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參數(shù)資料
| 型號(hào)： | P11997EJ2V0AN00 |
| 英文描述： | uPC2757. uPC2758. and uPC8112. 3-V Power Supply. 1.9-GHz Frequency Down-converter ICs for Mobile Communication |
| 中文描述： | uPC2757。 uPC2758。和uPC8112。 3 - V單電源供電。 1.9 - GHz的頻率下，移動(dòng)通信轉(zhuǎn)換器IC |
| 文件頁數(shù)： | 19/51頁 |
| 文件大?。?/td> | 265K |
| 代理商： | P11997EJ2V0AN00 |
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Application Note P11997EJ2V0AN00
19
Figure 4-3. Input Port External Circuit Example (Example of RF Input of
μ
PC2757/58) (2/2)
Measuring circuit (Measuring circuit of data sheet)
1 000 pF
1 000 pF
3
2
1
4
5
6
LO
in
GND
RF
in
PS
V
CC
IF
out
(Top View)
Signal generator
2 900 pF
3 V
2 900 pF
POWER
SAVE
50
Signal generator
50
50
Spectrum analyzer
4.2 Output Pin Connection with Secondary Stage
(1) Internal circuitry of output circuit
The
μ
PC2757 and
μ
PC2758 have emitter-follower type IF outputs with low impedance in relation to 50
. The
μ
PC8112 has an open collector type output with high impedance in relation to 100 MHz to 300 MHz.
When the input impedance of an IF/SAW filter connected to the next stage is high (from 300 to 900
), such as
in digital mobile communications devices, the
μ
PC8112 with its open-collector type output is suitable.
When connected to a 50-
impedance such as a buffer amplifier or LC filter, the
μ
PC2757 and
μ
PC2758 with
their emitter-follower type IF outputs are suitable.
Although the above should be considered as selection criteria, you can select whichever method better suits
your needs. Figure 4-4 shows an internal equivalent circuit of each product and Figure 4-5 shows an external
circuit configuration.
Figure 4-4. Internal Equivalent Circuits
μ
PC2757, 2758
μ
PC8112
<3>
<4>
<6>
<2>
<1>
<5>
<4>
<6>
<2>
<1>
<5>
<3>
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