MC44864 查看數據表（PDF） - Motorola => Freescale
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MC44864 Datasheet PDF : 12 Pages
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MC44864
HF CHARACTERISTICS (See Figure 1)
Characteristic
DC Bias
Input Voltage Range
10–150 MHz (Prescaler “Off”)
80–1000 MHz
1000–1300 MHz
Pin
10, 11
10, 11
10, 11
10, 11
Min
Typ
Max
Unit
–
1.55
–
V
mVrms
20
–
315
20
–
315
50
–
315
Figure 1. HF Sensitivity Test Circuit
BusController ÇÇÇÇÇÇÇÇÇÇÇÇI2CBÇÇus ÇÇÇÇÇÇÇÇÇÇ
+5.0 V
9
VCC1
18, 19
MC44864
HF Generator
HF Out Gnd
50 Ω Cable
11
1.0 nF
10
12
1.0 nF
50 Ω
12 V
3.9 k
1 17 B7
22 pF
4.0 MHz
In
Frequency
Counter
Device is in test mode: B7 is “On”, R2 = 1 and R3 = 0 (see Bus section).
Sensitivity is the level of the HF generator on 50 Ω load (without MC44864 load).
Figure 2. Typical HF Input Impedance
–j +j
0
0.5
0.5
1.3 GHz
ZO = 50 Ω
1
1
1.0 GHz
2
2
500 MHz
50 MHz
0.5
1
2
4
MOTOROLA ANALOG IC DEVICE DATA
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