ATA5746 ATMEL Corporation, ATA5746 Datasheet - Page 7

• Manufacturer Part Number: ATA5746
• Description: (ATA5745 / ATA5746) UHF ASK/FSK Receiver
• Manufacturer: ATMEL Corporation

Table 2-3.
Table 2-4.
Table 2-5.
2.3
4596A–RKE–05/06
RF Frequency
RF Frequency
433.92 MHz
433.92 MHz
2.4 Kbits/s
5.0 Kbits/s
9.6 Kbits/s
1.0 Kbit/s
315 MHz
315 MHz
Bit Rate
Sensitivity Versus Supply Voltage, Temperature and Frequency Offset
Measured Typical Sensitivity FSK, ±38 kHz, Manchester, BER = 10
Measured Typical Sensitivity 100% ASK, Manchester, BER = 10
Limits for Sensitivity Measurements
BR_Range_0
BR_Range_0
–108 dBm
–107 dBm
–114 dBm
–113 dBm
1.0 Kbit/s
1.0 Kbit/s
T
260 µs
110 µs
55 µs
27 µs
EE
Min
Conditions for the sensitivity measurement:
The given sensitivity values are valid for Manchester-modulated signals. For the sensitivity mea-
surement the distance from edge to edge must be evaluated. As can be seen in
page
To reach the specified sensitivity for the evaluation of T
following limits should be used (T
To calculate the behavior of a transmission system, it is important to know the reduction of the
sensitivity due to several influences. The most important are frequency offset due to crystal
oscillator (XTO) and crystal frequency (XTAL) errors, temperature and supply voltage depen-
dency of the noise figure, and IF-filter bandwidth of the receiver.
page 8
Figure 2-4
9.6 Kbits/s, ±38 kHz, Manchester versus the frequency offset between transmitter and receiver
at T
3.0V and 3.3V.
amb
24, in a Manchester-modulated data stream, the time segments T
= –40°C, +25°C, and +105°C and supply voltage VS = VS3V_AVCC = VS5V = 2.7V,
show the typical sensitivity at 315 MHz, ASK, 2.4 Kbits/s and 9.6 Kbits/s, Manchester,
BR_Range_0
BR_Range_0
and
2.5 Kbits/s
2.5 Kbits/s
–108 dBm
–107 dBm
–114 dBm
–113 dBm
T
500 µs
208 µs
100 µs
52 µs
EE
Figure 2-5 on page 9
Typ
BR_Range_1
BR_Range_1
–107 dBm
–106 dBm
–113 dBm
–112 dBm
5 Kbits/s
5 Kbits/s
T
790 µs
310 µs
155 µs
EE
78 µs
EE
ATA5745/ATA5746 [Preliminary]
Max
min, T
show a typical sensitivity at 315 MHz, FSK, 2.4 Kbits/s and
EE
max, 2 × T
BR_Range_2
BR_Range_2
2 × T
10 Kbits/s
10 Kbits/s
–105 dBm
–104 dBm
–111 dBm
–110 dBm
800 µs
320 µs
160 µs
81 µs
EE
–3
Min
–3
EE
EE
min, 2 × T
and 2 × T
BR_Range_3
2 × T
10 Kbits/s
–104 dBm
–103 dBm
1000 µs
Figure 2-2
416 µs
200 µs
104 µs
EE
EE
EE
EE
Typ
BR_Range_3
max).
in the data stream, the
10 Kbits/s
–109 dBm
–108 dBm
and 2 × T
and
BR_Range_3
2 × T
Figure 6-1 on
Figure 2-3 on
20 Kbits/s
–104 dBm
–103 dBm
1340 µs
EE
525 µs
260 µs
131 µs
EE
occur.
Max
7