參數(shù)資料
型號(hào)： UPD9903GT
廠商： NEC Corp.
元件分類： Codec
英文描述： UPD9903 ANALOG SUBSCRIBER LINE LSI DIGITAL CODEC
中文描述： UPD9903模擬用戶線數(shù)字編解碼器大規(guī)模集成電路
文件頁數(shù)： 7/28頁
文件大?。?/td> 135K
代理商： UPD9903GT
μ
PD9903
7
2. USE CAUTIONS
(1) Combined characteristics of the
μ
PC9903 and
μ
PD7073
The
μ
PD9903 is designed to be used in combination with the
μ
PC7073. Therefore, the first half of the electrical
specifications described below are ratings for the
μ
PD9903 as a discrete unit while the second half are
combined ratings with the
μ
PC7073.
Subscriber circuit constants that are determined by factors such as termination impedance are configured to
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.
(2) Absolute maximum ratings
Application of voltage or current in excess of the absolute maximum ratings may result in damage. Be
especially cautious about surges, etc.
(3) Load of by-pass capacitor
Because the
μ
PC7073 and
μ
PD9903 use several internal high-frequency operational amplifiers, high power
supply impedance can cause instability in these internal operational amplifiers (such as oscillation). To
suppress such instability and eliminate power supply noise, connect by-pass capacitors (C
ACOM
= approximate
0.1
μ
F) having superior high frequency characteristics as close as possible to the
μ
PC7073’s power supply
pins (V
BB
and V
CC
) and the
μ
PD9903’s power supply pins (AV
DD
and DV
DD
).
(4) Addition of ACOM pin connection capacitor
The voltage of the ACOM pin between the
μ
PC7073 and
μ
PD9903 is the reference voltage of the signal
source between the
μ
PC9903 and
μ
PC7073. Superposing of noise on this pin may have adverse effects
on transmission characteristics. Therefore, make the wires between the ACOM pins of the two LSIs as short
as possible, and connect capacitors (C
ACOM
= approximate 0.1
μ
F) having superior high frequency
characteristics as close as possible to the pins.
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