T5743N-TG Atmel, T5743N-TG Datasheet - Page 5

• Manufacturer Part Number: T5743N-TG
• Manufacturer: Atmel

Specifications of T5743N-TG

• 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: Not Compliant

Please notify that for all coupling conditions (see
figures 5 and 6), 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 inductor can be easily
printed on the PCB. This configuration improves the
sensitivity of the receiver by about 1 dB to 2 dB.
Rev. A3, 17-Dec-01
f
RF
f
RF
RF
RF
IN
IN
= 433.92 MHz
= 433.92 MHz
8.2p
C2
15p
22p
C3
3.3p
TOKO LL2012
F33NJ
22n
33n
L2
TOKO LL2012
25n
25n
L
100p
F22NJ
2
1
IN
IN_GND
C16
8
9
100p
8
9
CASE_GND
LNAGND
LNA_IN
LNAGND
LNA_IN
B3555
Figure 6. Input matching network without SAW filter
3,4 7,8
T5743N
T5743N
Figure 5. Input matching network with SAW filter
27n
L3
OUT_GND
TOKO LL2012
F27NJ
C17
8.2p
OUT
5
6
Analog Signal Processing
IF Amplifier
The signals coming from the RF front end are filtered by
the fully integrated 4th-order IF filter. The IF center
frequency is f
f
RF input frequencies refer to table 1 to determine the
center frequency.
The receiver T5743N employs an IF bandwidth of
B
in FSK and ASK mode.
f
RF
RF
f
RF
RF
IF
RF
IN
IN
= 315 MHz or f
= 600 kHz and can be used together with the U2741B
= 315 MHz
= 315 MHz
10p
C2
33p
47p
C3
3.3p
TOKO LL2012
F82NJ
39n
82n
L2
IF
RF
= 1 MHz for applications where
TOKO LL2012
25n
25n
L
100p
F39NJ
= 433.92 MHz is used. For other
1
2
IN
IN_GND
C16
8
9
100p
8
9
CASE_GND
LNAGND
LNA_IN
LNAGND
LNA_IN
B3551
3,4 7,8
T5743N
T5743N
T5743N
47n
L3
OUT_GND
TOKO LL2012
F47NJ
C17
22p
OUT
5 (34)
5
6