TH71221 datasheet(39/44 Pages) MELEXIS

39 / 44 page

TH71221

27 to 930MHz

FSK/FM/ASK Transceiver

39010 071221

Page 39 of 44

Data Sheet

Rev. 009

Nov/15

TX/RX Combining Network

9.1

Board Component List (Fig. 19)

Part

Size

Value @

315

MHz

Value @

433.92

MHz

Value @

868.3

MHz

Value @

915

MHz

CRX0

0603

100 pF

CTX0

0603

10 pF

CTX1

0603

10 pF

6.8 pF

5.6 pF

4.7 pF

CTX2

0603

10 pF

6.8 pF

3.9 pF

CTX4

0603

12 pF

4.7 pF

2.2 pF

1.8 pF

LRX2

0603

82 nH

56 nH

15 nH

LTX0

0603

15 nH

3.9 pF

3.9 nH

LTX1

0603

33 nH

10 nH

CB2

0603

330 pF



No TX/RX switch required



Direct connection to

/4 antenna possible

Fig. 19: Combining network schematic

9.2

Typical LNA S-Parameters in Receive Mode

Low Gain Mode

Frequency

Re[S11]

Im[S11]

Re[S12]

Im[S12]

Re[S21]

Im[S21]

Re[S22]

Im[S22]

27 MHZ

0.9138

-0.0145

6.06E-005

4.27E-004

-0.4172

0.0334

0.9986

-0.0095

40 MHz

0.9139

-0.0229

5.53E-005

6.73E-004

-0.4092

0.0400

0.9984

-0.0136

80 MHz

0.9126

-0.0481

5.36E-005

1.48E-004

-0.3989

0.0581

0.9979

-0.0265

170 MHz

0.9054

-0.1026

7.44E-004

3.25E-003

-0.3828

0.1056

0.9966

-0.0558

315 MHz

0.8836

-0.1814

2.16E-004

6.21-E003

-0.3300

0.1798

0.9926

-0.1033

433 MHz

0.8622

-0.2625

7.81E-004

6.34E-003

-0.3248

0.2168

0.9870

-0.1417

868 MHz

0.7161

-0.4577

2.35E-003

1.09E-003

-0.1265

0.3187

0.9543

-0.2829

915 MHz

0.6975

-0.4753

2.24E-003

1.10E-003

-0.1062

0.3206

0.9494

-0.2980

Note:

input and output of the LNA are connected to 50

 ports without matching elements

High Gain Mode

Frequency

Re[S11]

Im[S11]

Re[S12]

Im[S12]

Re[S21]

Im[S21]

Re[S22]

Im[S22]

27 MHZ

0.8417

-0.0151

1.36E-004

8.63E-005

-4.0840

0.1272

0.9994

-0.0092

40 MHz

0.8424

-0.0276

1.42E-004

1.07E-004

-4.0840

0.2055

0.9994

-0.0135

80 MHz

0.8403

-0.0621

1.52E-004

1.83E-004

-4.0630

0.4338

0.9991

-0.0269

170 MHz

0.8273

-0.1344

1.86E-004

3.72E-003

-3.9550

0.9279

0.9977

-0.0571

315 MHz

0.7884

-0.2328

4.02E-004

7.04E-003

-3.5100

1.6990

0.9846

-0.1072

433 MHz

0.7492

-0.3405

1.51E-004

6.18E-003

-3.4700

1.9920

0.9839

-0.1439

868 MHz

0.5007

-0.5322

2.36E-004

1.06E-003

-1.6710

3.2230

0.9501

-0.2847

915 MHz

0.4714

-0.5440

1.94E-004

1.06E-003

-1.4690

3.2700

0.9451

-0.2995

Note:

input and output of the LNA are connected to 50

 ports without matching elements

LTX0

CTX0

CB2

CTX4

LRX2

CRX0

LTX1

CTX1

RF input

RF output

CTX2



OUT_PA

IN_LNA

VCC

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