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Issue 0

LANSDALE Semiconductor, Inc.

ML13135

Figure 1.

24

0.2

µH

RF

Input

62 pF

0.001

23

22

21

20

19

18

180 p

0.01

0.1

360

Ceramic

Filter

10.7 MHz

455 kHz

Quad

Coil

39 k

39 k

0.1

8.2 k

17

16

15

14

13

12

0.1

0.01

3

2

1

4

5

6

7

8

9

10

11

0.1

0.1

0.1

Ceramic

Filter

455 kHz

10.245

MHz Xtal

39.0

MHz

Xtal

20 p

5.0 p

50 p

5.0 k

120 p

0.1

VCC

0.1

1.0 k

0.84

µH

AF

VCC2

2nd LO

VCC1

1st LO

Varicap

Limiter

Demod

Figure 1a. ML13135 Test Circuit

The recovered audio measurements for the ML13135 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 dis-

criminator. See Figures 10 and 11 for additional information.

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 ana-

lyzer system. The first mixer input impedance was measured at

the pin with a network analyzer.

TEST CIRCUIT INFORMATION