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MAX3407EUK-T [MAXIM]

Terminator, 1-Line, 120ohm, BICMOS, PDSO5, SOT-23, 5 PIN;
MAX3407EUK-T
型号： MAX3407EUK-T
厂家： MAXIM INTEGRATED PRODUCTS    MAXIM INTEGRATED PRODUCTS
描述：

Terminator, 1-Line, 120ohm, BICMOS, PDSO5, SOT-23, 5 PIN

信息通信管理 光电二极管 接口集成电路
文件： 总6页 (文件大小：128K)
中文：  中文翻译
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19-2141; Rev 0; 8/01  
75 /100 /120 Switchable Termination  
Networks  
General Description  
Features  
The MAX3406/MAX3407/MAX3408 are general-purpose  
line-terminating networks designed to change the termi-  
nation value of a line, depending on the state of a digi-  
tal control line, allowing the connection to a coaxial  
cable or a twisted pair wire. These devices are switch-  
able between 75 , 100 , and 120 . The MAX3406  
can switch from 75 to 100 , the MAX3407 can switch  
from 75 to 120 , and the MAX3408 can switch from  
100 to 120 termination. Termination resistance val-  
ues are guaranteed to 2.5ꢀ through -40ꢁ° to ꢂ85ꢁ°  
and for signal levels of 3.6ꢃ.  
ꢀ Available in 5-Pin SOT Package  
ꢀ ±±25ꢀ ꢁeꢂiꢂsance Accꢃuacꢄ Oveu ꢅEsenꢆeꢆ  
Tempeuasꢃue ꢁange  
ꢀ -326V so +326V Inpꢃs Volsage ꢁange  
ꢀ 50µA Sꢃpplꢄ Cꢃuuens (maE)  
ꢀ Bipolau Inpꢃs ꢁange Off a Single Sꢃpplꢄ  
ꢀ Swischable Teuminasion  
75 ou 100 (MAX3406)  
75 ou 1±0 (MAX3407)  
100 ou 1±0 (MAX3408)  
The MAX3406/MAX3407/MAX3408 consume only 50µA  
supply current and are fully specified for operation from  
a ꢂ4.5ꢃ to ꢂ5.5ꢃ power supply. These devices are avail-  
able in a tiny 5-pin SOT23 package. All specifications  
are guaranteed over the extended temperature range of  
-40ꢁ° to ꢂ85ꢁ°.  
Applications  
Ordering Information  
Telecom E1/T1/J1 °oax/Twisted Pair Termination  
TꢅMP2  
ꢁANGꢅ  
PIN-  
PACKAGꢅ  
TOP  
MAꢁK  
PAꢁT  
Data Routers  
Telecom Racks  
-40 C to +85 C  
-40 C to +85 C  
-40 C to +85 C  
MAX3406EUK  
MAX3407EUK  
MAX3408EUK  
5 SOT23-5  
5 SOT23-5  
5 SOT23-5  
ADSV  
ADSW  
ADSX  
ꢃideo Security  
Industrial Networks  
Ethernet Networks  
Selector Guide  
Pin Configuration  
TOP VIEW  
TꢅꢁMINATION  
PAꢁT  
ꢅNABLꢅ = 1  
ꢅNABLꢅ = 0  
V
1
2
3
5
4
A
B
CC  
75  
75  
100  
120  
120  
MAX3406EUK  
MAX3407EUK  
MAX3408EUK  
MAX3406  
MAX3407  
MAX3408  
100  
GND  
ENABLE  
SOT±3-5  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
75 /100 /120 Switchable Termination  
Networks  
ABSOLUTꢅ MAXIMUM ꢁATINGS  
(All voltages referenced to GND unless otherwise noted.)  
V
...........................................................................-0.3V to +6V  
Operating Temperature Range ...........................-40ꢁC to +85ꢁC  
Maximum Junction Temperature .....................................+150ꢁC  
Storage Temperature Range.............................-65ꢁC to +150ꢁC  
Lead Temperature (soldering, 10s) .................................+300ꢁC  
CC  
ENABLE......................................................-0.3V to (V  
A, B (applied individually) ...........................................-4V to +4V  
Differential Voltage Across A-B...................................-4V to +4V  
+ 0.3V)  
CC  
Continuous Power Dissipation (T = +70ꢁC)  
A
5-Pin SOT23 (derate 7.1mW/ꢁC above +70ꢁC)..........571mW  
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.  
ꢅLꢅCTꢁICAL CHAꢁACTꢅꢁISTICS  
(V  
= +4.5V to +5.5V, T =T  
A
to T  
, unless otherwise noted. Typical values are at V  
= +5V, T = +25ꢁC.) (Note 1)  
CC A  
CC  
MIN  
MAX  
PAꢁAMꢅTꢅꢁ  
SYMBOL  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
DC CHAꢁACTꢅꢁISTICS  
Supply Range  
V
4.5  
5.5  
50  
V
CC  
V
= +5.5V,  
CC  
Supply Current  
I
30  
µA  
CC  
ENABLE = 0 or V  
CC  
TꢅꢁMINATOꢁ NꢅTWOꢁK  
MAX3406  
97.5  
117  
100  
120  
100  
120  
102.5  
123  
-3.6V < V < ,+3.6V,  
AB  
ENABLE = 0  
MAX3407/  
MAX3408  
MAX3406  
-3.6V < V < +3.6V,  
AB  
ENABLE = 0,  
frequency up to 36MHz  
MAX3407/  
MAX3408  
On-Resistance  
R
ON  
MAX3406/  
MAX3407  
73.1  
97.5  
75  
100  
75  
76.9  
-3.6V < V < +3.6V,  
AB  
ENABLE = 1  
MAX3408  
102.5  
MAX3406/  
MAX3407  
-3.6V < V < +3.6V,  
AB  
ENABLE = 1, frequency  
up to 36MHz  
MAX3408  
100  
50  
Turn-On Time  
t
µs  
µs  
V
ON  
Turn-Off Time  
t
50  
OFF  
Input Low Voltage  
Input High Voltage  
Input Current  
V
0.8  
1
IL  
V
2.0  
-1  
V
IH  
I , I  
IL IH  
ENABLE = 0 or V  
µA  
mV  
CC  
Input Hysteresis  
V
200  
HYST  
Nose 1: All parameters tested at +25ꢁC. Limits through temperature are guaranteed by design.  
±
_______________________________________________________________________________________  
75 /100 /120 Switchable Termination  
Networks  
Typical Operating Characteristics  
(V = +5V, T = +25ꢁC, unless otherwise noted.)  
CC  
A
RESISTANCE vs. TEMPERATURE  
(MAX3406)  
RESISTANCE vs. TEMPERATURE  
(MAX3407)  
RESISTANCE vs. TEMPERATURE  
(MAX3408)  
110  
100  
90  
130  
120  
110  
100  
90  
130  
125  
120  
115  
110  
105  
100  
95  
ENABLE = 0  
ENABLE = 0  
ENABLE = 0  
ENABLE = V  
CC  
ENABLE = V  
CC  
80  
ENABLE = V  
CC  
80  
70  
70  
60  
60  
90  
-50  
-25  
0
25  
50  
75  
100  
-50  
-25  
0
25  
50  
75  
100  
-50  
-25  
0
25  
50  
75  
100  
TEMPERATURE ( C)  
TEMPERATURE ( C)  
TEMPERATURE ( C)  
RESISTANCE vs. INPUT VOLTAGE  
(MAX3406)  
RESISTANCE vs. INPUT VOLTAGE  
(MAX3407)  
RESISTANCE vs. INPUT VOLTAGE  
(MAX3408)  
120  
110  
100  
90  
130  
120  
110  
100  
90  
130  
125  
120  
115  
V
B
= 0  
V
B
= 0  
V
B
= 0  
ENABLE = 0  
ENABLE = 0  
ENABLE = 0  
ENABLE = V  
110  
105  
100  
95  
ENABLE = V  
CC  
CC  
ENABLE = V  
CC  
80  
80  
70  
70  
60  
60  
90  
-3.6  
-2.4 -1.2  
0
1.2  
2.4  
3.6  
-3.6  
-2.4 -1.2  
0
1.2  
2.4  
3.6  
-3.6  
-2.4 -1.2  
0
1.2  
2.4  
3.6  
V
AB  
(V)  
V
AB  
(V)  
V
AB  
(V)  
IMPEDANCE vs. FREQUENCY  
100 MODE—MAX3406/MAX3408  
IMPEDANCE vs. FREQUENCY  
120 MODE—MAX3407/MAX3408  
IMPEDANCE vs. FREQUENCY  
75 MODE—MAX3406/MAX3407  
MAX3406/7/8 toc08  
MAX3406/7/8 toc09  
MAX3406/7/8 toc07  
120  
100  
80  
60  
40  
20  
0
90  
60  
30  
0
140  
120  
100  
80  
90  
60  
30  
0
90  
75  
60  
45  
30  
15  
0
90  
60  
MAGNITUDE  
MAGNITUDE  
MAGNITUDE  
30  
0
PHASE  
PHASE  
PHASE  
-30  
-60  
-90  
60  
-30  
-60  
-90  
-30  
-60  
-90  
40  
20  
0.01  
0.1  
1
10  
100  
0.01  
0.1  
1
10  
100  
0.01  
0.1  
1
10  
100  
FREQUENCY (MHz)  
FREQUENCY (MHz)  
FREQUENCY (MHz)  
_______________________________________________________________________________________  
3
75 /100 /120 Switchable Termination  
Networks  
Typical Operating Characteristics (continued)  
(V = +5V, T = +25ꢁC, unless otherwise noted.)  
CC  
A
ACCURACY DISTRIBUTION  
75 MODE  
ACCURACY DISTRIBUTION  
100 MODE  
ACCURACY DISTRIBUTION  
120 MODE  
90%  
90%  
80%  
70%  
60%  
50%  
40%  
30%  
20%  
10%  
0%  
90%  
80%  
70%  
60%  
50%  
40%  
30%  
20%  
10%  
0%  
80%  
70%  
60%  
50%  
40%  
30%  
20%  
10%  
0%  
74.40 74.60 74.80 75.00 75.20 75.40 75.60  
98.8 99.2 99.6 100.0 100.4 100.8 101.2  
118.5 119.0 119.5 120.0 120.5 121.0 121.5  
RESISTANCE (  
)
RESISTANCE (  
)
RESISTANCE ( )  
Pin Description  
PIN  
1
NAMꢅ  
FUNCTION  
V
Supply Voltage +4.5V to +5.5V. Bypass to GND with a 0.1 F capacitor.  
Ground  
CC  
2
GND  
Digital Control Input. Drive ENABLE high to turn on the internal switch, pull ENABLE low to disable  
the internal switch.  
3
ENABLE  
4
5
B
A
Cable Terminator Terminal B  
Cable Terminator Terminal A  
Detailed Description  
Applications Information  
The MAX3406/MAX3407/MAX3408 are line-terminating  
networks. They provide 75 , 100 , and 120 termina-  
tion to be compatible with twisted pair or coaxial cable.  
The MAX3406/MAX3407/MAX3408 consume only 50µA  
supply current and operate from a +4.5V to +5.5V  
power supply. They are available in a space-saving 5-  
pin SOT23 package. All specifications are guaranteed  
over the extended temperature range of -40ꢁC to  
+85ꢁC.  
In order for the MAX3406/MAX3407/MAX3408 to termi-  
nate transmission lines correctly, they should look like a  
precision resistance. These devices look this way under  
all operating conditions as can be seen from the Typical  
Operating Characteristics. The very small variations in  
resistance with temperature, input voltage, and frequen-  
cy should not be of any concern in most applications,  
though the users should be aware of them. The next  
three sections describe these variations and explain  
what end application effect they could have.  
The ENABLE pin allows switching from one termination  
value to another: 75 to 100 for the MAX3406, 75 to  
120 for the MAX3407, and 100 to 120 for the  
MAX3408 (Figure 1 and Table 1).  
The function of a termination is to minimize line reflec-  
tions by terminating a transmission line in its character-  
istic impedance. The reflection coefficient for a line of  
Z0 characteristic impedance terminated with a given  
ZL is:  
Voltage Reflection Coefficient = (ZL - Z0)/(ZL + Z0)  
4
_______________________________________________________________________________________  
75 /100 /120 Switchable Termination  
Networks  
mance over discrete 5ꢀ resistors with a 100ppm temp-  
Table 12 Teuminasion Moꢆe Selecsion  
co, which are typically used for termination, 5.6ꢀ  
worst case. The reflections from such a mistermination  
are minimal and correspond to a worst-case reflection  
coefficient for the MAX3406/MAX3407/MAX3408 of  
0.015 or a -36dB return loss.  
ꢁ
( )  
ꢁ
( )  
AB  
AB  
PAꢁT  
ꢅNABLꢅ = 1  
ꢅNABLꢅ = 0  
MAX3406EUK  
MAX3407EUK  
MAX3408EUK  
75  
75  
100  
120  
120  
Resistance vs. Input Voltage Range  
The MAX3406/MAX3407/MAX3408 accept input volt-  
100  
ages (V ) from -3.6V to +3.6V. There is virtually no  
AB  
resistance variation over this range (0.02ꢀ typically).  
The initial accuracy specifications in the data sheet  
already account for resistance variations of the signal  
voltage range.  
ENABLE  
Impedance vs. Frequency  
As seen in the Typical Operating Characteristics, there  
is a slight impedance variation in the MAX3406/  
MAX3407/MAX3408 with frequency. The reactive com-  
ponents are parasitic inductance and capacitance  
associated with packaging, lead frame, and bond  
wires. These impedance components are very small up  
to frequencies above 20MHz. These parasitics are also  
similar to those that would be present with a discrete  
resistor terminator, and they can generally be ignored.  
These effects should be evaluated for applications with  
significant frequency content above 20MHz. This  
applies to sine wave sources above 20MHz and square  
and video sources above 8MHz. For all intended appli-  
cations, E1/T1, Standard Video, etc. they can be  
ignored.  
MAX3406  
MAX3407  
MAX3408  
A
V
CC  
R1  
R2  
B
GND  
Figure 1. Simplified Block Diagram  
Decoupling V  
CC  
The V  
pin for the MAX3406/MAX3407/MAX3408 must  
CC  
be decoupled with a 0.1µF ceramic capacitor to GND  
placed as close to the device as possible. This is  
required for proper operation of the part.  
This is the voltage that would be reflected from any line  
termination. As ZL becomes equal to Z0, this quantity  
becomes zero. Often this is expressed in dB and is  
called return loss. Reflection coefficient values less  
than 0.1 corresponding to a return loss of -20dB are  
generally seen as adequate. The MAX3406/MAX3407/  
MAX3408 will typically provide reflection coefficients  
below 0.01 or -40dB return loss.  
Chip Information  
TRANSISTOR COUNT: 102  
PROCESS: BiCMOS  
In most cases, Z0 and ZL are considered real resistive  
quantities and the result is a dimensionless scalar  
quantity, but the equation is valid in the complex case  
as well.  
Resistance vs. Temperature  
The MAX3406/MAX3407/MAX3408 resistance is con-  
stant over temperature. The typical temperature coeffi-  
cient of resistance is 150ppm/ꢁC. Over a -40ꢁC to  
+85ꢁC range centered at +25ꢁC, this would be a 1ꢀ  
change in resistance. The initial accuracy at room tem-  
perature is 1.5ꢀ. This provides improved perfor-  
_______________________________________________________________________________________  
5
75 /100 /120 Switchable Termination  
Networks  
Package Information  
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.  
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600  
© 2001 Maxim Integrated Products  
Printed USA  
is a registered trademark of Maxim Integrated Products.  

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