TH71101ENE-CAA-000RE(2017) 데이터 시트보기 (PDF) - Melexis Microelectronic Systems

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TH71101ENE-CAA-000RE
(Rev.:2017)

315/433MHz FSK/ASK Receiver

Melexis Microelectronic Systems  

TH71101

315/433MHz

FSK/ASK Receiver

1.3. Block Diagram

12

34

5

6

7

8

9 10 11 12 13

21

14 15

16

IN_LNA

31

LNA

32 30

MIX1

IF

MIX2

IF

IFA

LO

MIX3

DIV_16

PFD

RO

VCO1

CP

BIAS

29 LF

26 RO

25 27

28

22

17

OUTP

23

OUTN

24

OAP

OA

20

OAN

19

OUT_OA

18

1.4. Mode Configurations

Fig. 1: TH71101 block diagram

ENRX

0

1

Mode

Description

RX standby

RX active

RX disabled

RX enable

Note: ENRX are pulled down internally

1.5. LNA GAIN Control

VGAIN_LNA

< 0.8 V

> 1.4 V

Mode

Description

HIGH GAIN

LOW GAIN

LNA set to high gain

LNA set to low gain

Note: hysteresis between gain modes to ensure stability

1.6. Frequency Planning

Frequency planning is straightforward for single-conversion applications because there is only one IF that can be

chosen, and then the only possible choice is low-side or high-side injection of the LO signal (which is now the one and

only LO signal in the receiver).

The receiver’s single-conversion architecture requires careful frequency planning. Besides the desired RF input signal,

there are a number of spurious signals that may cause an undesired response at the output. Among them is the image

of the RF signal that must be suppressed by the RF front-end filter.

REVISION 018 - JUNE 29, 2017

3901071101

Page 4 of 20

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