MAX3406EUK-T [MAXIM]
Terminator, 1-Line, 100ohm, BICMOS, PDSO5, SOT-23, 5 PIN;型号: | MAX3406EUK-T |
厂家: | MAXIM INTEGRATED PRODUCTS |
描述: | Terminator, 1-Line, 100ohm, 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 | 下载: | 下载PDF数据表文档文件 |
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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