MC13150FTA Просмотр технического описания (PDF) - Motorola => Freescale
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MC13150FTA Datasheet PDF : 20 Pages
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MC13150
IF Amplifier
The first IF amplifier section is composed of three
differential stages. This section has internal dc feedback and
external input decoupling for improved symmetry and
stability. The total gain of the IF amplifier block is
approximately 42 dB at 455 kHz. Figure 8 shows the gain of
the IF amplifier as a function of the IF frequency.
The fixed internal input impedance is 1.5 kΩ; it is designed
for applications where a 455 kHz ceramic filter is used and no
external output matching is necessary since the filter requires
a 1.5 kΩ source and load impedance.
Overall RSSI linearity is dependent on having total
midband attenuation of 10 dB (4.0 dB insertion loss plus 6.0
dB impedance matching loss) for the filter. The output of the
IF amplifier is buffered and the impedance is 1.5 kΩ.
Limiter
The limiter section is similar to the IF amplifier section
except that six stages are used. The fixed internal input
impedance is 1.5 kΩ. The total gain of the limiting amplifier
section is approximately 96 dB. This IF limiting amplifier
section internally drives the quadrature detector section.
Figure 8. IF Amplifier Gain
versus IF Frequency
50
45
40
35
Vin = 100 µV
30 Rin = 50 Ω
Rout = 1.4 kΩ
25
BW (3.0 dB) = 2.4 MHz
TA = 25°C
20
0.01
0.1
1.0
10
f, FREQUENCY (MHz)
Figure 9. Fadj Current
versus IF Frequency
120
100
VCC = 3.0 Vdc
Slope at 455 kHz = 9.26 kHz/µA
80
60
40
20
0
0
200
400
600
800
1000
f, IF FREQUENCY (kHz)
800
750
700
650
600
0
Figure 10. Fadj Voltage
versus Fadj Current
VCC = 3.0 Vdc
TA = 25°C
20
40
60
80
100
Fadj CURRENT (µA)
Figure 11. BWadj Current
versus IF Frequency
3.5
3.0
VCC = 3.0 Vdc
BW 26 kHz/µA
2.5
2.0
1.5
1.0
0.5
0
400
420
440
460
480
500
f, IF FREQUENCY (kHz)
6
MOTOROLA ANALOG IC DEVICE DATA
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