oq2538u NXP Semiconductors, oq2538u Datasheet - Page 13

• Manufacturer Part Number: oq2538u
• Description: Sdh/sonet Stm16/oc48 Main Amplifiers
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Using alternative supply voltages
Although the OQ2538HP is intended to be used with a
single 4.5 V supply voltage, a slightly modified 5 V
supply can also be used. By connecting a Schottky diode
between the V
additional 0.5 V voltage drop is obtained, bringing the
supply voltage on the pins of the OQ2538HP within the
specified range. A BAS85 Schottky diode is
recommended. A 5 V application schematic is shown in
Fig.15.
Extrapolating from this case, a +5 V application is also
possible. However, care should be taken with the RF
transmission lines. The on-chip signals refer to the GND
pins, which become the positive supply pins in a +5 V
application. The external transmission lines will most likely
be referenced to system ground (V
will change from one reference plane to another at the
interface to the RF input and output pins. The positive
supply application is very vulnerable to interference at this
point. For a successful +5 V application, special care
should be taken when designing board layout to reduce
the influence of interference and keep the positive supply
as clean as possible.
2000 Sep 29
SDH/SONET STM16/OC48 main amplifiers
EE
power supply line and the IC, an
EE
pins). The RF signals
13
ESD protection
Exceptions have been made to the standard ESD
protection scheme in order to achieve high frequency
performance. The inputs IN and INQ and the outputs OUT
and OUTQ have no protection against ESD. All other pins
have a standard ESD protection structure, capable of
withstanding 2 kV Human Body Model (HBM) zappings.
OQ2538HP; OQ2538U
Product specification