MC13135 MC13136
TEST CIRCUIT INFORMATION
Although the MC13136 can be operated with a ceramic
Since adding a matching circuit to the RF input increases
the signal level to the mixer, the third order intercept (TOI)
point is better with an unmatched input (50 Ω from Pin 21 to
Pin 22). Typical values for both have been included in the
Electrical Characterization Table. TOI measurements were
taken at the pins with a high impedance probe/spectrum
analyzer system. The first mixer input impedance was
measured at the pin with a network analyzer.
discriminator, the recovered audio measurements for both
the MC13135 and MC13136 are made with an LC quadrature
detector. The typical recovered audio will depend on the
external circuit; either the Q of the quad coil, or the RC
matching network for the ceramic discriminator. On the
MC13136, an external capacitor between Pins 13 and 14 can
be used with a quad coil for slightly higher recovered audio.
See Figures 10 through 13 for additional information.
Figure 1a. MC13135 Test Circuit
V
CC
24
0.84
µH
1st LO
Varicap
0.01
Figure 1.
1
2
0.1
23
20 p
39.0
MHz
Xtal
1.0 k
0.001
22
21
5.0 p
62 pF
180 p
RF
Input
3
0.2 µH
V
1
5.0 k
CC
0.01
4
5
20
0.1
Ceramic
Filter
10.7 MHz
2nd LO
120 p
V
2
50 p
CC
6
7
19
18
0.1
10.245
MHz Xtal
360
8
9
Ceramic
Filter
455 kHz
AF
8.2 k
17
16
Demod
10
11
0.1
Limiter
0.1
0.1
39 k
15
14
13
0.1
12
0.1
39 k
455 kHz
Quad
Coil
Figure 1b. MC13136 Quad Detector Test Circuit
V
CC
AF
Demod
Limiter
16
39 k
15
14
13
12
0.1
39 k
455 kHz
Quad Coil
3
MOTOROLA ANALOG IC DEVICE DATA
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