ML13175/ML13176

LANSDALE Semiconductor, Inc.

Figure 17a. 320 MHz ML13176 FM Transmitter

NOTES: 1. 50 Ω coaxial balun, 2 inches long.

2. Pins 5, 10 and 15 are grounds and connnected to VEE which is the component's side ground plane.

These pins must be decoupled to VCC; decoupling capacitors should be placed as close as possible to the pins.

3. RFC1 is 180 nH Coilcraft surface mount inductor or 190 nH Coilcraft 146–05J08.

4. Recommended source is a Coilcraft ™slot seven 7.0 mm tuneable inductor,part #7M3–682.

5. The crystal is a parallel resonant, fundamental mode calibrated with 32 pF load capacitance.

8

7

6

5

4

3

2

1

Osc

Tank

Coilcraft

146–04J08

0.146µ

51p

51p

f/32

Crystal

Fundamental

10 MHz

(5)

6.8 (4)

220p

VCC

0.47µ

27k

VCC

VCC

RFC1 (3)

510p

50Ω

(1)

9

10

11

12

13

14

15

16

RF Output

to Antenna

0.047µ

1.1k

RF Level Adjust

VCC = 3.8 to

3.3 Vdc

130k

33k

620

9.1k

15k

18k

100k

0.47µ

1.0k

2N4402

(2)

VEE

Data Input

(1.6 Vp–p)

0.1µ

5.0k

CW

VCC

SMA

Figure 17b. 320 MHz NBFM Transmitter

NOTES: 1. 50 Ω coaxial balun, 2 inches long.

2. Pins 5, 10 and 15 are grounds and connnected to VEE which is the component's side ground plane. These

pins must be decoupled to VCC; decoupling capacitors should be placed as close as possible to the pins.

3. RFC1 is 180 nH Coilcraft surface mount inductor.

4. RFC2 and RFC3 are high impedance crystal frequency of 10 MHz; 8.2 µH molded inductor gives XL > 1000 Ω..

5. A single varactor like the MV2105 may be used whereby RFC2 is not needed.

6. The crystal is a parallel resonant, fundamental mode calibrated with 32 pF load capacitance.

RF Output

to Antenna

8

7

6

5

4

3

2

1

Osc

Tank

Coilcraft

146–04J08

0.146µ

100p

180p

f/32

Crystal

Fundamental

10MHz

(6)

VCC

0.47µ

27k

VCC

VCC (3.6 Vdc – Lithium Battery)

RFC1

470p

UT–034

(1)

9

10

11

12

13

14

15

16

0.047µ

1.0k

RF Level Adjust

VCC

130k

33k

6.2k

9.1k

15k

15k

4700p

1.0k

2N4402

(2)

VEE

0.1µ

5.0k

CW

VCC

External

Loop Amp

10p

RFC2

RFC3

(4)

VCC

1.0k

(5) MMBV432L

0.01µ

+

10µ

Audio or

Data Input

SMA

(3)

Legacy Applications Information

www.lansdale.com

Page 10 of 16

Issue c