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參數資料
| 型號： | P14827EJ1V0AN00 |
| 英文描述： | uPB1005K RF/IF Down-Converter+PLL Frequency Synthesizer ICs for GPS Receivers |
| 中文描述： | uPB1005K射頻/中頻下變頻器鎖相環頻率合成器的GPS接收機 |
| 文件頁數： | 16/23頁 |
| 文件大小： | 188K |
| 代理商： | P14827EJ1V0AN00 |
16
Preliminary Application Note P14822EJ2V0AN
5. APPLICATION CHARACTERISTICS
5.1 Operation Rise/Fall Times
The measurement of the rise and fall times at the V
CC
and PS pins is controlled at high speed by turning on and off
the pins using a pulse pattern generator. Moreover, the time from when the output of the desired RF frequency is at
the maximum level to when it is at the minimum level is set using the zero-span mode of a spectrum analyzer.
Because the rise time is dependent on the DC cut capacitor, a DC cut capacitor of about 100 pF is required to obtain
the same value as that in the data sheet. The measurement results are shown in Table 5-1, and the rise/fall
waveforms of the
μ
PC8172TB are shown in Figure 5-1 as a typical example.
Table 5-1. Rise/Fall Times per Capacitance of DC Cut Capacitor at IF Pin
Rise time
Capacitance of DC Cut Capacitor at IF Input Pin
Part Number
Control Pin
Note
1 000 pF
400 pF
100 pF
PS
10
μ
s
4.5
μ
s
2
μ
s
V
CC
6
μ
s
2.5
μ
s
1.5
μ
s
μ
PC8172TB
PS, V
CC
simultaneously
10
μ
s
4.5
μ
s
2
μ
s
μ
PC8187TB
V
CC
4
μ
s
2
μ
s
1.5
μ
s
Fall time
Capacitance of DC Cut Capacitor at IF Input Pin
Part Number
Control Pin
Note
1 000 pF
400 pF
100 pF
PS
6.5
μ
s
2.5
μ
s
1.5
μ
s
V
CC
0.5
μ
s
0.5
μ
s
0.5
μ
s
μ
PC8172TB
PS, V
CC
simultaneously
1
μ
s
0.5
μ
s
0.5
μ
s
μ
PC8187TB
V
CC
0.5
μ
s
0.5
μ
s
0.5
μ
s
Note
PS pin control:
3 V always applied to V
CC
pin (2.8 V for
μ
PC8187TB), ON/OFF pulse
waveform inserted at PS pin.
3 V always applied to PS pin (2.8 V for
μ
PC8187TB), ON/OFF pulse
waveform inserted at V
CC
pin.
V
CC
pin control:
PS, V
CC
pin simultaneous control: ON/OFF pulse waveform inserted at PS and V
CC
pins simultaneously.
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