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MAX3523ETP Datasheet(PDF) 11 Page - Maxim Integrated Products

No. de Pieza. MAX3523ETP
Descripción  Low-Power DOCSIS 3.1 Programmable-Gain Amplifier
Descarga  12 Pages
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Fabricante  MAXIM [Maxim Integrated Products]
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MAX3523ETP Datasheet(HTML) 11 Page - Maxim Integrated Products

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Applications Information
Power Codes
The device is designed to exceed the stringent linearity
requirements of DOCSIS 3.1 using power code (PC 3).
Using lower power codes (PC = 2, 1 or 0) allows for
operation at reduced current levels. The full range of gain
codes can be used in any power code. The gain difference
between power codes is typically less than 0.1dB.
Transmit Disable Mode
Between bursts in a DOCSIS system, the MAX3523 can
be put in transmit-disable mode by setting TXEN low.
The output transient on the cable is kept well below the
DOCSIS 3.1 requirement during the TXEN transitions.
If a gain code or power code change is required, the new
values of PC and GC should be clocked in during transmit-
disable mode (TXEN low). The new operating point of
the MAX3523 is set on the 12th rising edge of SCLK. This
should be done between transmission bursts.
Output Circuit
The output circuit is an open-drain differential amplifier. The
outputs should be resistively terminated, as shown in the
TypicalApplication Circuit.A50:75 impedance ratio transformer
should be used as the interface between the differential output
of the device and the unbalanced 75Ω load.
Amplifier performance depends on the value of the
termination resistors. Rated performance is obtained
using the R7 termination resistor as shown in the Typical
Application Circuit. Increasing the value of this resistor will
increase gain and improve SNR at the expense of output
return loss.
Transformer core inductance may vary with temperature.
Adequate primary inductance must be present to sustain
broadband output capability as temperatures vary.
Input Circuit
The differential input impedance of the MAX3523 is
200Ω. In a typical application, however, it is driven from a
100Ω differential source, requiring an external 200Ω matching
resistor, as shown in the Typical Application Circuit.
The device has sufficient gain and linearity to produce an
output level of +68dBmV when driven with a +31dBmV input
signal. If an input level greater than +31dBmV is used, the
3rd-order distortion performance degrades.
Layout Issues
A well-designed printed circuit board (PCB) is an essential
part of an RF circuit. For best performance, pay attention
to power-supply layout issues as well as the output circuit
layout. The MAX3523 evaluation (EV) board layout can
be utilized as a guide during PCB design. Its electrical
performance has been thoroughly tested, making it an
excellent reference. Refer to the MAX3523 EV kit for
additional information.
Output Circuit Layout
Keep the length of the output traces as short as
possible. Series inductance between the part and the
transformer will degrade the performance at the higher
end of the operating frequency range. To maintain the
balance of the output network, match the length of the
differential traces as closely as possible.
Power-Supply Layout
For minimal coupling between different sections of the
IC, the ideal power-supply layout is a star configuration.
This configuration has a large-value decoupling capacitor at
the central power-supply node. The power-supply traces
branch out from this node, each going to a separate
power-supply node in the circuit. At the end of each of
these traces is a decoupling capacitor that provides a
very low impedance at the frequency of interest. This
arrangement provides local power-supply decoupling at
each power-supply pin. The power-supply traces must be
capable of carrying the maximum current without signifi-
cant voltage drop.
Exposed Pad Thermal Considerations
The exposed pad (EP) of the MAX3523's 20-pin TQFN
package provides a low thermal resistance path to the
die. It is important that the PCB on which the device is
mounted be designed to conduct heat from this contact.
In addition, the EP should be provided with a low-induc-
tance path to electrical ground. The MAX3523 EV board
is an example of a layout that provides optimal thermal
and electrical performance.
* EP = Exposed pad.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T Denotes tape-and-reel.
0°C to +70°C
0°C to +70°C
Ordering Information
Maxim Integrated │ 11
Low-Power DOCSIS 3.1
Programmable-Gain Amplifier

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