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參數(shù)資料
| 型號： | ATA5744N-TKSY |
| 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： | LEAD FREE, SSO-20 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 316K |
| 代理商： | ATA5744N-TKSY |
6
4893A–RKE–11/05
ATA5744
Figure 3-3.
Input Matching Network without SAW Filter
Please note that for all coupling conditions (see Figure 3-2 on page 5 and Figure 3-3), the bond
wire inductivity of the LNA ground is compensated. C3 forms a series resonance circuit together
with the bond wire. L = 25 nH is a feed inductor to establish a DC path. Its value is not critical but
must be large enough not to detune the series resonance circuit. For cost reduction, this induc-
tor can be easily printed on the PCB. This configuration improves the sensitivity of the receiver
by about 1 dB to 2 dB.
4.
Analog Signal Processing
4.1
IF Amplifier
The signals coming from the RF front end are filtered by the fully integrated 4th-order IF filter.
The I F cent er f requency is f
IF = 1 M H z for applications where f RF = 315 MHz or
f
RF = 433.92 MHz is used. For other RF input frequencies, refer to Table 3-1 on page 5 to deter-
mine the center frequency.
The receiver ATA5744 employs an IF bandwidth of B
IF = 600 kHz and can be used together with
the U2741B in ASK mode.
4.2
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 DRRSSI = 60 dB. If the RSSI amplifier is
operated within its linear range, the best S/N ratio is maintained. 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 about 60 dB higher compared to the RF input sig-
nal at full sensitivity.
ATA5744
C3
15p
25n
100p
3.3p
TOKO LL2012
F22NJ
22n
8
9
RF
IN
f
RF = 433.92 MHz
LNAGND
LNA_IN
C3
33p
25n
100p
3.3p
TOKO LL2012
F39NJ
39n
8
9
f
RF = 315 MHz
LNAGND
LNA_IN
RF
IN
ATA5744
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