ATA5744N-TKQY 19 Atmel, ATA5744N-TKQY 19 Datasheet - Page 6
![RF Receiver RF DATA CONTROL RECEIVER](/photos/30/99/309924/sso20_sml.jpg)
ATA5744N-TKQY 19
Manufacturer Part Number
ATA5744N-TKQY 19
Description
RF Receiver RF DATA CONTROL RECEIVER
Manufacturer
Atmel
Type
Receiverr
Datasheet
1.ATA5744N-TKQY.pdf
(20 pages)
Specifications of ATA5744N-TKQY 19
Package / Case
SSO-20
Operating Frequency
449 MHz
Operating Supply Voltage
4.5 V to 5.5 V
Maximum Operating Temperature
+ 105 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Noise Figure
7 dB
Operating Frequency (max)
450000kHz
Operating Temperature (min)
-40C
Operating Temperature (max)
105C
Operating Temperature Classification
Industrial
Product Depth (mm)
4.4mm
Operating Supply Voltage (min)
4.5V
Operating Supply Voltage (typ)
5V
Operating Supply Voltage (max)
5.5V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Figure 3-3.
4. Analog Signal Processing
4.1
4.2
6
IF Amplifier
RSSI Amplifier
ATA5744
f
RF
Input Matching Network without SAW Filter
RF
IN
= 433.92 MHz
C3
15p
3.3p
Please note that for all coupling conditions (see
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.
The signals coming from the RF front end are filtered by the fully integrated 4th-order IF filter.
T h e I F c e n t e r f r e q u e n c y i s f
f
mine the center frequency.
The receiver ATA5744 employs an IF bandwidth of B
the U2741B in ASK mode.
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.
RF
22n
= 433.92 MHz is used. For other RF input frequencies, refer to
TOKO LL2012
25n
100p
F22NJ
8
9
LNAGND
LNA_IN
ATA5744
I F
= 1 M H z f o r a p p l i c a t i o n s w h e r e f
RF
f
IN
RF
= 315 MHz
Figure 3-2 on page 5
C3
33p
3.3p
IF
= 600 kHz and can be used together with
39n
TOKO LL2012
25n
100p
F39NJ
Table 3-1 on page 5
8
9
and
ATA5744
LNAGND
LNA_IN
Figure
R F
= 3 1 5 M H z o r
3-3), the bond
4893A–RKE–11/05
to deter-