Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
SAW-based ASK/OOK Transmitter IC
Preliminary
PT4450
DESCRIPTION
PT4450 is a high performance ASK/OOK transmitter for the Remote Keyless Entry (RKE) systems.
It consists of a SAW oscillator, power amplifier, and one-shot circuit which control the SAW
oscillator and power amplifier.
FEATURES
•
•
•
•
•
•
•
•
Highly integrated ASK/OOK transmitter
High output power, 3V/+10dBm/18mA
Low supply voltage (2.2V to 3.6V operation range)
Low external component cost.
SAW-based oscillator, frequency range from 250MHz to 500MHz
On-chip one-shot circuit
50dB RF on/off ratio
Available in 6 pins, SOT-23 package
APPLICATIONS
•
•
•
•
•
•
Keyless entry systems
Remote control systems
Garage door openers
Alarm systems
Security systems
Wireless sensors
PT4450 PRE1.0
-1-
August, 2007
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
SAW-based ASK/OOK Transmitter IC
Preliminary
PT4450
BLOCK DIAGRAM
OSCIN
VDD
DIN
Regulator
One Shot
PA
Output
matching
network
OSCOUT
VSS
PAOUT
PT4450 PRE1.0
-2-
August, 2007
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
SAW-based ASK/OOK Transmitter IC
Preliminary
PT4450
PIN CONFIGURATION
PIN DESCRIPTION
Pin Name
OSCOUT
VSS
PAOUT
DIN
VDD
OSCIN
I/O
O
G
O
I
P
I
Description
Oscillator output
Ground connection
Power amplifier output
Data input, it will also be used to enable the chip
Power supply
Oscillator input
Pin No.
1
2
3
4
5
6
DIE PAD DIAGRAM
PT4450 PRE1.0
-3-
August, 2007
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
SAW-based ASK/OOK Transmitter IC
Preliminary
PT4450
ABSOLUTE MAXIMUM RATINGS
(V
SS
=0V)
Parameter
Supply voltage
Operating temperature
Storage temperature
Soldering temperature
Soldering time
Symbol
V
DD
Topr
Tstg
T
SLD
t
SLD
Rating
V
SS
-0.3 to V
SS
+6.0
-40 to +85
-65 to +150
255
10
Unit
V
℃
℃
℃
Sec.
RECOMMEND OPERATING CONDITIONS
(V
SS
=0V)
Parameter
Supply voltage range
Operating temperature
Symbol
V
DD
T
A
Rating
Min.
2.2
-40
Typ.
3.0
25
Max.
3.6
85
Unit
V
℃
PT4450 PRE1.0
-4-
August, 2007
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
SAW-based ASK/OOK Transmitter IC
Preliminary
PT4450
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, V
DD
=3.0V, V
SS
=0V, DIN=3.0V. Temp=27℃, f
RF
=434MHz)
Rating
Symbol
Condition
Parameter
Min. Typ. Max.
DC
Supply voltage
Operating current
(Note)
Standby current
RF
Frequency range
Power amplifier output power
(Note)
RF power on/off ratio
Phase noise
Harmonics (see Note)
Data Input and One Shot
Data rate
Start up time
One shot delay time
V
DD
I
DD
I
standby
f
RF
P
out
P
EXT
P
NOISE
P
HARM
D
RATE
T
ON
T
DELAY
DIN=High(CW mode);
P
OUT
=10dBm
DIN=Low; T
DELAY
>50ms
2.2
16
-
250
-
-
-
-
0.5
-
50
3.0
-
-
-
+10
50
-100
-40
2
-
-
3.6
18
1
Unit
V
mA
µA
10KHz offset
2x/3x f
RF
500
MHz
-
dBm
-
dB
-
dBc/Hz
-
dBc
50
200
-
Kbps
µs
ms
Note: Depend on power amplifier output matching.
PT4450 PRE1.0
-5-
August, 2007
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