5dB/div)
-6dB
OUTPUT VOLTAGE (10mV/div)
TIME (2ns/div)
SMALL-SIGNAL STEP RESPONSE
MAX4005-02
OUTPUT VOLTAGE (20mV/div)
TIME (2ns/div)
SMALL-SIGNAL STEP RESPONSE
MAX4005-03
OUTPUT VOLTAGE (20mV/div)
TIME (2ns/div)
SMALL-SIGNAL STEP RESPONSE
vs. CAPACITIVE LOAD
MAX4005-04
THIRD-ORDER INTERCEPT
vs. FREQUENCY
MAX4005-05
FREQUENCY (MHz)
THIRD-ORDER INTERCEPT (dBm)
200300350400
__________Applications Information
Power Supply
The MAX4005 allows for two separate +5V supplies for
the output stage and the rest of the MAX4005 circuit. The
supplies are bonded out separately to give the option of
using a different +5V supply. The output stage is a Class
A type, with the output transistor fed by a current source
in the emitter, so its current will vary with output signal.
For best bandwidth and pulse response, solder bypass
chip capacitors directly from the supply pins on the four
corners of the package to a ground plane.
Input Impedance
The MAX4005 has a JFET input with an input capaci-
tance of only 2pF. As a result, the leakage current is
typically less than 10pA. This exceptionally high input
impedance is important in applications that require iso-
lation between a high source impedance and a low-
impedance transmission cable. An attenuator may be
used in front of the MAX4005 to increase the dynamic
range and reduce input capacitance.
Output Impedance
A 75Ωprecision thin-film output resistor is included on-
board to provide more precise reverse termination
than standard discrete resistors. This minimizes reflec-
tions caused by impedance mismatching when driving
transmission cable. The MAX4005 can also drive a
50Ωload with only a slight loss in amplitude (gain
drops from 0.5 to 0.4). The typical operating perfor-
mance specifications shown in the Electrical
Characteristicshave been verified with a 50Ωload, as
well as a 75Ωload.
Frequency Response Peaking
To peak the response to compensate for losses when
driving long transmission lines, connect a chip capaci-
tor of about 10pF to 50pF between the PEAK pin and
ground. This peaking occurs in the 200MHz to 500MHz
range. The PEAK pin will normally be left open for flat-
test response.
MAX4005
950MHz FET-Input Buffer with 75ΩOutput
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.

Partno	Mfg	Dc	Qty	Available	Descript
MAX4005CSA	MAX	N/a	283	avai	950MHz FET-Input Buffer with 75 Output