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19-0315; Rev 0; 10/94
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 75 load. A 75 thin-film output resistor is included onboard to minimize reflections when driving a 75 load through a transmission line of arbitrary length. Gain in this configuration is 0.5.
____________________________Features
o 950MHz Bandwidth o 350ps Rise/Fall Times o 0.11%/0.03 Differential Gain/Phase Error o 1000V/s Slew Rate o 10pA Input Bias Current o 75 Output Impedance
MAX4005
________________________Applications
Video Buffer / Line Driver Isolation Between High-Impedance Node and Low-Impedance Instrument Remote Signal Sensing Impedance Transformation Fanout Multiplier for 75 Distribution Systems
______________Ordering Information
PART MAX4005CSA TEMP. RANGE 0C to +70C PIN-PACKAGE 8 SO
__________Typical Operating Circuit
__________________Pin Configuration
TOP VIEW
-5V
1
8
-5V VEE 1 8 7 VEE PEAK OUT VCCO
MAX4005
INPUT 2 3 4
7 6 5
N.C. Z = 75 +5V OUT RL = 75
IN 2 GND 3 VCC 4
MAX4005
6 5
+5V
SO
________________________________________________________________ Maxim Integrated Products
1
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950MHz FET-Input Buffer with 75 Output MAX4005
ABSOLUTE MAXIMUM RATINGS
Input Voltage.......................................................................2.5V VCC Supply Voltage ............................................................+5.5V Output-Stage Supply .........................................................+5.5V VEE Supply Voltage..............................................................-5.5V Peaking Pad Voltage.............................................................0.0V Ground Voltage .....................................................................0.0V Continuous Power Dissipation (TA = +70C) ...................471mW Operating Temperature Range...............................0C to +70C Lead Temperature (soldering, 10sec) .............................+300C
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.
ELECTRICAL CHARACTERISTICS
(VCC = 4.75V to 5.25V, VEE = -4.75V to -5.25V, TA = +25C, stated performance characterized for TA = 0C to +70C, unless otherwise noted.) PARAMETER +5V VCC Current +5V Output Stage Quiescent Current -5V VEE Current Output Offset Voltage Output Resistance Input Current Gain Linearity Input Dynamic Range +5V VCC Power-Supply Rejection Ratio +5V Output Stage Power-Supply Rejection Ratio -5V VEE Power-Supply Rejection Ratio ROUT IB VIN = 0V RL = 75 RL = 75, measured over input dynamic range RL = 75, gain = 0.5 VIN = 0V, RL = 75 VIN = 0V, RL = 75 VIN = 0V, RL = 75 -1.3 40 50 40 SYMBOL IVCC1 IVCC2 IVEE CONDITIONS VIN = 0V, RL = 75 VIN = 0V, RL = 75 VIN = 0V, RL = 75 RL = 75, gain = 0.5 MIN 9 9 17 -3 74.0 -1 0.49 75.0 0.01 0.50 0.50 TYP 14 11 24 MAX 19 14 31 3 76.5 1 0.51 1 1.6 55 75 60 % V dB dB dB UNITS mA mA mA mV nA
TYPICAL OPERATING PERFORMANCE (VCC = 5.0V, VEE = -5.0V, RL = 75, TA = +25C, unless otherwise noted.) -3dB 950 Bandwidth BW -6dB 2000 Input Capacitance Settling Time to 0.1% Rise/Fall Times Gain Flatness Gain Flatness 0.1dB Gain Flatness 0.2dB Slew Rate Overdrive Recovery Time 2nd Harmonic Distortion 3rd Harmonic Distortion 3rd-Order Intercept Differential Gain Error Differential Phase Error CIN tSET GF GF1 GF2 SR tOD 2HD 3HD TOI DG DP VIN = 2.5V step with 200ps rise time VIN = 2.5V step At 50MHz At 50MHz At 100MHz At 3.58MHz At 3.58MHz VIN = 0.25V step, VOUT = 0.125V step At 30MHz tRISE/tFALL VIN = 0.25V step with < 30ps rise time 2.2 2 350 0.01 60 80 1000 5 -50 < -60 28 0.11 0.03
MHz pF ns ps dB MHz MHz V/s ns dBc dBc dBm % degrees
2
_______________________________________________________________________________________
950MHz FET-Input Buffer with 75 Output
__________________________________________Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
SMALL-SIGNAL STEP RESPONSE
MAX4005-01 MAX4005-02
MAX4005
GAIN vs. FREQUENCY
-3dB, 977MHz -6dB VOLTAGE GAIN (5dB/div)
SMALL-SIGNAL STEP RESPONSE
MAX4005-03
OUTPUT VOLTAGE (10mV/div)
tRISE = 340ps
OUTPUT VOLTAGE (20mV/div)
tRISE = 357ps
0.3 1
10
100
1000
TIME (2ns/div)
TIME (2ns/div)
FREQUENCY (kHz)
SMALL-SIGNAL STEP RESPONSE vs. CAPACITIVE LOAD
MAX4005-04
THIRD-ORDER INTERCEPT vs. FREQUENCY
THIRD-ORDER INTERCEPT (dBm) 35 30 25 20 15 10 5 0
MAX4005-05
40
OUTPUT VOLTAGE (20mV/div)
CL = 5.6pF CL = 10pF CL = 18pF CL = 33pF VIN = 200mV STEP RL = 75 TIME (2ns/div)
100
150
200
250
300
350
400
FREQUENCY (MHz)
_______________________________________________________________________________________
3
950MHz FET-Input Buffer with 75 Output MAX4005
_____________________Pin Description
PIN 1, 8 2 3 4 5 6 7 NAME VEE IN GND VCC VCCO OUT PEAK FUNCTION -5V Negative Supplies High-Impedance Input Ground +5V Positive Supply Output Stage +5V Positive Supply Output (ZOUT = 75) Normally no connection. Capacitor to ground will peak frequency response.
Input Impedance
The MAX4005 has a JFET input with an input capacitance 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 isolation between a high source impedance and a lowimpedance transmission cable. An attenuator may be used in front of the MAX4005 to increase the dynamic range and reduce input capacitance.
Output Impedance
A 75 precision thin-film output resistor is included onboard to provide more precise reverse termination than standard discrete resistors. This minimizes reflections caused by impedance mismatching when driving transmission cable. The MAX4005 can also drive a 50 load with only a slight loss in amplitude (gain drops from 0.5 to 0.4). The typical operating performance specifications shown in the Electrical Characteristics have been verified with a 50 load, as well as a 75 load.
__________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.
Frequency Response Peaking
To peak the response to compensate for losses when driving long transmission lines, connect a chip capacitor 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 flattest response.
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.
4 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1994 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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