Datasheet TH71071 Datasheet (MELEXIS)

Page 1

Features

! Fully integrated, PLL-stabilized VCO ! Flexible frequency range from 310 MHz to 450 MHz ! ASK achieved by on/off keying of internal

power amplifier

! FM possible with external varactor ! Wide power supply range from 2.2 V to 5.5 V ! High over-all frequency accuracy ! Very low standby current

TH71071

315/433MHz

ASK Transmitter / LO Source

! Adjustable output power rang e fr om

-12 dBm to +2 dBm

! Adjustable current consumption from

4.8 mA to 11.5 mA

! Differential output well-suited for loop

antenna

! Conforms to EN 300 220 and similar

standard

Ordering Information

Part No. Temperature Range Package

TH71071 -40 C° to 85 °C SOIC8

Application Examples Pin Description

! Keyless car and central locking ! Low-power telemetry ! Alarm and security systems ! General digital data transmission ! General analog audio signal transmission ! Local oscillator signal gener ation

ENTX

PS/DATA

1 2 3 4

TH71071

8 7 6 5

VEE OUT1

OUT2 VCC

3901071071 Page 1 of 10 Data Sheet Rev. 004 Dec. 2001

Page 2

General Description

TH71071

315/433MHz

ASK Transmitter / LO Source

The TH71071 ASK transmitter IC is designed for applications in the European 433MHz industrialscientific-m edical (ISM) band, according to the EN 300 220 telecommunications standard. It can also be used for any other system with carrier frequencies ranging from 310 MHz to 450 MHz (e.g. for applications in the US 315MHz ISM band).

Theory of Operation

General

As depicted in Fig.1, the TH71071 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 behavio ur of the PLL and suppres ses reference spurious signals. The VCO’s output signal fee ds the power amplifier (PA). RF signal power P steps from P changing the valu e of resistor R voltage V 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. Bandgap biasing ensures stab le operation of the IC at a power supply range of 2.2 V to 5.5 V.

ASK Modulation

The TH71071 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.

= –12 dBm to +2 dBm either by

at pin PS/DATA. The open-collector

can be adjusted in six

or by varying the

The transmitter's c arrier frequency f by the frequency of the reference crystal f used. The integrated P LL synthesizer ensur es that each RF value, ranging fr om 310 MHz to 4 50 MHz, can be achieved by using a cr ystal with reference frequency accordin g to: f the PLL feedback divider ratio.

LO Source

Many applications require a stable RF source. For this purpose, the TH71071 can be used without modulation as an easy-to-use, PLL-stabilized, continuous wave (CW) generator.

Frequency Modulation (FM)

For FM operation an external varactor is required. It simply acts as a pulling capacitor connected in series to the crystal. Then the analog modulation signal, applied through a series resistor, directly modulates the XOSC.

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 th e whole circuit is shut down if this pin is left floating.

ENTX Mode Description

0 TX disabled whole circuit in standby 1 TX enable TX active

Table 1: Modes of operation

= fc/N, where N = 32 is

ref

is determined

that is

ref

3901071071 Page 2 of 10 Data Sheet Rev. 004 Dec. 2001

Page 3

Block Diagram

TH71071

315/433MHz

ASK Transmitter / LO Source

VCC

div32

OUT2

PFD

XOSC

OUT1

PS/DATA 4VCC 5

VCO

ENTX

mode

control

charge

pump

8 VEE

CF1

CF2

RF1

XTAL

CX1

Fig. 1: TH71071 block diagram with external components

3901071071 Page 3 of 10 Data Sheet Rev. 004 Dec. 2001

Page 4

TH71071

315/433MHz

ASK Transmitter / LO Source

Pin Definition and Descripti on

Pin No. Name I/O Type Functional Schematic Description

1 LF analog I/O

2 RO analog I/O

3 ENTX input

4 PS/DATA analog I/O

LF 1

ENTX

RO1

PS/DATA

200

1.1k

Ω

28p

37k

200

connection to loop filter, charge pump output, VCO tuning input

200

Ω

XOSC connection to XTAL, Colpitts type crystal oscillator

mode control input, CMOScompatible with interna l pull-down

power-select and ASK input, high-impedance comparator

20µA

Ω

logic

5 VCC supply positive power supply

6 OUT2 output

VCC

differential power amplifier output, open collector

7 OUT1 output

OUT2

OUT1

differential power amplifier output, open collector

VEE

8 VEE ground negative power supply

3901071071 Page 4 of 10 Data Sheet Rev. 004 Dec. 2001

Page 5

Technical Data

Absolute Maximum Ratings

Parameter Symbol Condition Min Max Unit

TH71071

315/433MHz

ASK Transmitter / LO Source

Supply voltage V Input voltage V Input current I Storage temperature T Electrostatic discharge V

Normal Operating Conditions

Parameter Symbol Condition Min Max Unit

Supply voltage V Operating temperature T XOSC frequency f VCO frequency f

DC Characteristics

STG

ESD

ref

-0.3 7.0 V ENTX pin -0.3 VCC+0.3 V ENTX pin -1.0 1.0 mA

-40 150 °C

human body model,

-1.0 +1.0 kV MIL STD 833D method 3015.7

2.2 5.5 V

-40 85 °C set by the crystal 9.69 14 MHz fc = 32 • f

ref

310 450 MHz

all parameters under normal operating conditions, unless otherwise stated; typical values at T

= 23 °C and Vcc = 3 V

Parameter Symbol Condition Min Typ Max Unit

Standby current I Operating current I Input HIGH voltage V Input LOW voltage V Input current I Pull down current I

SBY

HIGH

LOW

ENTX=0 0.05 0.1 µA ENTX=1, VPS=1.1V 7 9 10 mA ENTX pin 0.7*V

ENTX pin -0.3 0.3*V ENTX=0 -1 1 µA ENTX=1 2 8 15 µA

Vcc+0.3 V

3901071071 Page 5 of 10 Data Sheet Rev. 004 Dec. 2001

Page 6

ASK Transmitter / LO Source

AC Characteristics

all parameters under normal operating conditions, unless otherwise stated; typical values at T ENTX = 1, V

Parameter Symbol Condition Min Typ Max Unit

= 23 °C and Vcc = 3 V;

= 1.1V, fc = 433.6 MHz, test circuit shown in Fig. 2

TH71071

315/433MHz

Output power P FM deviation

Modulation frequency FM f Data rate ASK R

∆f

mod

ASK

Reference spurs P Harmonic content P

harm

Spurious output signal P Phase noise PN VCO gain K Charge pump current I Start-up time t

VCO

ref

off

adjustable with varactor and V

NRZ 40 kbit/s @ fc ± f @ 2fc , 3fc , 4f V @ f

≤ 0.1V

± 500kHz

ref

from ”all OFF” to any

-1 dBm

±6

5kHz

-44 dBm

-40 dBm

-60 dBm

-87 dBc/Hz

200 MHz/V

±260

0.9 ms

other mode

Output Power Selection

typical values at T ENTX = 1, f

R1 / kΩ

R2 / kΩ

Ω

Ω Ω

Ω

Ω Ω

VPS / V

= 23 °C and Vcc = 3 V:

= 433.6 MHz, test circuit shown in Fig. 2

0 7.5 11 15 24 43

4.7 4.7 4.7 4.7 4.7

≥≥≥≥ 2

1.1 0.9 0.7 0.5 0.3

Icc / mA 11.5 8.6 7.3 6.2 5.3 4.8

Po / dBm 2 -1 -4 -7 -10 -12

harm

/ dBm

≤-40 ≤-40 ≤-40 ≤-45 ≤-45 ≤-50

kHz

µA

If the transmitter is operated at any supply voltage Vcc, the values for R

and R2 can be calculated as allows:











−•= 1





Crystal Parameter

Parameter Symbol Condition Min Max Unit

Crystal frequency f Load capacitance C Static capacitance C Resonance resistance R Spurious response a

crystal

load

spur

3901071071 Page 6 of 10 Data Sheet Rev. 004 Dec. 2001

fundamental mode, AT 9.69 14 MHz

10 15 pF

7pF

Ω

-10 dB

Page 7

Test Circuit

TH71071

315/433MHz

ASK Transmitter / LO Source

Fig. 2: Test circuit for ASK

with 50Ω matching network

Test circuit component list to Fig. 2

OUT

RF1

CF1CF2

VEE

OUT1

ROLFENTX

XT AL

VCC

OUT2

DA TA

VCC

ENTX

VCC

GND

DA TA

Part Size Value Tolerance Description

CF1 0603 10 nF CF2 0603 56 pF

CX 0603 68 pF

C1 0603 2.7 pF C2 0805 100 pF C3 0805 3.9 pF C4 0603 330 pF C5 0603 330 pF C6 0805 33 nF L1 0603 22 nH L2 0603 27 nH L3

RF1

0603 0603 0603

33 nH

1.5 kΩ±10%

See output power

selection table

0603

See output power

selection table

XTAL HC49/S 13.55 MHz

fundamental wave

±10% ±10% ±10%

±5% ±5%

±5% ±10% ±10% ±10%

±5%

±10%

±30ppm

calibration

±30ppm temp.

loop filter capacitor loop filter capacitor XOSC capacitor impedance matching capacit o r impedance matching capacit o r impedance matching capacit o r blocking capacitor blocking capacitor blocking capacitor impedance matching inductor impedance matching inductor impedance matching inductor loop filter resistor ASK power-select resistor, not requirement at CW mode

ASK or CW mode power-select resistor

crystal, C R

m, max

= 12 pF to 15 pF, C

load

= 60 Ω

0, max

= 7 pF,

3901071071 Page 7 of 10 Data Sheet Rev. 004 Dec. 2001

Page 8

ASK Transmitter / LO Source

Spectrum Plots

All plots depict TH71071‘s typical performance at Vcc = 3.0 V and Ta = 23 °C, derived with the test circuit shown in Fig. 2.

Fig. 3: RF output signal and spurious emissions, CW mode

TH71071

315/433MHz

Fig. 4: Single-sideband phase noise at 500 kHz offset, CW mode

Fig. 5: ASK modulation with R

= 4 kbit/s NRZ

ASK

3901071071 Page 8 of 10 Data Sheet Rev. 004 Dec. 2001

Page 9

Package Information

123

TH71071

315/433MHz

ASK Transmitter / LO Source

E1 E

A1 A

all Dimension in mm, coplanarity < 0.1mm

min 4.80 3.81 5.80 1.32 0.10 1.27 0.36 0.41 0°

max 4.98 3.99 6.20 1.72 0.25 0.46 1.27 8°

all Dimension in inch, coplanarity < 0.004”

min 0.189 0.150 0.2284 0.060 0.0040 0.05 0.014 0.016 0°

max 0.196 0.157 0.2440 0.068 0.0098 0.018 0.050 8°

Fig. 6: SOIC8 (Small Outline Package)

D E1 E A A1 e b L

αααα

3901071071 Page 9 of 10 Data Sheet Rev. 004 Dec. 2001

Page 10

Your Notes

TH71071

315/433MHz

ASK Transmitter / LO Source

Important Notice

Devices sold by Mele xis are covered by th e warranty and pate nt indemnification pr ovisions appearing in i ts Term of S ale. Melexis makes no warrant y, express, statutory, implied, or by description regarding the informatio n set forth herein or re garding the freedom of the described devices from patent infringement. Melexis res erves the ri ght to cha nge sp ecific ations and p rices at any time and without notice . The refor e, prio r to designing this product into a system, it is necessary t o check with Melexis for curr ent information. This product is intended for use in norm al commercial applications. A pplications requiring extended temperature range, unusual environmental requirements, or high reli ability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by Melexis for each application. The information furnis hed by Melexis is believed to be cor rect and accurate. How ever, Melexis shall not be liable to recipi ent or any third party for any damages, including b ut not limited to personal injury, pro perty damage, loss of p rofits, loss of use , interrupt of business or indirect, speci al incidental or consequential dama ges, of any kind, in connection wit h or arising out of the fu rnishing, per formance or u se of the techni cal data herei n. No obligati on or liability to recipient or any third party shall arise or flow out of Melexis’ rendering of technical or other services. © 2000 Melexis NV. All rights reserved.

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3901071071 Page 10 of 10 Data Sheet Rev. 004 Dec. 2001