Datasheet > EVB71081

EVB71081

更新时间： 2024-01-23 03:54:41

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EVB71081 EValuation Board for TH71081 868/915MHz ASK Transmitter / LO Source

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中文翻译

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EVB71081 数据手册

EVB71081

868/915MHz Transmitter

Evaluation Board Description

Theory of Operation

General

ASK Modulation

As depicted in Fig.1, the TH71081 transmitter

consists of a fully integrated voltage-controlled

oscillator (VCO), a divide-by-32 divider (div32), a

phase-frequency detector (PFD) and a charge

pump. An external loop filter at pin LF determines

the dynamic behaviour of the PLL and suppresses

reference spurious signals.

The VCO’s output signal feeds the power amplifier

(PA). RF signal power P_ocan be adjusted in six

steps from P_o= –15 dBm to +1 dBm either by

changing the value of resistor R₁or by varying the

voltage V_PSat pin PS/DATA. The open-collector

differential output (OUT1, OUT2) can be used to

either directly drive a loop antenna or to be

converted to a single-ended impedance by means

of a balanced-to-unbalanced (balun) transformer.

For maximum available output power, the

differential output should be matched to a load of

approx. 1 kΩ.

The TH71081 can be ASK-modulated by applying

data directly at pin PS. This turns the PA on and off

and therefore leads to an ASK signal at the output

LO Source

Many applications require a stable RF source. For

this purpose, the TH71081 can be used without

modulation as an easy-to-use, PLL-stabilized,

continuous wave (CW) generator.

Mode Control Logic

The mode control logic allows two different modes

of operation as listed in the following table. The

mode control pin ENTX is pulled-down internally.

This guarantees that the whole circuit is shut down

if this pin is left floating.

ENTX

Mode

Description

TX disabled whole circuit in standby

TX enable TX active

Bandgap biasing ensures stable operation of the IC

at a power supply range of 2.2 V to 5.5 V.

Table 1: Modes of operation

Output Power Selection

typical values at T_a= 23 °C and V_cc= 3 V:

7.5

R1 / kΩ

R2 / kΩ

4.7

1.1

9.5

-2

4.7

0.9

8.5

-5

4.7

0.7

7.8

-8

4.7

0.5

4.7

0.3

V_PS/ V

≥ 2

12.5

I_cc/ mA

7.0

6.2

P_o/ dBm

P_harm/ dBm

-12

≤-45

-15

≤-50

≤-40

≤-45

Table 2: Output Power Selection

V_cc

If the transmitter is operated at any supply voltage V_cc,

the values for R₁and R₂can be calculated as allows:

R₁= R₂•

−1

V_PS

For more detailed information, please refer to the latest TH71081 data sheet revision.

390127108101

Rev. 003

2 of 8

EVB Description

Aug/02

123 4 5 6 7 8

中文翻译

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EVB71101-433-ASK-C	MELEXIS	获取价格	315/433MHz Receiver Evaluation Board Description
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