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PDF PT4317 Data sheet ( Hoja de datos )
| Número de pieza | PT4317 | |
| Descripción | Low Power 315/433 MHz OOK/ASK Superheterodyne Receiver | |
| Fabricantes | PTC | |
| Logotipo |  |
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DESCRIPTION
The PT4317 is a low power single chip OOK/ASK
superheterodyne receiver for the 315MHz and
434MHz frequency bands that offers a high level of
integration and requires few external components.
The PT4317 consists of a low-noise amplifier (LNA),
down-conversion mixer, SAW-based local oscillator,
on-chip gm-C band-pass filter, intermediate frequency
(IF) limiting amplifier stage with received-signal-
strength indicator (RSSI), and analog baseband data
recovery circuitry (data filter, peak detector, and data
slicer). The PT4317 is available in a 16-pin SSOP
package.
APPLICATIONS
• Remote Keyless Entry (RKE) systems
• Remote control systems
• Garage door openers
• Alarm systems
• Security systems
• Wireless sensors
BLOCK DIAGRAM
Preliminary PT4317
Low Power 315/433MHz OOK/ASK
Superheterodyne Receiver with
SAW-Based Oscillator
FEATURES
• Low current consumption (4.7mA at VDD=5.0V)
• 2.4V to 5.5V supply voltage operation range
• Optimized for 315MHz or 434MHz ISM Band
• Saw-based oscillator with low frequency drift
• On-chip IF filter with better adjacent channel
rejection capability
• Power down mode with very low supply current
(<1μA)
• Low external parts count
• 16-pin SSOP package
Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
1 page  
PT4317
SAW Resonator Equivalent Circuit
Part Number
SRA316D800A01-SD11
MFSRA435.72A01-SD11
Center Frequency (MHz)
316.8
435.72
RS (Ω)
19
18
LS (μH)
119.06
85.38
CS (pF)
0.00213
0.00156
CL (pF)
2.4
1.7
For down-converting the RF signal to the IF frequency, a suitable SAW oscillation frequency must be chosen. In the
PT4317 chip, since the center frequency of the IF CSF is located at 1.8MHz, the following equation may be used to
calculate an appropriate SAW oscillator frequency:
SAW Oscillator Freq. = TX Freq. ± 1.8 MHz
In addition to a SAW resonator, the resonant circuit may also be achieved by an L-C tank circuit. A recommended circuit
for an L-C tank is shown in the following figure.
RF Frequency
(MHz)
315
433.92
C9 (pF)
100
100
C10 (pF)
10
5.6
Trimmer L2 (H)
2.5T
1.5T
LIMITER/RSSI
The limiter is an AC coupled, multi-stage amplifier with a cumulative gain of approximately 70dB that has a band-pass
characteristic centered near 1.8MHz. The –3dB bandwidth of the limiter is around 2MHz. The limiter circuit also
produces an RSSI voltage that is directly proportional to the input signal level with a slope of approximately 10mV/dB.
This signal is used by the succeeding baseband circuitry to demodulate ASK-modulated receive signals.
PRE1.0
5
April 2011
5 Page 
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Supply Voltage Range
Analog I/O Voltage
VDD5
–
Digital I/O Voltage
–
Operating Temperature Range
Topr
Storage Temperature Range
Tstg
Soldering Temperature
Soldering Time
TSLD
tSTG
Min.
-0.3
-0.3
-0.3
-40
-55
225
10
Max.
6
3
6
+85
+125
RECOMMENDED OPERATING CONDITIONS
(VSS=0V)
Parameter
Symbol
Min.
Value
Typ.
Max.
Supply Voltage Range
Operating Temperature
VDD5
TA
2.4 5.0 5.5
-40 27 85
PACKAGE THERMAL CHARACTERISTIC
Parameter
From Chip Conjunction Dissipation to
External Environment
From Chip Conjunction Dissipation to
Package Surface
Symbol
Rja
Rjc
Condition
TA=27°C
Min.
–
–
Typ.
37.15
1
Max.
–
1.8
PT4317
Unit
V
V
V
°C
°C
°C
S
Unit
V
°C
Unit
°C/W
PRE1.0
11
April 2011
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet PT4317.PDF ] | |
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