Rainbow Electronics U3742BM - Manual (Page 24)

24
U3742BM
4735A–RKE–11/03
During programming, the LNA, LO, low-pass filter, IF-amplifier and the FSK/ASK
Manchester demodulator are disabled.
The programming start pulse t
1
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 t
1
, the following
convention should be considered:
• t
1
(min) < t
1
< 1535
´
T
Clk
: [t
1
(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.
• t
1
> 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 t
1
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
450 mW
Junction temperature T
j
150 ° C
Storage temperature T
stg
-55 +125 ° C
Ambient temperature T
amb
-40 +105 ° C
Maximum input level, input matched to 50 W P
in_max
10 dBm
Thermal Resistance
Parameters Symbol Value Unit
Junction ambient R
thJA
100 K/W