MC13030 Просмотр технического описания (PDF) - Motorola => Freescale
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производитель
MC13030 Datasheet PDF : 16 Pages
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Pin No.
17
18
19
20, 21
22
23
24, 25
MC13030
PIN FUNCTION DESCRIPTION (continued)
Internal Equivalent Circuit
Description
17
2.0 k
4.8 V
To SD
Circuit
IF Input
The IF input impedance is 2.0 k to match most ceramic 455 or 450 kHz
filters. For a ceramic filter requiring a 1.5 k load, a 5.6 k resistor in
series with a 0.01 µF capacitor should be connected from Pin 17 to
ground.
5.1 k
18
500
19
20
21
22
2.4 k
3.7 V
5.1 V
51
To AGC
Circuit
51
3.0 mA
23
6.5 V
Vref
24
25
VCO
5.1 V
Crystal Oscillator Base
The crystal oscillator is a simple Colpitts type, operating at a low
current. The crystal should operate at 10.250 MHz for 450 kHz IF or
10.245 MHz for 455 kHz IF with a 20 pF load capacitance. The
oscillator signal to the second mixer is coupled from Pin 18 through an
emitter follower. If a synthesizer such as the Motorola MC145170 with
a 15 bit programmable R counter is used, the 10.245 MHz crystal can
be connected to the synthesizer, and a 200 mVpp oscillator signal
from the synthesizer can be capacitively coupled to Pin 18, so only
one crystal is needed.
Crystal Oscillator Emitter
The capacitive divider from Pin 18 is connected as shown in the
application circuits of Figures 10, 11, 12.
Mixer2 Output
The maximum AC collector voltage is about 5.8 Vpp or 2.0 Vrms. The
mixer conversion transconductance gc = 0.0046 mho. The load
impedance should be selected so the mixer output does not overload
before the input.
Mixer2 Input
The input impedance is 2.4 k. A series R–C network from Pin 22 to
ground or a resistor from the filter to Pin 22 can be used to properly
match the filter. In most cases, a 10.7 MHz crystal filter can be connected
to Pin 22 directly without any additional components. IP3 (third order
intercept) at the input is 5.0 dBm (112 dBµ). To guarantee –50 dB IM3, the
input level should not be greater than –20 dBm (87 dBµ) (22.7 mVrms).
Vref
This is the main reference voltage for most of the circuits in the IC and
should be bypassed with a 1.0 µF capacitor.
Mixer1 Output
The maximum collector voltage is about 5.8 Vpp or 2.0 Vrms. The mixer
conversion transconductance gc = 0.0022. The load impedance should
be selected so the mixer output does not overload before the input.
8
MOTOROLA ANALOG IC DEVICE DATA
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