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U3745BM Datasheet, PDF (26/29 Pages) ATMEL Corporation – UHF ASK RECEIVER IC
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Electrical Characteristics
All parameters refer to GND, VS = 5 V, Tamb = 25°C, f0 = 433.92 MHz and f0 = 315 MHz, unless otherwise specified. The
possible operating range refer to different circuit conditions: VS = 4.5 V to 5.5 V, Tamb = -40°C to +85°C
6.76438-Mhz Osc.
(Mode 1)
4.90625-Mhz Osc.
(Mode 0)
Variable Oscillator
Parameter
Test Condition
Symbol
Min.
Typ. Max. Min. Typ.
Max. Min.
Typ.
Max. Unit
Time for Bit
check
Average bit check
time while polling
BR_Range0
BR_Range1
BR_Range2
BR_Range3
Bit check time for a
valid input signal
fSig
NBitcheck = 0
NBitcheck = 3
NBitcheck = 6
NBitcheck = 9
Receiving Mode
TBitcheck
TBitcheck
Intermediate
frequency
MODE=0 (USA)
MODE=1 (Europe)
fIF
3/fSig
6/fSig
9/fSig
0.45
0.47
0.24
0.26
0.14
0.16
0.14
0.15
3.5/fSig
6.5/fSig
9.5/fSig
3/fSig
6/fSig
9/fSig
3.5/fSig
6.5/fSig
9.5/fSig
1.0
1.0
ms
ms
ms
ms
TXClk
ms
3.5/fSig ms
6.5/fSig ms
9.5/fSig ms
fXTO ´ 64 / 314
MHz
fXTO ´ 64 / 432.92
MHz
Baud rate
range
BR_Range0
BR_Range1
BR_Range2
BR_Range3
1.0
BR_Range
1.8
3.2
5.6
1.8 1.0
3.2 1.8
5.6 3.2
10.0 5.6
1.8
3.2
5.6
10.0
BR_Range0 ´ 2 ms / TClk
BR_Range1 ´ 2 ms / TClk
BR_Range2 ´ 2 ms / TClk
BR_Range3 ´ 2 ms / TClk
kBaud
kBaud
kBaud
kBaud
Minimum time
period
between
edges at
Pin DATA
(Figure 14)
BR_Range0
BR_Range1
BR_Range2
BR_Range3
TDATA_min
tmin1
tmin2
tmin1
tmin2
tmin1
tmin2
tmin1
149
182
75
91
37.3
45.5
18.6
tmin2
22.8
147
179
73
90
36.7
44.8
18.3
22.4
9 ´ TXClk
µs
11 ´ TXCl
µs
9 ´ TXClk
µs
11 ´ TXClk
µs
9 ´ TXClk
µs
11 ´ TXClk
9 ´ TXClk
11 ´ TXClk
µs
µs
µs
Maximum low
period at
DATA
(Figure 15)
BR_Range0
BR_Range1
BR_Range2
BR_Range3
TDATA_L_max
2169
1085
542
271
2136
1068
534
267
131 ´ TXClk
µs
131 ´ TXClk
µs
131 ´ TXClk
µs
131 ´ TXClk
µs
OFF
3.1
3.05
1.5 ´
µs
command at
Pin ENABLE
tDoze
TClk
(Figure 17)
Configuration of the Receiver
Frequency of
the reset
marker
(Figure 18)
fRM
117.9
119.8
---------------1-----------------
Hz
4096 ´ TCLK
26 U3745BM
4663A–RKE–06/03
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