UPC7073GT NEC [NEC], UPC7073GT Datasheet - Page 7

• Manufacturer Part Number: UPC7073GT
• Description: UPC7073 ANALOG SUBSCRIBER LINE LSI BS-SLIC
• Manufacturer: NEC [NEC]

2. USE CAUTIONS
(1) Combined characteristics of PC7073 and PD9903
(2) Absolute maximum ratings
(3) Load of by-pass capacitor
(4) Addition of ACOM pin connection capacitor
(5) Overcurrent prevention measures
• The PC7073 is designed to be used in combination with the PD9903. Therefore, first half of the electrical
• Subscriber circuit constants that are determined by factors such as termination impedance are configured to
Application of voltage or current in excess of the absolute maximum ratings may result in damage. Be
especially cautious about surges, etc.
Because the PC7073 and PD9903 use several internal high-frequency operational amplifiers, high power
supply impedance can cause instability (such as oscillation) in these internal operational amplifiers. To
suppress such instability and eliminate power supply noise, connect by-pass capacitors (C
0.1 F) having superior high frequency characteristics as close as possible to the PC7073’s power supply
pins (V
The voltage of the ACOM pin between the PC7073 and PD9903 is the signal source reference voltage
for the PC7073. Superposition of noise on this pin may have adverse effects on transmission character-
istics. Therefore, make the wires between the ACOM pin and the two LSIs as short as possible, and connect
capacitors (C
the pins.
Due to its structure, power to the
Accordingly, if power is supplied first to a power supply pin other than V
the PC7073 (an overcurrent will not flow if power is input to all power supply pins).
Therefore, if feeding to a power supply pin other than V
(rated at several
• Reverse-bias direction between V
• Reverse-bias direction between V
• Reverse-bias direction between V
characteristics described below are ratings for the PC7073 as a discrete unit while the second half are
combined ratings that include the PD9903.
enable setting by external order parameters. Consequently, input of an order that is not suitable for the target
impedance may result in failure to obtain the required characteristics.
BB
and V
ACOM
CC
) and the PD9903’s power supply pins (AV
= approx. 0.1 F) having superior high frequency characteristics as close as possible to
) in the directions described below.
BB
BB
CC
pin and V
pin and GND.
pin and GND.
PC7073 must first be supplied to a low-voltage potential (V
CC
pin.
BB
first, connect an external diode and limiting resistor
DD
and DV
BB
DD
, an overcurrent will flow within
).
ACOM
PC7073
= approx.
BB
).
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