User Manual

Page 4 USER MANUAL SMR-3X3 (SMR-313, SMR-323, SMR-333) Version 1.4
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SMR
PULSE SCHEME
In order to use the pulse capability of the SMR the following scheme is recommended to avoid out of band
emissions:
3.3V
> 3µs
0V
VCC
3.3V
> 1µs
0V
1µs
1µs
enable
INTERFACE
The sensor provides solder pads for SMT mounting.
PIN # DESCRIPTION IN/OUT COMMENT
1 d.n.c. do not connect
2 d.n.c. do not connect
3 IF1 output signal I(nphase)
4 IF2 output signal Q(adrature)
5 enable* input TX output power enable (active high)
6 GND input analog ground
7 V
cc
input supply voltage
8 d.n.c. do not connect
9 d.n.c. do not connect
10 GND input analog ground
*the enable has no influence on current consumption rather reduces the TX output power by about 30dB. To save
power use a pulse scheme as described on page 3.
enable pin off: 0 - 0.8V
enable pin on: 2 - 3.3V