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PDF MC33493 Data sheet ( Hoja de datos )
| Número de pieza | MC33493 | |
| Descripción | PLL tuned UHF Transmitter for Data Transfer Applications | |
| Fabricantes | Motorola Semiconductors | |
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Technical Data
TANGO3
MC33493/D
Rev. 1.6, 6/2002
PLL tuned UHF
Transmitter for Data
Transfer Applications
Freescale Semiconductor, Inc.
FEATURES
• Selectable frequency bands:
315-434MHz and 868-928MHz
• OOK and FSK modulation
• Adjustable output power range
• Fully integrated VCO
• Supply voltage range: 1.9-3.6V
• Very low standby current: 0.1nA @ TA=25°C
• Low supply voltage shutdown
• Data clock output for microcontroller
• Extended temperature range: -40°C to 125°C
• Low external component count
• Typical application compliant with ETSI standard
Figure 1: Simplified block diagram
PIN CONNECTIONS
DATACLK 1
DATA 2
BAND 3
GND 4
XTAL1 5
XTAL0 6
REXT 7
14 MODE
13 ENABLE
12 VCC
11 GNDRF
10 RFOUT
9 VCC
8 CFSK
Ordering Information
Device
Ambiant
Temperature Package
Range
MC33493
DTB
-40°C to
125°C
TSSOP14
This document contains information on a new product under development. Motorola
reserves the right to change or discontinue this product without notice.
For More Information On This Product,
Go to: www.freescale.com
© Motorola, Inc., 2002
1 page  
Freescale Semiconductor, Inc.
STATE MACHINE
Figure 3: State machine
Power ON
AND ENABLE=0
State 1
Standby mode
ENABLE=0
ENABLE=1
ENABLE=0
State 2
PLL out of lock-in range
No RF output
PLL in
PLL out of
lock-in range lock-in range
State 4
Shutdown mode
Vbattery < Vshutdown
State 3
Transmission mode
State 1:
The circuit is in standby mode and draws only a leakage current from the power supply.
State 2:
In this state, the PLL is out of the lock-in range. Therefore the RF output stage is switched off preventing RF
transmission. Data clock is available on pin DATACLK. Each time the device is enabled, the state machine
passes through this state.
State 3:
In this state, the PLL is within the lock-in range. If t<tPLL_lock_in then the PLL can still be in acquisition mode. If
t≥tPLL_lock_in, then the PLL is locked.
Data entered on pin DATA are output on pin RFOUT according to the modulation selected by the level applied on
pin MODE.
State 4:
When the supply voltage falls below the shutdown voltage threshold (VSDWN) the whole circuit is switched off.
Applying a low level on pin ENABLE is the only condition to get out of this state.
Figure 4 shows the waveforms of the main signals for a typical application cycle.
MOTOROLA
MC33493 Technical Data
For More Information On This Product,
Go to: www.freescale.com
5
5 Page 
Freescale Semiconductor, Inc.
RF OUTPUT SPECTRUM
Figure 5: RF spectrum at 434MHz frequency band displayed with a 5MHz span
Resolution
bandwidth:
100kHz
Resolution
bandwidth:
30kHz
Figure 6: RF spectrum at 434MHz frequency band displayed with a 50MHz span
MOTOROLA
MC33493 Technical Data
For More Information On This Product,
Go to: www.freescale.com
11
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| Páginas | Total 20 Páginas | |
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