MC13030
Therefore, its gain is determined by the load impedance
S Out versus IF Input:
connected between Pins 15 and 16. Pin 16 is a voltage
reference for the output. The output is internally connected to
the AM detector, and Pin 13 is the detector output. This
detector also provides the AGC signal for the IF amplifier. An
RC filter from Pin 13 to 12 removes the audio, leaving a dc
level proportional to the carrier level for AGC.
Pin 11 provides a current proportional to signal strength.
It is a current source so a resistor must be connected from
Pin 11 to ground to select the desired dc voltage range. The
current is proportional to the signal level at Pin 17, the IF
amplifier input.
The S output current at Pin 11 is provided by two
collectors, one a PNP source and the other a sink to ground.
The desired S output voltage can be selected using the curve
of Figure 3 and calculating the value of the required resistor.
Figure 3. S Output Current versus IF Input Level
70
60
A high–gain limiting amplifier is used to derive the station
detect (SD) signal output on Pin 10; this output is present only if
it is turned on by the voltage on Pin 8. If the voltage on
Pin 8 is less than the voltage on Pin 11, the output on Pin 10 is
“on”. The station detector IF output on Pin 10 is used with
synthesizers which have a frequency counting signal detector.
The RF AGC outputs on Pins 4 and 5 are controlled by the
signal levels at Mixer1 or Mixer2. Bypass capacitors are
required on Pins 6 and 4 to remove audio signals from the
AGC outputs. Pin 4 is designed to control the NPN transistor
in series with the RF amplifier FET. The voltage on Pin 4 is
5.1 V with no input signal and decreases with increasing input
signal. Pin 5 is designed to control an additional AGC circuit
at the antenna input. The voltage on Pin 5 is at 0 V with no
input signal and increases with increasing input signals. The
voltage on Pin 5 does not increase until the voltage on Pin 4
has decreased to about 1.3 V. In most cases, Pin 5 is used to
drive a diode shunt. Maximum output current is about 850 µA.
The RF AGC sensitivity is about 40 mVrms input to Mixer1
or about 2.0 mVrms input to Mixer2 at 1.0 MHz. The AGC
sensitivity for both mixers can be decreased by adding a
resistor from Pin 6 to ground. There is also an additional
amplifier between Mixer1 and its AGC rectifier. The gain of
this amplifier and AGC sensitivity for Mixer1 can be increased
by adding a resistor from Pin 7 to ground. Therefore, the
desired AGC sensitivity for both mixers can be achieved by
changing the resistors on Pins 6 and 7.
40
20
0
30
40
50
60
70
80
90
100
IF INPUT LEVEL (dB
µV)
RF FET AGC versus Mixer1 and Mixer2 Input Level:
Figures 4 and 5 are generated with no external resistance
on Pins 4 or 6, so they represent the minimum RF AGC
sensitivity of Mixer1 and Mixer2.
Figure 4. RF AGC Voltage versus Mixer1 Input
5.0
4.0
3.0
2.0
1.0
0
Figure 2. Pin Connections and DC Voltages
3.3 V
3.3 V
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
85
90
95
100
V)
105
5.1 V
5.1 V
5.1 V
7.8 V
Mix1 In
VCO Out
VCO
MIXER1 INPUT LEVEL (dB
µ
Mix1 In
Figure 5. RF AGC Voltage versus Mixer2 Input
3
0 V
RF Gnd
VCO Ref
Mix1 Out
Mix1 Out
5.0
5.1 to 0 V
4
FET RF AGC
0 to 850
µA
0 to 2.8 V
5
4.0
3.0
2.0
7.8 V
6.5 V
3.7 V
7.9 V
RF AGC2
6
200 mV
RF AGC Adj
Mix1 RF AGC Adj
SD Level
V
ref
43 mV
0 to 4.8 V
0 V
7
Mix2 In
Mix2 Out
Mix2 Out
8
9
7.9 V
IF Gnd
1.0
0
10
11
6.5 V
4.4 V
5.0 V
4.8 V
SD IF Out
S Level Out
IF AGC In
AF Out
Xtal Osc E
Xtal Osc B
IF In
0 to 4.8 V
65
70
75
80
3.6 to 4.5 V 12
MIXER2 INPUT LEVEL (dB
µV)
13
14
3.6 to 4.5 V
8.0 V
Det V
ref
4.1 V
4.1 V
V
Det In
CC
4
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