U3742BM Datasheet, PDF (24/32 Pages) ATMEL Corporation – UHF ASK/FSK RECEIVER

During programming, the LNA, LO, low-pass filter, IF-amplifier and the FSK/ASK
Manchester demodulator are disabled.
The programming start pulse t₁ initiates the programming of the configuration registers.
If bit 1 is set to '1', it represents the OFF-command to set the receiver back to polling
mode at the same time. For the length of the programming start pulse t₁, the following
convention should be considered:
• t₁(min) < t₁ < 1535 ´ T_Clk: [t₁(min) is the minimum specified value for the relevant
BR_Range]
Programming (respectively OFF-command) is initiated if the receiver is not in reset
mode. If the receiver is in reset mode, programming (respectively Off-command) is not
initiated, and the reset marker RM is still present at pin DATA.
This period is generally used to switch the receiver to polling mode. In a reset condition,
RM is not canceled by accident.
• t₁ > 5632 ´ T_Clk
Programming (respectively OFF-command) is initiated in any case. RM is canceled if
present.
This period is used if the connected microcontroller detected RM. If a configuration reg-
ister is programmed, this time period for t₁ can generally be used. Note that the
capacitive load at pin DATA is limited. The resulting time constant t together with an
optional external pull-up resistor may not be exceeded to ensure proper operation.
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameters
Symbol
Min.
Max.
Unit
Power dissipation
P_tot
Junction temperature
T_j
Storage temperature
T_stg
-55
Ambient temperature
T_amb
-40
Maximum input level, input matched to 50 W
P_{in_max}
450
150
+125
+105
10
mW
°C
°C
°C
dBm
Thermal Resistance
Parameters
Junction ambient
Symbol
R_thJA
Value
100
Unit
K/W
24 U3742BM
4735A–RKE–11/03