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PDF MAX3406 Data sheet ( Hoja de datos )
| Número de pieza | MAX3406 | |
| Descripción | (MAX3406 - MAX3408) Switchable Termination Networks | |
| Fabricantes | Maxim Integrated Products | |
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19-2141; Rev 0; 8/01
75Ω/100Ω/120Ω Switchable Termination
Networks
General Description
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 75Ω, 100Ω, and 120Ω. The MAX3406
can switch from 75Ω to 100Ω, the MAX3407 can switch
from 75Ω to 120Ω, and the MAX3408 can switch from
100Ω to 120Ω termination. Termination resistance val-
ues are guaranteed to ±2.5% through -40°C to +85°C
and for signal levels of ±3.6V.
The MAX3406/MAX3407/MAX3408 consume only 50µA
supply current and are fully specified for operation from
a +4.5V to +5.5V power supply. These devices are avail-
able in a tiny 5-pin SOT23 package. All specifications
are guaranteed over the extended temperature range of
-40°C to +85°C.
Features
o Available in 5-Pin SOT Package
o ±2.5% Resistance Accuracy Over Extended
Temperature Range
o -3.6V to +3.6V Input Voltage Range
o 50µA Supply Current (max)
o Bipolar Input Range Off a Single Supply
o Switchable Termination
75Ω or 100Ω (MAX3406)
75Ω or 120Ω (MAX3407)
100Ω or 120Ω (MAX3408)
Applications
Telecom E1/T1/J1 Coax/Twisted Pair Termination
Data Routers
Telecom Racks
Video Security
Industrial Networks
Ethernet Networks
Ordering Information
PART
MAX3406EUK
MAX3407EUK
MAX3408EUK
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
5 SOT23-5
5 SOT23-5
5 SOT23-5
TOP
MARK
ADSV
ADSW
ADSX
TOP VIEW
Pin Configuration
VCC 1
5A
GND 2
ENABLE 3
MAX3406
MAX3407
MAX3408
4B
SOT23-5
PART
MAX3406EUK
MAX3407EUK
MAX3408EUK
Selector Guide
TERMINATION
ENABLE = 1
ENABLE = 0
75Ω 100Ω
75Ω 120Ω
100Ω
120Ω
________________________________________________________________ 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.
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75Ω/100Ω/120Ω Switchable Termination
Networks
Table 1. Termination Mode Selection
PART
MAX3406EUK
MAX3407EUK
MAX3408EUK
RAB (Ω)
ENABLE = 1
75
75
100
RAB (Ω)
ENABLE = 0
100
120
120
ENABLE
MAX3406
MAX3407
A MAX3408
VCC
R1
B
R2
GND
Figure 1. Simplified Block Diagram
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.
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 -40°C to
+85°C range centered at +25°C, this would be a ±1%
change in resistance. The initial accuracy at room tem-
perature is ±1.5%. This provides improved perfor-
mance over discrete 5% resistors with a 100ppm temp-
co, which are typically used for termination, ±5.6%
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.
Resistance vs. Input Voltage Range
The MAX3406/MAX3407/MAX3408 accept input volt-
ages (VAB) from -3.6V to +3.6V. There is virtually no
resistance variation over this range (0.02% typically).
The initial accuracy specifications in the data sheet
already account for resistance variations of the signal
voltage range.
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.
Decoupling VCC
The VCC pin for the MAX3406/MAX3407/MAX3408 must
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.
Chip Information
TRANSISTOR COUNT: 102
PROCESS: BiCMOS
_______________________________________________________________________________________ 5
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| PDF Descargar | [ Datasheet MAX3406.PDF ] | |
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