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MC13146

Low Power Integrated Transmitter for ISM Band Applications

Motorola => Freescale 

Freescale SMeCm1i3c14o6nductor, Inc.

Figure 4. Test Circuit for Figure 3.

ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005

VCC

Mixer/Buf Out

51

51

100 p

24 23 22 21 20 19

1

18

Amp

2

Control 17

3

16

PRSC

4

15

5

14

1.0 n

R5

6

13

789

VCC

LO In

100 p

10 11 12

22 p

100 p

51

VCC

82 nH

Figure 5. Typical Prescaler

Operating Window

5.0

0

–5.0

–10

–15

–20

–25

VCC = 3.6 V

TA = 25°C

–30

0

500

1000

1500

2000

Fin (MHz)

Mixer/Buffer Input

The Mixer/Buf In pin is a broadband, 50 Ω input used to

drive the IF port of the mixer (see Table 2, S11

parameters).The Mixer/Buf In pin can be used in one of three

modes:

1. A IF signal can be applied to this pin and up–converted

to the desired RF frequency.

2. A resistor can be connected to ground, controlling the

RF output power.

3. A resistor can be connected to VCC, disabling the entire

mixer.

The linear gain of the Mixer/Buf when used as a buffer is

approximately –5.0 to –8.0 dB.

Mixer/Buffer Outputs

The mixer outputs (Mixer/Buf Out + and Mixer/Buf Out –)

are balanced, open collector. A shunt resistor of 200 Ω

minimum to VCC is recommended for stability.

The outputs can be used as a single–ended driver or

connected in a balanced–to–unbalanced configuration. If the

single–ended driver configuration is used, the unused output

must be tied directly to VCC. For the

balanced–to–unbalanced configuration, an additional 3.0 to

6.0 dB of power gain can be achieved. Conjugate matching is

easily accomplished to the desired load by the addition of a

shunt and series element (see Table 2, S22 parameters).

Low Power Amplifier (LPA)

The LPA is internally biased at low supply current

(approximately 2.0 mA emitter current) for optimal low power

operation, yielding a 10 dBm 1.0 dB output power

compression point. Input and output matching may be

achieved at various frequencies using few external

components (see Table 3 S–parameters). Typical power gain

is 16 dB with the input/output conjugately matched to the

source/load impedance. A minimum 200 Ω shunt resistor

from the output to VCC is recommended for stability.

MOTOROLA RF/IF DEVICE DATA For More Information On This Product,

7

Go to: www.freescale.com

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