INFINEON TDA5221 User Manual

Preliminary Specification, V 1.1, October 2004

TDA 5221

ASK/FSK Single Conversion Receiver Version 1.1

Wireless Control Components

Never stop thinking.

Edition 2004-10-20 Published by In fineon Technologies AG,

St.-Martin-Strasse 53, 81669 München, Germany

Attention please!

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Preliminary Specification, V 1.1, October 2004

TDA 5221

ASK/FSK Single Conversion Receiver Version 1.1

Wireless Control Components

Never stop thinking.

TDA 5221 Revision History: 2004-10-20 V 1.1

Previous Version: none Page Subjects (major changes since last revision)

We Listen to Your Comments

Any information within this document that you feel is wrong, unclear or missing at all? Your feedback will help us to continuously improve the quality of this document. Please send your proposal (including a reference to this document) to:

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TDA 5221

Table of Contents Page

1 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.3 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 Pin Definition and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3 Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.4 Functional Block Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.4.1 Low Noise Amplifier (LNA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.4.2 Mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.4.3 PLL Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.4.4 Crystal Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.4.5 Limiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.4.6 FSK Demodulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.4.7 Data Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.4.8 Data Slicer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2.4.9 Peak Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2.4.10 Bandgap Reference Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.1 Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.2 Data Filter Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.3 Crystal Load Capacitance Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.4 Crystal Frequency Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.5 Data Slicer Threshold Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.6 ASK/FSK-Data Path Functional Description . . . . . . . . . . . . . . . . . . . . . . . 25

3.7 FSK Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.8 ASK Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3.9 Principle of the Precharge Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

4 Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.1 Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.1.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.1.2 Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.1.3 AC/DC Characteristic s at

4.1.4 AC/DC Characteristics at T

4.2 Test Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

4.3 Test Board Layouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

4.4 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

5 Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

= 25°C . . . . . . . . . . . . . . . . . . . . . . . . . 33

AMB

= -40 to 105°C . . . . . . . . . . . . . . . . . . . . 39

AMB

Preliminary Specification 5 V 1.1, 2004-10-20

TDA 5221

Product Description

1 Product Description

1.1 Overview

The IC is a very low power consumption single chip FSK/ASK Superheterodyne Receiver (SHR) for the frequency band 300 to 340 MHz. The IC offers a high level of integration and n eeds only a few external components. The device c onta ins a l ow n ois e amplifier (LNA), a double balanced mixer, a fully integrated VCO, a PLL synthesiser, a crystal oscillator, a limiter w ith RSSI gene rator, a PLL FSK demod ulator , a data fil ter, an advanced data comparator (slicer) with selection between two threshold modes and a peak detector. Additionally there is a power down feature to save current and extend battery life, and two selectable alternatives of generating the data slicer threshold.

1.2 Features

• Low supply current (Is = 6.4 mA typ. in FSK mode, Is = 5.6 mA typ. in ASK mode)

• Supply voltage range 5V ±10%

• Power down mode with very low supply current (50nA typ.)

• FSK and ASK demodulation capability

• Fully integrated VCO and PLL Synthesiser

• ASK sensitivity better than -110 dBm over specified temperature range (- 40 to +105°C)

• Selectable frequency ranges 300-320 MHz and 320-340 MHz

• Switchable between two different frequency channels (see Section 2.4.3)

• Limiter with RSSI generation, operating at 10.7MHz

• 2nd order low pass data filter with external capacitors

• Data slicer with selection between two threshold modes (see Section 2.4.8)

• FSK sensitivity better than -102 dBm over specified temperature range (- 40 to +105°C)

1.3 Application

• Keyless Entry Systems

• Remote Control Systems

• Alarm Systems

• Low Bitrate Communication Systems

Preliminary Specification 6 V 1.1, 2004-10-20

TDA 5221

2 Functional Description

2.1 Pin Configurat ion

VCC

LNI

LNO VCC

MIX

IF O

VDD

1 2 3 4 5 6 7 8 9 10 11 12 13 14

TD A 5221

CRST1

TAGC

AGND

FSEL

DGND

28 27 26 25 24 23 22 21 20 19 18 17 16 15

Functional Description

CRST2 PDW N PDO DATA 3VO UT THRES FFB OPP SLN SLP LIMX LIM SSEL MSEL

Figure 1 Pin Configuration

Preliminary Specification 7 V 1.1, 2004-10-20

TDA 5221

Functional Description

2.2 Pin Definition and Functions

Table 1 Pin Defintion and Function Pin

No.

1 CRST1 External Crystal

2 VCC 5V Supply 3 LNI LNA Input

Symbol Equivalent I/O Schematic Function

Connector 1

4.15V

50uA

57uA

500uA

Preliminary Specification 8 V 1.1, 2004-10-20

TDA 5221

Symbol Equivalent I/O Schematic Function

Functional Description

No.

4TAGC AGC Time

4.3V

3uA

1.4uA

1.7V

Constant Control

5 AGND Analogue

Ground Return

6 LNO LNA Output

7 VCC 5V Supply

Preliminary Specification 9 V 1.1, 2004-10-20

TDA 5221

Symbol Equivalent I/O Schematic Function

Functional Description

No.

MIX

2k 2k

400uA

Mixer Input

1.7V

Complementary Mixer Input

10 AGND Analogue

Ground Return

11 FSEL Frequency

Selector

40k

12 IFO 10.7 MHz IF

Mixer Output

300uA

2.2V

4.5k

13 DGND Digital Ground

Return

Preliminary Specification 10 V 1.1, 2004-10-20

TDA 5221

Symbol Equivalent I/O Schematic Function

Functional Description

No.

14 VDD 5V Supply (PLL

Counter Circuity)

15 MSEL ASK/FSK

Modulation Format Sector

1.2V

40k

16 SSEL Data Slicer

Reference Level Sector

1.2V

40k

Limiter Input

2.4V

LIM

LIMX

15k

330

15k

Complementary Limiter Input

75uA

Preliminary Specification 11 V 1.1, 2004-10-20

TDA 5221

Symbol Equivalent I/O Schematic Function

Functional Description

No.

19 SLP Data Slicer

Positive Input

15uA

100

80µA

20 SLN Data Slicer

Negative Input

5uA

10k

21 OPP OpAmp

Noninverting Input

5uA

200

22 FFB Data Filter

Feedback Pin

5uA

Preliminary Specification 12 V 1.1, 2004-10-20

100k

TDA 5221

Symbol Equivalent I/O Schematic Function

Functional Description

No.

23 THRES AGC Threshold

Input

5uA

10k

24 3VOUT 3V Reference

Output

20k

Ω

3.1V

25 DATA Data Output

500

40k

26 PDO Peak Detector

Output

446k

Preliminary Specification 13 V 1.1, 2004-10-20

TDA 5221

Symbol Equivalent I/O Schematic Function

Functional Description

No.

27 PDWN Power Down

220k

Input

28 CRST2 External Crystal

Connector 2

4.15V

50uA

Preliminary Specification 14 V 1.1, 2004-10-20

TDA 5221

2.3 Functional Block Diagram

VCC

68912 1718

LNI

TAGC

VCC

DGND

LNA

2,7 5,10

VCC AGND

Figure 2 Block Diagram

Filter

MIXLNO

IFO SLN

LIM LIMX

LIMITER

TDA 5221

OTA

: 128

: 2 VCO

Loop Filter

DET

: 129

FSEL

2.4 Functional Block Description

FSK

PLL Demod

: 2

MSEL

H=ASK

L=FSK

CRYSTAL

OSC

Crystal

FFB

FSK ASK

28 27

Functional Description

OPP

SLP

22 21 19

SSEL

Logic

DATA

DATA-

SLICER

PEAK

PDO

DETECTOR

THRES

REF

AGC

Reference

Bandgap

Reference

PDWN

3VOUT

2.4.1 Low Noise Amplifier (LNA)

The LNA is an on-chip cascode amplifier with a voltage gain of 15 to 20dB. The gain figure is determined by the external matching networks situated ahead of LNA and between the LNA output LNO (Pin 6) and the Mixer Inputs MI and MIX (Pins 8 and 9). The noise figure of the LNA is approximately 3dB, the current consumption is 500µA. The gain can be reduce d by approxi mately 18 dB. The swit ching poi nt of this AGC ac tion can be determined externally b y applyi ng a thresh old volta ge at the THRES pin (Pin 23). This voltage is compared internally with the received signal (RSSI) level generated by the limiter circuitry. In case that the RSSI level is higher than the threshold voltage the LNA gain is reduced and vice versa. The threshold voltage can be generated by attaching a voltage divider between the 3VOUT pin (Pin 24) which provides a temperature stable 3V output generated from the internal bandgap voltage and the THRES pin as described in Section 3.1. The time constant of the AGC action can be determined by connecting a capacitor to the TAGC pin (Pin 4) and should be chosen along with the appropriate threshold voltage according to the intended operating case and interference scena rio to be expe cted du ring ope ration. The optim um ch oice of AGC time constant and the threshold voltage is described in Section 3.1.

Preliminary Specification 15 V 1.1, 2004-10-20

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