U4311B-FS Datasheet, PDF (12/13 Pages) ATMEL Corporation – Low-Current Superhet Remote Control Receiver

U4311B-FS
Application
The U4311B-FS is well-suited to implement UHF remote
control or data transmission systems, based on a low-
current superheterodyne receiver concept. SAW-devices
may be used in the transmitter’s as well as in the receiver
local oscillator. The front end should be a discrete circuit
application with low-current UHF transistors such as
S822T or S852T (Vishay Telefunken). The frequency of
the local oscillator can be determined either by coaxial
resonators or SAW devices. Due to the large
V_S
SAW-resonator, tolerance an IF bandwidth * and in a FM
system additionally the discriminator amplitude charac-
teristic (see figure 28) * of 300 kHz or higher is pro-
posed. As the circuit needs only 3.0 V supply voltage for
operation, the front end may be a stacked design in order
to achieve a total receiver current consumption of approx-
imately 1 mA. Figure 29 shows a principle receiver
concept diagram.
350 mA
350 mA
RF in
Data out
1 mA
Signal path
Power supply
Figure 29. Principle diagram of a UHF remote control receiver
Package Information
5.7
Package SSO20
5.3
Dimensions in mm
6.75
4.5
6.50
4.3
1.30
0.25
0.15
0.05
6.6
0.65
5.85
6.3
20
11
95 10137
0.15
1
12 (13)
technical drawings
according to DIN
specifications
10
13007
Rev. A3, 28-Sep-00