LND-TRM33 データシートの表示（PDF） - Linear Dimensions Semiconductor

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LND-TRM33

LOW POWER 300 TO 500 MHz ASK TRANSMITTER

Linear Dimensions Semiconductor 

LND TRM33

LOW POWER 300 TO 500 MHz ASK TRANSMITTER

Matching network

and antenna

options

(continued)

The LND TRM33 needs the following:

For optimum operation, the following points are

1) a dc bias reference to VCC (for instance through highlighted:

use of printed bias inductors with a connection to 1) the IC can provide 7.5mA of current into the load

VCC, or direct connection of a loop antenna

2) for maximum output power, it is recommended

connected to VCC at its centre). Linear’s

that the antenna load be transformed to an

TRM3x series of evaluation boards provide large impedance of 200Ohms

and small loop antenna solutions for customers to

copy. These boards require a minimum number

of external components, and importantlyno

discrete inductors are required. For driving an

external single-ended antenna, a high-efficiency

printed balun is also available.

3) a PLL synthesizer is designed to operate with an

external second order loop filter as shown in

figure 2, with component values as shown in

Table 6. These values determine the loop

bandwidth and dynamics and operation of the loop

is not guaranteed for any other values

.

4) the bias current for the power amplifier directly

Table 5: Output Power Settings

R

(kOhms)

Output power

(dBm)

2.8

2

3.8

0

Current cons.

(mA)

25

22

controls the output current and hence the O/P

power. This bias current is set by an external

resistor connected between PS and ground.

Output power versus R1 values is shown in

Table 5, for a differential load impedance of 200 Ω.

5.2

-2

20

6.7

-4

19

8.5

-6

18

9.7

-8

17

10.3

-10

16

10.7

-12

16

Table 6: Recommended External Components

Component

Function

C1

Crystal Oscillator

C2

Crystal Oscillator

C5

Supply Decoupling

C6

Regulator Decoupling

C7

PLL Loop Filter

C8

PLL Loop Filter

R1

O/P power set

R2

PLL Loop Filter

X1

Crystal

Note: Recommended Crystal Oscillator type: B537

Table 7: I/O interfacing

No. Signal

1

OP1

2

VEE1

3

PS

4

SBY

5

DATA

6

VEE2

7

N/C

8

RO1

9

RO2

10 VSUB

11 VCC

12 BYPS

13 LF

15 VEE

16 OP2

Description

PA Output

Ground (0V)

Power Set

Standby (complete power down)

Data

Ground (0V)

Not connected

Reference Oscillator (emitter)

Reference Oscillator (base)

Substrate Connection (0V)

Supply (Battery)

Power supply decoupling to ground

Low Pass Filter

Ground (0V)

PA Output (complement)

Value

22

22

100

100

1

47

3.9

3.3

6.78

Tolerance

± 5%

± 5%

± 20%

± 20%

± 5%

± 5%

± 5%

± 5%

< 20ppm

Units

pF

pF

nF

nF

nF

pF

kOhms

kOhms

MHz

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