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| 型號(hào)： | P12763EJ1V0AN00 |
| 英文描述： | MCU CMOS 28 LD 20MHZ 8K FLASH, -40C to +85C, 28-SPDIP, TUBE |
| 中文描述： | uPC8119T和uPC8120T可變?cè)鲆娓哳l硅單片放大器的AGC移動(dòng)通信股 |
| 文件頁(yè)數(shù)： | 16/19頁(yè) |
| 文件大小： | 159K |
| 代理商： | P12763EJ1V0AN00 |
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5.5 Supplement on Application
Because these ICs do not have a power save pin in limitation of the total number of pins, they must be turned
ON/OFF by the V
CC
voltage for intermittent operation. Turning ON/OFF the V
CC
voltage poses no problem to the
internal transistor of durability, as long as the voltage applied to the V
AGC
pin does not exceed 3 V.
Although the recommended operating range of the input level is specified to be P
in
: –18 dBm or less, this is under
the condition that the adjacent channel interference power (APC) is –60 dBc or less at
'
f =
r
50 kHz in the case of the
modulation signal of PDC. In the case of the modulation signal of PHS, it is P
in
: –10 dBm or less where the APC is
–60 dBc or less at
'
f =
r
600 kHz. Under conditions other than above, confirm the characteristics of the set to
determine the input level.
6. OTHER APPLICATION EXAMPLES
Although the application of the ICs at the narrow band has been explained so far, these ICs can be also used at a
wide band with a high-impedance load. In this case, the output pin is operated with an inductor load, instead of
frequency matching. Although the values of external components L1 and C2 of the output pin are small in Figure 5-2
according to the frequency for impedance matching in a narrow band, increase the values of these components in a
wide band by employing a high pass type external configuration that does not have a frequency dependency. For
example, L1 = 300 nH and C2 = 1000 pF (where the lower-limit frequency is 100 MHz) can be used. To cover a
lower-frequency range, increase the values of L1 and C2 much more. Figure 6-1 shows the frequency vs. power
gain characteristics in a wide band. The output port impedance at this time is close to S
22
of these ICs themselves.
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