T5744-TKS Atmel, T5744-TKS Datasheet - Page 5

• Manufacturer Part Number: T5744-TKS
• Description: RF Transceiver UHF ASK Receiver IC
• Manufacturer: Atmel

Specifications of T5744-TKS

• Operating Supply Voltage: 5 V
• Mounting Style: SMD/SMT
• Package / Case: SSO-20
• Minimum Operating Temperature: - 40 C
• Operating Frequency (max): 450000kHz
• Operating Temperature (min): -40C
• Operating Temperature (max): 105C
• Operating Temperature Classification: Industrial
• 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

Table 3-1.
Figure 3-2.
4521C–RKE–05/05
Conditions
f
f
300 MHz < f
365 MHz < f
RF
RF
= 315 MHz, MODE = 0
= 433.92 MHz, MODE = 1
RF
f
RF
IN
= 433.92 MHz
RF
RF
8.2p
Calculation of LO and IF Frequency
Input Matching Network with SAW Filter
< 365 MHz, MODE = 0
< 450 MHz, MODE = 1
C2
22p
C3
TOKO LL2012
F33NJ
L2
33n
A good practice when designing the network, is to start with power matching. From that starting
point, the values of the components can be varied to some extent to achieve the best sensitivity.
If a SAW is implemented into the input network a mirror frequency suppression of P
can be achieved. There are SAWs available that exhibit a notch at f = 2 MHz. These SAWs
work best for an intermediate frequency of IF = 1 MHz. The selectivity of the receiver is also
improved by using a SAW. In typical automotive applications, a SAW is used.
Figure 3-2
using a SAW.
input matching networks shown in
parameters given in the electrical characteristics.
L
25n
2
1
IN
IN_GND
8
9
C16
100p
CASE_GND
shows a typical input matching network for f
LNAGND
LNA_IN
3, 4 7, 8
B3555
T5744
27n
L3
Figure 3-3 on page 6
Local Oscillator Frequency
f
f
LO
LO
f
f
LO
OUT_GND
LO
TOKO LL2012
= 314 MHz
= 432.92 MHz
F27NJ
=
=
C17
8.2p
OUT
--------------------------- -
1
-------------------
1
+
+
f
RF
5
6
f
----------------- -
432.92
--------- -
314
RF
1
1
Figure 3-3 on page 6
RF
illustrates the input matching to 50 without a SAW. The
IN
f
RF
= 315 MHz
10p
C2
47p
C3
TOKO LL2012
F82NJ
82n
L2
Intermediate Frequency
f
f
IF
IF
L
25n
RF
2
1
= 1 MHz
= 1 MHz
f
are the reference networks for the
IF
f
IN
IN_GND
= 315 MHz and f
IF
=
=
----------------- -
432.92
8
9
C16
--------- -
314
100p
f
f
LO
LO
CASE_GND
LNAGND
LNA_IN
3, 4 7, 8
B3551
T5744
47n
L3
TOKO LL2012
OUT_GND
F47NJ
C17
22p
RF
OUT
= 433.92 MHz
5
6
T5744
Ref
= 40 dB
5