參數(shù)資料
型號(hào)： ATA5728P6-TKQY
廠商： ATMEL CORP
元件分類： 通信及網(wǎng)絡(luò)
英文描述： SPECIALTY TELECOM CIRCUIT, PDSO20
封裝： SSOP-20
文件頁(yè)數(shù)： 43/46頁(yè)
文件大?。?/td> 776K
代理商： ATA5728P6-TKQY
6
9106E–RKE–07/08
ATA5723/ATA5724/ATA5728
To determine f
LO, the construction of the IF filter must be considered. The nominal IF frequency
is f
IF = 950 kHz. To achieve a good accuracy of the filter corner frequencies, the filter is tuned by
the crystal frequency f
XTO. This means that there is a fixed relationship between fIF and fLO.
f
IF = fLO/318 for the 315 MHz band (ATA5723)
f
IF = fLO/438 for the 433.92 MHz band (ATA5724)
f
IF = fLO/915 for the 868.3 MHz band (ATA5728)
The relationship is designed to achieve the nominal IF frequency of:
f
IF = 987 kHz for the 315 MHz and BIF = 300 kHz (ATA5723)
f
IF = 987 kHz for the 433.92 MHz and BIF = 300 kHz (ATA5724)
f
IF = 947.8 kHz for the 868.3 MHz and BIF = 600 kHz (ATA5728)
The RF input either from an antenna or from an RF generator must be transformed to the RF
input pin LNA_IN. The input impedance of this pin is provided in the electrical parameters. The
parasitic board inductances and capacitances influence the input matching. The RF receiver
ATA5723/ATA5724/ATA5728 exhibits its highest sensitivity if the LNA is power matched.
Because of this, matching to a SAW filter, a 50
Ω or an antenna is easier.
Figure 14-1 on page 32 “Application Circuit” shows a typical input matching network for
f
RF = 315 MHz, fRF = 433.92 MHz or fRF = 868.3 MHz to 50Ω. The input matching network shown
in Table 14-2 on page 32 is the reference network for the parameters given in the electrical
characteristics.
4.
Analog Signal Processing
4.1
IF Filter
The signals coming from the RF front-end are filtered by the fully integrated 4th-order IF filter.
The IF center frequency is:
f
IF = 987 kHz for the 315 MHz and BIF = 300 kHz (ATA5723)
f
IF = 987 kHz for the 433.92 MHz and BIF = 300 kHz (ATA5724)
f
IF = 947.9 kHz for the 868.3 MHz and BIF = 600 kHz (ATA5728)
The nominal bandwidth is 300 kHz for ATA5723 and ATA5724 and 600 kHz for ATA5728.
4.2
Limiting RSSI Amplifier
The subsequent RSSI amplifier enhances the output signal of the IF amplifier before it is fed into
the demodulator. The dynamic range of this amplifier is
ΔR
RSSI = 60 dB. If the RSSI amplifier is
operated within its linear range, the best S/N ratio is maintained in ASK mode. If the dynamic
range is exceeded by the transmitter signal, the S/N ratio is defined by the ratio of the maximum
RSSI output voltage and the RSSI output voltage due to a disturber. The dynamic range of the
RSSI amplifier is exceeded if the RF input signal is approximately 60 dB higher compared to the
RF input signal at full sensitivity.
The S/N ratio is not affected by the dynamic range of the RSSI amplifier in FSK mode because
only the hard limited signal from a high-gain limiting amplifier is used by the demodulator.
The output voltage of the RSSI amplifier (VRSSI) is available at pin RSSI. Using the RSSI output
signal, the signal strength of different transmitters can be distinguished. The usable input power
range P
Ref is –100 dBm to –55 dBm.
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